CN111505555A - Non-coherent electromagnetic detection external field automatic calibration system and method - Google Patents
Non-coherent electromagnetic detection external field automatic calibration system and method Download PDFInfo
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Abstract
An automatic calibration system and method for non-coherent electromagnetic detection external field belongs to the technical field of electromagnetic detection. The invention comprises a broadband signal generator, a calibration link regulation and control unit, a calibration transmitting antenna group and a calibration control unit. The invention adopts a non-coherent calibration method, designs a calibration signal source independent of a detection system, horizontally and directionally radiates to the detection antenna through the calibration transmitting antenna in a remote way, and feeds a calibration signal from the initial end of a link of the detection system in a wireless way, thereby effectively solving the problem that the traditional coherent calibration method can not realize the calibration of the whole link of the detection system.
Description
Technical Field
The invention relates to a non-coherent electromagnetic detection external field automatic calibration system and a method, belonging to the technical field of electromagnetic detection.
Background
After the electromagnetic detection system is used for a long time, the measurement precision of the system can drift, the accuracy of the measured data is influenced, and if the system is not calibrated in time, the measured data is invalid in serious conditions, so that the detection task fails. In addition, before the detection task is executed, the function and performance of the detection system need to be checked to comprehensively understand and grasp the working state of the detection system, so as to ensure that the detection task can be normally executed. At present, a conventional calibration method is to generate a simple coherent calibration signal inside a detection system, and feed the signal from the rf front end of the detection system through link design, so as to complete the detection of the on-off state, partial functions, and performance of the link of the detection system. This calibration method has several disadvantages: firstly, because the calibration signal is fed in from the radio frequency front end of the detection system in a wired mode without passing through the detection antenna, the full-link calibration of the detection system cannot be realized; secondly, the calibration signal is generated from the internal circuit of the detection system, and the frequency coverage range, signal system complexity, signal output accuracy and the like of the calibration signal are difficult to meet the calibration requirements of comprehensively checking the function and performance of the detection system. Another common calibration method is to use a high-precision signal instrument to feed in a calibration signal from the front end of the radio frequency of the detection system, so as to generate a broadband and high-precision signal meeting the calibration requirement, but the calibration requirement of the full link cannot be realized, and when each channel of the detection system needs to be comprehensively checked, a large amount of wire changing operations need to be manually executed, which affects the calibration efficiency and the measurement accuracy. And the two methods are both internal field calibration methods, the influence of external field environmental factors on a detection system cannot be considered, and the application effect after calibration is not ideal.
Disclosure of Invention
The technical problem solved by the invention is as follows: the system and the method overcome the defects of the prior art, and provide the non-coherent electromagnetic detection external field automatic calibration system and the method, so that the full-link, high-precision, automatic and quick targets of the electromagnetic detection system are realized, and the calibration requirements of the detection system are comprehensively met.
The technical solution of the invention is as follows: a non-coherent electromagnetic detection external field automatic calibration system comprises a broadband signal generator, a calibration link regulation and control unit, a calibration transmitting antenna group and a calibration control unit;
the broadband signal generator is used for generating calibration signals of various frequency bands and types and outputting the calibration signals to the calibration link regulation and control unit;
the calibration link regulating and controlling unit receives the calibration signal, performs power compensation and then performs power amplification according to the frequency band of the calibration signal; amplifying the calibration signal to a fixed power value, and outputting the calibration signal to a calibration transmitting antenna group;
the calibration transmitting antenna group receives the calibration signal amplified by the power amplification module and completes the directional space radiation which is horizontally aligned with the axial direction of the mouth surface of the detection antenna;
the calibration control unit is used for controlling the broadband signal generator to generate calibration signals and controlling the calibration link regulation and control unit to process the received calibration signals; and the detection system is connected with the detection system, and controls the detection system to receive the calibration signal, execute calibration according to a calibration algorithm and calibrate the detection system.
Furthermore, the calibration link regulation and control unit comprises a line loss compensation module, a radio frequency switching module, a power amplification module, a calibration transmitting antenna, a control module and a display module;
the line loss compensation module receives the calibration signal, amplifies the received calibration signal to compensate the cable loss, and transmits the cable loss to the radio frequency switching module;
the radio frequency switching module receives the calibration signal transmitted by the line loss compensation module and gates the corresponding power amplification module according to the signal frequency band;
the power amplification module comprises a plurality of power amplification modules; each power amplification module amplifies the power of the signal of the corresponding frequency band to fixed power and outputs the signal to a corresponding calibration transmitting antenna;
the control module controls the power amplification module to gate according to the frequency band of the received calibration signal, detects the on-off state of each link and sends the on-off state to the display module; detecting the power intensity of the calibration signal, controlling the power amplification module to regulate and control the power of the calibration signal, detecting the working state of a link, and sending the working state to the display module; monitoring the output power in real time, and transmitting an alarm prompt to a display module when the output power reaches a saturation state;
and the display module receives the on-off state, the working state and the alarm prompt of the link and displays the on-off state, the working state and the alarm prompt.
