CN114499637A - Method and system for implementing data transmission satellite-ground butt joint between ground receiving station and satellite - Google Patents
Method and system for implementing data transmission satellite-ground butt joint between ground receiving station and satellite Download PDFInfo
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Abstract
The invention provides a method and a system for implementing data transmission satellite-ground butt joint of a ground receiving station and a satellite, wherein the method comprises the following steps: self-checking the state of the ground data transmission satellite-ground docking system; detecting a satellite-ground interface and performance in a wired state; aligning the satellite-ground antenna; power level scaling; and detecting the satellite-ground interface and the performance in a wireless state. The detection of the satellite-ground interface and the performance in the wired state comprises the detection of the matching of transmitting and receiving frequency spectrums, the detection of the matching of interfaces such as transmitting and receiving code rate, a modulation and demodulation mode, a coding and decoding mode, a scrambling and descrambling mode, code pattern matching and the like, and the detection of the satellite-ground combined error rate. The detection of the satellite-ground interface and the performance in a wireless state comprises the detection of transmitting and receiving frequency spectrum, the detection of interface matching such as transmitting and receiving code rate, modulation and demodulation mode, coding and decoding mode, scrambling and descrambling mode, code pattern matching and the like, and the detection of satellite-ground synthetic cross polarization discrimination (XPD) and error rate. The invention has positive effect on the test of data transmission satellite-ground butt joint of the ground receiving station and the satellite in the field of satellite data receiving.
Description
Technical Field
The invention relates to a method and a system for implementing data transmission satellite-ground butt joint between a ground receiving station and a satellite, belonging to the field of satellite data receiving.
Background
The satellite data transmission system-free space-ground receiving station three-part form information transmission link for obtaining satellite downlink data. The parameters of the satellite data transmission system are: EIRP, carrier frequency, modulation mode, code rate, antenna polarization discrimination rate, transmission bandwidth and the like. The ground receiving system parameters are as follows: G/T value, operating bandwidth, demodulation loss, etc. The free space has a large difference due to different geographic environments, and statistical analysis needs to be performed according to factors such as geography, weather and environment of specific positions to obtain related data. Therefore, the variation of many parameters of the satellite and the ground can directly affect whether the ground receiving station can finally correctly recover the demodulated satellite data.
The data transmission interface between the satellite and the ground receiving station is the first key technical link in the multi-satellite-ground interfaces. Before satellite transmission, a satellite-ground data transmission link is established, a satellite-ground data transmission interface is verified, the matching performance of functions of satellite radio frequency signal transmission, ground receiving station receiving, demodulation and the like is detected, and the satellite data can reliably fall to the ground. It is critical and essential how to properly and efficiently authenticate the multi-satellite data transmission interfaces.
In addition, the ability of satellites to acquire information is increasing, and the amount of data is increasing. The contradiction between the amount of raw data and the data transmission capability is increasingly becoming apparent. At present, the main technical means for improving the data transmission capability of the remote sensing satellite are as follows: data compression, use of a high-order modulation technology, improvement of a data transmission carrier frequency band, polarization multiplexing transmission mode and the like. With the increasing number of on-orbit satellites, frequency resources are in more shortage, and the polarization multiplexing transmission technology is used by more and more remote sensing satellites.
Polarization multiplexing is a method of multiplexing signals using polarization characteristics of electromagnetic waves. Two orthogonal polarized waves are used at the same frequency, and two groups of independent signals are transmitted simultaneously, so that the data transmission efficiency can be doubled. When the system uses polarization multiplexing, it is necessary to have a certain cross-polarization discrimination for both the satellite and the ground receiving station to prevent inter-polarization interference. Because the satellite and the ground receiving station continuously move during data downloading, the space propagation link can bring depolarization effect to electromagnetic waves, and certain uncertainty is brought to polarization multiplexing transmission. And for the polarization multiplexing transmission mode of the satellite, qualitative and quantitative analysis and verification of the polarization multiplexing transmission mode are also the precondition guarantee that the satellite acquires effective information and safely and reliably returns the effective information to the ground. How to qualitatively and quantitatively analyze the polarization multiplexing transmission mode is also an indispensable content for implementing data transmission satellite-to-ground docking.
