CN111694073A - Circumferential scanning imaging security check calibrating device - Google Patents

Abstract

The invention relates to a calibration device of a circular scanning imaging security inspection system, which comprises: 4 calibration antenna elements and 4 single pole double throw switches; 4 calibration antenna units, namely a B-surface receiving antenna calibration unit, an A-surface receiving antenna calibration unit, a B-surface transmitting antenna calibration unit and an A-surface transmitting antenna calibration unit; the phase errors of the transmitting array channel and the receiving array channel are obtained by adopting the mode that the B-surface receiving antenna calibration unit and the A-surface receiving antenna calibration unit receive the transmitting signals or the B-surface transmitting antenna calibration unit and the A-surface transmitting antenna calibration unit transmit the signals, the phase errors are extracted without carrying special equipment in the installation and debugging process, and the calibration can be completed after the security inspection system is started.

Description

Circumferential scanning imaging security check calibrating device

Technical Field

The invention relates to a circle scanning imaging security check calibration device, and belongs to the technical field of millimeter wave security check imaging.

Background

The currently known circular scanning imaging security inspection system devices all adopt a calibration method of a calibration plate or a calibration line. During the calibration process, a calibration plate or a calibration line needs to be placed on the central axis of the circular scanning imaging security inspection system. The installation and debugging are complex and time-consuming, and the installation and debugging equipment is not beneficial to public places such as airports and the like. Generally, in the using process, regular calibration and debugging are often needed, and the mode of using the calibration line of the calibration plate is not favorable for convenient calibration and debugging. Based on the reasons, the invention provides the calibration method and the calibration device which are higher in precision and more convenient and flexible in calibration.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the calibration device of the circular scanning imaging security inspection system is provided, the phase error extraction does not need to carry special calibration equipment in the installation and debugging process, and the calibration can be completed after the security inspection system is started.

The technical scheme of the invention is as follows: a circle scanning imaging security inspection system calibration device comprises: 4 antenna calibration units and 4 single pole double throw switches;

4 calibration antenna units, namely a B-surface receiving antenna calibration unit, an A-surface receiving antenna calibration unit, a B-surface transmitting antenna calibration unit and an A-surface transmitting antenna calibration unit;

a first single-pole double-throw switch is arranged between the input end of the receiver of the A-side transceiver module and the output ends of the A-side receiving antenna array and the B-side receiving antenna calibration unit, so that the input end of the receiver of the A-side transceiver module can be connected with the output end of the A-side receiving antenna array and can also be connected with the output end of the B-side receiving antenna calibration unit through a radio frequency cable;

a second single-pole double-throw switch is arranged between the output end of the transmitter of the A-side transceiver module and the input ends of the A-side transmitting antenna array and the B-side transmitting antenna calibration unit, so that the output end of the transmitter of the A-side transceiver module can be selectively connected with the input end of the A-side transmitting antenna array and can also be connected with the input end of the B-side transmitting antenna calibration unit through a radio frequency cable;

a third single-pole double-throw switch is arranged between the input end of the receiver of the B-side transceiver module and the output ends of the B-side receiving antenna array and the A-side receiving antenna calibration unit, so that the input end of the receiver of the B-side transceiver module can be connected with the output end of the B-side receiving antenna array and can also be connected with the output end of the A-side receiving antenna calibration unit through a radio frequency cable;

a fourth single-pole double-throw switch is arranged between the output end of the transmitter of the B-side transceiver module and the input ends of the B-side transmitting antenna array and the A-side transmitting antenna calibration unit, so that the output end of the transmitter of the B-side transceiver module can be selectively connected with the input end of the B-side transmitting antenna array and can also be connected with the input end of the A-side transmitting antenna calibration unit through a radio frequency cable;

transmitting antenna array B on B surface₁Side-mounted B-side transmitting antenna calibration unit B'₁Calibration Unit B 'for B-side transmitting antenna'₁The A-plane receiving antenna array A is formed by the A-plane receiving antenna array A and the transmitter of the A-plane receiving and transmitting module₂The calibration channel of (1);

receiving antenna array B on B side₂Side-mounted B-side receiving antenna calibration unit B'₂And a B-side receiving antenna calibration unit B'₂The A-surface transmitting antenna array A is formed by the A-surface transmitting antenna array A and the receiver of the A-surface receiving and transmitting module₁The calibration channel of (1);

transmitting antenna array A on A surface₁Side-mounted A-side transmitting antenna calibration unit A'₁A-side transmit antenna calibration unit A'₁The B-plane receiving antenna array B is formed by the transmitter of the B-plane transceiver module₂The calibration channel of (1);

receiving antenna array A on A surface₂Side-mounted A-side receiving antenna calibration unit A'₂Antenna calibration Unit A 'for A-side reception'₂Forming B with receiver of B-plane transceiver moduleSurface transmitting antenna array B₁The calibration channel of (1);

a-surface transmitting antenna array A₁A-side receiving antenna array A₂The first plane A and the second plane A are jointly arranged, and the A plane is marked; b-surface transmitting antenna array B₁B-side receiving antenna array B₂The two planes are jointly arranged on a second plane B, and the plane B is marked; the first plane A and the second plane B are oppositely arranged in parallel and can rotate along the rotating shaft under the drive of the servo motor; the rotating shaft is positioned between the first plane A and the second plane B and is parallel to the first plane A and the second plane B, and the distance between the rotating shaft and the first plane A is the same as that between the rotating shaft and the second plane B;

the A-side receiving antenna array has N_RA receiving antenna unit; the receiving period of each antenna unit is T; each receiving antenna unit can be respectively connected with a receiver of the A-surface transceiver module to form a channel as each receiving channel of the A surface;

the A-surface transmitting antenna array has N_TA plurality of transmitting antenna elements; the transmission period of each antenna unit is T; each transmitting antenna unit can be respectively connected with a transmitter of the A-surface transceiver module to form a channel as each transmitting channel of the A-surface;

the B-side receiving antenna array has N_RA receiving antenna unit; the receiving period of each antenna unit is T; each receiving antenna unit can be respectively connected with a receiver of the B-surface transceiver module to form a channel as each receiving channel of the B surface;

the B-side transmitting antenna array has N_TA plurality of transmitting antenna elements; the transmission period of each antenna unit is T; each transmitting antenna unit can be respectively connected with a transmitter of the B-surface transceiver module to form a channel as each transmitting channel of the B surface;

controlling a first single-pole double-throw switch to connect the output end of the A-side receiving antenna array with the input end of a receiver of the A-side receiving and transmitting module, and simultaneously controlling a second single-pole double-throw switch to calibrate a B-side transmitting antenna₁The input end is connected with the output end of the A-side transceiver module transmitter; controlling the A-surface transmitting antenna array not to work; the B-side transmitting antenna array does not work; a-surface transmitting antenna calibrationQuasi-cells do not work;

controlling the A-surface receiving antenna array to complete the electric scanning and receiving of each unit in the antenna array from top to bottom in sequence by taking T as a period, and simultaneously controlling the B-surface transmitting calibration antenna unit B₁' in the long-hair state with T as the period, finish N_RAfter the operation of each period T, each receiving channel of the A surface finishes receiving the B surface transmitting antenna calibration unit B₁' reception of transmitted signals, output N from receiver of A-plane Transceiver Module_RReceiving signals, respectively denoted as s_RAi，i＝1,2,….,N_R；s_RAiReceiving signals for the ith path;

to N_RThe method comprises the steps that a path of received signals are sampled respectively, and a plurality of sampling points are obtained after each path of received signals are sampled to form a path of discrete signals; fourier transform is carried out on each path of discrete signal to obtain each path of signal after Fourier transform, and the maximum value of the amplitude of each path of signal after Fourier transform and the position of a sampling point corresponding to the maximum value are determined_{RA_RANGEmaxi}And phase

Determining the distance between the B-surface transmitting calibration antenna unit and the A-surface receiving antenna array unit according to the position of the B-surface transmitting calibration antenna unit and the position of the ith unit in the A-surface receiving antenna array unit, thereby determining the phase compensation amount corresponding to each unit in the A-surface receiving antenna array; the phase compensation quantity corresponding to each unit in the A-surface receiving antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 1 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position RA _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 2 corresponding to each path of Fourier transformed signals_i；

According to each path after compensationPhase delta 1 of sampling point corresponding to maximum value of signal amplitude after Fourier transform_i(ii) a Phase compensation amount delta 2 corresponding to each path of Fourier transformed signal_iDetermining receiver output N of A-plane transceiver module_RCompensation RA for the phase of the received signal_compensate；

