CN114384478B - An automatic calibration system for time delay consistency of phased array time-frequency synchronization distribution - Google Patents

Abstract

The invention relates to the technical field of phased array radar, and in particular to an automatic calibration system for time delay consistency of phased array time-frequency synchronous distribution, comprising an electro-optical unit, an optical power division unit, an operation and maintenance unit and a plurality of array element optoelectronic units; the operation and maintenance unit issues instructions to the electro-optical unit, the optical power division unit and the plurality of array element optoelectronic units; the optoelectronic unit outputs a reference radio frequency signal and performs electro-optical conversion, and after converting a loopback optical signal output by the optical power division unit into a loopback electrical signal, measures the delay difference between the reference radio frequency signal and the loopback electrical signal; the optical power division unit performs delay adjustment on the output reference radio frequency optical signal, and transmits the adjusted adjustment signal to the array element optoelectronic unit at the same time, and amplifies the reflected signal of the array element optoelectronic unit and transmits it to the electro-optical unit as a loopback optical signal; the array element optoelectronic unit reflects the adjustment signal as a reflected signal back to the optical power division unit, thereby solving the problem that the error of the existing delay calibration is large through manual adjustment.

Description

An automatic calibration system for time delay consistency of phased array time-frequency synchronization distribution

Technical Field

The invention relates to the technical field of phased array radars, and in particular to an automatic calibration system for time delay consistency of phased array time-frequency synchronization distribution.

Background Art

The phased array radar array time-frequency signals include the local oscillator signals used to provide the reference synchronization clock and up- and down-conversion for the array T/R components. The current conventional phased array radar system based on RF optical transmission array time-frequency signal distribution system requires in principle that the time delay insertion of each branch to each T/R component should be consistent.

In order to ensure the consistency of the delay of each channel, the current conventional practice is to ensure manual adjustment, that is, to ensure the consistency of the device delay of the branch channel as much as possible during the design, and to use the vector network analyzer to measure and adjust the optical fiber length or the length of the connecting cable of each channel during the equipment debugging to ensure that the delay of all distribution channels is strictly consistent. However, in the face of a large number of array elements and an increasingly long array, the adjustment time span is getting longer and longer. The adjustment accuracy is not only affected by the accuracy of optical fiber cutting and welding, but also by the temperature drift of optical fiber delay, which makes the adjustment error larger and larger, which will cause the adjuster to doubt the adjustment result and lead to repeated adjustment.

Summary of the invention

The purpose of the present invention is to provide a phased array time-frequency synchronization distribution delay consistency automatic calibration system, aiming to solve the problem of large errors in the existing delay calibration through manual adjustment.

To achieve the above-mentioned object, the present invention provides a phased array time-frequency synchronization distribution delay consistency automatic calibration system, including an electro-optical unit, an optical power division unit, an operation and maintenance unit, and a plurality of array element optoelectronic units;

The electro-optical unit is connected to the optical power division unit, a plurality of the array element optoelectronic units are respectively connected to the optical power division unit, and the operation and maintenance unit is connected to the electro-optical unit, the optical power division unit and a plurality of the array element optoelectronic units;

The operation and maintenance unit is used to issue instructions to the electro-optical unit, the optical power division unit and a plurality of the array element optoelectronic units;

The electro-optical unit is used to output a reference radio frequency signal and convert the reference radio frequency signal into a reference radio frequency optical signal for output, and after converting the looped optical signal output by the optical power splitter unit into a looped electrical signal, measure the delay difference between the reference radio frequency signal and the looped electrical signal;

The optical power splitter unit is used to perform time delay adjustment on the output reference radio frequency optical signal, transmit the adjusted signal to the array element optoelectronic unit, and amplify the reflected signal of the array element optoelectronic unit and transmit it to the electro-optical unit as the loopback optical signal;

The array element optoelectronic unit is used to reflect the adjustment signal as the reflection signal back to the optical power splitter unit.

