CN106850037A - A kind of multichannel transmitting-receiving time delay real-time monitoring system and method with calibration transceiver channel - Google Patents

A kind of multichannel transmitting-receiving time delay real-time monitoring system and method with calibration transceiver channel Download PDF

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Publication number
CN106850037A
CN106850037A CN201611193063.9A CN201611193063A CN106850037A CN 106850037 A CN106850037 A CN 106850037A CN 201611193063 A CN201611193063 A CN 201611193063A CN 106850037 A CN106850037 A CN 106850037A
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China
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calibration
satellite link
attenuator
transmitting
inter
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CN106850037B (en
Inventor
蒙艳松
赵雯雯
邢炜
朱向鹏
刘涛
徐连军
韩星远
郁彦利
胡涛
郝博
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Xian Institute of Space Radio Technology
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Xian Institute of Space Radio Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters

Abstract

A kind of multichannel transmitting-receiving time delay real-time monitoring system and method with calibration transceiver channel are as follows：Measurement calibration transmission channel and calibration receiving channel closed loop time delay and, the closed loop time delay and subtract calibration the absolute time delay of transmission channel, obtain calibrate the absolute time delay of receiving channel；Measurement reflecting surface inter-satellite link transmission channel and phased array inter-satellite link transmission channel with calibration receiving channel closed loop time delay and, these closed loop time delays and subtract calibration the absolute time delay of receiving channel, obtain reflecting surface inter-satellite link transmission channel and the absolute time delay of phased array inter-satellite link transmission channel；The closed loop time delay of measurement calibration transmission channel and reflecting surface inter-satellite link receiving channel and phased array inter-satellite link receiving channel and, the calibration absolute time delay of transmission channel is subtracted, reflecting surface inter-satellite link receiving channel and the absolute time delay of phased array inter-satellite link receiving channel is obtained.The present invention realizes multichannel transmitting-receiving time delay real-time monitoring, and with the transceiver channel accurate feature of absolute time delay of measurement.

Description

It is a kind of with calibration transceiver channel multichannel transmitting-receiving time delay real-time monitoring system and Method
Technical field
The present invention a kind of multichannel transmitting-receiving time delay real-time monitoring system and method with calibration transceiver channel are that is, a kind of more Passage receives and dispatches time delay real-time monitoring system and method, the technical field for being related to spread spectrum to measure, and is related specifically to a kind of for spreading The multichannel transmitting-receiving time delay real-time monitoring system and monitoring method of Instrumentation system.
Background technology
China's Beidou II satellite navigation system the second stage of the project will be extended for covering the whole world on the basis of first stage of the project Satellite navigation system.It is to improve global system operation control ability, improve space-time datum precision and improve star to set up inter-satellite link The effective means of seat autonomous operation ability.Inter-satellite link provides the wireless transfer channel between satellite and satellite, using double between star To measurement and data exchange, enter planetary autonomous orbit determination and time synchronized, Autonomous maintenance constellation and time reference, meet special Different period navigation constellation independent navigation and the usually demand of raising navigation and positioning accuracy, and in the case of can solving domestic cloth station Global system transports control problem.
There is a plurality of inter-satellite link in Beidou II second phase Navigation Satellite single satellite, including 3 transmitting-receiving alien frequencies are entirely double Work reflecting surface inter-satellite link and 1 transmit-receive cofrequency time-division half-duplex phased array inter-satellite link are, it is necessary to this 4 inter-satellite link transmitting-receivings Time delay carries out real-time monitoring.Traditional channel time delay monitoring method generally directed to be single transceiver channel, devise one and recognize It is the constant transmission channel of time delay or receiving channel, by switching microwave switch and normal transmission passage or normally receiving passage structure Into closed loop, measure the time delay of closed loop and the absolute time delay of receiving channel is extended to so as to obtain transmission channel absolute time, because microwave is opened There is multipath signal leakage in pass, make the absolute time delay of transceiver channel of measurement inaccurate.And defended in Beidou II second phase navigation experiment There are 4 inter-satellite links in star single satellite, if needing 4 sets from closed loop passage using conventional method, equipment is complicated, while monitoring The absolute time delay of multiple transceiver channels it is all inaccurate.
The content of the invention
Present invention solves the technical problem that being：Overcome prior art not enough, there is provided a kind of with many of calibration transceiver channel Passage receives and dispatches time delay method of real-time, and compensate for existing method can not carry out multichannel transmitting-receiving time delay real-time monitoring and measurement The inaccurate shortcoming of the absolute time delay of transceiver channel.
Technical solution of the invention is：A kind of multichannel transmitting-receiving time delay real-time monitoring system with calibration transceiver channel System, including：Reflecting surface inter-satellite link equipment, phased array inter-satellite link equipment, calibration transceiver channel, attenuator group, radio-frequency cable；
Attenuator group includes：Attenuator 1, attenuator 2, attenuator 3, attenuator 4, attenuator 5, attenuator 6, attenuator 7, Attenuator 8；
Reflecting surface inter-satellite link equipment, including：The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2, reflection The equipment of face inter-satellite link 3；The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2 and the equipment of reflecting surface inter-satellite link 3 Composition and function are all identical；
The equipment of reflecting surface inter-satellite link 1, including：Transmitting baseband 1, reception base band 1, transmission channel 1, receiving channel 1, duplex Component 1, coupler 1, reflector antenna 1；
Transmitting baseband 1 produces Cross-Link measurement to give hair with the baseband signal of communication according to radio frequency signal communication agreement between star Penetrate passage 1；Transmission channel 1 receives baseband signal from transmitting baseband 1, is obtained after radio-frequency modulations, power amplification are carried out to baseband signal Duplexing component 1 is sent to transmitting radiofrequency signal；Duplexing component 1 receives transmitting radiofrequency signal from transmission channel 1, to the transmitting radio frequency Signal obtains filtered transmitting radiofrequency signal after being filtered, be sent to coupler 1；Coupler 1 accepts filter from duplexing component 1 Transmitting radiofrequency signal afterwards, is directly sent to reflector antenna 1 all the way, another road as the equipment of reflecting surface inter-satellite link 1 transmitting Radiofrequency signal, and according to coupling ratio coupling output to attenuator 1, attenuator 5 is delivered to after decaying through attenuator 1, coupler 1 is simultaneously The reception radiofrequency signal that reception is received from reflector antenna 1, while receiving the calibration sent from attenuator 1 also according to coupling ratio Transmission signal, the reception radiofrequency signal that will be received and calibration transmission signal are sent to duplexing component 1；Duplexing component 1 is from coupler 1 Reception radiofrequency signal and calibration transmission signal are received, filtered reception radiofrequency signal and school are obtained after being filtered to them Quasi- transmission signal, is sent to receiving channel 1；Receiving channel 1 from duplexing component 1 accept filter after reception radiofrequency signal and calibration send out Signal is penetrated, they is amplified, is filtered, obtaining intermediate-freuqncy signal after down coversion, be sent to reception base band 1；Receive base band 1 from reception The receiving intermediate frequency signal of passage 1, AD samplings, despread-and-demodulation, pseudo range measurement is carried out to the intermediate-freuqncy signal and is obtained between interstellar distance and star Communication data, while also obtaining calibrating receiving channel closed loop time delay and measurement of the transmission channel to the equipment of reflecting surface inter-satellite link 1 Data；Reflector antenna 1 receives the transmitting radiofrequency signal that coupler 1 is sent, and transmitting radiofrequency signal is converted into electromagnetic radiation To in space, while the electromagnetic wave in reception space, converts electromagnetic waves into reception radiofrequency signal and is sent to coupler 1.
The transmitting radiofrequency signal output of the equipment of reflecting surface inter-satellite link 2 is delivered to after decaying through attenuator 2 and declined to attenuator 2 Subtract device 6；
The transmitting radiofrequency signal output of the equipment of reflecting surface inter-satellite link 3 is delivered to after decaying through attenuator 3 and declined to attenuator 3 Subtract device 7；
Phased array inter-satellite link equipment, including：Transmitting baseband 4, reception base band 4, transmission channel 4, receiving channel 4, work(point Device, coupler 4, circulator, phased array antenna；
Transmitting baseband 4 produces Cross-Link measurement to give hair with the baseband signal of communication according to radio frequency signal communication agreement between star Penetrate passage 4；Transmission channel 4 receives baseband signal from transmitting baseband 4, is obtained after radio-frequency modulations, power amplification are carried out to baseband signal Power splitter is sent to transmitting radiofrequency signal；Power splitter receives transmitting radiofrequency signal from transmission channel 4, and transmitting radiofrequency signal is carried out Two-way transmitting radiofrequency signal is obtained after branch, wherein being sent to circulator all the way, another road is sent to phased array antenna；Circulator is from work( Point device receives the transmitting radiofrequency signal after branch, using the transmitting radiofrequency signal as phased array inter-satellite link equipment transmitting radio frequency To attenuator 4, by the decay of attenuator 4 output to attenuator 8, circulator receives what is sent from attenuator 4 to signal output simultaneously Calibration transmitting radiofrequency signal, coupler 4 is sent to by calibration transmitting radiofrequency signal；Coupler 4 is received and received from phased array antenna The reception radiofrequency signal for arriving, while the calibration transmission signal sent from circulator is received also according to coupling ratio, by connecing for receiving Receive radiofrequency signal and calibration transmission signal is sent to receiving channel 4；Receiving channel 4 from coupler 4 receive reception radiofrequency signal and They are amplified, filtered, obtaining intermediate-freuqncy signal after down coversion by calibration transmission signal, are sent to reception base band 4；Receive base band 4 From the receiving intermediate frequency signal of receiving channel 4, AD samplings, despread-and-demodulation, pseudo range measurement are carried out to the intermediate-freuqncy signal and obtains interstellar distance The communication data and between star, while also obtaining calibrating closed-loop measuring data；Phased array antenna receives the transmitting radio frequency that power splitter is sent Signal, will transmitting radiofrequency signal amplify after be converted to electromagnetic radiation in space, while the electromagnetic wave in reception space, by electricity Magnetic wave is converted to after reception radiofrequency signal is amplified and is sent to coupler 4.