Furthermore, the number of the power amplifier modules is four, the first power amplifier module corresponds to a 0.4GHz-1GHz frequency band, the second power amplifier module corresponds to a 1GHz-6GHz frequency band, the third power amplifier module corresponds to a 6GHz-18GHz frequency band, and the fourth power amplifier module corresponds to an 18GHz-26.5GHz frequency band.
Furthermore, the calibration transmitting antennas are four, the first power amplifier module corresponds to a log-periodic antenna, and the second power amplifier module, the third power amplifier module and the fourth power amplifier module correspond to the first horn antenna, the second horn antenna and the third horn antenna respectively.
Furthermore, the broadband signal generator, the calibration link regulation and control unit and the calibration transmitting antenna group form a calibration system, and the calibration control unit is positioned in the detection system; the calibration system is connected with the detection system through a network, is separately deployed in a preset distance range, and executes calibration according to a calibration algorithm. .
Furthermore, the preset distance range meets the requirements that the strength of a calibration signal transmitted by a calibration system received by a detection system is within-80 dBm-0 dBm of the dynamic range of the detection system, the distance between a receiving antenna of the detection system and a calibration transmitting antenna of the calibration system is not less than 2L x L/r, wherein L is the maximum equivalent length of the receiving antenna, r is the wavelength, radiation signals in the respective beam ranges of the four calibration transmitting antennas can directly reach the port face of the receiving antenna of the detection system, and the distance between the receiving antenna of the detection system and the calibration transmitting antenna of the calibration system is not more than 100 m.
Further, the calibration executed according to the calibration algorithm comprises the following steps:
calculating theoretical power density S of a receiving antenna array surface of a detection system:
S＝ERP/(4*π*R*R)
ERP＝P0+L0+G0+G1+Gain
wherein, P0 is the output power value of the broadband signal generator, L0 is the loss of the long radio frequency cable connecting the signal source and the link regulation and control amplifying unit, G0 is the amplification Gain value of the line loss compensation module, G1 is the regulation and control value of the power amplifier module, Gain is the Gain of the calibration transmitting antenna, ERP calibration transmitting antenna radiation power, R is the calibration antenna radiation distance, and pi is the circumference ratio;
measuring the actual power density S' reaching the array surface of the detecting receiving antenna;
calculating a calibration deviation delta S: Δ S ═ S' -S;
and measuring for multiple times, and calculating to obtain the root mean square deviation of the calibration deviation: Δ S';
compensating the root mean square deviation to a link of the detection system to finish calibration of the detection system.
Further, the calibration system radiates a calibration signal power of not less than 46 dBm.
Further, the broadband signal generator comprises a signal editing module and a signal generating module; the signal editing module edits the style and the parameters of the calibration signal and downloads the style and the parameters to the signal generating module; and the signal generation module converts the edited calibration signal into a radio frequency signal and outputs the radio frequency signal.
An automatic calibration method for non-coherent electromagnetic detection external field comprises the following steps:
selecting an outfield calibration place according to actual calibration requirements, determining the distance R between a detection system and a calibration system and a remote control network connection mode, erecting the detection antenna and the calibration transmitting antenna at the same height, and aligning the horizontal axes of the mouth surfaces of the detection antenna and the calibration transmitting antenna;
the signal editing module of the broadband signal generator is controlled by the calibration control unit to edit the style and parameters of the radio frequency calibration signal, then the radio frequency calibration signal is downloaded to the signal production module, and the edited signal is converted into an actual radio frequency signal by the signal production module and is output; the output radio frequency signal is transmitted to a calibration link control unit through a long cable;
the calibration link control unit receives the calibration signal sent by the broadband signal generation unit, performs signal compensation, calibration channel switching and signal power regulation on the calibration signal, and transmits the calibration signal to a corresponding calibration transmitting antenna;
after receiving the calibration signal processed by the calibration link control unit, the calibration transmitting antenna amplifies the calibration signal, completes spatial radiation and sends the calibration signal to a detection system;
a detection antenna of the detection system receives the calibration signal, and transmits a detection data result to a calibration control unit of the detection main control unit after frequency conversion processing and displays the detection data result in real time;
the calibration control unit checks the actually detected antenna array surface power density and the theoretical value of the antenna array surface power density according to a calibration algorithm to obtain the calibration deviation;
adjusting the deployment distance between the detection system and the calibration system as required to obtain multiple calibration deviations, and solving a calibration deviation root mean square value according to the multiple calibration deviations;
and compensating the calibration deviation root mean square value to a link of the detection system to finish calibration of the whole detection system.