The electro-optical unit includes a two-cut-one RF switch, an electro-optical conversion module, a second optoelectronic conversion module, a first network manager and a delay measurement module. The two-cut-one RF switch, the electro-optical conversion module, the first network manager and the delay measurement module are connected in sequence, the first network manager is connected to the two-cut-one RF switch, and the second optoelectronic conversion module is connected to the delay measurement module and the first network manager.

The first network management unit is configured to control the two-on-one radio frequency switch according to a first control instruction issued by the operation and maintenance unit;

The two-to-one RF switch controls powering on and off of the second photoelectric conversion module and the delay measurement module based on the first control instruction;

The delay measurement module is used to output a reference radio frequency signal and measure the delay difference between the reference radio frequency signal and the loopback electrical signal;

The electro-optical conversion module is used to convert the reference radio frequency signal into a reference radio frequency optical signal;

The second photoelectric conversion module is used to convert the looped optical signal into a looped electrical signal.

The optical power splitter unit includes a first optical amplifier, an optical circulator, a second optical amplifier, a second network management, an optical splitter and a delay adjustment module, wherein the first optical amplifier, the optical circulator, the second optical amplifier and the second network management are connected in sequence, the second optical amplifier is connected to the second photoelectric conversion module, the optical splitter is connected to the optical circulator, and the delay adjustment module is connected to the optical splitter;

The second network management is used to receive the adjustment instruction and the third control instruction issued by the operation and maintenance unit, transmit the adjustment instruction to the delay adjustment module, and control the power on and off of the second optical amplifier based on the third control instruction;

The first optical amplifier is used to amplify the power of the reference radio frequency optical signal to obtain an amplified signal;

The optical circulator is used to transmit the amplified signal to the optical splitter, and transmit the reflected signal reflected by the array element optoelectronic unit to the second optical amplifier;

The optical splitter is used to equally split the amplified signal into a number of branch signals and then transmit them to the delay adjustment module;

The delay adjustment module adjusts the delay amounts of the plurality of branch signals based on the adjustment instruction to obtain a plurality of adjusted optical signals;

The second optical amplifier is used to amplify the reflected signal and transmit the amplified reflected signal as the looped optical signal to the second optoelectronic conversion module.

The array element optoelectronic unit includes a two-optical switch, an optical reflector, a first optoelectronic conversion module and a third network management, the two-optical switch, the first optoelectronic conversion module and the third network management are connected in sequence, and the optical reflector is connected to the two-optical switch;

The third network management unit is used to control the one-to-two optical switch according to the second control instruction issued by the operation and maintenance unit;

The bisection optical switch is used to control the power on and power off of the optical reflector and the first photoelectric conversion module based on the second control instruction;

The first photoelectric conversion module is used to convert the corresponding adjustment optical signal into an adjustment electrical signal and then output it;

The optical reflector is used to totally reflect the reflected signal of the corresponding adjusted optical signal to the optical circulator via the delay adjustment module and the optical splitter.

Wherein, the operation and maintenance unit comprises a monitoring tandem device and a computer, the monitoring tandem device is connected to the first network management, the second network management and the third network management, and the computer is connected to the monitoring tandem device;

The computer is used to input the first control instruction, the second control instruction and the adjustment instruction to the monitoring tandem device;

The monitoring tandem device is used to send the first control instruction to the first network manager, send the second control instruction to the third network manager, and send the adjustment instruction and the third control instruction to the second network manager.