Secondly, controlling a second single-pole double-throw switch to connect the input end of the A-side transmitting antenna array with the output end of the A-side transceiver module transmitter, and simultaneously controlling a first single-pole double-throw switch to calibrate a B-side receiving antenna calibration unit B₂The output end of the antenna is connected with the input end of the A-side transceiver module receiver to control the B-side transmitting antenna array not to work; the B-surface transmitting antenna calibration unit does not work; the A-surface transmitting antenna calibration unit does not work;

controlling the A-surface transmitting antenna array to finish the transmission of each unit in the antenna array from top to bottom in sequence by taking T as a period, and simultaneously controlling the B-surface receiving antenna calibration unit B₂' in the state of long-time recovery by T, completing N_TB-side receiving antenna calibration unit B 'after operation of one period T'₂Completing the receiving of the transmitting signals of the units of the A-side transmitting antenna array, and calibrating the unit B 'from the B-side receiving antenna'₂Output N_TReceiving signals, respectively denoted as s_TAi，i＝1,2,….,N_T；s_TAiReceiving signals for the ith path;

to N_TThe method comprises the steps that a path of received signals are sampled respectively, and a plurality of sampling points are obtained after each path of received signals are sampled to form a path of discrete signals; fourier transform is carried out on each path of discrete signals to obtain each path of signals after Fourier transform, and the maximum value of the amplitude of each path of signals after Fourier transform and the sampling point position TA _ RANGE corresponding to the maximum value are determined_maxiAnd phase

Determining the distance between the B-surface receiving calibration antenna unit and the A-surface transmitting antenna array unit according to the position of the B-surface receiving antenna calibration unit and the position of the ith unit in the A-surface transmitting antenna array unit, thereby determining the phase compensation amount corresponding to each unit in the A-surface transmitting antenna array;the phase compensation quantity corresponding to each unit in the A-surface transmitting antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 3 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position TA _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 4 corresponding to each path of Fourier transformed signals_i；

According to the phase delta 3 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform after compensation_i(ii) a Phase compensation amount delta 4 corresponding to each path of Fourier transformed signal_iDetermining the compensation TA of the phase of the transmitted signal of the transmitter of the A-plane transceiver module_compensate；

Controlling a third single-pole double-throw switch to connect the output end of the B-side receiving antenna array with the input end of a B-side receiving and transmitting module receiver, and simultaneously controlling a fourth single-pole double-throw switch to connect the input end of the A-side transmitting antenna calibration unit with the output end of a B-side receiving and transmitting module transmitter; controlling the B-surface transmitting antenna array not to work; the A-side transmitting antenna array does not work; b, the transmitting antenna calibration unit works;

controlling the B-side receiving antenna array to sequentially complete the electric scanning reception of each unit in the antenna array from top to bottom by taking T as a period, and simultaneously controlling the A-side transmitting antenna calibration unit A'₁In the state of long hair with 8 mus as period, N is completed_RAfter 8 mu s periods of operation, each B-side receive channel completes calibration of the A-side transmit antenna calibration unit A'₁Reception of transmitted signals, output N from receiver of B-plane transceiver module_RReceiving signals, respectively denoted as s_RBi，i＝1,2,….,N_R；s_RBiReceiving signals for the ith path;

to N_RSampling the received signals, sampling each received signal to obtain multiple sampling points to form a discrete signal, and separating each channelFourier transformation is carried out on the scattered signals to obtain each path of signals after Fourier transformation, and the maximum value of the amplitude of each path of signals after Fourier transformation and the sampling point position RB _ RANGE corresponding to the maximum value are determined_maxiAnd phase

Determining the distance between the A-surface transmitting calibration unit and the B-surface receiving antenna array unit according to the position of the A-surface transmitting antenna calibration unit and the position of the ith unit in the B-surface receiving antenna array unit, thereby determining the phase compensation amount corresponding to each unit in the B-surface receiving antenna array; the phase compensation quantity corresponding to each unit in the B-surface receiving antenna array is used for the phase of the sampling point corresponding to the maximum value of the signal amplitude after Fourier transform of each path

Compensating to obtain the phase delta 5 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position RB _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation quantity delta 6 corresponding to each path of signals after Fourier transform_i；

According to the phase delta 5 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after the compensation and the Fourier transform_iPhase compensation amount Delta 6 corresponding to each Fourier transformed signal_iDetermining receiver output N of B-plane transceiver module_RCompensation RB for the phase of the received signal_compensate；

Finally, controlling a fourth single-pole double-throw switch to connect the input end of the B-face transmitting antenna array with the output end of the B-face transceiver module transmitter, and simultaneously controlling a third single-pole double-throw switch to connect the input end of the A-face receiving antenna calibration unit with the output end of the B-face transceiver module receiver to control the A-face transmitting antenna array not to work; the B-surface transmitting antenna calibration unit does not work; the A-surface transmitting antenna calibration unit does not work;

controlling the B-surface transmitting antenna array from top to bottom in sequence by taking T as a periodTransmitting of each unit in the antenna array is completed, and meanwhile, an A-side receiving antenna calibration unit A 'is controlled'₂In the state of taking T as cycle length to finish N_TAfter T periods of operation, A-side receiving antenna calibration unit A'₂Completing the receiving of the transmitting signals of the units of the B-side transmitting antenna array, and calibrating the unit A 'from the A-side receiving antenna'₂Output N_TReceiving signals, respectively denoted as s_TBi，i＝1,2,….,N_T；s_TBiReceiving signals for the ith path;

to N_TRespectively sampling the received signals, obtaining a plurality of sampling points after sampling each received signal to form a discrete signal, carrying out Fourier transform on each discrete signal to obtain signals after Fourier transform, and determining the maximum value of the amplitude of each signal after Fourier transform and the sampling point position TB _ RANGE corresponding to the maximum value_maxiAnd phase

Determining the distance between the A-surface receiving calibration antenna unit and the B-surface transmitting antenna array unit according to the position of the A-surface receiving antenna calibration unit and the position of the ith unit in the B-surface transmitting antenna array unit, thereby determining the phase compensation amount corresponding to each unit in the B-surface transmitting antenna array; the phase compensation quantity corresponding to each unit in the B-surface transmitting antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 7 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position TB _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 8 corresponding to each path of Fourier transformed signals_i；

According to the phase delta 7 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after the compensation and the Fourier transform_i(ii) a All channels of HeyuPhase compensation amount delta 8 corresponding to leaf-converted signal_iDetermining a compensation TB for the phase of the transmission signal of the transmitter of the B-plane transceiver module_compensate；

Outputting N of receiver of A-plane transceiver module_RCompensation RA for the phase of the received signal_compensateN of transmitter output of A-plane transceiver module_TCompensation TA of phase of channel transmitting signal_compensateReceiver output N of B-side transceiver module_RCompensation RB for the phase of the received signal_compensateAnd N of transmitter output of B-plane transceiver module_TCompensation quantity TB of road transmitting signal phase_compensateAnd storing.

Preferably, the receiver output N of the a-plane transceiver module_RCompensation RA for the phase of the received signal_compensate。

Preferably, the receiver output N of the a-plane transceiver module_RCompensation RA for the phase of the received signal_compensate＝Δ1_i*Δ2_i。

Preferably, N of transmitter output of the a-plane transceiver module_TCompensation TA of phase of channel transmitting signal_compensate＝Δ3_i*Δ4_i。

Preferably, the receiver output N of the B-plane transceiver module_RCompensation RB for the phase of the received signal_compensate＝Δ5_i*Δ6_i。

Preferably, N of transmitter output of B-plane transceiver module_TCompensation quantity TB of road transmitting signal phase_compensate＝Δ7_i*Δ8_i。

Preferably, T is 8. mu.s.

Preferably, the B-side transmitting antenna calibration unit B'₁The state of long hair with T as the cycle means that: b-plane transmitting calibration antenna unit at N_RThe signal is transmitted continuously for a period T.

Preferably, the B-side receiving antenna calibration unit B'₂The state of cycle contraction with T means: b-plane receiving calibration antenna unit at N_TThe signal is continuously received for T periods.

Preferably, A-side transmit antenna calibration unit A'₁The state of long hair with T as the cycle means that: a-plane transmitting calibration antenna unit is in N_RThe signal is transmitted continuously for a period T.

Preferably, the A-side receiving antenna calibration unit A 'is controlled'₂The state of cycle contraction with T means: a-plane receiving calibration antenna unit is in N_TThe signal is received continuously for a period T.

Compared with the prior art, the invention has the advantages that:

(1) the invention does not need to carry special calibration equipment in the installation and debugging process, so that the installation and debugging of the equipment in public places such as airports and the like are more convenient and faster, the maintenance and the debugging in the use process of the equipment are more favorably used, and the realization of normalized intermittent calibration operation is more favorably realized.

(2) The invention does not adopt the plate for auxiliary calibration, and the plate for calibration is required to have high flatness, uniformity and smoothness (namely, the microwave is required to reach any point of a plane, and the interaction with the point on the plane is equivalent), which puts high requirements on the production and processing of the plate. And the flat plate is easy to collide in the using process, so that a plurality of pits are formed on the surface. These all contribute to the accuracy of the calibration.

(3) By adopting the calibration method of the horn antenna, the transmitting antenna array signal to be calibrated and the receiving antenna array signal to be calibrated are enabled to interact with the horn antenna, so that the error brought by a calibration piece is reduced to the minimum, and the calibration precision is further improved.

(4) The invention preferably introduces a gradient descent algorithm into the determination process of the position coordinates of the antenna calibration unit, gives the accurate position of the antenna calibration unit, thereby calculating a more accurate phase compensation item, considers the installation errors of 4 calibration antenna units and further improves the calibration precision.