Compared with the prior art, the invention has the advantages that:
(1) the invention adopts a non-coherent calibration method, designs a calibration signal source independent of a detection system, horizontally and directionally radiates to the detection antenna through the calibration transmitting antenna in a remote way, and feeds a calibration signal from the initial end of a link of the detection system in a wireless way, thereby effectively solving the problem that the traditional coherent calibration method can not realize the calibration of the whole link of the detection system.
(2) The invention adopts an external field calibration mode, and the calibration system and the electromagnetic detection system are remotely arranged and deployed and are connected with each other through a network. The method can be used for deploying and developing calibration work under the actual scene detection environment according to application requirements, comprehensively considering the influences of complex environmental factors such as detection site terrain, landform and peripheral facilities, and avoiding the problem that the interior site calibration work is invalid due to the fact that the environmental factors exist in an exterior application scene after the traditional interior site is adopted for accurate calibration. The calibration mode is higher in adaptability and more accurate in calibration data.
(3) The invention adopts an automatic calibration mode, is different from the traditional manual calibration mode, can automatically execute frequency switching according to parameters such as calibration signal frequency interval, signal frequency switching time and the like preset by a user, quickly traverse the whole broadband system calibration, store and process calibration data in real time, does not need manual intervention in the period, and comprehensively improves the calibration work efficiency.
(4) The calibration link regulation and control unit adopts a shunt power regulation and control technology, realizes power balance regulation and control and weak signal receiving of broadband calibration signals, simultaneously designs a local and remote control dual-switching control mode, detects the working states of power regulation and control and link switching in real time and visually displays and outputs the working states through a monitoring and displaying technology, and improves the reliability of a calibration system.
Drawings
FIG. 1 is a schematic diagram of a calibration system according to the present invention;
FIG. 2 is a block diagram of a calibration link control unit according to the present invention;
FIG. 3 is a block diagram of an outfield deployment of the calibration system of the present invention;
FIG. 4 is a block diagram of a calibration link theoretical calculation according to the present invention;
FIG. 5 is a flowchart of the overall operation of the calibration system of the present invention.
Detailed Description
The invention is further explained and illustrated in the following figures and detailed description of the specification.
Referring to fig. 1, an automatic calibration system for non-coherent electromagnetic detection external field includes a wideband signal generator, a calibration link regulation unit, a calibration transmitting antenna set and a calibration control unit;
the broadband signal generator is used for generating calibration signals of various frequency bands and types and outputting the calibration signals to the calibration link regulation and control unit;
the calibration link regulating and controlling unit receives the calibration signal, performs power compensation and then performs power amplification according to the frequency band of the calibration signal; amplifying the calibration signal to a fixed power value, and outputting the calibration signal to a calibration transmitting antenna group;
the calibration transmitting antenna group receives the calibration signal amplified by the power amplification module and completes the directional space radiation which is horizontally aligned with the axial direction of the mouth surface of the detection antenna;
the calibration control unit is used for controlling the broadband signal generator to generate calibration signals and controlling the calibration link regulation and control unit to process the received calibration signals; and the detection system is connected with the detection system, and controls the detection system to receive the calibration signal, execute calibration according to a calibration algorithm and calibrate the detection system.
The following further describes embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1: the invention discloses a non-coherent electromagnetic detection external field automatic calibration system and a method, which are characterized by comprising the following steps: the system comprises a broadband signal generator, a calibration link regulation and control unit, a calibration transmitting antenna group and a calibration control unit, wherein:
broadband signal generator: the calibration device comprises a signal editing module and a signal generating module, wherein the signal editing module is used for generating wide-frequency-band, multi-type and high-precision calibration signals and outputting the signals to a calibration link regulating and controlling unit; the signal editing module is mainly used for editing signal parameters such as communication signals and radar signals, and specifically comprises parameters such as signal frequency, signal power, pulse repetition Period (PRI), Pulse Width (PW), modulation type and the like. The signal generation module is mainly used for generating and outputting actual signals of the signals with the edited parameters.
A calibration link regulation and control unit: the calibration signal generated by the broadband signal generator is received, power compensation is carried out, the calibration signal is transmitted to the radio frequency switching module, the corresponding power amplification module is switched according to the frequency band of the calibration signal, the calibration signal is amplified to a fixed power value through power amplification of frequency bands, and then the calibration signal is output to the calibration transmitting antenna group.