The present invention discloses a phased array time-frequency synchronous distribution delay consistency automatic calibration system. When calibrating the delay consistency of a channel, the delay value of each channel is first measured. Specifically, the electro-optical unit outputs the reference radio frequency signal, the optical power splitter transmits the reference radio frequency signal in an initial unadjusted state to the array element photoelectric unit, the array element photoelectric unit reflects the reflected signal of the reference radio frequency signal to the optical power splitter, the optical power splitter amplifies the reflected signal and transmits it back to the electro-optical unit, obtains the current delay value _T1 , and reports the delay value to the operation and maintenance unit. After receiving the delay value, the operation and maintenance unit controls the output direction of the array element photoelectric unit, thereby measuring the delay value _T2 , _T3 ... _TN of each remaining channel within the calibration range, thereby obtaining the delay value _T1 , _T2 , _T3 ... _TN of each passing channel. and reports all data to the operation and maintenance unit, the operation and maintenance unit selects a calibration reference channel, and records the delay value of the calibration reference channel as T ₀ , and then calculates the experimental difference T _Δ1 , T _Δ2 , T _Δ3 ...T _ΔN-1 of the delay value of each channel, and finally the operation and maintenance unit controls the optical power division unit to accurately adjust the delay difference T _Δ1 , T _Δ2 , T _Δ3 ...T _ΔN-1 for each channel, thereby solving the problem of large errors in the existing delay calibration through manual adjustment.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the structure of a phased array time-frequency synchronization distribution delay consistency automatic calibration system provided by the present invention.

FIG. 2 is a schematic diagram of the structure of an electro-optical unit, a first optical amplifier, a second optical amplifier and a monitoring tandem device.

FIG3 is a schematic diagram of the structures of the optical power splitter unit, the array element optoelectronic unit and the operation and maintenance unit.

FIG. 4 is a schematic diagram of the structure of the delay adjustment module, the array element optoelectronic unit and the monitoring tandem equipment.

1-electro-optical unit, 2-optical power division unit, 3-operation and maintenance unit, 4-array element optoelectronic unit, 5-two-in-one radio frequency switch, 6-electro-optical conversion module, 7-second optoelectronic conversion module, 8-first network management, 9-delay measurement module, 10-first optical amplifier, 11-optical circulator, 12-second optical amplifier, 13-second network management, 14-optical splitter, 15-delay adjustment module, 16-one-in-two optical switch, 17-optical reflector, 18-first optoelectronic conversion module, 19-third network management, 20-monitoring tandem equipment, 21-computer.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

Please refer to Figures 1 to 4, the present invention provides a phased array time-frequency synchronization distribution delay consistency automatic calibration system, including an electro-optical unit 1, an optical power division unit 2, an operation and maintenance unit 3 and a plurality of array element optoelectronic units 4;

The electro-optical unit 1 is connected to the optical power division unit 2, a plurality of the array element optoelectronic units 4 are respectively connected to the optical power division unit 2, and the operation and maintenance unit 3 is connected to the electro-optical unit 1, the optical power division unit 2 and a plurality of the array element optoelectronic units 4;

The operation and maintenance unit 3 is used to issue instructions to the electro-optical unit 1, the optical power division unit 2 and a plurality of the array element optoelectronic units 4;

The electro-optical unit 1 is used to output a reference radio frequency signal and convert the reference radio frequency signal into a reference radio frequency optical signal for output, and after converting the looped optical signal output by the optical power splitter unit 2 into a looped electrical signal, measure the delay difference between the reference radio frequency signal and the looped electrical signal;

The optical power splitter unit 2 is used to adjust the delay of the output reference RF optical signal, transmit the adjusted signal to the array element optoelectronic unit 4, and amplify the reflected signal of the array element optoelectronic unit 4 and transmit it to the electro-optical unit 1 as the loop optical signal;

The array element optoelectronic unit 4 is used to reflect the adjustment signal as the reflection signal back to the optical power splitter unit 2 .