Calibration transceiver channel, including：Calibration transmission channel, calibration receiving channel, three-way device, branch combiner；Its lieutenant colonel Quasi- transmission channel includes：Calibration transmitting baseband, transmitting local oscillator, variable attenuator, BPSK modulators, calibration receiving channel include： Calibration receives base band, receives local oscillator, frequency mixer, wave filter, amplifier；
Calibration transmitting baseband produces calibration baseband signal to give BPSK modulators；Transmitting local oscillator is according to calibration tranmitting frequency control Signal processed produces the transmitting local oscillation signal of corresponding frequencies, is sent to variable attenuator；Variable attenuator receives what transmitting local oscillator was sent Transmitting local oscillation signal, the pad value of variable attenuator is adjusted according to outside attenuation control signal, after obtaining power adjustment Transmitting local oscillation signal, and the transmitting local oscillation signal is sent to BPSK modulators；BPSK modulators receive school from calibration transmitting baseband Quasi- baseband signal, transmitting local oscillation signal is received from variable attenuator, carry out BPSK modulation, produce calibration transmitting radiofrequency signal, will Calibration transmitting radiofrequency signal is sent to three-way device；Three-way device receives calibration transmitting radiofrequency signal from BPSK modulators, and calibration is launched Radiofrequency signal is sent to frequency mixer and branch combiner respectively, while also receiving inter-satellite link transmitting radio frequency letter from branch combiner Number, and inter-satellite link transmitting radiofrequency signal is sent to frequency mixer；Branch combiner receives calibration transmitting radiofrequency signal from three-way device, Attenuator 5, attenuator 6, attenuator 7, attenuator 8 are sent to after carrying out branch to calibration transmitting radiofrequency signal, while attenuator 5 connects Receive and deliver to branch combining after the transmitting radiofrequency signal of the reflecting surface inter-satellite link 1 of the decay of attenuator 1 decays through attenuator 5 Device, the transmitting radiofrequency signal from the equipment of the reception reflecting surface of attenuator 6 inter-satellite link 2 deliver to branch combining after decaying through attenuator 6 Device, the transmitting radiofrequency signal for receiving the equipment of reflecting surface inter-satellite link 3 decayed by attenuator 4 from attenuator 7 decline through attenuator 7 The transmitting radiofrequency signal for branch combiner is delivered to after subtracting, receiving phased array inter-satellite link equipment from attenuator 8 decays through attenuator 8 After deliver to branch combiner, the 4 inter-satellite links transmitting radiofrequency signal after branch combiner attenuator 5 to attenuator 8 is decayed is closed Three-way device is sent to behind road；
The reception local oscillation signal that local oscillator produces corresponding frequencies according to outside calibration receives frequency control signal is received, is sent to Frequency mixer；Frequency mixer receives calibration transmitting radiofrequency signal and inter-satellite link transmitting radiofrequency signal, is connect from reception local oscillator from three-way device Receive and receive local oscillation signal, local oscillation signal launches calibration radiofrequency signal and inter-satellite link is launched radiofrequency signal and mixed with receiving Frequently, obtain with frequency signal and difference frequency signal, wave filter will be sent to frequency signal and difference frequency signal；Wave filter from frequency mixer receive and Frequency signal and difference frequency signal, carry out LPF, retain difference frequency signal, and the difference frequency signal is exactly intermediate-freuqncy signal, by intermediate frequency letter Number it is sent to amplifier；Amplifier will amplify from wave filter receiving intermediate frequency signal, the intermediate-freuqncy signal after being amplified after being amplified Intermediate-freuqncy signal afterwards is sent to calibration and receives base band；Calibration receives base band and receives the intermediate-freuqncy signal after amplifying from amplifier, in this Frequency signal carries out AD samplings, despread-and-demodulation, pseudo range measurement and obtains calibrating closed-loop measuring data.
Attenuator 1, attenuator 2, attenuator 3, attenuator 4, attenuator 5, attenuator 6, attenuator 7, attenuator 8, radio frequency Cable 1, radio-frequency cable 2, radio-frequency cable 3, radio-frequency cable 4 are used to realize reflecting surface inter-satellite link equipment, phased array inter-satellite link Equipment and the two-way radio-frequency signal transmission of calibration transceiver channel, according to cable attenuation amount, the attenuator different by configuring pad value The radio-frequency power of each link entrance is can configure, calibration is launched radiofrequency signal does not influence between reflecting surface inter-satellite link and phased array star Link is normally received, and to calibrate receiving channel can also normally receive the hair of reflecting surface inter-satellite link and phased array inter-satellite link Radiofrequency signal is penetrated, while prevention at radio-frequency port standing-wave ratio is tried one's best improved, so as to reduce the generation of multipath signal.
Reflecting surface inter-satellite link equipment includes：The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2, reflecting surface The equipment of inter-satellite link 3；The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2 and the equipment group of reflecting surface inter-satellite link 3 Into and function it is all identical, they with calibration transceiver channel connected mode it is also identical, and they passage transmitting-receiving time delay supervise in real time Survey method is also identical.
Radio-frequency cable includes：Radio-frequency cable 1, radio-frequency cable 2, radio-frequency cable 3 and radio-frequency cable 4；Wherein attenuator 1, penetrate Frequency cable 1, attenuator 5 are provided commonly for the equipment of connection reflecting surface inter-satellite link 1 to calibrating transceiver channel；Attenuator 2, radio-frequency cable 2nd, attenuator 6 is used to connect the equipment of reflecting surface inter-satellite link 2 to calibrating transceiver channel；Attenuator 3, radio-frequency cable 3, attenuator 6 For connecting the equipment of reflecting surface inter-satellite link 3 to calibrating transceiver channel；Attenuator 4, radio-frequency cable 4, attenuator 8 are used to connect phase Control battle array inter-satellite link equipment is to calibrating transceiver channel.
Circulator is a three port passive devices, including port 1, port 2 and port 3, from the signal of the input of port 1 from Port 2 exports, and is exported from port 3 from the signal of the input of port 2, for the Path selection of radiofrequency signal, is input to inserting for output It is 2dB to damage.
The maximum attenuation amount of variable attenuator is 62dB, decay stepping 1dB.
Transmitting local oscillator can produce any one in three frequencies RF1, RF2, RF3, by the calibration tranmitting frequency of 2bit Control signal is selected, and receives local oscillator three frequency RF1 can be produced to subtract intermediate frequency, RF2 and subtract intermediate frequency, RF3 and subtract intermediate frequency In any one, selected by the calibration receives frequency control signal of 2bit.
A kind of multichannel transmitting-receiving time delay method of real-time with calibration transceiver channel, including calibration transceiver channel is certainly School, the calibration of standard emission passage, the calibration of standard receiving channel, these three stage etch are as follows：
1) transceiver channel self-correcting is calibrated, calibration receiving channel is obtained in reflecting surface inter-satellite link launching frequency and phased array star Between link RF frequency the absolute time delay of calibration receiving channel, step is as follows：
1.1) transmitting local frequency is set to reflecting surface inter-satellite link equipment tranmitting frequency；
1.2) local frequency will be received to be set to reflecting surface inter-satellite link equipment tranmitting frequency and subtract IF-FRE；
1.3) adjustment variable attenuator enables calibration receiving channel intermediate frequency to be output as the electricity that calibration receives base band ADC samplings It is flat；
1.4) after calibration transmitting baseband transmitting pseudo-code being set into calibration private code with calibration reception Baseband Receiver pseudo-code, survey Go out to calibrate transceiver channel closed loop time delay and；Described calibration private code is the binary system that yard cycle is generated for 1s by m-sequence requirement Pseudo noise code；
1.5) calibration transceiver channel closed loop time delay is launched into absolute time delay with calibration is subtracted, is obtained in reflecting surface inter-satellite link The absolute time delay of calibration receiving channel in launching frequency；The described calibration absolute time delay of transmitting is by calibration transceiver channel By being obtained after software processing (because three-way device and branch are closed after delivery outlet high sampling rate oscillograph samples storage Road Qi Shi broadbands (5GHz) passive device, their time delay and be ps magnitudes can be ignored)；
1.6) transmitting local frequency is set to phased array inter-satellite link rf frequency, reception local frequency is set to phased Battle array inter-satellite link rf frequency subtracts IF-FRE, repeats 1.1) to 1.5), you can obtain in phased array inter-satellite link radio frequency frequently The absolute time delay of calibration receiving channel on point.
