CN114384478A - Automatic calibration system for phased array time frequency synchronous distribution time delay consistency - Google Patents
Automatic calibration system for phased array time frequency synchronous distribution time delay consistency Download PDFInfo
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The invention relates to the technical field of phased array radars, in particular to an automatic calibration system for phased array time-frequency synchronous distribution time delay consistency, which comprises an electro-optical unit, an optical power division unit, an operation and maintenance unit and a plurality of array element photoelectric units, wherein the electro-optical unit is used for receiving a plurality of array element time-frequency synchronous distribution time delay consistencies; the operation and maintenance unit issues instructions to the electro-optical unit, the optical power division unit and the array element electro-optical units; the photoelectric unit outputs a reference radio frequency signal and performs electro-optical conversion, and measures the time delay difference between the reference radio frequency signal and a loop electric signal after converting the loop optical signal output by the optical power dividing unit into the loop electric signal; the optical power division unit performs time delay adjustment on the output reference radio frequency optical signal, transmits the adjusted adjustment signal to the array element photoelectric unit, amplifies a reflection signal of the array element photoelectric unit and transmits the amplified reflection signal as a loop optical signal to the electro-optical unit; the array element photoelectric unit reflects the adjusting signal as a reflection signal back to the optical power division unit, and the problem that the error of the existing time delay calibration is large through manual adjustment is solved.
Description
Technical Field
The invention relates to the technical field of phased array radars, in particular to an automatic calibration system for phased array time-frequency synchronous distribution time delay consistency.
Background
The phased array radar array surface time frequency signal comprises a local oscillator signal which is used for providing a reference synchronous clock and is needed by up-down frequency conversion for the array surface T/R assembly, and the time frequency signal time delay insertion of each branch to each T/R assembly is required to be consistent in principle by the conventional phased array radar system of the array surface time frequency signal distribution system based on radio frequency optical transmission at present.
In order to ensure the time delay consistency of each channel, the conventional method at present is to ensure manual calibration, that is, to ensure the time delay consistency of the devices of the branch channels as much as possible during design, and to cooperate with a vector network analyzer to measure and adjust the length of the optical fiber or the length of the connecting cable of each channel during equipment debugging, to ensure the strict consistency of the time delays of all distribution channels, but to face the large array surface and the longer and longer array elements, the calibration time span is longer and longer, the calibration precision is not only affected by the precision of optical fiber cutting and welding, but also affected by the temperature drift of the optical fiber time delay, so that the calibration error is larger and larger, and the calibration personnel can doubtful the calibration result and cause repeated calibration.
Disclosure of Invention
The invention aims to provide an automatic calibration system for phased array time-frequency synchronous distribution time delay consistency, and aims to solve the problem that the existing time delay calibration has large error through manual calibration.
In order to achieve the purpose, the invention provides an automatic calibration system for phased array time-frequency synchronous distribution time delay consistency, which comprises an electro-optical unit, an optical power division unit, an operation and maintenance unit and a plurality of array element photoelectric units, wherein the electro-optical unit is used for receiving a plurality of array element signals;
the electro-optical unit is connected with the optical power division unit, the array element photoelectric units are respectively connected with the optical power division unit, and the operation and maintenance unit is connected with the electro-optical unit, the optical power division unit and the array element photoelectric units;
the operation and maintenance unit is used for issuing instructions to the electro-optical unit, the optical power division unit and the array element photoelectric units;
the electro-optical unit is configured to output a reference radio frequency signal, convert the reference radio frequency signal into a reference radio frequency optical signal, output the reference radio frequency optical signal, convert a loop optical signal output by the optical power division unit into a loop electrical signal, and measure a time delay difference between the reference radio frequency signal and the loop electrical signal;
the optical power division unit is configured to perform delay adjustment on the output reference radio frequency optical signal, transmit an adjusted adjustment signal to the array element photoelectric unit, and amplify a reflected signal of the array element photoelectric unit to transmit the amplified signal to the electro-optical unit as the optical return signal;
and the array element photoelectric unit is used for reflecting the adjusting signal as the reflection signal to the optical power division unit.