In the above, many parameter analyses and interface matching for the satellite-ground data transmission link need to be completed by data transmission satellite-ground docking. How to accurately, effectively and comprehensively complete the verification and how to build a ground data transmission satellite-ground docking system become an urgent problem to be solved.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method and a system for implementing data transmission satellite-ground docking between a ground receiving station and a satellite. Wherein,
according to one aspect, the present invention provides a method for implementing data-transfer satellite-ground docking of a ground receiving station and a satellite, comprising the steps of:
step 1: self-checking the state of the ground data transmission satellite-ground docking system;
step 2: detecting a satellite-ground interface and performance in a wired state;
and step 3: aligning the satellite-ground antenna;
and 4, step 4: scaling the power level;
and 5: and the wireless state detects the satellite-ground interface and the performance.
According to another aspect of the present invention, there is provided a system for implementing satellite-to-satellite docking with a ground receiving station, mainly comprising:
and the ground receiving antenna is used for tracking and receiving the radio frequency signals transmitted by the satellite. The ground receiving antenna has orthogonal polarization multiplexing receiving capability and can capture and receive polarization multiplexing signals transmitted by a satellite. When the data transmission satellite-ground docking is implemented, the antenna is controlled to point to the satellite.
And the channel equipment is used for converting the radio frequency signals received by the antenna into intermediate frequency signals.
The channel equipment preferably comprises an optical transmission unit, a radio frequency switch unit, a low noise amplification unit, a frequency conversion unit and an intermediate frequency switch unit.
The optical end transmission unit comprises a pair of optical transmitting units and optical receiving units, is respectively used in a ground receiving antenna tower footing and a receiving machine room, and is used for transmitting the radio frequency signals received by the ground receiving antenna tower footing to the receiving machine room through optical fibers; the radio frequency switch matrix is used for controlling the on-off, transmission and exchange of signals at a radio frequency end; the low-noise amplification unit is used for further amplifying the radio-frequency signals received by the ground receiving antenna; the frequency conversion unit is used for down-converting the radio frequency signals received by the ground receiving antenna to intermediate frequency for further processing; and the intermediate frequency switch unit is used for controlling the on-off, transmission and exchange of signals at the intermediate frequency end.
And the ground demodulator is used for demodulating and processing the satellite transmitting signal at the intermediate frequency end. The ground demodulator can verify key satellite-ground interface parameters such as a modulation coding mode, a scrambling mode, a code rate and the like.
And the data recorder is used for recording, landing and storing the original data obtained by the processing of the ground demodulator. And the data recorder completes the bit error rate statistics of the PN code or the fixed frame data.
And the radio frequency cable is used for connecting the satellite related equipment to the ground receiving antenna coupling port.
And the frequency spectrograph is used for calibrating and measuring related power levels. The spectrometer has a proper dynamic range and measurement accuracy.
And the uplink test link is used for self-checking the state of the ground data transmission satellite-ground docking system.
Preferably, the uplink test link includes a signal source/modulation unit, an up-conversion unit, and an optical transmission unit.
The signal source/modulation unit is used for generating a signal for the ground satellite-ground docking system to complete system state self-checking; the up-conversion unit is used for converting the frequency of the signal generated by the signal source/modulation unit to radio frequency; the optical transmission unit comprises a pair of optical transmitting units and optical receiving units, which are respectively used in a receiving machine room and a ground receiving antenna tower footing and are used for optical transmission of the uplink test signal.
The guarantee equipment is used for guaranteeing and assisting equipment when the ground receiving station is in data transmission satellite-ground butt joint with a satellite, and improves the safety and operability of the equipment.