Specifically, when calibrating the delay consistency of the channel, the delay value of each channel is measured first. Specifically, the electro-optical unit 1 outputs the reference RF signal, the optical power splitter unit 2 transmits the reference RF signal in an initial unadjusted state to the array element optoelectronic unit 4, the array element optoelectronic unit 4 reflects the reflected signal of the reference RF signal to the optical power splitter unit 2, the optical power splitter unit 2 amplifies the reflected signal and transmits it back to the electro-optical unit 1, obtains the current delay value T ₁ , and reports the delay value to the operation and maintenance unit 3. After receiving the delay value, the operation and maintenance unit 3 controls the output direction of the array element optoelectronic unit 4, thereby measuring the delay value T ₂ , T ₃ ...T _N of each remaining channel within the calibration range, thereby obtaining the delay value T ₁ , T ₂ , T ₃ ...T _N of each passing channel. , and reports all data to the operation and maintenance unit 3, the operation and maintenance unit 3 selects a calibration reference channel, and records the delay value of the calibration reference channel as T ₀ , then calculates the experimental difference T _Δ1 , T _Δ2 , T _Δ3 ...T _ΔN-1 of the delay value of each channel, and finally the operation and maintenance unit 3 controls the optical power division unit 2 to accurately adjust the delay difference T _Δ1 , T _Δ2 , T _Δ3 ...T _ΔN-1 for each channel. The measurement response time of each link is determined by the transmission time and the signal processing time. The transmission time is mainly determined by the length of the optical link. For example, the transmission delay of 200m optical fiber is about 1us, and the signal processing time is about 100ms. Therefore, the delay measurement response time of each link should also be in the order of hundreds of milliseconds. The delay measurement time of hundreds of channels can be kept within 10s, which can achieve fast and accurate delay measurement. Since the optical delay line uses micro-stepping continuous adjustment controlled by a micro-motor, the conventional adjustment speed is about 40ps/s, and the delay adjustment time is proportional to |TΔ|. Since the deviation is the largest when the system is first calibrated after deployment, it mainly compensates for the delay difference caused by the physical length difference between the channels. The correction range is large. The maximum difference in fiber delay of each channel with a wiring length of 100m with a slight control can be controlled within 500ps (10cm length fiber). Therefore, the maximum single-channel delay correction delay of the first 100m wiring level is about 12.5s, and the average delay correction time is about 6s. Therefore, the first phase calibration time of the hundred-channel level is about 10min. The delay correction timing in the work is mainly caused by the temperature difference of the optical fiber of each channel. Usually, the delay difference is not too large. According to the wiring length of 100m and the temperature difference between the optical fibers of 10℃, the maximum delay difference is 40ps. The delay correction of one channel can be completed within 1s. Therefore, the conventional correction cycle of the 100m-level delay correction of 100 channels is about 100s. This solves the problem of large errors in the existing time delay calibration through manual adjustment. It also eliminates the time delay error caused by uneven construction wiring or ambient temperature.

Further, the electro-optical unit 1 includes a two-cut-one RF switch 5, an electro-optical conversion module 6, a second optoelectronic conversion module 7, a first network management module 8 and a delay measurement module 9, the two-cut-one RF switch 5, the electro-optical conversion module 6, the first network management module 8 and the delay measurement module 9 are connected in sequence, the first network management module 8 is connected to the two-cut-one RF switch 5, and the second optoelectronic conversion module 7 is connected to the delay measurement module 9 and the first network management module 8;

The first network management 8 is used to control the two-to-one radio frequency switch 5 according to the first control instruction issued by the operation and maintenance unit 3;

The two-to-one RF switch 5 controls the power on and off of the second photoelectric conversion module 7 and the delay measurement module 9 based on the first control instruction;

The delay measurement module 9 is used to output a reference radio frequency signal and measure the delay difference between the reference radio frequency signal and the loopback electrical signal;

The electro-optical conversion module 6 is used to convert the reference radio frequency signal into a reference radio frequency optical signal;

The second photoelectric conversion module 7 is used to convert the looped optical signal into a looped electrical signal.

Specifically, the two-cut-one RF switch 5 has two RF input interfaces, one RF output interface, and one control interface. The electro-optical conversion module 6 has one RF input interface, one optical output interface, and one reporting interface. The second photoelectric conversion module 7 has one optical input interface, one RF output interface, and one reporting control interface. The delay measurement module 9 has one reference output interface, one loopback RF input interface, and one reporting control interface. The first network management 8 has four internal monitoring interfaces and one external network management interface. The input interface of the time-frequency signal is connected to the RF input interface of the two-cut-one RF switch 5, and the reference output interface of the delay measurement module 9 is connected to the other RF input interface of the two-cut-one RF switch 5. The RF input interface of the two-to-one RF switch 5 is connected, the RF output interface of the two-to-one RF switch 5 is connected to the RF input interface of the electro-optical conversion module 6, the control interface of the two-to-one RF switch 5 is connected to a monitoring interface of the first network manager 8, the reporting interface of the second optoelectronic conversion module 7 is connected to a monitoring interface of the first network manager 8, the RF output interface of the second optoelectronic conversion module 7 is connected to the loopback RF input interface of the delay measurement module 9, the reporting control interface of the second optoelectronic conversion module 7 is connected to a monitoring interface of the first network manager 8, the reporting control interface of the delay measurement module 9 is connected to a monitoring port of the first network manager 8, and the external network management interface of the first network manager 8 is connected to the operation and maintenance unit 3.