The electro-optical unit comprises a two-to-one radio frequency switch, an electro-optical conversion module, a second photoelectric conversion module, a first network management and a time delay measurement module, wherein the two-to-one radio frequency switch, the electro-optical conversion module, the first network management and the time delay measurement module are sequentially connected, the first network management is connected with the two-to-one radio frequency switch, and the second photoelectric conversion module is connected with the time delay measurement module and the first network management;
the first network manager is used for controlling the two-switch one-radio frequency switch according to a first control instruction issued by the operation and maintenance unit;
the second-switching-one radio frequency switch controls the second photoelectric conversion module and the time delay measurement module to be powered on and powered off based on the first control instruction;
the time delay measuring module is used for outputting a reference radio frequency signal and measuring the time delay difference between the reference radio frequency signal and the loop electric signal;
the electro-optical conversion module is used for converting the reference radio frequency signal into a reference radio frequency optical signal;
and the second photoelectric conversion module is used for converting the loop back optical signal into a loop back electrical signal.
The optical power division unit comprises a first optical amplifier, an optical circulator, a second optical amplifier, a second network manager, an optical splitter and a time delay adjusting module, wherein the first optical amplifier, the optical circulator, the second optical amplifier and the second network manager are sequentially connected, the second optical amplifier is connected with the second photoelectric conversion module, the optical splitter is connected with the optical circulator, and the time delay adjusting module is connected with the optical splitter;
the second network manager is configured to receive an adjustment instruction and a third control instruction issued by the operation and maintenance unit, transmit the adjustment instruction to the delay adjustment module, and control power-on and power-off of the second optical amplifier based on the third control instruction;
the first optical amplifier is used for amplifying the power of the reference radio frequency optical signal to obtain an amplified signal;
the optical circulator is used for transmitting the amplified signal to the optical splitter and transmitting the reflected signal reflected by the array element photoelectric unit to the second optical amplifier;
the optical splitter is used for equally dividing the amplified signal into a plurality of split signals and transmitting the split signals to the time delay adjusting module;
the time delay adjusting module adjusts the time delay amount of the plurality of shunt signals based on the adjusting instruction to obtain a plurality of adjusting optical signals;
and the second optical amplifier is used for amplifying the reflected signal and then transmitting the amplified reflected signal as the loop optical signal to the second photoelectric conversion module.
The array element photoelectric unit comprises all two optical switches, a light reflector, a first photoelectric conversion module and a third network management, wherein all the two optical switches, the first photoelectric conversion module and the third network management are sequentially connected, and the light reflector is connected with all the two optical switches;
the third network manager is used for controlling all the second optical switches according to a second control instruction issued by the operation and maintenance unit;
the all-two optical switch is used for controlling the power-on and power-off of the light reflector and the first photoelectric conversion module based on the second control instruction;
the first photoelectric conversion module is used for converting the corresponding adjusting optical signal into an adjusting electrical signal and outputting the adjusting electrical signal;
and the light reflector is used for totally reflecting the corresponding reflection signal of the adjusted optical signal to the optical circulator through the time delay adjusting module and the optical splitter.
The operation and maintenance unit comprises monitoring tandem equipment and a computer, wherein the monitoring tandem equipment is connected with the first network manager, the second network manager and the third network manager, and the computer is connected with the monitoring tandem equipment;
the computer is used for inputting the first control instruction, the second control instruction and the adjusting instruction to the monitoring tandem equipment;
the monitoring tandem device is configured to issue the first control instruction to the first network manager, issue the second control instruction to a third network manager, and issue the adjustment instruction and the third control instruction to the second network manager.