Has the advantages that:
the invention builds a ground data transmission satellite-ground docking system and provides a method for implementing data transmission satellite-ground docking between a ground receiving station and a satellite based on the requirement of actual engineering in the field of satellite data receiving, and the method has actual operability. The method solves the matching verification work of a plurality of parameters and interfaces of the satellite-ground data transmission link in the satellite-ground butt joint, provides advanced data support for the on-orbit operation after the satellite is transmitted, and simultaneously provides powerful guarantee for the actual ground receiving station to receive the satellite data. In addition, a related satellite-ground synthesis XPD test method is provided for the dual-polarized satellite, the usability of the polarization multiplexing data transmission mode is verified, and the smooth implementation of the polarization multiplexing data transmission mode is ensured.
Drawings
The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a system for interfacing a ground receiving station with a satellite implementing satellite-to-ground data transmission links according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for interfacing a ground receiving station with a satellite implementing satellite-to-ground data transmission links according to an embodiment of the present invention;
FIG. 3 is a graph of the results of left and right rotation XPD for satellite-to-ground antenna alignment and satellite antenna bias, in accordance with an embodiment of the present invention;
FIG. 4 is a graph of left-right rotation XPD results for satellite-to-ground antenna alignment and ground antenna offset, in accordance with an embodiment of the present invention.
Detailed Description
Embodiments of the method and system for implementing data-transfer satellite-ground interfacing between a ground receiving station and a satellite according to the present invention will be described with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.
The data transmission satellite-ground butt joint implemented by the ground receiving station and the satellite can verify the matching and consistency of various parameters and interfaces of the satellite-ground data transmission link. The method and the system are important links for ensuring that the ground receiving station successfully receives the satellite data.
Fig. 1 is a schematic diagram illustrating a system for implementing data transmission satellite-ground docking between a ground receiving station and a satellite according to an embodiment of the present invention. As shown in fig. 1, the ground data-transmission satellite-ground docking system includes:
and the ground receiving antenna is used for tracking and receiving the radio frequency signals transmitted by the satellite. The ground receiving antenna has left-right double circular polarization receiving capability and can capture and receive left-hand signals and right-hand signals sent by a satellite.
In a preferred embodiment, the ground receiving antenna is a cassegrain double-reflector antenna, has the caliber of 12 meters, works in an X frequency band, and can receive circularly polarized signals of left and right circles of the X frequency band. The ground receiving antenna is composed of an antenna feeder unit, a seat frame unit, a servo control unit and the like. The antenna feed unit mainly comprises a multi-band feed horn, a synthesis network, a tracking network, a switch and the like; the seat frame unit mainly comprises a double-reflector antenna structure, an azimuth-elevation-inclination three-axis antenna seat framework, a transmission device, an angular position sensor, a control and protection device and the like; the servo unit mainly comprises an antenna driving device, a servo motor, an antenna control device, a shaft angle encoder, the remote control power-on device and the like.
And the channel equipment is used for converting the radio frequency signals received by the antenna into intermediate frequency signals.
In a preferred embodiment, the channel equipment includes optical transceivers (including transmit and receive), Low Noise Amplifiers (LNAs), radio frequency switch matrices, and down converters. In this embodiment, the signals between the ground receiving antenna and the receiving machine room are transmitted by optical fibers, and the transmission of the signals from the ground receiving antenna to the receiving machine room is completed by using the optical transmitter-optical fiber-optical receiver. The radio frequency switch matrix can realize the on-off, transmission and full exchange of a radio frequency end of a channel link; the Low Noise Amplifier (LNA) works in a frequency band, and can further amplify weak radio frequency signals; the down converter down converts the satellite X frequency band data transmission signal to an intermediate frequency 1.2GHz signal, and provides the intermediate frequency signal to the demodulator for corresponding processing; the intermediate frequency balance switch matrix has a signal balance function and can realize the on-off, transmission and full exchange of a channel link in an intermediate frequency band.