Further, the optical power splitter unit 2 includes a first optical amplifier 10, an optical circulator 11, a second optical amplifier 12, a second network manager 13, an optical splitter 14 and a delay adjustment module 15, the first optical amplifier 10, the optical circulator 11, the second optical amplifier 12 and the second network manager 13 are connected in sequence, the second optical amplifier 12 is connected to the second optoelectronic conversion module 7, the optical splitter 14 is connected to the optical circulator 11, and the delay adjustment module 15 is connected to the optical splitter 14;

The second network management 13 is used to receive the adjustment instruction and the third control instruction issued by the operation and maintenance unit 3, and transmit the adjustment instruction to the delay adjustment module 15, and control the power on and off of the second optical amplifier 12 based on the third control instruction;

The first optical amplifier 10 is used to amplify the power of the reference radio frequency optical signal to obtain an amplified signal;

The optical circulator 11 is used to transmit the amplified signal to the optical splitter 14, and transmit the reflected signal reflected by the array element optoelectronic unit 4 to the second optical amplifier 12;

The optical splitter 14 is used to equally split the amplified signal into a number of branch signals and then transmit them to the delay adjustment module 15;

The delay adjustment module 15 adjusts the delay amounts of the plurality of branch signals based on the adjustment instruction to obtain a plurality of adjusted optical signals;

The second optical amplifier 12 is used to amplify the reflected signal and transmit the amplified reflected signal as the looped optical signal to the second optoelectronic conversion module 7 .

Specifically, the first optical amplifier 10 has 1 optical input interface, 1 optical output interface, and 1 reporting control interface, the optical circulator 11 has 3 ports, namely, a first optical port, a second optical port, and a third optical port, the second optical amplifier 12 has 1 optical input interface, 1 optical output interface, and 1 reporting control interface, the optical splitter 14 has 1 optical input interface and several optical output interfaces, the channel delay adjustment module 15 mainly has several optical input interfaces and several optical output interfaces, the second network management 13 has 3 internal monitoring interfaces and 1 external network management interface and 1 reporting control interface, the optical output interface of the electro-optical conversion module 6 is connected to the optical input interface of the first optical amplifier 10, the reporting control interface of the first optical amplifier 10 is connected to the monitoring interface of the second network management 13, the first optical port of the optical circulator 11 is connected to the optical output interface of the first optical amplifier 10, the second optical port of the optical circulator 11 is connected to the optical input interface of the optical splitter 14, the optical circulator The third optical port of 11 is connected to the input optical interface of the second optical amplifier 12, the reporting control interface of the second optical amplifier 12 is connected to a monitoring interface of the second network manager 13, the optical output interface of the second optical amplifier 12 is connected to an optical input interface of the second optoelectronic conversion module 7, and several optical output interfaces of the optical splitter 14 are respectively connected to several optical input interfaces of the channel delay adjustment module 15 through short jump fibers, and the reporting control interface of the channel delay adjustment module 15 is connected to a monitoring interface of the second network manager 13. Its main function is to accept the delay adjustment information issued by the second network manager 13 and adjust the delay on the specified path. The core of the delay adjustment module 15 is the continuously adjustable optical delay line based on micro-motor drive of several channels inside it. The delay adjustment accuracy is higher than 1ps, and the total delay range is determined according to the correction deviation capacity. The optical delay line with a suitable range can be selected in 100ps-5ns; the external network management interface of the second network manager 13 is connected to the operation and maintenance unit 3.