As shown in fig. 2, the calibration link regulating and controlling unit: including line loss compensation module, radio frequency switch module, 4 power amplification modules, control module, display module, wherein:
line loss compensation module: and amplifying the broadband calibration signal transmitted by the radio frequency long cable to compensate the line loss, and transmitting the signal to the radio frequency switching module.
The radio frequency switching module: and receiving the calibration signal transmitted by the line loss supplementing module, and gating the corresponding power amplification module according to the signal frequency band.
A power amplification module: by adopting the design of frequency dividing bands, the first power amplification module corresponds to a 0.4GHz-1GHz frequency band, the second power amplification module corresponds to a 1GHz-6GHz frequency band, the third power amplification module corresponds to a 6GHz-18GHz frequency band, and the fourth power amplification module corresponds to an 18GHz-26.5GHz frequency band. And the four power amplification modules perform power amplification on the signals of the corresponding frequency bands to fixed power and output the fixed power to the corresponding calibration transmitting antenna.
A control module: on one hand, the calibration link gating is controlled according to the frequency band of the calibration signal, and the on-off state of each link is detected and transmitted to the display module; and on the other hand, the power intensity of the calibration signal is detected, the power amplification unit is controlled to regulate and control the power of the signal, the working state of each link is detected and transmitted to the display module, and when the output power reaches a saturated state, an alarm prompt is transmitted to the display module. The control mode of the radio frequency switching module comprises a local switching mode and a remote switching mode.
A display module: and displaying the link on-off state, the link working state and the alarm prompt.
Calibrating a transmitting antenna group: the power amplification module comprises a log periodic antenna, a first horn antenna, a second horn antenna and a third horn antenna, and is in one-to-one correspondence with four power amplification modules. And receiving the calibration signal amplified by the power amplification module to complete directional space radiation in the direction axially aligned with the aperture surface of the detection antenna.
Calibration control unit: the system comprises a calibration signal control module and a system calibration module. The calibration signal control single module mainly completes remote control of the broadband signal generator and the calibration link regulation and control unit, and controls calibration signal generation, frequency band switching and power regulation and control. And the system calibration module controls the detection system to receive the calibration signal, executes calibration according to a calibration algorithm and calibrates the detection system.
As shown in fig. 3, the wideband signal generator, the calibration link regulation and control unit, and the calibration transmitting antenna set are integrated on the calibration platform, and the calibration control unit is integrated on the detection platform. During calibration, under an external field environment, the calibration platform and the detection platform are separately deployed at a long distance R and are connected with a network, the calibration transmitting antenna and the detection antenna are simultaneously raised to the same horizontal height h, a calibration signal meeting the radiation power threshold P of the receiving sensitivity of the detection system is transmitted through the remote control calibration system, the detection system directly receives the calibration signal, and calibration work is automatically completed according to a calibration algorithm.
The determination of the deployment distance between the calibration system and the detection system needs to satisfy the following three constraint conditions:
firstly, the maximum radiation power ERP of the calibration system is 46dBm, an appropriate calibration distance R is selected, it is ensured that the intensity of the calibration signal received by the detection system is within a dynamic range of-80 dBm to 0dBm, taking the example that the calibration signal received by the detection system reaches an optimal medium-strength level, if the frequency of the signal to be detected is 12GHz, the calibration signal is selected, and the deployment distance R is 40m, the attenuation through space transmission is L s- (32.4+20 log 00MHz +20 log 1201201201201201201201201200.04km) -86dBm, and the intensity of the calibration signal received by the detection system is ERP 1P 0+ L s-46 m-86 dBm-40 dBm, and the deployment distance is proper.
Secondly, the position of the detecting antenna deployment needs to meet the far-field test condition (R) of the calibration transmitting antenna>2L × L/R, where R is distance, L is the maximum equivalent length of the antenna, and R is wavelength), avoiding antenna blind areas and ensuring test accuracy, taking the calibration signal f of 1GHz as an example, the equivalent antenna length L of the low-band logarithmic period antenna is 1m, and the signal wavelength R is c/f (3 × 10) ═ c/f8)/(1*109) The far field condition was calculated as 0.3 m: r>2L × L/r ═ 6.67m, (2 × 1)/0.3 × 6.67m, low band log periodic antenna beam width is 30 °, and when the calibrated transmit antenna is raised to h ═ 10m, it is said to beEnsuring that the detecting antenna is completely within the beam range, the distance R between the detecting antenna and the detecting antenna is at least: r ═ h × cot (15 °) 37.3 m. Meanwhile, in order to ensure that the axes of the detecting antenna aperture surface and the calibration transmitting antenna aperture surface are aligned for receiving, the height of the detecting antenna is also 10m, and the calibration result is optimal.