And the ground demodulator is used for demodulating the intermediate frequency signal which is subjected to frequency conversion by the down converter. The ground demodulator performs matching setting on satellite-ground key radio frequency interfaces such as a modulation and demodulation mode, a coding and decoding mode, a scrambling and descrambling mode, a code rate and the like, and realizes verification of interface matching and consistency by comparing demodulated data.
In a preferred embodiment, the ground demodulator is a dual-channel all-digital demodulator, can adapt to various modulation modes such as BPSK, QPSK, OQPSK (SQPSK), 8PSK, 16APSK, 16QAM and the like, and has the expansion capability on other high-order modulation; the maximum symbol rate of the demodulator is 500Msps, and the demodulator has the expansion capability for higher symbol rate; supporting a scrambling mode or custom scrambling recommended by the CCSDS standard; various decoding modes such as Viterbi, RS, Viterbi and RS cascade connection, LDPC and the like recommended by the CCSDS standard are supported; the local data storage function is provided.
And the data recorder is used for recording, disking and storing the data obtained by the processing of the ground demodulator and finishing the error rate statistics of the PN code or the fixed frame data.
In a preferred embodiment, the data recorder can support error rate statistics of various PN codes such as PN7, PN9, PN15, PN23, PN31 and the like; and the error rate statistics of the fixed frame data filled with various custom filling modes such as '5A' and 'AA' are supported.
And the radio frequency cable is used for connecting the satellite related equipment to the ground receiving antenna coupling port.
In a preferred embodiment, the radio frequency cable has a length of 20 meters and the radio frequency cable loss is no greater than 20dB in the X band.
And the frequency spectrograph is used for calibrating and measuring related power levels. In a preferred embodiment, the chosen spectrometer supports X-band measurements with a spurious-free dynamic range of 75dBc and an amplitude measurement accuracy of + -0.19 dB.
And the uplink test link is used for self-checking the state of the ground satellite-ground docking system. In a preferred embodiment, the uplink test link includes a modulator, an up-converter, and an optical transceiver (including transmit and receive). The modulator can support multiple modulation modes such as BPSK, QPSK, OQPSK (SQPSK), 8PSK, 16APSK, 16QAM and the like, support multiple decoding modes such as Viterbi, RS, Viterbi and RS cascade, LDPC and the like recommended by CCSDS standard, and support the broadcasting of a custom data file. The up-converter is used for up-converting the intermediate frequency signal sent from the modulator to radio frequency; the optical transmission unit is used for receiving signal transmission of the machine room and the ground receiving antenna tower footing.
The guarantee equipment is used for guaranteeing and assisting equipment when the ground receiving station is in data transmission satellite-ground butt joint with a satellite, and improves the safety and operability of the equipment. In a preferred embodiment, the equipment used for security is intercom equipment, rain fly, transport vehicles, etc.
Fig. 2 is a flowchart illustrating a method for interfacing a ground receiving station with a satellite via a satellite data transmission link according to an embodiment of the present invention. As shown in fig. 2, the method for implementing data satellite-to-satellite docking between a ground receiving station and a satellite includes:
step 1: and carrying out state self-checking on the ground data transmission satellite-ground docking system.
1a, checking key equipment such as a ground receiving antenna, a demodulator and the like to ensure that the grade performance of the ground data transmission satellite-ground butt joint system equipment is good;
1b, checking the states of the intermediate frequency link and the radio frequency link to ensure that the link level performance of the ground data transmission satellite-ground docking system is good;
1c, checking the system state to ensure that the ground data transmission satellite-ground butt joint system has good G/T value, servo control and error code performance;
and 1d, checking environmental parameters such as power supply, grounding and the like to ensure that the butt joint environment of the ground receiving station and the satellite is good.
Step 2: and detecting the satellite-ground interface and the performance in a wired state.
In a preferred embodiment, the wired state docking detection includes three items of interface matching detection such as transmission-reception frequency spectrum matching detection, transmission-reception code rate, modulation and demodulation mode, coding and decoding mode, scrambling and descrambling mode, code pattern matching and satellite-ground joint error rate detection.