Further, the array element optoelectronic unit 4 includes a two-optical switch 16, a light reflector 17, a first optoelectronic conversion module 18 and a third network management 19, the two-optical switch 16, the first optoelectronic conversion module 18 and the third network management 19 are connected in sequence, and the light reflector 17 is connected to the two-optical switch 16;

The third network management unit 19 is used to control the two-cut optical switch 16 according to the second control instruction issued by the operation and maintenance unit 3;

The bisection optical switch 16 is used to control the power on and power off of the optical reflector 17 and the first photoelectric conversion module 18 based on the second control instruction;

The first photoelectric conversion module 18 is used to convert the corresponding adjustment optical signal into an adjustment electrical signal and then output it;

The optical reflector 17 is used to totally reflect the reflected signal of the corresponding adjusted optical signal to the optical circulator 11 via the delay adjustment module 15 and the optical splitter 14 .

Specifically, the one-to-two optical switch 16 has one input optical port, two output optical ports, and one control interface; the first optoelectronic conversion module 18 has one optical input interface, one radio frequency output interface, and one reporting control interface; the optical reflector 17 has only one optical interface; the third network manager 19 has two monitoring interfaces and one external network manager interface; the input optical port of the one-to-two optical switch 16 is connected to several optical output interfaces of the channel delay adjustment module 15 and their corresponding optical output interfaces; the two output optical ports of the one-to-two optical switch 16 are respectively connected to the optical interface of the optical reflector 17 and the optical input interface of the first optoelectronic conversion module 18; the control interface of the one-to-two optical switch 16 is connected to one monitoring interface of the third network manager 19; the radio frequency output interface of the first optoelectronic conversion module 18 is the output interface of the adjustment signal; the reporting control interface of the one-to-two optical switch 16 is connected to a monitoring interface of the third network manager 19; and some external network management interfaces of the third network manager 19 are connected to the operation and maintenance unit 3.

Further, the operation and maintenance unit 3 includes a monitoring tandem device 20 and a computer 21, the monitoring tandem device 20 is connected to the first network management 8, the second network management 13 and the third network management 19, and the computer 21 is connected to the monitoring tandem device 20;

The computer 21 is used to input the first control instruction, the second control instruction and the adjustment instruction to the monitoring tandem device 20;

The monitoring tandem device 20 is used to send the first control instruction to the first network manager 8 , send the second control instruction to the third network manager 19 , and send the adjustment instruction and the third control instruction to the second network manager 13 .

Specifically, the monitoring tandem device 20 has a plurality of +2 monitoring interfaces and interactive interfaces, which are respectively connected to the external network management interfaces of the third network management 19 of a plurality of the array element optoelectronic units 4, the external network management interfaces of the first network management 8 and the external network management interfaces of the second network management 13, and the interactive interface of the monitoring tandem device 20 is connected to the computer 21.