Drawings

FIG. 1 is a schematic diagram of a calibration device according to the present invention;

FIG. 2 is a schematic structural diagram of the calibration device of the present invention;

FIG. 3 is a flow chart of an extraction calibration method of the calibration device according to the present invention;

fig. 4 is a schematic diagram of the calibration method of the present invention, which is preferably implemented by eight single-pole double-throw switches and is shared by the calibration antenna unit and a middle unit of the original antenna array.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

The invention relates to a calibration device of a circular scanning imaging security inspection system, which comprises: 4 calibration antenna elements and 4 single pole double throw switches; 4 calibration antenna units, namely a B-surface receiving antenna calibration unit, an A-surface receiving antenna calibration unit, a B-surface transmitting antenna calibration unit and an A-surface transmitting antenna calibration unit; the phase errors of the transmitting array channel and the receiving array channel are obtained by adopting the mode that the B-surface receiving antenna calibration unit and the A-surface receiving antenna calibration unit receive the transmitting signals or the B-surface transmitting antenna calibration unit and the A-surface transmitting antenna calibration unit transmit the signals, the phase errors are extracted without carrying special equipment in the installation and debugging process, and the calibration can be completed after the security inspection system is started.

The circular scanning imaging security inspection system is mainly applied to public places such as airport security inspection halls, prison entrances, court entrances and the like. In these public places, particularly airports, often require 24 hours of operation, with occasional personnel needing to enter and exit the airport through security checks. The installation of the flat plate is stopped frequently, so that great inconvenience is brought to security inspection.

The security inspection device built in the security inspection imaging system provided by the invention is adopted to finish security inspection, and the calibration of the circular scanning imaging security inspection system can be finished more conveniently, rapidly and accurately.

The invention discloses a circular scanning imaging security check calibration device, which is arranged on a security check system, wherein the security check system is preferably as follows:

the circumference scanning imaging security inspection system comprises a servo motor, an A-surface transmitting and receiving antenna array, a B-surface transmitting and receiving antenna array, an A-surface transmitting antenna calibration unit, an A-surface receiving antenna calibration unit, a B-surface transmitting antenna calibration unit, a B-surface receiving antenna calibration unit, an A-surface transmitting and receiving module, a B-surface transmitting and receiving module, a signal processing module and a display module.

The circle scanning imaging security inspection system firstly controls the A-surface receiving and transmitting antenna array, the B-surface receiving and transmitting antenna array, the A-surface transmitting antenna calibration unit, the A-surface receiving antenna calibration unit, the B-surface transmitting antenna calibration unit and the B-surface receiving antenna calibration unit through a control module in the signal processing module to complete the receiving of calibration signals and the acquisition of calibration parameters. And then the A-surface receiving and transmitting antenna array and the B-surface receiving and transmitting antenna array are controlled to rotate around a rotating shaft as a whole through the servo motor, data acquisition is completed after one rotation, one-time security inspection imaging is completed through an imaging module in the signal processing module after calibration parameters are corrected, and the data is displayed on a display module.

As shown in fig. 1 and fig. 2, a circle scanning imaging security check calibration device based on a probe according to the present invention preferably includes: 4 antenna calibration units and 4 single pole double throw switches;

4 antenna calibration units, namely a B-surface receiving antenna calibration unit, an A-surface receiving antenna calibration unit, a B-surface transmitting antenna calibration unit and an A-surface transmitting antenna calibration unit;

a first single-pole double-throw switch is arranged between the input end (fixed end) of a receiver of the A-side transceiver module, the output end (switching end) of the A-side receiving antenna array and the output end (switching end) of the B-side receiving antenna calibration unit, so that the input end of the A-side transceiver module receiver can be connected with the output end of the A-side receiving antenna array and also can be connected with the output end of the B-side receiving antenna calibration unit through a radio frequency cable.

A second single-pole double-throw switch is arranged between the output end (fixed end) of the transmitter of the A-surface transceiver module and the input end (switching end) of the A-surface transmitting antenna array and the input end (switching end) of the B-surface transmitting antenna calibration unit, so that the output end of the transmitter of the A-surface transceiver module can be selectively connected with the input end of the A-surface transmitting antenna array and can also be connected with the input end of the B-surface transmitting antenna calibration unit through a radio frequency cable.

And a third single-pole double-throw switch is arranged between the input end (fixed end) of the receiver of the B-side transceiver module and the output ends (switching ends) of the B-side receiving antenna array and the A-side receiving antenna calibration unit, so that the input end of the receiver of the B-side transceiver module can be connected with the output end of the B-side receiving antenna array and can also be connected with the output end of the A-side receiving antenna calibration unit through a radio frequency cable.

And a fourth single-pole double-throw switch is arranged between the output end (fixed end) of the transmitter of the B-surface transceiver module and the input ends (switching ends) of the B-surface transmitting antenna array and the A-surface transmitting antenna calibration unit, so that the output end of the transmitter of the B-surface transceiver module can be selectively connected with the input end of the B-surface transmitting antenna array and can also be connected with the input end of the A-surface transmitting antenna calibration unit through a radio frequency cable.

Transmitting antenna array B on B surface₁Side-mounted B-side transmitting antenna calibration unit B'₁Calibration Unit B 'for B-side transmitting antenna'₁The A-plane receiving antenna array A is formed by the A-plane receiving antenna array A and the transmitter of the A-plane receiving and transmitting module₂The calibration channel of (1);

receiving antenna array B on B side₂Side-mounted B-side receiving antenna calibration unit B'₂And a B-side receiving antenna calibration unit B'₂The A-surface transmitting antenna array A is formed by the A-surface transmitting antenna array A and the receiver of the A-surface receiving and transmitting module₁The calibration channel of (1);

transmitting antenna array A on A surface₁Side-mounted A-side transmitting antenna calibration unit A'₁A-side transmit antenna calibration unit A'₁The B-plane receiving antenna array B is formed by the transmitter of the B-plane transceiver module₂The calibration channel of (1);

receiving antenna array A on A surface₂Side-mounted A-side receiving antenna calibration unit A'₂Antenna calibration Unit A 'for A-side reception'₂The B-plane transmitting antenna array B is formed by the B-plane transmitting antenna array B and the receiver of the B-plane transmitting-receiving module₁The calibration channel of (1);

a-surface transmitting antenna array A₁A-side receiving antenna array A₂Are jointly arranged on a first plane A; b-surface transmitting antenna array B₁B-side receiving antenna array B₂Are jointly arranged on a second plane B; the first plane A is parallel to the second plane BThe servo motor is arranged oppositely and can rotate along the rotating shaft under the driving of the servo motor; the rotating shaft is positioned between the first plane A and the second plane B and is parallel to the first plane A and the second plane B, and the rotating shaft is at the same distance with the first plane A and the second plane B.

The A-side receiving antenna array has N_RA receiving antenna unit; the receiving period of each antenna unit is 8 mu s; each receiving antenna unit can be respectively connected with a receiver of the A-surface transceiver module to form a channel as each receiving channel of the A surface;

the A-surface transmitting antenna array has N_TA plurality of transmitting antenna elements; the transmission period of each antenna unit is 8 mu s; each transmitting antenna unit can be respectively connected with a transmitter of the A-surface transceiver module to form a channel as each transmitting channel of the A-surface;

the B-side receiving antenna array has N_RA receiving antenna unit; the receiving period of each antenna unit is 8 mu s; each receiving antenna unit can be respectively connected with a receiver of the B-surface transceiver module to form a channel as each receiving channel of the B surface;

the B-side transmitting antenna array has N_TA plurality of transmitting antenna elements; the transmission period of each antenna unit is 8 mu s; each transmitting antenna unit can be respectively connected with a transmitter of the B-surface transceiver module to form a channel as each transmitting channel of the B-surface.

Firstly, a first single-pole double-throw switch is controlled to connect the output end of an A-side receiving antenna array with the input end of a receiver of an A-side receiving and transmitting module, and a second single-pole double-throw switch is controlled to calibrate a B-side transmitting antenna₁The input end is connected with the output end of the A-side transceiver module transmitter; controlling the A-surface transmitting antenna array not to work; the B-side transmitting antenna array does not work; and controlling the A-plane transmitting antenna calibration unit not to work.