2) standard emission passage calibration, the transmission channel for obtaining three reflecting surface inter-satellite links and phased array inter-satellite link is exhausted To time delay, step is as follows：
2.1) transmitting local frequency is set to reflecting surface inter-satellite link tranmitting frequency, variable attenuator is arranged on 62dB and declines Downshift, makes BPSK modulators output level minimum, so that the signal of calibration transmission channel output does not influence to calibrate receiving channel Receive；
2.2) calibration reception local frequency is set to reflecting surface inter-satellite link tranmitting frequency and subtracts IF-FRE；
2.3) calibration is received into Baseband Receiver pseudo-code and is set to reflecting surface inter-satellite link emission measurement code；Chain between reflecting surface star Road emission measurement code is the inherent characteristic of reflecting surface inter-satellite link equipment；The equipment of reflecting surface inter-satellite link 1, reflecting surface inter-satellite link 2 equipment, the equipment of reflecting surface inter-satellite link 3 emission measurement code generating mode it is identical, they emission measurement code code phase when Between on have the relative time error of several chips respectively；
2.4) now, calibration receiving channel in frequency and pseudo-code from 3 different transmission channels of reflecting surface inter-satellite link Pair relationhip is all constituted, according to 3 emission measurement code code phases of the different transmission channels of reflecting surface inter-satellite link in the time The upper relative time error for having several chips respectively, measures 3 reflecting surface inter-satellite link transmission channels to calibrating receiving channel successively Closed loop time delay and；
2.5) by step 2.4) 3 closed loop time delays obtaining and subtract the calibration in reflecting surface inter-satellite link launching frequency The absolute time delay of receiving channel, obtains 3 reflecting surface absolute time delays of inter-satellite link transmission channel；
2.6) local frequency will be received to be set to phased array inter-satellite link rf frequency and subtract IF-FRE；
2.7) calibration is received into Baseband Receiver pseudo-code and is set to phased array inter-satellite link emission measurement code；Chain between phased array star Road emission measurement code is the inherent characteristic of phased array inter-satellite link equipment；
2.8) now, calibration receiving channel in frequency and pseudo-code with transmission channel all structures of phased array inter-satellite link equipment Into pair relationhip, measure phased array inter-satellite link transmission channel to the closed loop time delay for calibrating receiving channel and；
2.9) by step 2.8) the closed loop time delay that obtains and the calibration that subtracts on phased array inter-satellite link RF spot connect The absolute time delay of passage is received, the phased array absolute time delay of inter-satellite link transmission channel is obtained.
3) standard receiving channel calibration：The receiving channel for obtaining three reflecting surface inter-satellite links and phased array inter-satellite link is exhausted To time delay, step is as follows：
3.1) set variable attenuator attenuation make branch combiner export calibration transmitting RF signal power for- 62dBm；
3.2) calibration transmitting baseband transmitting pseudo-code is set to calibrate private code；
3.3) transmitting local frequency is set to reflecting surface inter-satellite link receiving channel receives frequency；
3.4) now, receiving channel of the calibration transmission channel with 3 reflecting surface inter-satellite link equipment in frequency is all constituted Pair relationhip, receives base band 1 to receiving base band 3 and measure calibration transmission channel to 3 reflecting surface inter-satellite links successively and receives logical The closed loop time delay in road and；
3.5) by step 3.4) 3 closed loop time delays obtaining and the calibration absolute time delay of transmission channel is subtracted, obtain 3 reflections The face absolute time delay of inter-satellite link receiving channel；
3.6) calibration transmitting local frequency is set to phased array link RF frequency；
3.7) now, receiving channel of the calibration transmission channel with phased array inter-satellite link equipment in frequency constitutes pairing Relation, receive base band 4 measure calibration transmission channel to phased array inter-satellite link receiving channel closed loop time delay and；
3.8) by step 3.7) the closed loop time delay that obtains and the calibration absolute time delay of transmission channel is subtracted, between obtaining phased array star The absolute time delay of link receiving channel.
Present invention advantage compared with prior art is：
(1) present invention includes 1 set of calibration transceiver channel, because device is all broadband passive device on calibration transmission channel, Self time-delay very little (ps grades), in a certain temperature spot, it is believed that its time delay is with the aging in range measurement tracking accuracy model of device Within enclosing；The change of environment temperature can cause the change of calibration transmission channel time delay, can measure its time delay-temperature by experiment Change curve, realizes amendment in real time；Thus, it is believed that the calibration absolute time delay of transmission channel is given value and constant；
(2) present invention can instruct the frequency for setting transmitting local oscillator and receiving local oscillator by external remote control, a) realize calibration hair Penetrate passage and calibrate the closed loop of receiving channel, closed loop time delay and the closed loop of measurement calibration transmission channel and calibration receiving channel Time delay and subtract calibration the absolute time delay of transmission channel, obtain calibrate the absolute time delay of receiving channel；B) reflecting surface inter-satellite link is realized Transmission channel and phased array inter-satellite link transmission channel and the closed loop of calibration receiving channel, measure the transmitting of reflecting surface inter-satellite link logical The closed loop time delay of road and phased array inter-satellite link transmission channel and calibration receiving channel and, these closed loop time delays with subtract calibration and connect The absolute time delay of passage is received, reflecting surface inter-satellite link transmission channel and the absolute time delay of phased array inter-satellite link transmission channel is obtained；c) Calibration transmission channel and reflecting surface inter-satellite link receiving channel and the closed loop of phased array inter-satellite link receiving channel are realized, school is measured The closed loop time delay of quasi- transmission channel and reflecting surface inter-satellite link receiving channel and phased array inter-satellite link receiving channel and, these are closed Ring time delay and subtract calibration the absolute time delay of transmission channel, obtain reflecting surface inter-satellite link receiving channel and phased array inter-satellite link connect Receive the absolute time delay of passage；It is achieved thereby that the real-time prison of the absolute time delay of inter-satellite link transmission channel and the absolute time delay of receiving channel Survey；
(3) present invention instructs the attenuation for setting variable attenuator by external remote control, thus it is possible to vary calibration transmission channel Power output, without change calibration the absolute time delay of transmission channel, so as to ensure that the absolute time delay of inter-satellite link transmission channel With the accuracy of the absolute time delay real-time monitoring of receiving channel；
(4) present invention realizes the closed loop between multiple equipment by three-way device and branch combiner, reduces using micro- Ripple switch switching mode realizes the multipath signal produced during closed loop, so as to ensure that the absolute time delay of inter-satellite link transmission channel and connect Receive the accuracy of the absolute time delay real-time monitoring of passage；
(5) present invention is according to radio-frequency cable attenuation, and can configure each link by configuring the different attenuator of pad value enters The radio-frequency power of mouth, calibration is launched radiofrequency signal does not influence reflecting surface inter-satellite link and the normal of phased array inter-satellite link to connect Receive, and calibrating receiving channel can also normally receive the transmitting radiofrequency signal of reflecting surface inter-satellite link and phased array inter-satellite link.
(6) present invention makes 3 emission measurement code code phases of the different transmission channels of reflecting surface inter-satellite link in time There is the relative time error of several chips respectively；Calibration receiving channel measures 3 reflections successively according to the relative time error of these chips Face inter-satellite link transmission channel to the closed loop time delay for calibrating receiving channel and.
Brief description of the drawings
Fig. 1 is a kind of original of multichannel transmitting-receiving time delay real-time monitoring system with calibration transceiver channel disclosed by the invention Reason block diagram.
Specific embodiment
Basic ideas of the invention are：It is a kind of with calibration transceiver channel multichannel transmitting-receiving time delay real-time monitoring system and Method is as follows：(1) system includes：Reflecting surface inter-satellite link equipment, phased array inter-satellite link equipment, calibration transceiver channel, decline Subtract device group, radio-frequency cable；(2) broadband passive device is used on calibration transmission channel, has made the absolute time delay of calibration transmission channel Know；(3) the closed loop time delay of measurement calibration transmission channel and calibration receiving channel and, the closed loop time delay and subtract calibration transmission channel Absolute time delay, obtains calibrating the absolute time delay of receiving channel；(4) chain between measurement reflecting surface inter-satellite link transmission channel and phased array star Road transmission channel with calibration receiving channel closed loop time delay and, these closed loop time delays and subtract calibrate the absolute time delay of receiving channel, Obtain reflecting surface inter-satellite link transmission channel and the absolute time delay of phased array inter-satellite link transmission channel；(5) measurement calibration transmitting is logical The closed loop time delay of road and reflecting surface inter-satellite link receiving channel and phased array inter-satellite link receiving channel and, subtract calibration transmitting and lead to The absolute time delay in road, obtains reflecting surface inter-satellite link receiving channel and the absolute time delay of phased array inter-satellite link receiving channel.The present invention Multichannel transmitting-receiving time delay real-time monitoring is realized, and with the transceiver channel accurate feature of absolute time delay of measurement.
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Selection to above-mentioned attenuator pad value below (is reflected with attenuator 1+ radio-frequency cable 1+ attenuators 5 for connecting The equipment of face inter-satellite link 1 is to calibrating transceiver channel) it is illustrated：Assuming that a width of 20MHz of inter-satellite link radio frequency signal bands, connects It is 4dB to receive passage LNA entrance equivalent noise figure, then LNA ingress noise power is -97dBm (- 174+4+10log10 (20MHz)=- 97)；By selecting the pad value of attenuator, make LNA entrance calibration launch RF signal power for- 110dBm, is 0.2dB to raising for receiving channel low noise, and the influence received to inter-satellite link signal is negligible, does not influence Reflecting surface inter-satellite link 1 is normally received；Because the degree of coupling of coupler 1 is 30dB, then in the entrance of coupler 1 calibration transmitting radio frequency Signal power is -80dBm, and the attenuation for passing through to set calibration transceiver channel variable attenuator makes branch combiner export calibration Transmitting RF signal power is -62dBm, then the overall attenuation of attenuator 1+ radio-frequency cables 1+ attenuators 5 is 18dB, if radio frequency Cable 1 decays to 12dB, then the attenuation of attenuator 1 is chosen as 3dB, and the attenuation of attenuator 5 is chosen as 3dB.