Thirdly, the detection system and the calibration system are connected through a network cable, the transmission quality and speed of the data network are considered, and the maximum length of the network cable is preferably less than or equal to 100m by combining the past engineering experience.
The three constraint conditions are combined, the deployment distance range of the detection system and the calibration system is determined to be 35-100 m through detailed calculation, and specific numerical values can be selected in the range according to actual requirements.
As shown in fig. 4, the specific calibration algorithm is as follows:
1) theoretically calculating the power density S of the arrival detection receiving antenna array surface:
S＝ERP/(4*π*R*R)
ERP＝P0+L0+G0+G1+Gain
the method comprises the steps of obtaining a broadband signal generator, obtaining a broadband signal generator output power value P0, obtaining a radio frequency long cable loss of a connecting signal source and a link regulation and control amplification unit L0, obtaining an amplification Gain value of a line loss compensation module G0, obtaining a regulation and control value of a power amplification module G1, obtaining Gain of a calibration transmitting antenna, obtaining ERP calibration transmitting antenna radiation power, and obtaining R calibration transmitting antenna radiation distance.
2) Actual measurement arrival detection receiving antenna array power density S':
after the wideband signal generator actually outputs the power value P0, the power density of the detecting antenna aperture surface obtained by actual measurement at the detecting receiving end is S'.
3) Calibration deviation Δ S: Δ S ═ S' -S
4) And (3) measuring for multiple times, and calculating to obtain the root mean square deviation: delta S'
And finally, compensating the root mean square deviation obtained by calibration to a link of the detection system so as to finish the calibration work of the detection system.
As shown in fig. 5: in order to express more intuitively, the invention provides a practical application case to explain the process:
(1) introduction to background requirements
According to the actual requirement of a certain electromagnetic environment detection task of a certain team, before the detection task, a calibration system is needed to be used for carrying out system calibration on the detection system, the function and the performance of the detection system are checked, and whether the working state of the detection system is normal or not is confirmed, so that the successful execution of the detection task is guaranteed.
(2) Outfield calibration system and detection system deployment
1) And selecting an external calibration site. And selecting a place for external field calibration according to task requirements when a detection task is formally executed, and detecting a deployment area where the system is located. The calibration executed in the scene can consider the influence of environmental factors such as actual landform, landform and peripheral facility equipment on the detection system, and the calibration result is more accurate and reliable.
2) And determining the deployment distance R between the calibration system and the detection system. According to the constraint conditions, the deployment distance range of the detection system and the calibration system is 35-100 m, and the specific deployment distance needs to be determined after detailed calculation according to detection tasks, detection frequency bands and the like.
Since the detection task is battlefield electromagnetic environment detection, and needs to detect electromagnetic signals in the range of 0.4 GHz-26.5GHz, full-band calibration is needed for the detection system. According to the maximum radiation power ERP of the calibration system being 46dBm, the power intensity of the calibration signal received by the detection system under different deployment intervals of the signals of different frequency bands is calculated as shown in the following table. After analysis: the strength of the calibration signals received by the detection system is within-80 dBm-0 dBm of the dynamic range of the system, and the full-band calibration can be performed one by selecting different deployment intervals in consideration of multiple calibration.
(3) Full-band automatic calibration work
1) In order to ensure that the axes of the mouth surface of the detecting antenna and the mouth surface of the calibration transmitting antenna are aligned for receiving, the heights of the detecting antenna and the calibration transmitting antenna are adjusted to be 10 m.
2) On a detection system platform, a calibration control unit remotely controls a calibration system to firstly transmit a simple continuous wave signal so as to test the on-off of a link. After the signal is successfully sent, whether the detection system end can receive the signal is confirmed, and if the signal is not received, whether the calibration system and the detection system are normally connected is checked in time; if the signal is received and the amplitude of the received signal is consistent with the theoretical calculated value, the link of the detection system is communicated and the working state is normal, and the calibration process can be executed.
3) Firstly, a broadband signal generating unit of a calibration system is remotely controlled by a calibration control unit, a signal style is edited into a simple pulse signal, signal parameters (the initial frequency is 0.4GHz, the end frequency is 26.5GHz, the transmitting power is 0dBm, the signal pulse width is 20us, the signal repetition period is 200us) are set, calibration parameters (the radiation radius R of a calibration transmitting antenna is 35m, the calibration frequency interval is 10MHz, and the calibration time interval is 10s) are set, and the transmission of a radio frequency signal is controlled. According to the detection task of the detection system, which is electromagnetic environment detection, the segmented calibration needs to be executed to automatically traverse the 0.4 GHz-26.5GHz full frequency band.