Controlling the A-side receiving antenna array to sequentially complete the electrical scanning reception of each unit in the antenna array from top to bottom by taking 8 mu s as a period, and simultaneously controlling the B-side transmitting antenna calibration unit B'₁(as shown in FIG. 2) is in a state of long hair with a period of 8 μ s (long hair state, which means: B-surface transmitting antenna calibration unit)Continuously transmitting signal in 8 mus period) to finish N_RAfter 8 mu s periods of operation, each A-side receiving channel finishes receiving B-side transmitting antenna calibration unit B'₁Reception of transmitted signals, output N from the receiver of the A-plane Transceiver Module_RReceiving signals, respectively denoted as s_RAi，i＝1,2,….,N_R；s_RAiReceiving signals for the ith path;

to N_RThe method comprises the steps that a path of received signals are sampled respectively, and a plurality of sampling points are obtained after each path of received signals are sampled to form a path of discrete signals; (N)_RReceiving a signal to form N_RA path of discrete signals; ) Fourier transform is carried out on each path of discrete signals to obtain each path of signals after Fourier transform, and the maximum value of the amplitude of each path of signals after Fourier transform and the sampling point position RA _ RANGE corresponding to the maximum value are determined_maxiAnd phase

Determining the distance between the B-surface transmitting antenna calibration unit and the A-surface receiving antenna array unit according to the position of the B-surface transmitting antenna calibration unit and the position of the ith unit in the A-surface receiving antenna array unit; (thereby determining the position of each unit in the A-plane receiving antenna array unit is different), thereby determining the phase compensation amount corresponding to each unit in the A-plane receiving antenna array; the phase compensation quantity corresponding to each unit in the A-surface receiving antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 1 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position RA _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 2 corresponding to each path of Fourier transformed signals_i；

According to the phase of the sampling point corresponding to the maximum value of the amplitude of each path of signal after the compensation and the Fourier transformΔ1_i(ii) a Phase compensation amount delta 2 corresponding to each path of Fourier transformed signal_iDetermining receiver output N of A-plane transceiver module_RCompensation quantity delta 1 of received signal phase_i*Δ2_i。

Secondly, controlling a second single-pole double-throw switch to connect the input end of the A-side transmitting antenna array with the output end of the A-side transceiver module transmitter, and simultaneously controlling a first single-pole double-throw switch to calibrate a B-side receiving antenna unit B'₂The output end of the antenna is connected with the input end of the A-side transceiver module receiver to control the B-side transmitting antenna array not to work; controlling the A-surface transmitting antenna calibration unit not to work; controlling the calibration unit of the B-surface transmitting antenna not to work;

controlling the A-side transmitting antenna array to sequentially finish transmitting each unit in the antenna array from top to bottom by taking 8 mu s as a period, and simultaneously controlling a B-side receiving antenna calibration unit B'₂(as shown in FIG. 2) is in a state of long-time reception (long-time reception, which means that the B-plane emission calibration antenna unit is in N_TContinuously receiving signals for 8 mus period), N is completed_TB-side receive antenna calibration unit B 'after 8 mu s period of operation'₂Completing the receiving of the transmitting signals of the units of the A-side transmitting antenna array, and calibrating the unit B 'from the B-side receiving antenna'₂Output N_TReceiving signals, respectively denoted as s_TAi，i＝1,2,….,N_T；s_TAiReceiving signals for the ith path;

to N_TThe method comprises the steps that a path of received signals are sampled respectively, and a plurality of sampling points are obtained after each path of received signals are sampled to form a path of discrete signals; (N)_TReceiving a signal to form N_TA path of discrete signals; ) Fourier transform is carried out on each path of discrete signals to obtain each path of signals after Fourier transform, and the maximum value of the amplitude of each path of signals after Fourier transform and the sampling point position TA _ RANGE corresponding to the maximum value are determined_maxiAnd phase

According to the position of the B-surface receiving antenna calibration unit and the position of the ith unit in the A-surface transmitting antenna array unit,determining the distance between a B-surface receiving antenna calibration unit and an A-surface transmitting antenna array unit; (thereby determining the position of each unit in the A-surface receiving antenna array unit is different), thereby determining the phase compensation quantity corresponding to each unit in the A-surface transmitting antenna array; the phase compensation quantity corresponding to each unit in the A-surface transmitting antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 3 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position TA _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 4 corresponding to each path of Fourier transformed signals_i；

According to the phase delta 3 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform after compensation_i(ii) a Phase compensation amount delta 4 corresponding to each path of Fourier transformed signal_iDetermining the compensation quantity delta 3 of the phase of the transmission signal of the transmitter of the A-plane transceiver module_i*Δ4_i。

Controlling the third single-pole double-throw switch to connect the output end of the B-side receiving antenna array with the input end of the B-side receiving and transmitting module receiver, and simultaneously controlling the fourth single-pole double-throw switch to connect the input end of the A-side transmitting antenna calibration unit with the output end of the B-side receiving and transmitting module transmitter; controlling the B-surface transmitting antenna array not to work; the A-side transmitting antenna array does not work; the B-surface transmitting antenna calibration unit does not work;

controlling the B-side receiving antenna array to sequentially complete the electrical scanning and receiving of each unit in the antenna array from top to bottom by taking 8 mu s as a period, and simultaneously controlling the A-side transmitting calibration antenna unit A'₁(as shown in FIG. 2) is in a state of long hair with a period of 8 μ s (long hair state, which means that the A-plane emission calibration antenna unit is at N_RContinuously transmitting signals in 8 mus period) to finish N_RAfter 8 mu s periods of operation, each B-side receive channel completes calibration of the A-side transmit antenna calibration unit A'₁LaunchingIs received, and N is output from the receiver of the B-plane transceiver module_RReceiving signals, respectively denoted as s_RBi，i＝1,2,….,N_R；s_RBiReceiving signals for the ith path;

to N_RThe method comprises the steps that a path of received signals are sampled respectively, and a plurality of sampling points are obtained after each path of received signals are sampled to form a path of discrete signals; (N)_RReceiving a signal to form N_RA path of discrete signals; ) Fourier transform is carried out on each path of discrete signals to obtain each path of signals after Fourier transform, and the maximum value of the amplitude of each path of signals after Fourier transform and the sampling point position RB _ RANGE corresponding to the maximum value are determined_maxiAnd phase

Determining the distance between the A-surface transmitting calibration antenna unit and the B-surface receiving antenna array unit according to the position of the A-surface transmitting antenna calibration unit and the position of the ith unit in the B-surface receiving antenna array unit; (thereby determining the position of each unit in the B-plane receiving antenna array unit is different), thereby determining the phase compensation amount corresponding to each unit in the B-plane receiving antenna array; the phase compensation quantity corresponding to each unit in the B-surface receiving antenna array is used for the phase of the sampling point corresponding to the maximum value of the signal amplitude after Fourier transform of each path

Compensating to obtain the phase delta 5 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position RB _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation quantity delta 6 corresponding to each path of signals after Fourier transform_i；

According to the phase delta 5 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after the compensation and the Fourier transform_iPhase compensation amount Delta 6 corresponding to each Fourier transformed signal_iDetermining receiver output N of B-plane transceiver module_ROf the phase of the received signalOffset delta 5_i*Δ6_i。

Finally, controlling a fourth single-pole double-throw switch to connect the input end of the B-face transmitting antenna array with the output end of the B-face transceiver module transmitter, and simultaneously controlling a third single-pole double-throw switch to connect the output end of the A-face receiving antenna calibration unit with the input end of the B-face transceiver module receiver to control the A-face transmitting antenna array not to work; b, the transmitting antenna array works; the A-surface transmitting antenna calibration unit does not work; the B-surface transmitting antenna calibration unit does not work;

controlling the B-surface transmitting antenna array to finish the transmission of each unit in the antenna array from top to bottom in sequence by taking 8 mu s as a period, and simultaneously controlling the A-surface receiving antenna calibration unit A₂' (as shown in FIG. 2) in the state of long-time reception at 8 μ s (long-time reception means that the A-plane transmitting calibration antenna unit continuously receives signals in 8 μ s period), N is completed_TAfter an operation for a period of 8 mus,

a-side receiving antenna calibration unit A'₂Completing the receiving of the transmitting signals of the units of the B-side transmitting antenna array, and calibrating the unit A 'from the A-side receiving antenna'₂Output N_TReceiving signals, respectively denoted as s_TBi，i＝1,2,….,N_T；s_TBiReceiving signals for the ith path;

to N_TThe method comprises the steps that a path of received signals are sampled respectively, and a plurality of sampling points are obtained after each path of received signals are sampled to form a path of discrete signals; (N)_TReceiving a signal to form N_TA path of discrete signals; ) Fourier transform is carried out on each path of discrete signals to obtain each path of signals after Fourier transform, and the maximum value of the amplitude of each path of signals after Fourier transform and the sampling point position TB _ RANGE corresponding to the maximum value are determined_maxiAnd phase

Determining the distance between the A-surface receiving antenna calibration unit and the B-surface transmitting antenna array unit according to the position of the A-surface receiving antenna calibration unit and the position of the ith unit in the B-surface transmitting antenna array unit; (thereby determining the different positions of the elements in the B-plane receive antenna array elements),thus determining the phase compensation quantity corresponding to each unit in the B-surface transmitting antenna array; the phase compensation quantity corresponding to each unit in the B-surface transmitting antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 7 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position TB _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 8 corresponding to each path of Fourier transformed signals_i；

According to the phase delta 7 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after the compensation and the Fourier transform_i(ii) a Phase compensation amount delta 8 corresponding to each path of Fourier transformed signal_iDetermining the compensation quantity Delta 7 of the phase of the transmission signal of the transmitter of the B-plane transceiver module_i*Δ8_i。