The invention discloses an automatic calibration system for phased array time-frequency synchronous distribution time delay consistency, which measures time delay values of each channel when calibrating the time delay consistency of the channels, specifically, an electro-optical unit outputs a reference radio-frequency signal, an optical power division unit transmits the reference radio-frequency signal in an initial unadjusted state to an array element photoelectric unit, the array element photoelectric unit reflects a reflection signal of the reference radio-frequency signal to the optical power division unit, and the optical power division unit amplifies the reflection signal and then transmits the reflection signal back to the electro-optical unit to obtain a current time delay value T1And reporting the delay value to the operation and maintenance unit, and after receiving the delay value, the operation and maintenance unit controls the output direction of the array element photoelectric unit so as to measure the delay value T of each of the rest channels in the calibration range2、T3...TNTo obtain the delay value T of each pass1、T2、T3...TNReporting all data to the operation and maintenance unit, selecting a calibration reference channel by the operation and maintenance unit, and recording the time delay value of the calibration reference channel as T0Then calculating the experimental difference T of the time delay value of each channelΔ1、TΔ2、TΔ3...TΔN-1Finally, the operation and maintenance unit controls the optical power division unit to perform T on each passΔ1、TΔ2、TΔ3...TΔN-1The problem that the error of the conventional time delay calibration is large through manual adjustment is solved by the accurate adjustment of the time delay difference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an automatic calibration system for phased array time-frequency synchronization distribution time delay consistency provided by the invention.
Fig. 2 is a schematic structural diagram of an electro-optical unit, a first optical amplifier, a second optical amplifier, and a monitoring junction device.
Fig. 3 is a schematic structural diagram of the optical power division unit, the array element photoelectric unit and the operation and maintenance unit.
Fig. 4 is a schematic structural diagram of the delay adjusting module, the array element photoelectric unit and the monitoring tandem device.
The system comprises an electro-optical unit 1, an electro-optical power division unit 2, an operation and maintenance unit 3, an array element 4, an array element electro-optical unit 5, a two-way radio frequency switch 6, an electro-optical conversion module 7, a second electro-optical conversion module 8, a first network management 8, a time delay measurement module 9, a first optical amplifier 10, an optical circulator 11, a second optical amplifier 12, a second network management 13, an optical splitter 14, a time delay adjustment module 15, a two-way optical switch 16, a light reflector 17, a first electro-optical conversion module 18, a third network management 19, a monitoring junction device 20 and a computer 21.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1 to 4, the present invention provides an automatic calibration system for phased array time-frequency synchronization distribution time delay consistency, which includes an electro-optical unit 1, an optical power distribution unit 2, an operation and maintenance unit 3, and a plurality of array element electro-optical units 4;
the electro-optical unit 1 is connected with the optical power division unit 2, the plurality of array element photoelectric units 4 are respectively connected with the optical power division unit 2, and the operation and maintenance unit 3 is connected with the electro-optical unit 1, the optical power division unit 2 and the plurality of array element photoelectric units 4;
the operation and maintenance unit 3 is configured to issue instructions to the electro-optical unit 1, the optical power division unit 2, and the array element photoelectric units 4;
the electro-optical unit 1 is configured to output a reference radio frequency signal, convert the reference radio frequency signal into a reference radio frequency optical signal, output the reference radio frequency optical signal, convert a loop optical signal output by the optical power division unit 2 into a loop electrical signal, and measure a time delay difference between the reference radio frequency signal and the loop electrical signal;
the optical power dividing unit 2 is configured to perform delay adjustment on the output reference radio frequency optical signal, transmit an adjusted adjustment signal to the array element photoelectric unit 4, and amplify a reflected signal of the array element photoelectric unit 4 to transmit the amplified signal to the electro-optical unit 1 as the optical signal of the loop;
the array element photoelectric unit 4 is configured to reflect the adjustment signal back to the optical power dividing unit 2 as the reflection signal.