4) Secondly, the calibration system automatically executes a calibration task, calibration data are automatically stored in the calibration process, after one full-band calibration is successfully executed, in order to ensure the reliability and accuracy of the calibration data, the distances R between the calibration system and the detection system are respectively adjusted to be 40m, 45m and 50m, and multiple times of calibration are executed according to the steps 1) to 3).
5) And finally, counting and processing the calibration data for multiple times, automatically compensating the calibration result into a detection system link, and finishing the calibration work of the whole detection system.
The broadband signal generating unit of the calibration system is remotely controlled through the calibration control unit, radio frequency signals of different styles are transmitted, and the functions of signal detection, signal classification, signal identification and the like of the detection system are checked one by one; checking whether the signal power port surface power density measurement precision meets the technical index requirement of less than or equal to 2dBm/m2And the like. And finishing the work of the system after all the functions and the performance are checked.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A non-coherent electromagnetic detection external field automatic calibration system is characterized in that: the system comprises a broadband signal generator, a calibration link regulation and control unit, a calibration transmitting antenna group and a calibration control unit;
the broadband signal generator is used for generating calibration signals of various frequency bands and types and outputting the calibration signals to the calibration link regulation and control unit;
the calibration link regulating and controlling unit receives the calibration signal, performs power compensation and then performs power amplification according to the frequency band of the calibration signal; amplifying the calibration signal to a fixed power value, and outputting the calibration signal to a calibration transmitting antenna group;
the calibration transmitting antenna group receives the calibration signal amplified by the power amplification module and completes the directional space radiation which is horizontally aligned with the axial direction of the mouth surface of the detection antenna;
the calibration control unit is used for controlling the broadband signal generator to generate calibration signals and controlling the calibration link regulation and control unit to process the received calibration signals; and the detection system is connected with the detection system, and controls the detection system to receive the calibration signal, execute calibration according to a calibration algorithm and calibrate the detection system.
2. The system according to claim 1, wherein the external field calibration system comprises: the calibration link regulation and control unit comprises a line loss compensation module, a radio frequency switching module, a power amplification module, a calibration transmitting antenna, a control module and a display module;
the line loss compensation module receives the calibration signal, amplifies the received calibration signal to compensate the cable loss, and transmits the cable loss to the radio frequency switching module;
the radio frequency switching module receives the calibration signal transmitted by the line loss compensation module and gates the corresponding power amplification module according to the signal frequency band;
the power amplification module comprises a plurality of power amplification modules; each power amplification module amplifies the power of the signal of the corresponding frequency band to fixed power and outputs the signal to a corresponding calibration transmitting antenna;
the control module controls the power amplification module to gate according to the frequency band of the received calibration signal, detects the on-off state of each link and sends the on-off state to the display module; detecting the power intensity of the calibration signal, controlling the power amplification module to regulate and control the power of the calibration signal, detecting the working state of a link, and sending the working state to the display module; monitoring the output power in real time, and transmitting an alarm prompt to a display module when the output power reaches a saturation state;
and the display module receives the on-off state, the working state and the alarm prompt of the link and displays the on-off state, the working state and the alarm prompt.
3. The system according to claim 2, wherein the external field calibration system comprises: the number of the power amplification modules is four, the first power amplification module corresponds to a 0.4GHz-1GHz frequency band, the second power amplification module corresponds to a 1GHz-6GHz frequency band, the third power amplification module corresponds to a 6GHz-18GHz frequency band, and the fourth power amplification module corresponds to an 18GHz-26.5GHz frequency band.
4. The system according to claim 3, wherein the external field calibration system comprises: the calibration transmitting antennas are four, the first power amplification module corresponds to the log-periodic antenna, and the second power amplification module, the third power amplification module and the fourth power amplification module correspond to the first horn antenna, the second horn antenna and the third horn antenna respectively.
5. The system according to claim 1, wherein the external field calibration system comprises: the broadband signal generator, the calibration link regulation and control unit and the calibration transmitting antenna group form a calibration system, and the calibration control unit is positioned in the detection system; the calibration system is connected with the detection system through a network, is separately deployed in a preset distance range, and executes calibration according to a calibration algorithm. .
6. The system of claim 5, wherein the predetermined distance range is such that the calibration signal strength received by the detection system from the calibration system is within-80 dBm to 0dBm, the distance between the receiving antenna of the detection system and the calibration transmitting antenna of the calibration system is not less than 2L x L/r, wherein L is the maximum equivalent length of the receiving antenna, r is the wavelength, and the radiation signals within the respective beam ranges of the four calibration transmitting antennas can reach the port of the receiving antenna of the detection system, and the distance between the receiving antenna of the detection system and the calibration transmitting antenna of the calibration system is not more than 100 m.