Outputting N of receiver of A-plane transceiver module_RCompensation RA for the phase of the received signal_compensateN of transmitter output of A-plane transceiver module_TCompensation TA of phase of channel transmitting signal_compensateReceiver output N of B-side transceiver module_RCompensation RB for the phase of the received signal_compensateAnd N of transmitter output of B-plane transceiver module_TCompensation quantity TB of road transmitting signal phase_compensateThe storage is carried out, the basic function of the calibration device of the circular scanning imaging security inspection system is realized, and the precision of the calibration data is improved. A flow chart for extracting calibration parameters is shown in figure 3,

in the circular scanning imaging security check calibration device, the receiver output N of the A-surface transceiver module can be further stored_RCompensation RA for the phase of the received signal_compensateN of transmitter output of A-plane transceiver module_TCompensation TA of phase of channel transmitting signal_compensateReceiver output N of B-side transceiver module_RCompensation RB for the phase of the received signal_compensateAnd N of transmitter output of B-plane transceiver module_TCompensation quantity TB of road transmitting signal phase_compensateThe preferred embodiment of the calibration is as follows:

firstly, controlling a security inspection imaging system to work in an imaging mode, namely controlling a first single-pole double-throw switch to connect the output end of an A-side receiving antenna array with the input end of a receiver of an A-side transceiver module, and simultaneously controlling a second single-pole double-throw switch to connect the input end of an A-side transmitting antenna array with the output end of a transmitter of the A-side transceiver module; simultaneously controlling a third single-pole double-throw switch to connect the output end of the B-face receiving antenna array with the input end of a receiver of the B-face receiving and transmitting module, and simultaneously controlling a fourth single-pole double-throw switch to connect the input end of the B-face transmitting antenna array with the output end of a transmitter of the B-face receiving and transmitting module;

when a person to be detected enters between a first plane A and a second plane B, the rotating shaft is controlled to rotate for N degrees (the preferable value range of N degrees is 90-120 degrees), each unit in the A-plane transmitting antenna array finishes signal transmission from top to bottom for each rotating angle, the person to be detected is scanned, after the person to be detected is reflected, each unit in the A-plane receiving antenna array finishes signal reception from top to bottom and is sent to the input end of the receiver of the A-plane transceiver module, and the output end of the receiver of the A-plane transceiver module outputs N x N of the A-plane_RAn echo signal; by using a 1_i*Δ2_iAnd Δ 3_i*Δ4_iFor face A N_RPhase compensation is carried out on the echo signals to obtain echo signals after A-surface calibration is finished; the inversion of the image of the detected person is completed through a wave number domain imaging algorithm, so that the coherence of signals is further improved, and the definition and the focusing effect of the image are further improved.

Aiming at each rotation angle, each unit in the B-surface transmitting antenna array finishes signal transmission from top to bottom, a detected person is scanned, after the signal is reflected by the detected person, each unit in the B-surface receiving antenna array finishes signal reception from top to bottom and is sent to the input end of a receiver of the B-surface transceiver module, and the output end of the receiver of the B-surface transceiver module outputs the N of the B surface_RAn echo signal; by using a.DELTA.5_i*Δ6_iAnd Δ 7_i*Δ8_iFor face B N_RPhase compensation is carried out on the echo signals to obtain B-surface echo signals after calibration, inversion of the detected person image is completed through a wave number domain imaging algorithm, and the coherence of the signals is further improved so that the definition and the focusing effect of the image are improved.

The preferred embodiment (example 1) is: establishing an oxyz coordinate system, wherein the original point is the center of the A-surface receiving antenna array, the arrangement direction of receiving antenna units in the A-surface receiving antenna array is the y-axis direction, the X-axis is orthogonal to the y-axis, and the X-axis direction is the direction of the center pointing to the rotating shaft of the A-surface receiving antenna array; determining the Z axis by a right hand rule; the Z axis is positioned in a first plane A;

the position coordinate of the ith unit in the A-plane receiving antenna array in the oxyz coordinate system is assumed to be (R)_Axi,R_Ayi,R_Azi),i＝1,2,….,N_R；

R_AxiThe X-axis coordinate of the ith unit in the A-plane receiving antenna array unit in an oxyz coordinate system is represented; r_AyiThe y-axis coordinate of the ith unit in the A-plane receiving antenna array unit in an oxyz coordinate system is represented; r_AziThe z-axis coordinate of the ith unit in the A-plane receiving antenna array unit in an oxyz coordinate system is represented;

position B 'of B-side emission calibration antenna unit in oxy z coordinate system'₁Is (T)_Bx',T_By',T_Bz')；T_Bx'Representing x-axis coordinates of the B-plane transmitting calibration antenna unit in an oxyz coordinate system; t is_By'Representing the y-axis coordinate of the B-plane transmitting calibration antenna unit in an oxyz coordinate system; t is_Bz'Representing the z-axis coordinate of the B-plane emission calibration antenna unit in an oxyz coordinate system;

then under the oxyz coordinate system, the distance R between the position of the ith unit in the A-plane receiving antenna array and the position of the B-plane transmitting calibration antenna unit₁Expressed as follows:

the receiver output N of the a-plane transceiver module_RFirst phase compensation of received signal phaseThe item is

Wherein k is_cThe system center wavenumber.

Receiver output N of A-plane transceiver module_RThe second phase compensation term of the phase of the received signal is

Wherein_fIs the operating frequency of the system.

Receiver output N of A-plane transceiver module_RCompensation RA for the phase of the received signal_compensate

RA_compensate＝Δ1_i×Δ2_i；

Suppose the position coordinate of the ith unit in the A-plane transmitting antenna array in the oxyz coordinate system is (T)_Axi,T_Ayi,T_Azi),i＝1,2,….,N_T；

T_AxiThe X-axis coordinate of the ith unit in the A-plane receiving antenna array unit in an oxyz coordinate system is represented; t is_AyiThe y-axis coordinate of the ith unit in the A-plane receiving antenna array unit in an oxyz coordinate system is represented; t is_AziThe z-axis coordinate of the ith unit in the A-plane receiving antenna array unit in an oxyz coordinate system is represented;

position B 'of B-side receiving calibration antenna unit in oxyz coordinate system'₁Is (R)_Bx',R_By',R_Bz')；

R_Bx'Representing the x-axis coordinate of the B-plane receiving calibration antenna unit in an oxyz coordinate system; r_By'Representing the y-axis coordinate of the B-plane receiving calibration antenna unit in an oxyz coordinate system; r_Bz'The z-axis coordinate of the B-plane receiving calibration antenna unit under an oxyz coordinate system is represented;

then under the oxyz coordinate system, the distance R between the position of the ith unit in the A-plane transmitting antenna array and the position of the B-plane receiving calibration antenna unit₂Expressed as follows:

the transmitter output N of the a-plane transceiver module_TThe first phase compensation term of the phase of the received signal is

Wherein k is_cThe system center wavenumber.

Receiver output N of A-plane transceiver module_TThe second phase compensation term of the phase of the received signal is

Wherein_fIs the operating frequency of the system.

Transmitter output N of a-plane transceiver module_TCompensation TA of the phase of the received signal_compensate

TA_compensate＝Δ3_i×Δ4_i；

The position coordinate of the ith unit in the B-surface receiving antenna array in an oxyz coordinate system is assumed to be (R)_Bxi,R_Byi,R_Bzi),i＝1,2,….,N_R；

R_BxiThe X-axis coordinate of the ith unit in the B-plane receiving antenna array unit in an oxyz coordinate system is represented; r_ByiThe y-axis coordinate of the ith unit in the B-plane receiving antenna array unit in an oxyz coordinate system is represented; r_BziThe z-axis coordinate of the ith unit in the B-plane receiving antenna array unit in an oxyz coordinate system is represented;

position A 'of A-side emission calibration antenna unit in oxy z coordinate system'₁Is (T)_Ax',T_Ay',T_Az')；

T_Ax'Representing the x-axis coordinate of the A-surface emission calibration antenna unit in an oxyz coordinate system; t is_Ay'Representing the y-axis coordinate of the A-surface emission calibration antenna unit in an oxyz coordinate system; t is_Az'Representing the z-axis coordinate of the A-surface emission calibration antenna unit in an oxyz coordinate system;

then under the oxyz coordinate system, the distance R between the position of the ith unit in the B-surface receiving antenna array and the position of the A-surface transmitting calibration antenna unit₃Expressed as follows:

the receiver output N of the B-plane transceiver module_RThe first phase compensation term of the phase of the received signal is

Wherein k is_cThe system center wavenumber.

Receiver output N of B-plane transceiver module_RThe second phase compensation term of the phase of the received signal is

Wherein_fIs the operating frequency of the system.