The amplified power of transmitting radiofrequency signal of reflecting surface inter-satellite link 1 is 45dBm, by the 30dB couplings of coupler 1 Close and the 18dB of attenuator 1+ radio-frequency cable 1+ attenuators 5 decays, be during the branch combiner entrance for reaching calibration transceiver channel- 3dBm, calibration receiving channel can normally receive the radiofrequency signal.
Similarly, the overall attenuation of attenuator 2+ radio-frequency cables 2+ attenuators 6 is 18dB, attenuator 3+ radio-frequency cables 3+ decay The overall attenuation of device 7 is also 18dB, and the radio-frequency cable 2 and the pad value of radio-frequency cable 3 that can be obtained according to measurement select decay The pad value of device 2, attenuator 6, attenuator 3 and attenuator 7.
There is the Insertion Loss of 2dB due to circulator, so the overall attenuation of attenuator 4+ radio-frequency cable 4+ attenuators 8 is 16dB, The pad value selection attenuator 4 of the radio-frequency cable 4 that can be obtained according to measurement, the pad value of attenuator 8.
As shown in figure 1, the embodiment of the present invention is received by reflecting surface inter-satellite link equipment, phased array inter-satellite link equipment, calibration Hair passage, attenuator group, radio-frequency cable composition.
Reflecting surface inter-satellite link equipment, including：The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2, reflection The equipment of face inter-satellite link 3；The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2 and the equipment of reflecting surface inter-satellite link 3 Composition and function are all identical；They are also identical with the connected mode of calibration transceiver channel, and their passage transmitting-receiving time delay is real-time Monitoring method is also identical.
The embodiment of the present invention 3 sets of reflecting surface inter-satellite link equipment radio frequency frequency point settings be RF1, RF2, can be according to outside Telecommand make they be operated in launching frequency for RF1 receive frequency be RF2, launching frequency be RF2 receive frequency be RF1 this two The one kind in option is planted, and their launching frequency is all, receives frequency also all, is transmitting-receiving isofrequency full-duplex Working mould Formula.
Attenuator group includes：Attenuator 1, attenuator 2, attenuator 3, attenuator 4, attenuator 5, attenuator 6, attenuator 7, Attenuator 8；Radio-frequency cable includes：Radio-frequency cable 1, radio-frequency cable 2, radio-frequency cable 3 and radio-frequency cable 4.Wherein attenuator 1, penetrate Frequency cable 1, attenuator 5 are provided commonly for the equipment of connection reflecting surface inter-satellite link 1 to calibrating transceiver channel；Attenuator 2, radio-frequency cable 2nd, attenuator 6 is used to connect the equipment of reflecting surface inter-satellite link 2 to calibrating transceiver channel；Attenuator 3, radio-frequency cable 3, attenuator 6 For connecting the equipment of reflecting surface inter-satellite link 3 to calibrating transceiver channel；Attenuator 4, radio-frequency cable 4, attenuator 8 are used to connect phase Control battle array inter-satellite link equipment is to calibrating transceiver channel.
The equipment of reflecting surface inter-satellite link 1, including：Transmitting baseband 1, reception base band 1, transmission channel 1, receiving channel 1, duplex Component 1, coupler 1, reflector antenna 1.
The equipment of reflecting surface inter-satellite link 2, including：Transmitting baseband 2, reception base band 2, transmission channel 2, receiving channel 2, duplex Component 2, coupler 2, reflector antenna 2.
The equipment of reflecting surface inter-satellite link 3, including：Transmitting baseband 3, reception base band 3, transmission channel 3, receiving channel 3, duplex Component 3, coupler 3, reflector antenna 3.
Phased array inter-satellite link equipment, including：Transmitting baseband 4, reception base band 4, transmission channel 4, receiving channel 4, work(point Device, coupler 4, circulator, phased array antenna.
Phased array inter-satellite link equipment radio frequency frequency point setting is RF3 by the embodiment of the present invention, is the transmit-receive cofrequency time-division half pair Work mode of operation.
Calibration transceiver channel, including：Calibration transmission channel, calibration receiving channel, three-way device, branch combiner；Its lieutenant colonel Quasi- transmission channel includes：Calibration transmitting baseband, transmitting local oscillator, variable attenuator, BPSK modulators, calibration receiving channel include： Calibration receives base band, receives local oscillator, frequency mixer, wave filter, amplifier.
Embodiment of the present invention transmitting local oscillator can produce any one in three frequencies RF1, RF2, RF3, by 2bit's Calibration tranmitting frequency control signal selected, receive local oscillator can produce three frequency RF1 subtract intermediate frequency, RF2 subtract intermediate frequency, RF3 subtracts any one in intermediate frequency, is selected by the calibration receives frequency control signal of 2bit.
Device is all broadband passive device on embodiment of the present invention calibration transmission channel, self time-delay very little (ps grades), A certain temperature spot, it is believed that its time delay is with the aging within the scope of range measurement tracking accuracy of device；The change of environment temperature The change of calibration transmission channel time delay can be caused, its time delay-temperature variation curve can be measured by experiment, realize amendment in real time； Thus, it is believed that the calibration absolute time delay of transmission channel is given value and constant.
The maximum attenuation amount of embodiment of the present invention variable attenuator is 62dB, and decay stepping 1dB, is instructed by external remote control The attenuation of variable attenuator is set, thus it is possible to vary the power output of calibration transmission channel, and because variable attenuator is not being produced On the signal path of raw time delay, thus the absolute time delay of calibration transmission channel (the group delay variable quantity of differential declines shelves will not be changed About 57s, the present invention can be by the influence of 57 seconds time delays removal), so as to ensure that the absolute time delay of inter-satellite link transmission channel and The accuracy of the absolute time delay real-time monitoring of receiving channel.
The embodiment of the present invention realizes the closed loop between multiple equipment, so as to ensure by three-way device and branch combiner The accuracy of the absolute time delay of inter-satellite link transmission channel and the absolute time delay real-time monitoring of receiving channel；If using microwave switch RF signal path selection is carried out instead of three-way device and branch combiner, because the standing-wave ratio of Ka frequency range microwave switches is typically larger than 1.2, then the multipath signal of generation is reflected than main signal most size 20.8dB, compare main signal much smaller than multipath signal in measuring system The requirement of small 40dB.
The embodiment of the present invention according to signal power matching require the coupler 1, coupler 2 coupled for radiofrequency signal, Coupler 3, the coupling ratio of coupler 4 are all preferably designed for 30dB.
The embodiment of the present invention is entered according to radio-frequency cable attenuation by configuring pad value each link of different attenuator configurations The radio-frequency power of mouth, calibration is launched radiofrequency signal does not influence reflecting surface inter-satellite link and the normal of phased array inter-satellite link to connect Receive, and calibrating receiving channel can also normally receive the transmitting radiofrequency signal of reflecting surface inter-satellite link and phased array inter-satellite link, Prevention at radio-frequency port standing-wave ratio is tried one's best simultaneously is improved, so as to reduce the generation of multipath signal.
Selection to above-mentioned attenuator pad value below (is reflected with attenuator 1+ radio-frequency cable 1+ attenuators 5 for connecting The equipment of face inter-satellite link 1 is to calibrating transceiver channel) it is illustrated：Assuming that a width of 20MHz of inter-satellite link radio frequency signal bands, connects It is 4dB to receive passage LNA entrance equivalent noise figure, then LNA ingress noise power is -97dBm (- 174+4+10log10 (20MHz)=- 97)；By selecting the pad value of attenuator, make LNA entrance calibration launch RF signal power for- 110dBm, is 0.2dB to raising for receiving channel low noise, and the influence received to inter-satellite link signal is negligible, does not influence Reflecting surface inter-satellite link 1 is normally received；Because the degree of coupling of coupler 1 is 30dB, then in the entrance of coupler 1 calibration transmitting radio frequency Signal power is -80dBm, and the attenuation for passing through to set calibration transceiver channel variable attenuator makes branch combiner export calibration Transmitting RF signal power is -62dBm, then the overall attenuation of attenuator 1+ radio-frequency cables 1+ attenuators 5 is 18dB；And reflecting surface The amplified power of transmitting radiofrequency signal of inter-satellite link 1 is 45dBm, is penetrated by the 30dB couplings of coupler 1 and attenuator 1+ The 18dB decay of frequency cable 1+ attenuators 5, is -3dBm during the branch combiner entrance for reaching calibration transceiver channel, and calibration is received Passage can normally receive the radiofrequency signal.Now need the attenuation and coupler 1 and branch combiner of measurement radio-frequency cable 1 The standing-wave ratio of that port being connected with attenuator 5, it is assumed that radio-frequency cable 1 decays to 6dB, then attenuator 1+ attenuators 5 is total Attenuation is 12dB, now to carry out attenuator choosing according to the two port standing-wave ratios and the attenuator situation of getting the raw materials ready of storehouse surveyed Select, preferably, then the attenuation of attenuator 1 can be big by one with smaller, attenuator 5 attenuation for the port standing wave of usual coupler A bit, such as attenuator 1 is 2dB, then attenuator 5 is 10dB, and prevention at radio-frequency port standing-wave ratio is tried one's best is improved, so as to reduce multipath The generation of signal.