Specifically, when calibrating the time delay consistency of the channels, the time delay value of each channel is measured, specifically, the electro-optical unit 1 outputs the reference radio frequency signal, the optical power dividing unit 2 transmits the reference radio frequency signal in an initial unadjusted state to the array element photoelectric unit 4, the array element photoelectric unit 4 reflects the reflected signal of the reference radio frequency signal to the optical power dividing unit 2, and the optical power dividing unit 2 amplifies the reflected signal and then transmits the amplified reflected signal back to the electro-optical unit 1 to obtain the current time delay value T1And reporting the delay value to the operation and maintenance unit 3, and after receiving the delay value, the operation and maintenance unit 3 performs processing on the arrayThe output direction of the element photoelectric unit 4 is controlled so that the delay value T of each of the remaining channels in the calibration range is measured2、T3...TNTo obtain the delay value T of each pass1、T2、T3...TNReporting all data to the operation and maintenance unit 3, selecting a calibration reference channel by the operation and maintenance unit 3, and recording a time delay value of the calibration reference channel as T0Then calculating the experimental difference T of the time delay value of each channelΔ1、TΔ2、TΔ3...TΔN-1Finally, the operation and maintenance unit 3 controls the optical power division unit 2 to perform T on each passΔ1、TΔ2、TΔ3...TΔN-1The delay difference is accurately adjusted, 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 a 200m optical fiber is about 1us, and the signal processing time is about 100ms, so the delay measurement response time of each link is also in the order of hundreds of milliseconds, the delay measurement time of a hundred channels can be kept within 10s, and rapid and accurate delay measurement can be realized. Because the optical delay line adopts micro-stepping continuous adjustment controlled by a micro-computer, the conventional adjustment speed is about 40ps/s, the delay adjustment time is in direct proportion to | T delta |, the maximum deviation of the system during first correction after deployment is mainly compensated for the delay difference caused by the physical length difference among channels, the correction range is large, the maximum difference of the optical fiber delay of each channel of the conventional slightly-controlled wiring length of 100m can be controlled within 500ps (10cm length optical fiber), the maximum single-channel delay correction time of the first 100m wiring magnitude is about 12.5s, the average delay correction time is about 6s, and the first phase correction time of the hundred-channel magnitude is about 10 min. The delay correction time in work is mainly caused by the temperature difference of optical fibers of all channels, generally, the delay difference is not too large, the maximum delay difference is 40ps according to the wiring length of 100m and the temperature difference between the optical fibers of 10 ℃, and the delay correction of 1 channel can be completed within 1s, so that the conventional work correction period of the 100 m-grade hundred-channel delay correction is about 100 s. Solves the problem that the existing time delay calibration is mistaken by manual adjustmentThe difference is a big problem. And time delay errors caused by construction wiring or uneven use environment temperature are eliminated.
Further, the electro-optical unit 1 includes a two-to-one radio frequency switch 5, an electro-optical conversion module 6, a second photoelectric conversion module 7, a first network management 8 and a time delay measurement module 9, the two-to-one radio frequency switch 5, the electro-optical conversion module 6, the first network management 8 and the time delay measurement module 9 are connected in sequence, the first network management 8 is connected with the two-to-one radio frequency switch 5, and the second photoelectric conversion module 7 is connected with the time delay measurement module 9 and the first network management 8;
the first network manager 8 is configured to control the second-to-first radio frequency switch 5 according to a first control instruction issued by the operation and maintenance unit 3;
the second-switching-one radio frequency switch 5 controls the second photoelectric conversion module 7 and the time delay measurement module 9 to be powered on and powered off based on the first control instruction;
the delay measuring module 9 is configured to output a reference radio frequency signal, and measure a delay difference between the reference radio frequency signal and the loop electrical signal;
the electro-optical conversion module 6 is configured to convert the reference radio frequency signal into a reference radio frequency optical signal;
the second photoelectric conversion module 7 is configured to convert the loop back optical signal into a loop back electrical signal.