7. The system of claim 5, wherein the calibration algorithm comprises the steps of:
calculating theoretical power density S of a receiving antenna array surface of a detection system:
S＝ERP/(4*π*R*R)
ERP＝P0+L0+G0+G1+Gain
wherein, P0 is the output power value of the broadband signal generator, L0 is the loss of the long radio frequency cable connecting the signal source and the link regulation and control amplifying unit, G0 is the amplification Gain value of the line loss compensation module, G1 is the regulation and control value of the power amplifier module, Gain is the Gain of the calibration transmitting antenna, ERP calibration transmitting antenna radiation power, R is the calibration antenna radiation distance, and pi is the circumference ratio;
measuring the actual power density S' reaching the array surface of the detecting receiving antenna;
calculating a calibration deviation delta S: Δ S ═ S' -S;
and measuring for multiple times, and calculating to obtain the root mean square deviation of the calibration deviation: Δ S';
compensating the root mean square deviation to a link of the detection system to finish calibration of the detection system.
8. The system according to claim 5, wherein the external field calibration system comprises: the calibration signal power radiated by the calibration system is not less than 46 dBm.
9. The system according to claim 1, wherein the external field calibration system comprises: the broadband signal generator comprises a signal editing module and a signal generating module; the signal editing module edits the style and the parameters of the calibration signal and downloads the style and the parameters to the signal generating module; and the signal generation module converts the edited calibration signal into a radio frequency signal and outputs the radio frequency signal.
10. An automatic calibration method for non-coherent electromagnetic detection external field is characterized by comprising the following steps:
selecting an outfield calibration place according to actual calibration requirements, determining the distance R between a detection system and a calibration system and a remote control network connection mode, erecting the detection antenna and the calibration transmitting antenna at the same height, and aligning the horizontal axes of the mouth surfaces of the detection antenna and the calibration transmitting antenna;
the signal editing module of the broadband signal generator is controlled by the calibration control unit to edit the style and parameters of the radio frequency calibration signal, then the radio frequency calibration signal is downloaded to the signal production module, and the edited signal is converted into an actual radio frequency signal by the signal production module and is output; the output radio frequency signal is transmitted to a calibration link control unit through a long cable;
the calibration link control unit receives the calibration signal sent by the broadband signal generation unit, performs signal compensation, calibration channel switching and signal power regulation on the calibration signal, and transmits the calibration signal to a corresponding calibration transmitting antenna;
after receiving the calibration signal processed by the calibration link control unit, the calibration transmitting antenna amplifies the calibration signal, completes spatial radiation and sends the calibration signal to a detection system;
a detection antenna of the detection system receives the calibration signal, and transmits a detection data result to a calibration control unit of the detection main control unit after frequency conversion processing and displays the detection data result in real time;
the calibration control unit checks the actually detected antenna array surface power density and the theoretical value of the antenna array surface power density according to a calibration algorithm to obtain the calibration deviation;
adjusting the deployment distance between the detection system and the calibration system as required to obtain multiple calibration deviations, and solving a calibration deviation root mean square value according to the multiple calibration deviations;
and compensating the calibration deviation root mean square value to a link of the detection system to finish calibration of the whole detection system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125367A (en) * | 2023-03-20 | 2023-05-16 | 中国卫星海上测控部 | Program-controlled timing frequency switching beacon |
| CN116192298A (en) * | 2022-12-30 | 2023-05-30 | 中国航天系统科学与工程研究院 | An Electromagnetic Situational Awareness Evaluation System for Trial Training of Electronic Countermeasure Equipment |
| CN118311490A (en) * | 2023-11-02 | 2024-07-09 | 成都德辰博睿科技有限公司 | Electromagnetic environment monitoring compensation parameter determining method and system |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03295474A (en) * | 1990-04-13 | 1991-12-26 | Maspro Denkoh Corp | Measuring device for output level of reception antenna |