Similarly, the overall attenuation of attenuator 2+ radio-frequency cables 2+ attenuators 6 is 18dB, attenuator 3+ radio-frequency cables 3+ decay The overall attenuation of device 7 is also 18dB, can select attenuator 2, attenuator 6, attenuator 3 and attenuator 7 according to mentioned above principle Pad value.
There is the Insertion Loss of 2dB due to circulator, so the overall attenuation of attenuator 4+ radio-frequency cable 4+ attenuators 8 is 16dB, The pad value of attenuator 4, attenuator 8 can be equally selected according to mentioned above principle.
The present embodiments relate to reflector antenna 1 receive the transmitting radiofrequency signal sent of coupler 1, transmitting is penetrated Frequency signal is converted to electromagnetic radiation in space, while the electromagnetic wave in reception space, converts electromagnetic waves into reception radio frequency Signal is sent to coupler 1；Reflector antenna 2, reflector antenna 3 are similar with the effect of reflector antenna 1.
The present embodiments relate to phased array antenna receive the transmitting radiofrequency signal sent of power splitter, radio frequency will be launched Signal is converted to electromagnetic radiation in space after amplifying, while the electromagnetic wave in reception space, converts electromagnetic waves into reception Radiofrequency signal is sent to coupler 4 after amplifying.
The preferred embodiment of the present invention when multichannel transmitting-receiving time delay real-time monitoring is carried out, including calibration transceiver channel self-correcting, The calibration of standard emission passage, standard receiving channel calibration three phases are as follows：
1) transceiver channel self-correcting is calibrated, calibration receiving channel is obtained in reflecting surface inter-satellite link launching frequency and phased array star Between link RF frequency the absolute time delay of calibration receiving channel, step is as follows：
1.1) transmitting local frequency is set to reflecting surface inter-satellite link equipment tranmitting frequency；
1.2) local frequency will be received to be set to reflecting surface inter-satellite link equipment tranmitting frequency and subtract IF-FRE；
1.3) calibration transmitting baseband transmitting pseudo-code and calibration are received into Baseband Receiver pseudo-code to be set to calibrate private code；It is described Calibration private code be yard cycle for 1s is generated by m-sequence requirement binary system pseudo noise code；
1.4) calibration transmitting baseband produces calibration baseband signal to give BPSK modulators；
1.5) it is the transmitting local oscillation signal of reflecting surface inter-satellite link equipment tranmitting frequency that transmitting local oscillator produces frequency, and being sent to can Become attenuator；
1.6) variable attenuator receives the transmitting local oscillation signal that transmitting local oscillator is sent, can according to the regulation of attenuation control signal Become the pad value of attenuator, obtain the transmitting local oscillation signal after power adjustment, and the transmitting local oscillation signal is sent to BPSK modulation Device；The purpose for adjusting variable attenuator is calibration receiving channel intermediate frequency is output as the electricity that calibration receives base band ADC samplings It is flat；
1.7) BPSK modulators receive calibration baseband signal, transmitting local oscillator are received from variable attenuator from calibration transmitting baseband Signal, carries out BPSK modulation, produces calibration transmitting radiofrequency signal, and calibration transmitting radiofrequency signal is sent into three-way device；
1.8) three-way device receives calibration transmitting radiofrequency signal from BPSK modulators, and calibration transmitting radiofrequency signal is sent to respectively Frequency mixer；
1.9) it is the reception sheet that reflecting surface inter-satellite link equipment tranmitting frequency subtracts IF-FRE to receive local oscillator and produce frequency Shake signal, is sent to frequency mixer；
1.10) frequency mixer receives calibration transmitting radiofrequency signal, receives local oscillation signal from reception local oscillator from three-way device, uses Receive local oscillation signal to calibration transmitting radiofrequency signal be mixed, obtain with frequency signal and difference frequency signal, will be with frequency signal and difference Frequency signal is sent to wave filter；
1.11) wave filter is received and frequency signal and difference frequency signal from frequency mixer, carries out LPF, retains difference frequency signal, The difference frequency signal is exactly intermediate-freuqncy signal, and the intermediate-freuqncy signal is sent into amplifier；
1.12) from wave filter receiving intermediate frequency signal, the intermediate-freuqncy signal after being amplified after being amplified will amplify amplifier Intermediate-freuqncy signal afterwards is sent to calibration and receives base band；
1.13) calibration receive base band from amplifier receive amplify after intermediate-freuqncy signal, the intermediate-freuqncy signal is carried out AD samplings, Despread-and-demodulation, pseudo range measurement obtain calibrate transmission channel and calibration receiving channel closed loop time delay and；
1.14) the calibration transceiver channel closed loop time delay that will 1.13) obtain launches absolute time delay with calibration is subtracted, and obtains anti- The absolute time delay of calibration receiving channel penetrated in the inter-satellite link launching frequency of face；It is by school that absolute time delay is launched in described calibration By being obtained after software processing after the delivery outlet high sampling rate oscillograph samples storage of quasi- transceiver channel；
1.15) transmitting local frequency is set to phased array inter-satellite link rf frequency, receives local frequency and be set to phase Control battle array inter-satellite link rf frequency subtracts IF-FRE, repeats 1.1) to 1.14), you can obtain in phased array inter-satellite link radio frequency The absolute time delay of calibration receiving channel on frequency.
2) standard emission passage calibration, the transmission channel for obtaining three reflecting surface inter-satellite links and phased array inter-satellite link is exhausted To time delay, step is as follows：
2.1) transmitting local frequency is set to reflecting surface inter-satellite link tranmitting frequency, variable attenuator is arranged on 62dB and declines Downshift, makes BPSK modulators output level minimum, so that the signal of calibration transmission channel output does not influence to calibrate receiving channel Receive；
2.2) calibration reception local frequency is set to reflecting surface inter-satellite link tranmitting frequency and subtracts IF-FRE；
2.3) calibration is received into Baseband Receiver pseudo-code and is set to reflecting surface inter-satellite link emission measurement code；Chain between reflecting surface star Road emission measurement code is the inherent characteristic of reflecting surface inter-satellite link equipment；The equipment of reflecting surface inter-satellite link 1, reflecting surface inter-satellite link 2 equipment, the equipment of reflecting surface inter-satellite link 3 emission measurement code generating mode it is identical, they emission measurement code code phase when Between on have the relative time error of several chips respectively；
2.4) transmitting baseband 1 produces Cross-Link measurement to be sent with the baseband signal of communication according to radio frequency signal communication agreement between star To transmission channel 1；
2.5) transmission channel 1 receives baseband signal from transmitting baseband 1, and radio-frequency modulations, power amplification are carried out to baseband signal After obtain transmitting radiofrequency signal be sent to duplexing component 1；
2.6) duplexing component 1 receives transmitting radiofrequency signal from transmission channel 1, after being filtered to the transmitting radiofrequency signal To filtered transmitting radiofrequency signal, coupler 1 is sent to；Coupler 1 from duplexing component 1 accept filter after transmitting radio frequency letter Number, be directly sent to reflector antenna 1 all the way, another road as the equipment of reflecting surface inter-satellite link 1 transmitting radiofrequency signal, and according to Coupling ratio coupling output delivers to attenuator 5 to attenuator 1 after decaying through attenuator 1；
2.7) while, the transmitting radiofrequency signal of the equipment of reflecting surface inter-satellite link 2, through attenuator 2 decay after deliver to attenuator 6, the transmitting radiofrequency signal of the equipment of reflecting surface inter-satellite link 3 delivers to attenuator 7 after decaying through attenuator 3；
2.8) attenuator 5 receives the transmitting radiofrequency signal of the reflecting surface inter-satellite link 1 decayed by attenuator 1, through decay Device 5 delivers to branch combiner after decaying；Attenuator 6 receives the transmitting radiofrequency signal of the equipment of reflecting surface inter-satellite link 2, through attenuator Branch combiner is delivered to after 6 decay；The transmitting of the equipment of reflecting surface inter-satellite link 3 decayed by attenuator 4 is received from attenuator 7 Radiofrequency signal, branch combiner is delivered to after decaying through attenuator 7；
2.9) branch combiner receives the 3 reflecting surface inter-satellite links transmitting radio frequency after decaying from attenuator 5 to attenuator 7 Signal, is sent to three-way device after combining；
2.10) three-way device receives the 3 reflecting surface inter-satellite links transmitting radiofrequency signal after combining from branch combiner, by it Be sent to frequency mixer；
2.11) it is the reception sheet that reflecting surface inter-satellite link equipment tranmitting frequency subtracts IF-FRE to receive local oscillator and produce frequency Shake signal, is sent to frequency mixer；
2.12) frequency mixer receives reflecting surface inter-satellite link transmitting radiofrequency signal, is received from reception local oscillator from three-way device Local oscillation signal, is mixed with local oscillation signal is received to reflecting surface inter-satellite link transmitting radiofrequency signal, is obtained and frequency signal and difference Frequency signal, will be sent to wave filter with frequency signal and difference frequency signal；
2.13) wave filter is received and frequency signal and difference frequency signal from frequency mixer, carries out LPF, retains difference frequency signal, The difference frequency signal is exactly intermediate-freuqncy signal, and the intermediate-freuqncy signal is sent into amplifier；
2.14) from wave filter receiving intermediate frequency signal, the intermediate-freuqncy signal after being amplified after being amplified will amplify amplifier Intermediate-freuqncy signal afterwards is sent to calibration and receives base band；
2.15) calibration receive base band from amplifier receive amplify after intermediate-freuqncy signal, the intermediate-freuqncy signal is carried out AD samplings, Despread-and-demodulation, the emission measurement code code phase according to 3 different transmission channels of reflecting surface inter-satellite link has respectively in time The relative time error of several chips, measures 3 reflecting surface inter-satellite link transmission channels to the closed loop time delay for calibrating receiving channel successively With；