Specifically, the two-switch one-radio frequency switch 5 has 2 radio frequency input interfaces, 1 radio frequency output interface, and 1 control interface, the electro-optical conversion module 6 has 1 radio frequency input interface, 1 optical output interface, and 1 reporting interface, the second photoelectric conversion module 7 has 1 optical input interface, 1 radio frequency output interface, and 1 reporting control interface, the delay measurement module 9 has 1 reference output interface, 1 loop radio frequency input interface, and 1 reporting control interface, the first network management system 8 has 4 internal monitoring interfaces and 1 external network management interface, the input interface of the time-frequency signal and the radio frequency input interface of the two-switch one-radio frequency switch 5, the reference output interface of the delay measurement module 9 is connected with the other radio frequency input interface of the two-switch one-radio frequency switch 5, the radio frequency output interface of the two-switch one-radio frequency switch 5 is connected with the radio frequency input interface of the two-switch one-radio frequency electro-optical conversion module 6, the control interface of the two-switch one-radio frequency switch 5 is connected with 1 monitoring interface of the first network management 8, the reporting interface of the second photoelectric conversion module 7 is connected with 1 monitoring interface of the first network management 8, the radio frequency output interface of the second photoelectric conversion module 7 is connected with the loopback radio frequency input interface of the time delay measurement module 9, the reporting control interface of the second photoelectric conversion module 7 is connected with 1 monitoring interface of the first network management 8, the reporting control interface of the time delay measurement module 9 is connected with 1 monitoring interface of the first network management 8, and the first network management 8 is connected with the external network management interface to the operation and maintenance unit 3.
Further, the optical power dividing unit 2 includes a first optical amplifier 10, an optical circulator 11, a second optical amplifier 12, a second network management 13, an optical splitter 14, and a delay adjusting module 15, where the first optical amplifier 10, the optical circulator 11, the second optical amplifier 12, and the second network management 13 are sequentially connected, the second optical amplifier 12 is connected to the second photoelectric conversion module 7, the optical splitter 14 is connected to the optical circulator 11, and the delay adjusting module 15 is connected to the optical splitter 14;
the second network manager 13 is configured to receive an adjustment instruction and a third control instruction issued by the operation and maintenance unit 3, transmit the adjustment instruction to the delay adjustment module 15, and control the second optical amplifier 12 to be powered on and powered off based on the third control instruction;
the first optical amplifier 10 is configured to amplify the power of the reference radio frequency optical signal to obtain an amplified signal;
the optical circulator 11 is configured 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 configured to equally divide the amplified signal into a plurality of split signals and transmit the split signals to the delay adjusting module 15;
the delay adjusting module 15 adjusts the delay amount of the plurality of branch signals based on the adjusting instruction to obtain a plurality of adjusting optical signals;
the second optical amplifier 12 is configured to amplify the reflected signal and transmit the amplified reflected signal as the loop optical signal to the second photoelectric 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, which are respectively 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 adjusting module 15 mainly has several optical input interfaces and several optical output interfaces, the second network management 13 has 3 internal monitoring interfaces, 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, and the reporting control interface of the first optical amplifier 10 is connected to the 1 monitoring interface of the second network management 13, a first optical port of the optical circulator 11 is connected to an optical output interface of the first optical amplifier 10, a second optical port of the optical circulator 11 is connected to an optical input interface of the optical splitter 14, a third optical port of the optical circulator 11 is connected to an input optical interface of the second optical amplifier 12, a reporting control interface of the second optical amplifier 12 is connected to 1 monitoring interface of the second network manager 13, an optical output interface of the second optical amplifier 12 is connected to one optical input interface of the second photoelectric conversion module 7, a plurality of optical output interfaces of the optical splitter 14 are respectively connected to a plurality of optical input interfaces of the channel delay adjusting module 15 through short-hop fibers, a reporting control interface of the channel delay adjusting module 15 is connected to 1 monitoring interface of the second network manager 13, and the main function of the optical circulator is to receive delay adjusting information issued by the second network manager 13, the delay amount on the designated path is adjusted, the core of the delay adjusting module 15 is a continuous adjustable optical delay line based on micromotor drive of a plurality of channels in the delay adjusting module, the delay adjusting precision is higher than 1ps, the total delay range is determined according to the correction deviation capacity, and the optical delay line with the proper range can be selected in 100ps-5 ns; the external network management interface of the second network management 13 is connected to the operation and maintenance unit 3.