The detection of the matching of the frequency spectrum of the transmitting and receiving comprises the following steps:
2a, connecting the satellite and the radio frequency cables, and calibrating power levels at outlets of the two radio frequency cables respectively through a frequency spectrograph to ensure that the power levels are within a safety limit value which cannot cause system saturation;
2b, simultaneously transmitting carrier signals by two channels of the satellite;
respectively detecting the levels of the two channels of the satellite at the outlet of the radio frequency cable by adjusting the attenuators of the two channels of the satellite, so that the output levels of the two channels are kept consistent as much as possible, and the difference of the output levels of the two channels is 0.5 dB;
2d, using a frequency spectrograph to respectively detect the frequency of the transmitted carrier signals of the two channels of the satellite, and comparing the frequency with the set frequency of the satellite, wherein the error is 10-5 orders of magnitude;
2e, simultaneously transmitting modulation signals by two channels of the satellite;
2f, respectively detecting the frequency spectrums of the transmitting modulation signals of the two channels of the satellite by using a frequency spectrograph, wherein the central frequency of the frequency spectrograph is set as the satellite data transmission frequency, the bandwidth of the frequency spectrograph is set to be 450MHz and 900MHz, RBW is set to be 3MHz, and VBW is set to be 3 KHz;
2g, closing the satellite transmitter, disconnecting the frequency spectrograph from the radio frequency cable, and respectively connecting the radio frequency cable to the input of a coupler of the ground digital transmission satellite-ground docking system;
2h, restarting the satellite, transmitting a carrier signal, measuring the frequency of the received carrier signal after the satellite signal is converted to the intermediate frequency by the frequency spectrograph, and comparing the frequency with the set frequency of the satellite, wherein the error is in the magnitude of 10-5;
2i, a satellite transmits a modulation signal, a frequency spectrograph measures a received modulation signal frequency spectrum of the satellite signal after the frequency of the satellite signal is converted to an intermediate frequency, and the frequency spectrograph is arranged as above;
in a preferred embodiment, the satellite transmits a carrier signal, and the carrier signal frequency is detected at a transmitting end and a ground receiving intermediate frequency end respectively; the satellite sends a modulation signal, the frequency spectrum of the modulation signal is detected at the transmitting end and the ground receiving intermediate frequency end respectively, and the transmitting → receiving frequency and the frequency spectrum are matched, so that the frequency spectrum packet is smooth and has no distortion.
The detection of the interface matching such as the transmitting-receiving modulation and demodulation mode, the coding and decoding mode, the scrambling and descrambling mode, the code pattern matching and the like comprises the following steps:
2a, satellite transmitting a modulation signal;
receiving and demodulating satellite signals by a demodulator of the ground data transmission satellite-ground docking system, observing that carrier, code element and frame synchronization of the demodulator are all locked, and comparing code rate, a modulation and demodulation mode, a coding and decoding mode, a scrambling and descrambling mode, a code pattern and the like from an interface and matching;
in a preferred embodiment, according to the satellite-ground interface, the two channels of the demodulator are set to have the code rate of 450Mbps, OQPSK demodulation, LDPC 7/8 decoding and descrambling which conform to the CCSDS standard, the code type is NRZ-L code, the frame length is 1024 bytes, and the frame header is 1ACFFC 1D. The modulator-demodulator for satellite transmitted modulated signal can correctly process the signals, and the carrier, code element and frame synchronization are all locked, so that the interface matching and consistency of the transmitting → receiving modulation-demodulation mode, the coding and decoding mode, the scrambling and descrambling mode, the code pattern matching and the like can be judged.