2.16) the 3 closed loop time delays that will 2.15) obtain and the calibration subtracted in reflecting surface inter-satellite link launching frequency connect The absolute time delay of passage is received, 3 reflecting surface absolute time delays of inter-satellite link transmission channel are obtained；
2.17) local frequency will be received to be set to phased array inter-satellite link rf frequency and subtract IF-FRE；
2.18) calibration is received into Baseband Receiver pseudo-code and is set to phased array inter-satellite link emission measurement code；Between phased array star Link transmissions measurement code is the inherent characteristic of phased array inter-satellite link equipment；
2.19) transmitting baseband 4 produces the baseband signal of Cross-Link measurement and communication according to radio frequency signal communication agreement between star Give transmission channel 4；
2.20) transmission channel 4 receives baseband signal from transmitting baseband 4, and radio-frequency modulations, power amplification are carried out to baseband signal After obtain transmitting radiofrequency signal be sent to power splitter；
2.21) power splitter receives transmitting radiofrequency signal from transmission channel 4, and two are obtained after carrying out branch to transmitting radiofrequency signal Radiofrequency signal is launched on road, wherein being sent to circulator all the way, another road is sent to phased array antenna；
2.22) circulator receives the transmitting radiofrequency signal after branch from power splitter, using the transmitting radiofrequency signal as phased The transmitting radiofrequency signal output of battle array inter-satellite link equipment is exported to attenuator 8 to attenuator 4 by the decay of attenuator 4；
2.23) attenuator 8 receives the transmitting radiofrequency signal of the phased array inter-satellite link decayed by attenuator 4, through decay Device 8 delivers to branch combiner after decaying；
2.24) the phased array inter-satellite link that branch combiner is received from after the decay of attenuator 8 launches radiofrequency signal, after combining It is sent to three-way device；
2.25) three-way device receives phased array inter-satellite link transmitting radiofrequency signal from branch combiner, and it is sent into frequency mixer；
2.26) it is the reception sheet that phased array inter-satellite link equipment radio frequency frequency subtracts IF-FRE to receive local oscillator and produce frequency Shake signal, is sent to frequency mixer；
2.27) frequency mixer receives phased array inter-satellite link transmitting radiofrequency signal, is received from reception local oscillator from three-way device Local oscillation signal, is mixed with local oscillation signal is received to phased array inter-satellite link transmitting radiofrequency signal, is obtained and frequency signal and difference Frequency signal, will be sent to wave filter with frequency signal and difference frequency signal；
2.28) wave filter is received and frequency signal and difference frequency signal from frequency mixer, carries out LPF, retains difference frequency signal, The difference frequency signal is exactly intermediate-freuqncy signal, and the intermediate-freuqncy signal is sent into amplifier；
2.29) from wave filter receiving intermediate frequency signal, the intermediate-freuqncy signal after being amplified after being amplified will amplify amplifier Intermediate-freuqncy signal afterwards is sent to calibration and receives base band；
2.30) calibration receive base band from amplifier receive amplify after intermediate-freuqncy signal, the intermediate-freuqncy signal is carried out AD samplings, Despread-and-demodulation, measure phased array inter-satellite link transmission channel to calibrate receiving channel closed loop time delay and；
2.31) the closed loop time delay that will 2.30) obtain and the calibration subtracted in phased array inter-satellite link launching frequency are received The absolute time delay of passage, obtains the phased array absolute time delay of inter-satellite link transmission channel；
3) standard receiving channel calibration：The receiving channel for obtaining three reflecting surface inter-satellite links and phased array inter-satellite link is exhausted To time delay, step is as follows：
3.1) set variable attenuator attenuation make branch combiner export calibration transmitting RF signal power for- 62dBm；
3.2) calibration transmitting baseband transmitting pseudo-code is set to calibrate private code；
3.3) transmitting local frequency is set to reflecting surface inter-satellite link receiving channel receives frequency；
3.4) calibration transmitting baseband produces calibration baseband signal to give BPSK modulators；
3.5) it is the transmitting local oscillation signal of reflecting surface inter-satellite link equipment receives frequency that transmitting local oscillator produces frequency, and being sent to can Become attenuator；
3.6) variable attenuator receives the transmitting local oscillation signal that transmitting local oscillator is sent, according to the attenuation for 3.1) setting to hair Penetrate local oscillation signal to be decayed, obtain the transmitting local oscillation signal after power adjustment, and the transmitting local oscillation signal is sent to BPSK tune Device processed；
3.7) BPSK modulators receive calibration baseband signal, transmitting local oscillator are received from variable attenuator from calibration transmitting baseband Signal, carries out BPSK modulation, produces calibration transmitting radiofrequency signal, and calibration transmitting radiofrequency signal is sent into three-way device；
3.8) three-way device receives calibration transmitting radiofrequency signal from BPSK modulators, and calibration transmitting radiofrequency signal is sent to respectively Branch combiner；
3.9) branch combiner receives calibration transmitting radiofrequency signal from three-way device, and calibration transmitting radiofrequency signal is sent into decay Device 5, attenuator 6, attenuator 7, attenuator 8；
3.10) attenuator 5 receives calibration transmitting radiofrequency signal from branch combiner, and decay is delivered to after decaying through attenuator 5 Device 1；Attenuator 6 receives calibration transmitting radiofrequency signal from branch combiner, and attenuator 2 is delivered to after decaying through attenuator 6；Attenuator 7 receive calibration transmitting radiofrequency signal from branch combiner, and attenuator 3 is delivered to after decaying through attenuator 7；Attenuator 8 is closed from branch Road device receives calibration transmitting radiofrequency signal, and attenuator 4 is delivered to after decaying through attenuator 8；
3.11) attenuator 1 receives the calibration transmitting radiofrequency signal decayed by attenuator 5, is delivered to after decaying through attenuator 1 Coupler 1；
3.12) coupler 1 receives calibration transmitting radiofrequency signal from attenuator 1, and the calibration that will be received according to coupling ratio is sent out Penetrate signal and be sent to duplexing component 1；
3.13) duplexing component 1 receives calibration transmission signal from coupler 1, and filtered school is obtained after being filtered to it Quasi- transmission signal, is sent to receiving channel 1；
3.14) receiving channel 1 from duplexing component 1 accept filter after calibration transmission signal, it is amplified, is filtered, Intermediate-freuqncy signal is obtained after down coversion, reception base band 1 is sent to；
3.15) base band 1 is received from the receiving intermediate frequency signal of receiving channel 1, and AD samplings, despreading solution are carried out to the intermediate-freuqncy signal Adjust, pseudo range measurement obtain calibrate transmission channel to the receiving channel of reflecting surface inter-satellite link 1 closed loop time delay and；
3.16) according to 3.11) to flow 3.15), reception base band 2 obtains calibration transmission channel to reflecting surface inter-satellite link The closed loop time delay of 2 receiving channels is with reception base band 3 obtains calibrating transmission channel closing to the receiving channel of reflecting surface inter-satellite link 3 Ring time delay and；
3.17) by step 3.15) and 3.16) 3 closed loop time delays obtaining and the calibration absolute time delay of transmission channel is subtracted, obtain To 3 reflecting surface absolute time delays of inter-satellite link receiving channel；
3.18) calibration transmitting local frequency is set to phased array link RF frequency；
3.19) attenuator 4 receives the calibration transmitting radiofrequency signal decayed by attenuator 8, is delivered to after decaying through attenuator 4 Circulator；
3.20) circulator receives the calibration transmitting radiofrequency signal sent from attenuator 4 simultaneously, by calibration transmitting radio frequency letter Number it is sent to coupler 4；
3.21) coupler 4 receives the calibration transmission signal sent from circulator according to coupling ratio, the calibration hair that will be received Penetrate signal and be sent to receiving channel 4；
3.22) receiving channel 4 receives calibration transmission signal from coupler 4, they is amplified, is filtered, down coversion After obtain intermediate-freuqncy signal, be sent to reception base band 4；
3.23) base band 4 is received from the receiving intermediate frequency signal of receiving channel 4, and AD samplings, despreading solution are carried out to the intermediate-freuqncy signal Adjust, pseudo range measurement calibrate transmission channel to phased array inter-satellite link receiving channel closed loop time delay and；
3.24) by step 3.23) the closed loop time delay that obtains and the calibration absolute time delay of transmission channel is subtracted, obtain phased array star Between the absolute time delay of link receiving channel.
Each transmission channel of reflecting surface inter-satellite link of table 1 and the absolute delay testing result (ns) of receiving channel
Note 1：It is due in order to be able to pass through code division in time-delay calibration that the transmitting time delay difference of reflecting surface link 1,2,3 is larger Multiple access distinguishes what 1,2,3 this 3 road signal were deliberately so designed.
The phased array inter-satellite link transmission channel of table 2 and the absolute delay testing result (ns) of receiving channel
During the Beidou II second phase whole star normal temperature of Navigation Satellite and thermal vacuum test, to reflecting surface inter-satellite link Transmission channel and the reception of 1 equipment, the equipment of reflecting surface inter-satellite link 2, the equipment of reflecting surface inter-satellite link 3 and phased array inter-satellite link The absolute time delay of passage is tested, and test result is shown in Tables 1 and 2；Effectively carried by the visible inter-satellite link subsystem of test result Lotus " measurement B classes uncertainty "≤0.46ns, meets technical requirement (≤0.5ns), is not calibrated compared to tradition Accuracy improves more than five times.The method is Beidou II second phase Navigation Satellite inter-satellite link subsystem payload Smoothly develop and provide technical support.