Further, the array element photoelectric unit 4 includes a second-cut optical switch 16, a light reflector 17, a first photoelectric conversion module 18 and a third network management 19, the second-cut optical switch 16, the first photoelectric conversion module 18 and the third network management 19 are sequentially connected, and the light reflector 17 is connected with the second-cut optical switch 16;
the third network management 19 is configured to control all the second optical switches 16 according to a second control instruction issued by the operation and maintenance unit 3;
the all-second optical switch 16 is used for controlling the power-on and power-off of the light reflector 17 and the first photoelectric conversion module 18 based on the second control instruction;
the first photoelectric conversion module 18 is configured to convert the corresponding adjustment optical signal into an adjustment electrical signal and output the adjustment electrical signal;
the optical reflector 17 is configured to totally reflect the corresponding reflection signal of the adjusted optical signal to the optical circulator 11 through the delay adjusting module 15 and the optical splitter 14.
Specifically, the all-two optical switch 16 has 1 input optical port, 2 output optical ports, and 1 control interface, the first photoelectric conversion module 18 has 1 optical input interface, 1 radio frequency output interface, and 1 reporting control interface, the optical reflector 17 has only 1 optical interface, the third network management 19 has 2 monitoring interfaces and 1 external network management interface, the input optical ports of all-two optical switches 16 are connected to the plurality of optical output interfaces of the channel delay adjustment module 15 and the corresponding optical output interfaces thereof, the 2 output optical ports of all-two optical switches 16 are respectively connected to the optical interface of the optical reflector 17 and the optical input interface of the first photoelectric conversion module 18, the control interface of all-two optical switches 16 is connected to the 1 monitoring interface of the third network management 19, the radio frequency output interface of the first photoelectric conversion module 18 is the output interface of the adjustment signal, the reporting control interface of all the two optical switches 16 is connected to one monitoring interface of the third network management 19, and some external network management interfaces of the third network management 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, where the monitoring tandem device 20 is connected to the first network manager 8, the second network manager 13 and the third network manager 19, and the computer 21 is connected to the monitoring tandem device 20;
the computer 21 is configured 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 configured to issue the first control instruction to the first network management system 8, issue the second control instruction to the third network management system 19, and issue the adjustment instruction and the third control instruction to the second network management system 13.
Specifically, the monitoring tandem device 20 has a plurality of +2 monitoring interfaces and interaction interfaces, which are respectively connected to the external network management interface of the third network management 19, the external network management interface of the first network management 8, and the external network management interface of the second network management 13 of the array element photoelectric unit 4, and the interaction interface of the monitoring tandem device 20 is connected to the computer 21.
When calibrating the time delay consistency, the monitoring tandem device 20 issues the first control instruction through the first network management 8, the two-switch one-radio frequency switch 5 powers on the time 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-switch one-radio frequency switch 5 connected with the input interface of the time frequency signal to be disconnected, the monitoring tandem device 20 issues the third control instruction through the second network management 13 to control the second optical amplifier 12 to be powered on, the time delay adjustment module 15 is in a time delay maintaining state, the three-switch two-optical switch 16 is controlled to be switched to the optical reflector 17 through the third network management 19, the time 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 optical signal, the first optical amplification signal converts the reference radio frequency optical signal into an electrical signal, and the electrical signal is output from the first optical port of the optical circulator 11 to the second optical port through the second optical portThe optical splitter 14 is transmitted to the optical reflector 17 through the delay adjustment module 15, the optical reflector 17 totally reflects the reference radio frequency optical signal as a reflection signal to the second optical port of the optical circulator 11 through the delay adjustment module 15 and the optical splitter 14, and transmits the reflection signal to the second optical amplifier 12 through the third optical port, the second optical amplifier 12 amplifies the reflection signal and transmits the amplified reflection signal to the second photoelectric conversion module 7 as a loop optical signal, the second photoelectric conversion module 7 converts the loop optical signal into a loop electrical signal, and the delay measurement module 9 measures a delay value T of the current channel based on the loop electrical signal1And reporting the delay value to the monitoring tandem device 20 of the operation and maintenance unit 3 through the first network manager 8, after receiving the data, the monitoring tandem device 20 issues the second adjustment instruction through the third network manager 19, the all-two optical switches 16 are switched to the first photoelectric conversion module 18 based on the second adjustment instruction until the delay measurement work of the current link is finished, and then the monitoring tandem device 20 automatically controls the output direction of the all-two optical switches 16 inside the array element photoelectric unit 4 in the selected channel, so as to measure the delay value T of each of the other channels in the calibration range2、T3...TNThe monitoring tandem device 20 of the operation and maintenance unit 3 selects a calibration reference channel, and records a time delay value of the calibration reference channel as T0Then calculating the experimental difference T of the time delay value of each channelΔ1、TΔ2、TΔ3...TΔN-1Finally, the monitoring tandem device 20 of the operation and maintenance unit 3 issues the adjustment instruction to the delay adjustment module 15 through the second network manager 13, and the delay adjustment module 15 performs T on each pass based on the adjustment instructionΔ1、TΔ2、TΔ 3...TΔN-1And (4) accurately adjusting the time delay difference.