When calibrating the delay consistency, the monitoring tandem device 20 sends the first control instruction through the first network management 8, the two-cut-one radio frequency switch 5 powers on the delay measurement module 9 and the electro-optical conversion module 6 based on the first control instruction, and controls the radio frequency input interface of the two-cut-one radio frequency switch 5 connected to the input interface of the time-frequency signal to be disconnected, the monitoring tandem device 20 sends the third control instruction through the second network management 13 to control the second optical amplifier 12 to be powered on, the delay adjustment module 15 is in the delay holding state, and the three-cut-two optical switch 16 is controlled to switch to the optical reflector 17 through the third network management 19, the delay measurement module 9 outputs a reference radio frequency signal, and the electro-optical conversion module 6 converts the reference radio frequency signal into the reference radio frequency signal. The first optical amplifier converts the reference RF optical signal into an electrical signal, and outputs the reference RF optical signal from the first optical port of the optical circulator 11 through the second optical port to the optical splitter 14 through the delay adjustment module 15 to the optical reflector 17. The optical reflector 17 totally reflects the reference RF optical signal as a reflected signal through the delay adjustment module 15 and the optical splitter 14 to the second optical port of the optical circulator 11, and transmits the reflected signal to the second optical amplifier 12 through the third optical port. The second optical amplifier 12 amplifies the reflected signal and transmits it to the second photoelectric conversion module 7 as a loopback optical signal. The second photoelectric conversion module 7 converts the loopback optical signal into a loopback electrical signal. The delay measurement module 9 measures the delay value T of the current channel based on the loopback electrical signal. ₁ , and reports the delay value to the monitoring tandem device 20 of the operation and maintenance unit 3 through the first network management 8. After receiving the data, the monitoring tandem device 20 sends the second adjustment instruction through the third network management 19. The split optical switch 16 switches to the first optoelectronic conversion module 18 based on the second adjustment instruction until the delay measurement of the current link is completed. After that, the monitoring tandem device 20 automatically controls the output direction of the split optical switch 16 inside the array element optoelectronic unit 4 in the selected channel, thereby measuring the delay value T ₂ , T ₃ ...T _N of each of the remaining channels within the calibration range. The monitoring tandem device 20 of the operation and maintenance unit 3 selects a calibration reference channel, and records the delay value of the calibration reference channel as T ₀ , and then calculates the experimental difference value T _Δ1 , T _Δ2 , T _Δ3 ...T _ΔN-1 of the delay value of each channel Finally, the monitoring tandem device 20 of the operation and maintenance unit 3 sends the adjustment instruction to the delay adjustment module 15 through the second network management 13, and the delay adjustment module 15 accurately adjusts the delay difference of T _Δ1 , T _Δ2 , T _Δ3 ...T _{ΔN-1 for} each pass based on the adjustment instruction.

When transmitting the signal, the monitoring tandem device 20 sends the first control instruction through the first network management 8, the two-to-one radio frequency switch 5 connects the input interface of the time-frequency signal with the electro-optical conversion module 6 based on the first control instruction, and controls the delay measurement module 9 and the second photoelectric conversion module 7 to be powered off, the monitoring tandem device 20 sends the third control instruction to the second network management 13, the second network management 13 controls the second optical amplifier 12 to be powered off based on the third control instruction, the monitoring tandem device 20 sends the second control instruction through the third network management 19, the two-to-one optical switch 16 switches to the first photoelectric conversion module 18 based on the second control instruction, and the output time-frequency signal is transmitted to the first photoelectric conversion module 18 through the electro-optical conversion module 7. 6 is converted into a second optical signal, the first optical amplifier 10 amplifies the second optical signal, and the amplified second amplified signal is output to the optical splitter 14 through the first optical port of the optical circulator 11 and the second optical port, and the optical splitter 14 divides the second amplified signal into a plurality of second branch signals and outputs them to the delay adjustment module 15, the delay adjustment module 15 includes a plurality of channels of reconfigurable optical delay lines, the state of the delay adjustment module 15 in the delay holding state remains in the state after the last adjustment, and the plurality of second branch signals are output to the first optoelectronic conversion module 18 of each of the array element optoelectronic units 4 through a plurality of optical fibers, and the first optoelectronic conversion module 18 converts the corresponding second branch signals into electrical signals and outputs them.

The above disclosure is only a preferred embodiment of the phased array time-frequency synchronization distribution delay consistency automatic calibration system of the present invention. Of course, this cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention are still within the scope of the invention.

Claims (2)