Claims (8)

1. a kind of with the multichannel transmitting-receiving time delay real-time monitoring system for calibrating transceiver channel, it is characterised in that：Including：Reflecting surface Inter-satellite link equipment, phased array inter-satellite link equipment, calibration transceiver channel, attenuator group, radio-frequency cable；
Attenuator group includes：Attenuator 1, attenuator 2, attenuator 3, attenuator 4, attenuator 5, attenuator 6, attenuator 7, decay Device 8；
Reflecting surface inter-satellite link equipment, including：The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2, reflecting surface star Between the equipment of link 3；The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2 and the equipment of reflecting surface inter-satellite link 3 composition It is all identical with function；
The equipment of reflecting surface inter-satellite link 1, including：Transmitting baseband 1, reception base band 1, transmission channel 1, receiving channel 1, duplexing component 1st, coupler 1, reflector antenna 1；
It is logical that transmitting baseband 1 produces Cross-Link measurement to give transmitting with the baseband signal of communication according to radio frequency signal communication agreement between star Road 1；Transmission channel 1 receives baseband signal from transmitting baseband 1, is sent out after carrying out radio-frequency modulations, power amplification to baseband signal Penetrate radiofrequency signal and be sent to duplexing component 1；Duplexing component 1 receives transmitting radiofrequency signal from transmission channel 1, to the transmitting radiofrequency signal Filtered transmitting radiofrequency signal is obtained after being filtered, coupler 1 is sent to；After coupler 1 accepts filter from duplexing component 1 Transmitting radiofrequency signal, is directly sent to reflector antenna 1 all the way, another road as the equipment of reflecting surface inter-satellite link 1 transmitting radio frequency Signal, and according to coupling ratio coupling output to attenuator 1, attenuator 5 is delivered to after decaying through attenuator 1, coupler 1 is received simultaneously From the reception radiofrequency signal that reflector antenna 1 is received, while receiving the calibration transmitting sent from attenuator 1 also according to coupling ratio Signal, the reception radiofrequency signal that will be received and calibration transmission signal are sent to duplexing component 1；Duplexing component 1 is received from coupler 1 To radiofrequency signal and calibration transmission signal is received, filtered reception radiofrequency signal is obtained after being filtered to them and calibration is sent out Signal is penetrated, receiving channel 1 is sent to；Receiving channel 1 from duplexing component 1 accept filter after reception radiofrequency signal and calibration transmitting letter Number, they are amplified, are filtered, obtaining intermediate-freuqncy signal after down coversion, it is sent to reception base band 1；Receive base band 1 from receiving channel 1 receiving intermediate frequency signal, AD samplings, despread-and-demodulation, pseudo range measurement is carried out to the intermediate-freuqncy signal and obtains being communicated between interstellar distance and star Data, while also obtaining calibrating transmission channel to the receiving channel closed loop time delay and measurement data of the equipment of reflecting surface inter-satellite link 1； Reflector antenna 1 receives the transmitting radiofrequency signal that coupler 1 is sent, and transmitting radiofrequency signal is converted into electromagnetic radiation to space In, while the electromagnetic wave in reception space, converts electromagnetic waves into reception radiofrequency signal and is sent to coupler 1；
The transmitting radiofrequency signal output of the equipment of reflecting surface inter-satellite link 2 delivers to attenuator to attenuator 2 after decaying through attenuator 2 6；
The transmitting radiofrequency signal output of the equipment of reflecting surface inter-satellite link 3 delivers to attenuator to attenuator 3 after decaying through attenuator 3 7；
Phased array inter-satellite link equipment, including：Transmitting baseband 4, reception base band 4, transmission channel 4, receiving channel 4, power splitter, coupling Clutch 4, circulator, phased array antenna；
It is logical that transmitting baseband 4 produces Cross-Link measurement to give transmitting with the baseband signal of communication according to radio frequency signal communication agreement between star Road 4；Transmission channel 4 receives baseband signal from transmitting baseband 4, is sent out after carrying out radio-frequency modulations, power amplification to baseband signal Penetrate radiofrequency signal and be sent to power splitter；Power splitter receives transmitting radiofrequency signal from transmission channel 4, and branch is carried out to transmitting radiofrequency signal After obtain two-way transmitting radiofrequency signal, wherein being sent to circulator all the way, another road is sent to phased array antenna；Circulator is from power splitter Receive branch after transmitting radiofrequency signal, using the transmitting radiofrequency signal as phased array inter-satellite link equipment transmitting radiofrequency signal Attenuator 4 is exported, by the decay output of attenuator 4 to attenuator 8, circulator receives the calibration sent from attenuator 4 simultaneously Transmitting radiofrequency signal, coupler 4 is sent to by calibration transmitting radiofrequency signal；Coupler 4 receives what is received from phased array antenna Radiofrequency signal is received, while receiving the calibration transmission signal sent from circulator also according to coupling ratio, the reception that will be received is penetrated Frequency signal and calibration transmission signal are sent to receiving channel 4；Receiving channel 4 receives reception radiofrequency signal and calibration from coupler 4 They are amplified, filtered, obtaining intermediate-freuqncy signal after down coversion by transmission signal, are sent to reception base band 4；Base band 4 is received from connecing The receiving intermediate frequency signal of passage 4 is received, AD samplings, despread-and-demodulation, pseudo range measurement is carried out to the intermediate-freuqncy signal and is obtained interstellar distance and star Between communication data, while also obtain calibrate closed-loop measuring data；Phased array antenna receives the transmitting radiofrequency signal that power splitter is sent, Will transmitting radiofrequency signal amplify after be converted to electromagnetic radiation in space, while the electromagnetic wave in reception space, by electromagnetic wave Be converted to after reception radiofrequency signal is amplified and be sent to coupler 4；
Calibration transceiver channel, including：Calibration transmission channel, calibration receiving channel, three-way device, branch combiner；Its alignment is sent out Penetrating passage includes：Calibration transmitting baseband, transmitting local oscillator, variable attenuator, BPSK modulators, calibration receiving channel include：Calibration Receive base band, receive local oscillator, frequency mixer, wave filter, amplifier；
Calibration transmitting baseband produces calibration baseband signal to give BPSK modulators；Transmitting local oscillator is according to calibration tranmitting frequency control letter Number produce corresponding frequencies transmitting local oscillation signal, be sent to variable attenuator；Variable attenuator receives the transmitting that transmitting local oscillator is sent Local oscillation signal, the pad value of variable attenuator is adjusted according to outside attenuation control signal, obtains the transmitting after power adjustment Local oscillation signal, and the transmitting local oscillation signal is sent to BPSK modulators；BPSK modulators receive calibration base from calibration transmitting baseband Band signal, transmitting local oscillation signal is received from variable attenuator, carry out BPSK modulation, produce calibration transmitting radiofrequency signal, will calibrated Transmitting radiofrequency signal is sent to three-way device；Three-way device receives calibration transmitting radiofrequency signal from BPSK modulators, by calibration transmitting radio frequency Signal is sent to frequency mixer and branch combiner respectively, while inter-satellite link transmitting radiofrequency signal also is received from branch combiner, and Inter-satellite link transmitting radiofrequency signal is sent to frequency mixer；Branch combiner receives calibration transmitting radiofrequency signal from three-way device, to school Quasi- transmitting radiofrequency signal is sent to attenuator 5, attenuator 6, attenuator 7, attenuator 8 after carrying out branch, while attenuator 5 receives warp Overdamping device 1 decay reflecting surface inter-satellite link 1 transmitting radiofrequency signal through attenuator 5 decay after deliver to branch combiner, from Attenuator 6 receive the equipment of reflecting surface inter-satellite link 2 transmitting radiofrequency signal decay through attenuator 6 after deliver to branch combiner, from Attenuator 7 is received after the transmitting radiofrequency signal of the equipment of reflecting surface inter-satellite link 3 of the decay of attenuator 4 decays through attenuator 7 Branch combiner, the transmitting radiofrequency signal from the reception phased array inter-satellite link equipment of attenuator 8 is delivered to be sent after decaying through attenuator 8 To branch combiner, after the 4 inter-satellite links transmitting radiofrequency signal combining after branch combiner attenuator 5 to the decay of attenuator 8 It is sent to three-way device；
The reception local oscillation signal that local oscillator produces corresponding frequencies according to outside calibration receives frequency control signal is received, mixing is sent to Device；Frequency mixer receives calibration transmitting radiofrequency signal and inter-satellite link transmitting radiofrequency signal, is connect from reception local oscillator from three-way device Local oscillation signal is received, calibration transmitting radiofrequency signal and inter-satellite link transmitting radiofrequency signal are mixed with local oscillation signal is received, obtained To with frequency signal and difference frequency signal, wave filter will be sent to frequency signal and difference frequency signal；Wave filter is received from frequency mixer and frequency is believed Number and difference frequency signal, carry out LPF, retain difference frequency signal, the difference frequency signal is exactly intermediate-freuqncy signal, and the intermediate-freuqncy signal is sent To amplifier；Amplifier is from wave filter receiving intermediate frequency signal, the intermediate-freuqncy signal after being amplified after being amplified, after amplification Intermediate-freuqncy signal is sent to calibration and receives base band；Calibration receives base band and receives the intermediate-freuqncy signal after amplifying from amplifier, and the intermediate frequency is believed AD samplings, despread-and-demodulation, pseudo range measurement number is carried out to obtain calibrating closed-loop measuring data.