When transmitting signals, the monitoring tandem device 20 issues the first control instruction through the first network management module 8, the two-switch 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 time delay measurement module 9 and the second photoelectric conversion module 7 to be powered off, the monitoring tandem device 20 issues a third control instruction to the second network management module 13, the second network management module 13 controls the second optical amplifier 12 to be powered off based on the third control instruction, the monitoring tandem device 20 issues the second control instruction through the third network management module 19, the all-two optical switches 16 are switched to the first photoelectric conversion module 18 based on the second control instruction, and the output time-frequency signal is converted into a second optical signal through the electro-optical conversion module 6, the first optical amplifier 10 amplifies the second optical signal, the amplified second amplified signal is output to the optical splitter 14 through the second optical port via the first optical port of the optical circulator 11, the optical splitter 14 equally divides the second amplified signal into a plurality of second branch signals and outputs the second branch signals to the delay adjusting module 15, the delay adjusting module 15 includes a plurality of channels of reconfigurable optical delay lines, the state of the delay adjusting module 15 in a delay holding state is maintained in a state after the last adjustment is completed, the plurality of second branch signals pass through the first photoelectric conversion modules 18 of the array element photoelectric units 4 respectively corresponding to a plurality of optical fiber output values, and the first photoelectric conversion modules 18 convert the corresponding second branch signals into electrical signals and output the electrical signals.
Although the preferred embodiment of the present invention has been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications and equivalent arrangements included within the scope of the invention.
Claims (5)
1. An automatic calibration system for phased array time-frequency synchronous distribution time delay consistency is characterized by comprising an electro-optical unit, an optical power division unit, an operation and maintenance unit and a plurality of array element photoelectric units;
the electro-optical unit is connected with the optical power division unit, the array element photoelectric units are respectively connected with the optical power division unit, and the operation and maintenance unit is connected with the electro-optical unit, the optical power division unit and the array element photoelectric units;
the operation and maintenance unit is used for issuing instructions to the electro-optical unit, the optical power division unit and the array element photoelectric units;
the electro-optical unit is configured to output a reference radio frequency signal, convert the reference radio frequency signal into a reference radio frequency optical signal, output the reference radio frequency optical signal, convert a loop optical signal output by the optical power division unit into a loop electrical signal, and measure a time delay difference between the reference radio frequency signal and the loop electrical signal;
the optical power division unit is configured to perform delay adjustment on the output reference radio frequency optical signal, transmit an adjusted adjustment signal to the array element photoelectric unit, and amplify a reflected optical signal of the array element photoelectric unit to transmit the amplified reflected optical signal to the electro-optical unit as the loop optical signal;
and the array element photoelectric unit is used for reflecting the adjusting signal as the reflection signal to the optical power division unit.