Receiver output N of B-plane transceiver module_RCompensation RB for the phase of the received signal_compensate

RB_compensate＝Δ5_i×Δ6_i；

Suppose the position coordinate of the ith unit in the B-surface transmitting antenna array in the oxyz coordinate system is (T)_Bxi,T_Byi,T_Bzi),i＝1,2,….,N_T；

T_BxiThe X-axis coordinate of the ith unit in the B-plane receiving antenna array unit in an oxyz coordinate system is represented; t is_ByiThe y-axis coordinate of the ith unit in the B-plane receiving antenna array unit in an oxyz coordinate system is represented; t is_BziThe z-axis coordinate of the ith unit in the B-plane receiving antenna array unit in an oxyz coordinate system is represented;

position A 'of A-side receiving calibration antenna unit in oxyz coordinate system'₂Is (R)_Ax',R_Ay',R_Az')；

R_Ax'Representing the x-axis coordinate of the A-surface receiving calibration antenna unit in an oxyz coordinate system; r_Ay'Representing the y-axis coordinate of the A-surface receiving calibration antenna unit in an oxyz coordinate system; r_Az'The z-axis coordinate of the A-plane receiving calibration antenna unit under an oxyz coordinate system is represented;

then the ith single in the B-plane transmitting antenna array under the oxyz coordinate systemDistance R between element position and A-plane receiving calibration antenna unit position₄Expressed as follows:

the transmitter output N of the B-plane transceiver module_TThe first phase compensation term of the phase of the received signal is

Wherein k is_cThe system center wavenumber.

Receiver output N of A-plane transceiver module_TThe second phase compensation term of the phase of the received signal is

Wherein_fIs the operating frequency of the system.

Transmitter output N of a-plane transceiver module_TCompensation quantity TB of received signal phase_compensate

TB_compensate＝Δ7_i×Δ8_i；

As shown in fig. 3, as described above, the acquisition of calibration data of the a-plane receiving channel is completed respectively; completing the extraction and storage of calibration parameters of the A-plane receiving channel; completing the acquisition of calibration data of the A-surface emission channel; finishing the extraction and storage of calibration parameters of the A-surface emission channel; completing the acquisition of calibration data of a B-side receiving channel; completing the extraction and storage of calibration parameters of a B-plane receiving channel; completing the acquisition of calibration data of a B-surface emission channel; finishing the extraction and storage of calibration parameters of the B-surface emission channel; and finishing the extraction of the channel inconsistency parameters.

Controlling the security inspection system to work in an imaging mode, and respectively obtaining the A surface and the B surface N x N of the inspected person_RAn echo signal; by RA_compensateAnd TA_compensateFor face A N_RPhase compensation is carried out on the echo signals to obtain calibrated A-plane echo signals, inversion of the image of the detected person is completed through a wave number domain imaging algorithm, the coherence of the signals is further improved, and the image quality is further improvedSharpness and focusing effect. Simultaneous adoption of RB_compensateAnd TB_compensateFor face B N_RPhase compensation is carried out on the echo signals to obtain B-surface echo signals after calibration, inversion of the detected person image is completed through a wave number domain imaging algorithm, and the coherence of the signals is further improved so that the definition and the focusing effect of the image are improved.

The further preferred scheme is as follows: as shown in fig. 4, the calibration is done using eight single pole double throw switches and the calibration antenna element is common to the middle of the original antenna array. One transmitting unit at the middle position of the A-side transmitting array serves as an A-side transmitting antenna calibration unit A'₁One receiving unit at the middle position of the A-side receiving array is used as an A-side receiving antenna calibration unit A'₂One transmitting unit at the middle position of the B-side transmitting array serves as a B-side transmitting antenna calibration unit B'₁And one receiving unit at the middle position of the B-side receiving array is used as a B-side receiving antenna calibration unit B'₂；

Similarly, A-side transmitting antenna calibration unit A'₁Antenna calibration Unit A 'for A-side reception'₂Calibration Unit B 'for B-side transmitting antenna'₁And a B-side receiving antenna calibration unit B'₂The system is respectively connected with an A-surface receiving and transmitting antenna array, a B-surface receiving and transmitting antenna array, an A-surface transmitting antenna calibration unit, an A-surface receiving antenna calibration unit, a B-surface transmitting antenna calibration unit and a B-surface receiving antenna calibration unit in a security inspection system through a plurality of single-pole double-throw switches, and then a signal s for extracting calibration parameters of the A-surface receiving antenna array is obtained_RAi，i＝1,2,….,N_R(ii) a Signal s for extracting calibration parameters of A-plane transmitting antenna array_TAi，i＝1,2,….,N_T(ii) a Signal s for extracting calibration parameters of B-plane receiving antenna array_RBi，i＝1,2,….,N_R(ii) a Signal s for extracting calibration parameters of B-surface transmitting antenna array_TBi，i＝1,2,….,N_T. Otherwise, the same procedure as in example 1 was followed.

The invention does not need to carry special calibration equipment in the installation and debugging process, so that the installation and debugging of the equipment in public places such as airports and the like are more convenient and faster, the maintenance and the debugging in the use process of the equipment are more favorably used, and the realization of normalized intermittent calibration operation is more favorably realized.

The invention does not adopt a panel for auxiliary calibration, and the panel for calibration is required to have high flatness, uniformity and smoothness (namely, the microwave is required to reach any point of the plane, the interaction between the microwave and the point on the plane is equivalent, which puts high requirements on the production and processing of the panel.

The invention introduces the gradient descent algorithm into the determination process of the position coordinates of the antenna calibration unit and gives the accurate position of the antenna calibration unit, thereby calculating a more accurate phase compensation item and further improving the calibration precision.

The invention realizes the further proposal of improving the calibration precision: the absolute position of the calibration antenna is generally determined by means of optical scanning and the like, and the method has the disadvantages of needing a special instrument, being complex to operate, having slow measuring speed and being not suitable for application in public places. The invention solves the accurate position of the calibration antenna through the gradient descent algorithm, so that the position measurement is more accurate and more convenient. The specific method for solving and calibrating the accurate position of the antenna unit by the gradient descent method is as follows:

taking the determination of the position coordinates of the B-plane transmitting antenna calibration unit as an example:

first, an objective function TAR is determined_RA：

Wherein delay₁The internal delay of the system is also because the A-plane receiving antenna array is a column vector, R_Axi＝R_Ax0，R_Azi＝R_Az0，R_Ax0And R_Az0Is a constant. The above formula is rewritten as:

for T in the above formula_Bx'、T_By'、T_Bz'And delay₁The deviation is calculated as follows:

T′_Bx'＝αT_Bx'

T′_By'＝αT_By'

T′_Bz'＝αT_Bz'

delay′＝αdelay₁

α in the above formula is an infinitesimal quantity, T'_Bx'、T′_By'、T′_Bz'And delay'₁And calibrating the unit coordinates for the updated B-plane transmitting antenna. The partial derivation operation is repeated NN times, NN is more than or equal to 1000 times, and therefore one optimal solution, T'_Bx'、T′_By'、T′_Bz'And delay'₁. Prepared from T'_Bx'、T′_By'、T′_Bz'And the process of extracting the calibration parameters of the A-surface receiving antenna array is carried in, so that more accurate calibration parameters of the A-surface receiving antenna array can be obtained.

The position coordinates of the B-plane receiving antenna calibration unit can be obtained in the same way:

first, an objective function TAR is determined_TA：

Wherein delay₂The internal delay of the system is realized, and T is realized because the A-plane transmitting antenna array is a column vector_Axi＝T_Ax0，T_Azi＝T_Az0，T_Ax0And T_Az0Is a constant. The above formula is rewritten as:

for R in the above formula_Bx'、R_By'、R_Bz'And delay₂The deviation is calculated as follows:

R′_Bx'＝αR_Bx'

R′_By'＝αR_By'

R′_Bz'＝αR_Bz'

delay′₂＝αdelay₂

α in the above formula is an infinitesimal quantity, R'_Bx'、R′_By'、R′_Bz'And delay'₂The cell coordinates are calibrated for the updated B-plane receive antenna. The partial derivative operation is repeated NN times, NN is not less than 1000 times, therebyObtaining one of the optimal solutions, R'_Bx'、R′_By'、R′_Bz'And delay'₂. R'_Bx'、R′_By'、R′_Bz'And the process of extracting the calibration parameters of the A-surface transmitting antenna array is carried in, so that more accurate calibration parameters of the A-surface transmitting antenna array can be obtained.

The position coordinates of the A-plane transmitting antenna calibration unit can be obtained by the same method:

first, an objective function TAR is determined_RB：

Wherein delay₃The internal delay of the system is determined, and R is determined because the B-plane receiving antenna array is a column vector_Bxi＝R_Bx0，R_Bzi＝R_Bz0，R_Bx0And R_Bz0Is a constant. The above formula is rewritten as:

for T in the above formula_Ax'、T_Ay'、T_Az'And delay₃The deviation is calculated as follows:

T′_Ax'＝αT_Ax'

T′_Ay'＝αT_Ay'

T′_Az'＝αT_Az'

delay′＝αdelay₃

α in the above formula is an infinitesimal quantity, T'_Ax'、T′_Ay'、T′_Az'And delay'₃And calibrating the unit coordinates for the updated A-plane transmitting antenna. The partial derivation operation is repeated NN times, NN is more than or equal to 1000 times, and therefore one optimal solution, T'_Ax'、T′_Ay'、T′_Az'And delay'₃. Prepared from T'_Ax'、T′_Ay'、T′_Az'And bringing the calibration parameter extraction process of the B-side receiving antenna array into the process, thereby obtaining more accurate calibration parameters of the B-side receiving antenna array.