2. according to claim 1 a kind of with the multichannel transmitting-receiving time delay real-time monitoring system for calibrating transceiver channel, its It is characterised by：Attenuator 1, attenuator 2, attenuator 3, attenuator 4, attenuator 5, attenuator 6, attenuator 7, attenuator 8, radio frequency Cable 1, radio-frequency cable 2, radio-frequency cable 3, radio-frequency cable 4 are used to realize reflecting surface inter-satellite link equipment, phased array inter-satellite link Equipment and the two-way radio-frequency signal transmission of calibration transceiver channel, according to cable attenuation amount, the attenuator different by configuring pad value The radio-frequency power of each link entrance is can configure, calibration is launched radiofrequency signal does not influence between reflecting surface inter-satellite link and phased array star Link is normally received, and to calibrate receiving channel can also normally receive the hair of reflecting surface inter-satellite link and phased array inter-satellite link Penetrate radiofrequency signal.
3. according to claim 1 a kind of with the multichannel transmitting-receiving time delay real-time monitoring system for calibrating transceiver channel, its It is characterised by：Reflecting surface inter-satellite link equipment includes：The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2, reflection The equipment of face inter-satellite link 3；The equipment of reflecting surface inter-satellite link 1, the equipment of reflecting surface inter-satellite link 2 and the equipment of reflecting surface inter-satellite link 3 Composition and function are all identical, and they are also identical with the connected mode of calibration transceiver channel, and their passage transmitting-receiving time delay is real-time Monitoring method is also identical.
4. according to claim 1 a kind of with the multichannel transmitting-receiving time delay real-time monitoring system for calibrating transceiver channel, its It is characterised by：Radio-frequency cable includes：Radio-frequency cable 1, radio-frequency cable 2, radio-frequency cable 3 and radio-frequency cable 4；Wherein attenuator 1, penetrate Frequency cable 1, attenuator 5 are provided commonly for the equipment of connection reflecting surface inter-satellite link 1 to calibrating transceiver channel；Attenuator 2, radio-frequency cable 2nd, attenuator 6 is used to connect the equipment of reflecting surface inter-satellite link 2 to calibrating transceiver channel；Attenuator 3, radio-frequency cable 3, attenuator 6 For connecting the equipment of reflecting surface inter-satellite link 3 to calibrating transceiver channel；Attenuator 4, radio-frequency cable 4, attenuator 8 are used to connect phase Control battle array inter-satellite link equipment is to calibrating transceiver channel.
5. according to claim 1 a kind of with the multichannel transmitting-receiving time delay real-time monitoring system for calibrating transceiver channel, its It is characterised by：Circulator is a three port passive devices, including port 1, port 2 and port 3, from the signal of the input of port 1 Exported from port 2, exported from port 3 from the signal of the input of port 2, for the Path selection of radiofrequency signal, be input to output Insertion Loss is 2dB.
6. according to claim 1 a kind of with the multichannel transmitting-receiving time delay real-time monitoring system for calibrating transceiver channel, its It is characterised by：The maximum attenuation amount of variable attenuator is 62dB, decay stepping 1dB.
7. according to claim 1 a kind of with the multichannel transmitting-receiving time delay real-time monitoring system for calibrating transceiver channel, its It is characterised by：Transmitting local oscillator can produce any one in three frequencies RF1, RF2, RF3, by the calibration tranmitting frequency of 2bit Control signal is selected, and receives local oscillator three frequency RF1 can be produced to subtract intermediate frequency, RF2 and subtract intermediate frequency, RF3 and subtract intermediate frequency In any one, selected by the calibration receives frequency control signal of 2bit.
8. it is a kind of with the multichannel transmitting-receiving time delay method of real-time for calibrating transceiver channel, it is characterised in that to be received and dispatched including calibration Passage self-correcting, the calibration of standard emission passage, standard receiving channel calibration three phases are as follows：
1) transceiver channel self-correcting is calibrated, obtains calibrating receiving channel chain between reflecting surface inter-satellite link launching frequency and phased array star The absolute time delay of calibration receiving channel of road RF spot, step is as follows：
1.1) transmitting local frequency is set to reflecting surface inter-satellite link equipment tranmitting frequency；
1.2) local frequency will be received to be set to reflecting surface inter-satellite link equipment tranmitting frequency and subtract IF-FRE；
1.3) adjustment variable attenuator enables calibration receiving channel intermediate frequency to be output as the level that calibration receives base band ADC samplings；
1.4) after calibration transmitting baseband transmitting pseudo-code being set into calibration private code with calibration reception Baseband Receiver pseudo-code, school is measured Quasi- transceiver channel closed loop time delay and；The binary system puppet that described calibration private code is yard cycle generate by m-sequence requirement for 1s with Machine code；
1.5) calibration transceiver channel closed loop time delay is launched into absolute time delay with calibration is subtracted, obtains launching in reflecting surface inter-satellite link The absolute time delay of calibration receiving channel on frequency；
1.6) transmitting local frequency is set to phased array inter-satellite link rf frequency, receives local frequency and be set to phased array star Between link RF frequency subtract IF-FRE, repeat 1.1) to 1.5), that is, obtaining on phased array inter-satellite link RF spot The calibration absolute time delay of receiving channel；
2) calibration of standard emission passage, obtains the transmission channel absolute time of three reflecting surface inter-satellite links and phased array inter-satellite link Prolong, step is as follows：
2.1) transmitting local frequency is set to reflecting surface inter-satellite link tranmitting frequency, variable attenuator is arranged on 62dB decay Shelves, make BPSK modulators output level minimum, so that the signal of calibration transmission channel output does not influence to calibrate connecing for receiving channel Receive；
2.2) calibration reception local frequency is set to reflecting surface inter-satellite link tranmitting frequency and subtracts IF-FRE；
2.3) calibration is received into Baseband Receiver pseudo-code and is set to reflecting surface inter-satellite link emission measurement code；Reflecting surface inter-satellite link is sent out Penetrate the inherent characteristic that measurement code is reflecting surface inter-satellite link equipment；The equipment of reflecting surface inter-satellite link 1, reflecting surface inter-satellite link 2 set Standby, the equipment of reflecting surface inter-satellite link 3 emission measurement code generating mode is identical, and their emission measurement code code phase is in time There is the relative time error of several chips respectively；
2.4) now, calibration receiving channel in frequency and pseudo-code from 3 different transmission channels all structures of reflecting surface inter-satellite link Into pair relationhip, the emission measurement code code phase according to 3 different transmission channels of reflecting surface inter-satellite link divides in time There is not the relative time error of several chips, 3 reflecting surface inter-satellite link transmission channels to the closed loop for calibrating receiving channel are measured successively Time delay and；
2.5) by step 2.4) the 3 closed loop time delays for obtaining and the calibration reception subtracted in reflecting surface inter-satellite link launching frequency The absolute time delay of passage, obtains 3 reflecting surface absolute time delays of inter-satellite link transmission channel；
2.6) local frequency will be received to be set to phased array inter-satellite link rf frequency and subtract IF-FRE；
2.7) calibration is received into Baseband Receiver pseudo-code and is set to phased array inter-satellite link emission measurement code；Phased array inter-satellite link is sent out Penetrate the inherent characteristic that measurement code is phased array inter-satellite link equipment；
2.8) now, transmission channel of the calibration receiving channel with phased array inter-satellite link equipment in frequency and pseudo-code is all constituted Pair relationhip, measure phased array inter-satellite link transmission channel to calibrate receiving channel closed loop time delay and；
2.9) by step 2.8) the closed loop time delay that obtains and the calibration that subtracts on phased array inter-satellite link RF spot receive logical The absolute time delay in road, obtains the phased array absolute time delay of inter-satellite link transmission channel；
3) standard receiving channel calibration：Obtain the receiving channel absolute time of three reflecting surface inter-satellite links and phased array inter-satellite link Prolong, step is as follows：
3.1) set the attenuation of variable attenuator to make branch combiner export calibration transmitting RF signal power is -62dBm；
3.2) calibration transmitting baseband transmitting pseudo-code is set to calibrate private code；
3.3) transmitting local frequency is set to reflecting surface inter-satellite link receiving channel receives frequency；
3.4) now, calibration transmission channel is all constituted with the receiving channel of 3 reflecting surface inter-satellite link equipment in frequency and matched somebody with somebody To relation, base band 1 is received to base band 3 is received and measures calibration transmission channel to 3 reflecting surface inter-satellite link receiving channels successively Closed loop time delay and；
3.5) by step 3.4) 3 closed loop time delays obtaining and the calibration absolute time delay of transmission channel is subtracted, obtain 3 reflecting surface stars Between the absolute time delay of link receiving channel；
3.6) calibration transmitting local frequency is set to phased array link RF frequency；
3.7) now, calibration transmission channel constitutes pairing with the receiving channel of phased array inter-satellite link equipment in frequency and closes System, receive base band 4 measure calibration transmission channel to phased array inter-satellite link receiving channel closed loop time delay and；
3.8) by step 3.7) the closed loop time delay that obtains and the calibration absolute time delay of transmission channel is subtracted, obtain phased array inter-satellite link The absolute time delay of receiving channel.
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