2. The phased array time-frequency synchronization distribution delay consistency automatic calibration system of claim 1,
the electro-optical unit comprises a two-to-one radio frequency switch, an electro-optical conversion module, a second photoelectric conversion module, a first network management and a time delay measurement module, the two-to-one radio frequency switch, the electro-optical conversion module, the first network management and the time delay measurement module are sequentially connected, the first network management is connected with the two-to-one radio frequency switch, and the second photoelectric conversion module is connected with the time delay measurement module and the first network management;
the first network manager is used for controlling the two-switch one-radio frequency switch according to a first control instruction issued by the operation and maintenance unit;
the second-switching-one radio frequency switch controls the second photoelectric conversion module and the time delay measurement module to be powered on and powered off based on the first control instruction;
the time delay measuring module is used for outputting a reference radio frequency signal and measuring the time delay difference between the reference radio frequency signal and the loop electric signal;
the electro-optical conversion module is used for converting the reference radio frequency signal into a reference radio frequency optical signal;
and the second photoelectric conversion module is used for converting the loop back optical signal into a loop back electrical signal.
3. The phased array time-frequency synchronization distribution delay consistency automatic calibration system of claim 2,
the optical power division unit comprises a first optical amplifier, an optical circulator, a second optical amplifier, a second network management, an optical splitter and a time delay adjusting module, wherein the first optical amplifier, the optical circulator, the second optical amplifier and the second network management are sequentially connected, the second optical amplifier is connected with the second photoelectric conversion module, the optical splitter is connected with the optical circulator, and the time delay adjusting module is connected with the optical splitter;
the second network manager is configured to receive an adjustment instruction and a third control instruction issued by the operation and maintenance unit, transmit the adjustment instruction to the delay adjustment module, and control power-on and power-off of the second optical amplifier based on the third control instruction;
the first optical amplifier is used for amplifying the power of the reference radio frequency optical signal to obtain an amplified signal;
the optical circulator is used for transmitting the amplified signal to the optical splitter and transmitting the reflected signal reflected by the array element photoelectric unit to the second optical amplifier;
the optical splitter is used for equally dividing the amplified signal into a plurality of split signals and transmitting the split signals to the time delay adjusting module;
the time delay adjusting module adjusts the time delay amount of the plurality of shunt signals based on the adjusting instruction to obtain a plurality of adjusting optical signals;
and the second optical amplifier is used for amplifying the reflected signal and then transmitting the amplified reflected signal as the loop optical signal to the second photoelectric conversion module.
4. The phased array time-frequency synchronization distribution delay consistency automatic calibration system of claim 3,
the array element photoelectric unit comprises all two optical switches, a light reflector, a first photoelectric conversion module and a third network management, wherein all the two optical switches, the first photoelectric conversion module and the third network management are sequentially connected, and the light reflector is connected with all the two optical switches;
the third network manager is used for controlling all the second optical switches according to a second control instruction issued by the operation and maintenance unit;
the all-two optical switch is used for controlling the power-on and power-off of the light reflector and the first photoelectric conversion module based on the second control instruction;
the first photoelectric conversion module is used for converting the corresponding adjusting optical signal into an adjusting electrical signal and outputting the adjusting electrical signal;
and the light reflector is used for totally reflecting the corresponding reflection signal of the adjusted optical signal to the optical circulator through the time delay adjusting module and the optical splitter.
5. The phased array time-frequency synchronization distribution delay consistency automatic calibration system of claim 4,
the operation and maintenance unit comprises monitoring tandem equipment and a computer, wherein the monitoring tandem equipment is connected with the first network manager, the second network manager and the third network manager, and the computer is connected with the monitoring tandem equipment;
the computer is used for inputting the first control instruction, the second control instruction and the adjusting instruction to the monitoring tandem equipment;
the monitoring tandem device is configured to issue the first control instruction to the first network manager, issue the second control instruction to a third network manager, and issue the adjustment instruction and the third control instruction to the second network manager.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111495402.XA CN114384478A (en) | 2021-12-09 | 2021-12-09 | Automatic calibration system for phased array time frequency synchronous distribution time delay consistency |
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| CN202111495402.XA CN114384478A (en) | 2021-12-09 | 2021-12-09 | Automatic calibration system for phased array time frequency synchronous distribution time delay consistency |
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