The position coordinates of the A-plane receiving antenna calibration unit can be obtained in the same way:

first, an objective function TAR is determined_TB：

Wherein delay₄Is the internal delay of the system, and because the B-plane transmitting antenna array is a column vector, T is_Bxi＝T_Bx0，T_Bzi＝T_Bz0，T_Bx0And T_Bz0Is a constant. The above formula is rewritten as:

for R in the above formula_Ax'、R_Ay'、R_Az'And delay₄The deviation is calculated as follows:

R′_Ax'＝αR_Ax'

R′_Ay'＝αR_Ay'

R′_Az'＝αR_Az'

delay′₄＝αdelay₄

α in the above formula is an infinitesimal quantity, R'_Ax'、R′_Ay'、R′_Az'And delay'₄The updated calibration antenna coordinates. The partial derivation operation is repeated NN times, NN is more than or equal to 1000 times, and therefore one optimal solution, R'_Ax'、R′_Ay'、R′_Az'And delay'₄. R'_Ax'、R′_Ay'、R′_Az'And bringing the calibration parameter extraction process of the B-surface transmitting antenna array into the process, thereby obtaining more accurate calibration parameters of the B-surface transmitting antenna array.

The calibration parameters were used in the same manner as in example 1.

The invention does not need to carry special calibration equipment in the installation and debugging process, so that the installation and debugging of the equipment in public places such as airports and the like are more convenient and faster, the maintenance and the debugging in the use process of the equipment are more favorably used, and the realization of normalized intermittent calibration operation is more favorably realized.

The invention does not adopt the plate for auxiliary calibration, and the plate for calibration is required to have high flatness, uniformity and smoothness (namely, the microwave is required to reach any point of a plane, and the interaction with the point on the plane is equivalent), which puts high requirements on the production and processing of the plate. And the flat plate is easy to collide in the using process, so that a plurality of pits are formed on the surface. These all contribute to the accuracy of the calibration.

According to the method, the transmitting antenna array signal to be calibrated and the receiving antenna array signal to be calibrated are enabled to interact with the horn antenna by adopting a calibration method of the horn antenna, so that errors caused by calibration pieces are reduced to the minimum, and the calibration precision is further improved.

Claims (10)

1. A calibration device for a circular scanning imaging security inspection system is characterized by comprising: 4 antenna calibration units and 4 single pole double throw switches;

4 calibration antenna units, namely a B-surface receiving antenna calibration unit, an A-surface receiving antenna calibration unit, a B-surface transmitting antenna calibration unit and an A-surface transmitting antenna calibration unit;

a first single-pole double-throw switch is arranged between the input end of the receiver of the A-side transceiver module and the output ends of the A-side receiving antenna array and the B-side receiving antenna calibration unit, so that the input end of the receiver of the A-side transceiver module can be connected with the output end of the A-side receiving antenna array and can also be connected with the output end of the B-side receiving antenna calibration unit through a radio frequency cable;

a second single-pole double-throw switch is arranged between the output end of the transmitter of the A-side transceiver module and the input ends of the A-side transmitting antenna array and the B-side transmitting antenna calibration unit, so that the output end of the transmitter of the A-side transceiver module can be selectively connected with the input end of the A-side transmitting antenna array and can also be connected with the input end of the B-side transmitting antenna calibration unit through a radio frequency cable;

a third single-pole double-throw switch is arranged between the input end of the receiver of the B-side transceiver module and the output ends of the B-side receiving antenna array and the A-side receiving antenna calibration unit, so that the input end of the receiver of the B-side transceiver module can be connected with the output end of the B-side receiving antenna array and can also be connected with the output end of the A-side receiving antenna calibration unit through a radio frequency cable;

a fourth single-pole double-throw switch is arranged between the output end of the transmitter of the B-side transceiver module and the input ends of the B-side transmitting antenna array and the A-side transmitting antenna calibration unit, so that the output end of the transmitter of the B-side transceiver module can be selectively connected with the input end of the B-side transmitting antenna array and can also be connected with the input end of the A-side transmitting antenna calibration unit through a radio frequency cable;

transmitting antenna array B on B surface₁Side-mounted B-side transmitting antenna calibration unit B'₁Calibration Unit B 'for B-side transmitting antenna'₁The A-plane receiving antenna array A is formed by the A-plane receiving antenna array A and the transmitter of the A-plane receiving and transmitting module₂The calibration channel of (1);

receiving antenna array B on B side₂Side-mounted B-side receiving antenna calibration unit B'₂And a B-side receiving antenna calibration unit B'₂The A-surface transmitting antenna array A is formed by the A-surface transmitting antenna array A and the receiver of the A-surface receiving and transmitting module₁The calibration channel of (1);

transmitting antenna array A on A surface₁Side-mounted A-side transmitting antenna calibration unit A'₁A-side transmit antenna calibration unit A'₁The B-plane receiving antenna array B is formed by the transmitter of the B-plane transceiver module₂The calibration channel of (1);

receiving antenna array A on A surface₂Side-mounted A-side receiving antenna calibration unit A'₂Antenna calibration Unit A 'for A-side reception'₂The B-plane transmitting antenna array B is formed by the B-plane transmitting antenna array B and the receiver of the B-plane transmitting-receiving module₁The calibration channel of (1);

a-surface transmitting antenna array A₁A-side receiving antenna array A₂The first plane A and the second plane A are jointly arranged, and the A plane is marked; b-surface transmitting antenna array B₁B-side receiving antenna array B₂The two planes are jointly arranged on a second plane B, and the plane B is marked; the first plane A and the second plane B are oppositely arranged in parallel and can rotate along the rotating shaft under the drive of the servo motor; the rotating shaft is positioned between the first plane A and the second plane B and is parallel to the first plane A and the second plane B, and the distance between the rotating shaft and the first plane A is the same as that between the rotating shaft and the second plane B;

the A-side receiving antenna array has N_RA receiving antenna unit; the receiving period of each antenna unit is T; each receiving antenna unit can respectively transmit and receive the mode with the A surfaceThe receivers of the blocks are connected, and each channel is formed and used as each receiving channel of the A surface;

the A-surface transmitting antenna array has N_TA plurality of transmitting antenna elements; the transmission period of each antenna unit is T; each transmitting antenna unit can be respectively connected with a transmitter of the A-surface transceiver module to form a channel as each transmitting channel of the A-surface;

the B-side receiving antenna array has N_RA receiving antenna unit; the receiving period of each antenna unit is T; each receiving antenna unit can be respectively connected with a receiver of the B-surface transceiver module to form a channel as each receiving channel of the B surface;

the B-side transmitting antenna array has N_TA plurality of transmitting antenna elements; the transmission period of each antenna unit is T; each transmitting antenna unit can be respectively connected with a transmitter of the B-surface transceiver module to form a channel as each transmitting channel of the B surface;

controlling a first single-pole double-throw switch to connect the output end of the A-side receiving antenna array with the input end of a receiver of the A-side transceiver module, and simultaneously controlling a second single-pole double-throw switch to calibrate a B-side transmitting antenna unit B'₁The input end is connected with the output end of the A-side transceiver module transmitter; controlling the A-surface transmitting antenna array not to work; the B-side transmitting antenna array does not work; the A-surface transmitting antenna calibration unit does not work;

controlling the A-side receiving antenna array to sequentially complete the electrical scanning reception of each unit in the antenna array from top to bottom by taking T as a period, and simultaneously controlling the B-side transmitting calibration antenna unit B'₁In the long-hair state with T as the period, N is completed_RAfter the operation of one period T, each A-side receiving channel finishes receiving B-side transmitting antenna calibration unit B'₁Reception of transmitted signals, output N from the receiver of the A-plane Transceiver Module_RReceiving signals, respectively denoted as s_RAi，i＝1,2,….,N_R；s_RAiReceiving signals for the ith path;

to N_RThe method comprises the steps that a path of received signals are sampled respectively, and a plurality of sampling points are obtained after each path of received signals are sampled to form a path of discrete signals; fourier transform is carried out on each path of discrete signal to obtain each pathFourier transformed signals, and determining maximum value of amplitude of each path of Fourier transformed signals and sampling point position RA _ RANGE corresponding to the maximum value_maxiAnd phase

Determining the distance between the B-surface transmitting calibration antenna unit and the A-surface receiving antenna array unit according to the position of the B-surface transmitting calibration antenna unit and the position of the ith unit in the A-surface receiving antenna array unit, thereby determining the phase compensation amount corresponding to each unit in the A-surface receiving antenna array; the phase compensation quantity corresponding to each unit in the A-surface receiving antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 1 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position RA _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 2 corresponding to each path of Fourier transformed signals_i；

According to the phase delta 1 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform after compensation_i(ii) a Phase compensation amount delta 2 corresponding to each path of Fourier transformed signal_iDetermining receiver output N of A-plane transceiver module_RCompensation RA for the phase of the received signal_compensate；