1. A phased array time-frequency synchronization distribution delay consistency automatic calibration system, characterized by comprising an electro-optical unit, an optical power distribution unit, an operation and maintenance unit and a plurality of array element optoelectronic units; The electro-optical unit is connected to the optical power division unit, a plurality of the array element optoelectronic units are respectively connected to the optical power division unit, and the operation and maintenance unit is connected to the electro-optical unit, the optical power division unit and a plurality of the array element optoelectronic units; The operation and maintenance unit is used to issue instructions to the electro-optical unit, the optical power division unit and a plurality of the array element optoelectronic units; The electro-optical unit is used to output a reference radio frequency signal and convert the reference radio frequency signal into a reference radio frequency optical signal for output, and after converting the looped optical signal output by the optical power splitter unit into a looped electrical signal, measure the delay difference between the reference radio frequency signal and the looped electrical signal; The optical power splitter unit is used to perform time delay adjustment on the output reference radio frequency optical signal, transmit the adjusted adjustment signal to the array element optoelectronic unit, and amplify the reflected optical signal of the array element optoelectronic unit and transmit it to the electro-optical unit as the loop optical signal; The array element optoelectronic unit is used to reflect the adjustment signal as the reflected light signal back to the optical power splitter unit; The electro-optical unit comprises a two-cut-one radio frequency switch, an electro-optical conversion module, a second photoelectric conversion module, a first network management module and a delay measurement module, wherein the two-cut-one radio frequency switch, the electro-optical conversion module, the first network management module and the delay measurement module are connected in sequence, the first network management module is connected to the two-cut-one radio frequency switch, and the second photoelectric conversion module is connected to the delay measurement module and the first network management module; The first network management unit is configured to control the two-on-one radio frequency switch according to a first control instruction issued by the operation and maintenance unit; The two-to-one RF switch controls powering on and off of the second photoelectric conversion module and the delay measurement module based on the first control instruction; The delay measurement module is used to output a reference radio frequency signal and measure the delay difference between the reference radio frequency signal and the loopback electrical signal; The electro-optical conversion module is used to convert the reference radio frequency signal into a reference radio frequency optical signal; The second photoelectric conversion module is used to convert the looped optical signal into a looped electrical signal; The optical power splitter unit comprises a first optical amplifier, an optical circulator, a second optical amplifier, a second network management, an optical splitter and a delay adjustment module, wherein the first optical amplifier, the optical circulator, the second optical amplifier and the second network management are connected in sequence, the second optical amplifier is connected to the second photoelectric conversion module, the optical splitter is connected to the optical circulator, and the delay adjustment module is connected to the optical splitter; The second network management is used to receive the adjustment instruction and the third control instruction issued by the operation and maintenance unit, transmit the adjustment instruction to the delay adjustment module, and control the power on and off of the second optical amplifier based on the third control instruction; The first optical amplifier is used to amplify the power of the reference radio frequency optical signal to obtain an amplified signal; The optical circulator is used to transmit the amplified signal to the optical splitter, and transmit the reflected light signal reflected by the array element optoelectronic unit to the second optical amplifier; The optical splitter is used to equally split the amplified signal into a number of branch signals and then transmit them to the delay adjustment module; The delay adjustment module adjusts the delay amounts of the plurality of branch signals based on the adjustment instruction to obtain a plurality of adjusted optical signals; The second optical amplifier is used to amplify the reflected optical signal and transmit it to the second optoelectronic conversion module as the looped optical signal; The array element optoelectronic unit comprises a two-optical switch, an optical reflector, a first optoelectronic conversion module and a third network management, wherein the two-optical switch, the first optoelectronic conversion module and the third network management are connected in sequence, and the optical reflector is connected to the two-optical switch; The third network management unit is used to control the one-to-two optical switch according to the second control instruction issued by the operation and maintenance unit; The bisection optical switch is used to control the power on and power off of the optical reflector and the first photoelectric conversion module based on the second control instruction; The first photoelectric conversion module is used to convert the corresponding adjustment optical signal into an adjustment electrical signal and then output it; The optical reflector is used to totally reflect the reflected optical signal corresponding to the adjusted optical signal to the optical circulator via the delay adjustment module and the optical splitter. 2. The phased array time-frequency synchronization distribution delay consistency automatic calibration system according to claim 1, characterized in that: The operation and maintenance unit includes a monitoring tandem device and a computer, wherein the monitoring tandem device is connected to the first network management, the second network management and the third network management, and the computer is connected to the monitoring tandem device; The computer is used to input the first control instruction, the second control instruction and the adjustment instruction to the monitoring tandem device; The monitoring tandem device is used to send the first control instruction to the first network manager, send the second control instruction to the third network manager, and send the adjustment instruction and the third control instruction to the second network manager.