| US5765098A (en) * | 1995-01-02 | 1998-06-09 | Agence Spatiale Europeenne | Method and system for transmitting radio signals between a fixed terrestrial station and user mobile terminals via a network of satellites |
| US6850497B1 (en) * | 1995-09-19 | 2005-02-01 | Mobile Satellite Ventures, Lp | Satellite trunked radio service system |
| CN101090302A (en) * | 2007-07-31 | 2007-12-19 | 中兴通讯股份有限公司 | Self-correction and self-test method formobile terminal and mobile terminal with the method |
| CN101588198A (en) * | 2008-05-19 | 2009-11-25 | 芯通科技（成都）有限公司 | Multi-carrier intelligent antenna calibration intermediate frequency process method and apparatus |
| CN101945417A (en) * | 2010-06-28 | 2011-01-12 | 深圳市华为安捷信电气有限公司 | Method and device for computing gains of multiple receiving links/transmitting links |
| CN102818942A (en) * | 2012-08-24 | 2012-12-12 | 湖北航天技术研究院计量测试技术研究所 | Antenna far-field parameter calibration device and calibration method |
| CN103336192A (en) * | 2013-06-04 | 2013-10-02 | 上海无线电设备研究所 | A low-level scanning current testing system for an aircraft whole body |
| CN104391187A (en) * | 2014-09-18 | 2015-03-04 | 中国人民解放军63892部队 | Alignment calibration device and alignment calibration method of multi-frequency-point antenna array |
| CN104810620A (en) * | 2015-05-21 | 2015-07-29 | 中国电子科技集团公司第三十八研究所 | Non-coherent correction phased array system and method |
| CN105281844A (en) * | 2014-06-30 | 2016-01-27 | 中兴通讯股份有限公司 | Broadband multi-antenna wireless channel measuring system and method thereof |
| CN110149157A (en) * | 2018-02-11 | 2019-08-20 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Array antenna wideband channel parallel calibration method |
| CN110176965A (en) * | 2019-05-23 | 2019-08-27 | 中国科学院国家天文台 | The system and method that a kind of pair of aerial array is calibrated |
| CN110915174A (en) * | 2017-06-26 | 2020-03-24 | 华为技术有限公司 | Correction device and correction method |
-
2020
- 2020-03-26 CN CN202010224329.1A patent/CN111505555B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03295474A (en) * | 1990-04-13 | 1991-12-26 | Maspro Denkoh Corp | Measuring device for output level of reception antenna |
| US5765098A (en) * | 1995-01-02 | 1998-06-09 | Agence Spatiale Europeenne | Method and system for transmitting radio signals between a fixed terrestrial station and user mobile terminals via a network of satellites |
| US6850497B1 (en) * | 1995-09-19 | 2005-02-01 | Mobile Satellite Ventures, Lp | Satellite trunked radio service system |
| CN101090302A (en) * | 2007-07-31 | 2007-12-19 | 中兴通讯股份有限公司 | Self-correction and self-test method formobile terminal and mobile terminal with the method |
| CN101588198A (en) * | 2008-05-19 | 2009-11-25 | 芯通科技（成都）有限公司 | Multi-carrier intelligent antenna calibration intermediate frequency process method and apparatus |
| CN101945417A (en) * | 2010-06-28 | 2011-01-12 | 深圳市华为安捷信电气有限公司 | Method and device for computing gains of multiple receiving links/transmitting links |
| CN102818942A (en) * | 2012-08-24 | 2012-12-12 | 湖北航天技术研究院计量测试技术研究所 | Antenna far-field parameter calibration device and calibration method |
| CN103336192A (en) * | 2013-06-04 | 2013-10-02 | 上海无线电设备研究所 | A low-level scanning current testing system for an aircraft whole body |
| CN105281844A (en) * | 2014-06-30 | 2016-01-27 | 中兴通讯股份有限公司 | Broadband multi-antenna wireless channel measuring system and method thereof |
| CN104391187A (en) * | 2014-09-18 | 2015-03-04 | 中国人民解放军63892部队 | Alignment calibration device and alignment calibration method of multi-frequency-point antenna array |
| CN104810620A (en) * | 2015-05-21 | 2015-07-29 | 中国电子科技集团公司第三十八研究所 | Non-coherent correction phased array system and method |
| CN110915174A (en) * | 2017-06-26 | 2020-03-24 | 华为技术有限公司 | Correction device and correction method |
| CN110149157A (en) * | 2018-02-11 | 2019-08-20 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Array antenna wideband channel parallel calibration method |
| CN110176965A (en) * | 2019-05-23 | 2019-08-27 | 中国科学院国家天文台 | The system and method that a kind of pair of aerial array is calibrated |
Non-Patent Citations (2)
| Title |
|---|
| S MICLAUS,ET AL: "Estimated and measure values of radiofrequency radiation power density around cellular base stations", 《ENVIRONMENT PHYSICS》 * |
| 吴洋: "基于毫米波平面天线的近场辐照系统研究", 《中国优秀硕士学位论文全文数据库 (信息科技辑)》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116192298A (en) * | 2022-12-30 | 2023-05-30 | 中国航天系统科学与工程研究院 | An Electromagnetic Situational Awareness Evaluation System for Trial Training of Electronic Countermeasure Equipment |
| CN116125367A (en) * | 2023-03-20 | 2023-05-16 | 中国卫星海上测控部 | Program-controlled timing frequency switching beacon |
| CN118311490A (en) * | 2023-11-02 | 2024-07-09 | 成都德辰博睿科技有限公司 | Electromagnetic environment monitoring compensation parameter determining method and system |
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