Secondly, controlling a second single-pole double-throw switch to connect the input end of the A-side transmitting antenna array with the output end of the A-side transceiver module transmitter, and simultaneously controlling a first single-pole double-throw switch to calibrate a B-side receiving antenna unit B'₂The output end of the antenna is connected with the input end of the A-side transceiver module receiver to control the B-side transmitting antenna array not to work; the B-surface transmitting antenna calibration unit does not work; the A-surface transmitting antenna calibration unit does not work;

controlling the A-surface transmitting antenna array to sequentially move from top to bottom by taking T as a periodCompleting emission of each unit in the antenna array, and simultaneously controlling a B-side receiving antenna calibration unit B'₂In the state of taking T as cycle length to finish N_TB-side receiving antenna calibration unit B 'after operation of one period T'₂Completing the receiving of the transmitting signals of the units of the A-side transmitting antenna array, and calibrating the unit B 'from the B-side receiving antenna'₂Output N_TReceiving signals, respectively denoted as s_TAi，i＝1,2,….,N_T；s_TAiReceiving signals for the ith path;

to N_TThe method comprises the steps that a path of received signals are sampled respectively, and a plurality of sampling points are obtained after each path of received signals are sampled to form a path of discrete signals; fourier transform is carried out on each path of discrete signals to obtain each path of signals after Fourier transform, and the maximum value of the amplitude of each path of signals after Fourier transform and the sampling point position TA _ RANGE corresponding to the maximum value are determined_maxiAnd phase

Determining the distance between the B-surface receiving calibration antenna unit and the A-surface transmitting antenna array unit according to the position of the B-surface receiving antenna calibration unit and the position of the ith unit in the A-surface transmitting antenna array unit, thereby determining the phase compensation amount corresponding to each unit in the A-surface transmitting antenna array; the phase compensation quantity corresponding to each unit in the A-surface transmitting antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 3 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position TA _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 4 corresponding to each path of Fourier transformed signals_i；

According to the phase delta 3 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform after compensation_i(ii) a Phase compensation amount delta 4 corresponding to each path of Fourier transformed signal_iDetermining the compensation TA of the phase of the transmitted signal of the transmitter of the A-plane transceiver module_compensate；

Controlling a third single-pole double-throw switch to connect the output end of the B-side receiving antenna array with the input end of a B-side receiving and transmitting module receiver, and simultaneously controlling a fourth single-pole double-throw switch to connect the input end of the A-side transmitting antenna calibration unit with the output end of a B-side receiving and transmitting module transmitter; controlling the B-surface transmitting antenna array not to work; the A-side transmitting antenna array does not work; b, the transmitting antenna calibration unit works;

controlling the B-side receiving antenna array to sequentially complete the electric scanning reception of each unit in the antenna array from top to bottom by taking T as a period, and simultaneously controlling the A-side transmitting antenna calibration unit A'₁In the state of long hair with 8 mus as period, N is completed_RAfter 8 mu s periods of operation, each B-side receive channel completes calibration of the A-side transmit antenna calibration unit A'₁Reception of transmitted signals, output N from receiver of B-plane transceiver module_RReceiving signals, respectively denoted as s_RBi，i＝1,2,….,N_R；s_RBiReceiving signals for the ith path;

to N_RRespectively sampling the received signals, obtaining a plurality of sampling points after sampling each received signal to form a discrete signal, carrying out Fourier transform on each discrete signal to obtain signals after Fourier transform, and determining the maximum value of the amplitude of each signal after Fourier transform and the sampling point position RB _ RANGE corresponding to the maximum value_maxiAnd phase

Determining the distance between the A-surface transmitting calibration unit and the B-surface receiving antenna array unit according to the position of the A-surface transmitting antenna calibration unit and the position of the ith unit in the B-surface receiving antenna array unit, thereby determining the phase compensation amount corresponding to each unit in the B-surface receiving antenna array; the phase compensation quantity corresponding to each unit in the B-surface receiving antenna array is used for the phase of the sampling point corresponding to the maximum value of the signal amplitude after Fourier transform of each path

Compensating to obtain the phase delta 5 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position RB _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation quantity delta 6 corresponding to each path of signals after Fourier transform_i；

According to the phase delta 5 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after the compensation and the Fourier transform_iPhase compensation amount Delta 6 corresponding to each Fourier transformed signal_iDetermining receiver output N of B-plane transceiver module_RCompensation RB for the phase of the received signal_compensate；

Finally, controlling a fourth single-pole double-throw switch to connect the input end of the B-face transmitting antenna array with the output end of the B-face transceiver module transmitter, and simultaneously controlling a third single-pole double-throw switch to connect the input end of the A-face receiving antenna calibration unit with the output end of the B-face transceiver module receiver to control the A-face transmitting antenna array not to work; the B-surface transmitting antenna calibration unit does not work; the A-surface transmitting antenna calibration unit does not work;

controlling the B-side transmitting antenna array to sequentially finish transmitting each unit in the antenna array from top to bottom by taking T as a period, and simultaneously controlling the A-side receiving antenna calibration unit A'₂In the state of taking T as cycle length to finish N_TAfter T periods of operation, A-side receiving antenna calibration unit A'₂Completing the receiving of the transmitting signals of the units of the B-side transmitting antenna array, and calibrating the unit A 'from the A-side receiving antenna'₂Output N_TReceiving signals, respectively denoted as s_TBi，i＝1,2,….,N_T；s_TBiReceiving signals for the ith path;

to N_TRespectively sampling the received signals, obtaining multiple sampling points after sampling each received signal to form a discrete signal, performing Fourier transform on each discrete signal to obtain Fourier transformed signals, and determining Fourier transformed signalsMaximum amplitude and sampling point position TB _ RANGE corresponding to maximum amplitude_maxiAnd phase

Determining the distance between the A-surface receiving calibration antenna unit and the B-surface transmitting antenna array unit according to the position of the A-surface receiving antenna calibration unit and the position of the ith unit in the B-surface transmitting antenna array unit, thereby determining the phase compensation amount corresponding to each unit in the B-surface transmitting antenna array; the phase compensation quantity corresponding to each unit in the B-surface transmitting antenna array is used for carrying out phase compensation on the sampling point corresponding to the maximum value of the amplitude of each path of signals after Fourier transform

Compensating to obtain the phase delta 7 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after Fourier transform_i；

According to the sampling point position TB _ RANGE corresponding to the maximum value of the signal amplitude after each path of Fourier transform_maxiDetermining the phase compensation amount delta 8 corresponding to each path of Fourier transformed signals_i；

According to the phase delta 7 of the sampling point corresponding to the maximum value of the amplitude of each path of signal after the compensation and the Fourier transform_i(ii) a Phase compensation amount delta 8 corresponding to each path of Fourier transformed signal_iDetermining a compensation TB for the phase of the transmission signal of the transmitter of the B-plane transceiver module_compensate；

Outputting N of receiver of A-plane transceiver module_RCompensation RA for the phase of the received signal_compensateN of transmitter output of A-plane transceiver module_TCompensation TA of phase of channel transmitting signal_compensateReceiver output N of B-side transceiver module_RCompensation RB for the phase of the received signal_compensateAnd N of transmitter output of B-plane transceiver module_TCompensation quantity TB of road transmitting signal phase_compensateAnd storing.

2. According to claim1 a circle scanning formation of image safety inspection calibrating device which characterized in that: receiver output N of A-plane transceiver module_RCompensation RA for the phase of the received signal_compensate。

3. The circular scanning imaging security inspection calibration device of claim 1, wherein: receiver output N of A-plane transceiver module_RCompensation RA for the phase of the received signal_compensate＝Δ1_i*Δ2_i。

4. The circular scanning imaging security inspection calibration device according to claim 1, characterized in that: n of transmitter output of A-plane transceiver module_TCompensation TA of phase of channel transmitting signal_compensate＝Δ3_i*Δ4_i。

5. The circular scanning imaging security inspection calibration device of claim 1, wherein: receiver output N of B-plane transceiver module_RCompensation RB for the phase of the received signal_compensate＝Δ5_i*Δ6_i。

6. The circular scanning imaging security inspection calibration device of claim 1, wherein: n of transmitter output of B-plane transceiver module_TCompensation quantity TB of road transmitting signal phase_compensate＝Δ7_i*Δ8_i。

7. The circular scanning imaging security inspection calibration device of claim 1, wherein: t is 8. mu.s.

8. The circular scanning imaging security inspection calibration device of claim 1, wherein: b-side transmitting antenna calibration unit B'₁The state of long hair with T as the cycle means that: b-plane transmitting calibration antenna unit at N_RThe signal is transmitted continuously for a period T.

9. The circular scanning imaging security inspection calibration device of claim 1, wherein: b-side receiving antenna calibration unit B'₂The state of cycle contraction with T means: b-plane receiving calibration antenna unit at N_TThe signal is continuously received for T periods.

10. The circular scanning imaging security inspection calibration device of claim 1, wherein: a-side transmitting antenna calibration unit A'₁The state of long hair with T as the cycle means that: a-plane transmitting calibration antenna unit is in N_RThe signal is transmitted continuously for a period T.

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