The satellite-ground combined error rate detection comprises the following steps:
a. after the detection is finished, the equipment demodulator is in a corresponding matching state;
b. the satellite transmitter is closed, the integral bandwidth BW of a frequency spectrograph is set to be 450MHz according to the characteristics of a satellite transmitting signal, the noise power N of two channels received on the ground is respectively detected, and the numerical value of N is recorded;
c. two channels of the satellite simultaneously transmit modulation signals, a ground data transmission satellite-ground docking system carries out a series of processing such as frequency conversion and demodulation, and a data recording device records satellite data in real time and detects and counts data error rate in real time;
d. according to the error rate statistical result, adjusting the satellite adjustable step attenuator to enable the error rate to be in the magnitude of 1E-7;
e. recording the statistical result of the error rate, measuring the intermediate frequency signal power S + N of the ground data transmission satellite-ground docking system by using a frequency spectrograph, calculating to obtain S/N, and further obtaining C/N0；
The formula for obtaining S/N by S + N is as follows: S/N10 log10(10((S+N)-N)/10)-1)；
Said obtaining C/N0The formula of (1) is: C/N0＝S/N+10*log10(BW)；
Wherein, BW is the integral bandwidth of the spectrometer, and 450MHz is taken.
Step-adjusting the adjustable attenuation value of the satellite by 1dB until the statistical real-time error rate is 0, and repeating the step e;
bit error rate results
And step 3: star-to-ground antenna alignment
And 3a, placing a satellite in a proper place with an electromagnetic environment meeting the butt joint requirement, wherein the place meets the far field distance of the ground receiving antenna, and no large shielding object is arranged around the place.
And 3b, checking the electromagnetic leakage condition of the satellite, and taking effective shielding measures to ensure that the interference to the ground data transmission satellite-ground butt joint system is avoided.
3c, the satellite selects to transmit a right-handed modulation signal and adjusts the ground receiving antenna to point to the satellite;
3d, starting an automatic tracking mode by the ground receiving antenna, and implementing initial alignment of the satellite-ground antenna;
3e, respectively adjusting the directions of the satellite antennas in the horizontal direction and the vertical direction, and detecting the power of the channel signal received on the ground by the ground frequency spectrograph until the power of the received signal is maximum;
and 3f, verifying whether the satellite-ground antenna is aligned or not through the symmetry of the antenna directional diagram.
The antenna directional diagram symmetry verification satellite-ground antenna alignment method comprises the following specific implementation steps: adjusting the direction of the satellite antenna, and when the frequency spectrograph reads the maximum signal power P, defaulting the position to be in an initial alignment state; the angle of 3dB beam width of a satellite antenna is deviated to the left/up at the position, and the reading value P1 of the level at the moment is recorded; then, based on the initial alignment position, the angle of 3dB beam width of a satellite antenna is deviated to the right/down direction, and the level reading value P2 at the moment is recorded; comparing the P1 and P2 values to determine whether the P-3dB is satisfied; when the condition is met, the satellite-ground antenna is considered to be aligned, otherwise, the steps are continuously carried out, and finally the satellite-ground antenna alignment position is determined.
In a preferred embodiment, the satellite is placed on the top of a mountain, the satellite-ground antenna is about 3.5 kilometers away, and the ground receiving antenna is at an elevation angle of about 6.3 °.
Table 1 shows the positioning angles of the satellite data transmission antenna and the ground receiving antenna after the positions of the satellite and the ground receiving antenna are adjusted repeatedly. The X axis is the horizontal direction of the satellite data transmission antenna, and the Y axis is the vertical direction of the satellite data transmission antenna; the AZ axis is the azimuth direction of the ground receiving antenna, and the EL axis is the elevation direction of the point receiving antenna.
TABLE 1 positioning angle of satellite data transmission antenna and ground receiving antenna
And 4, step 4: power level scaling
4a, on the basis of aligning the satellite-ground antenna, closing the satellite transmitter, calibrating the noise power N of a right-handed channel of the ground data transmission satellite-ground butt joint system by using a frequency spectrograph, and setting the integral bandwidth of the frequency spectrograph to be 450 MHz;
4b, starting the satellite, adjusting the satellite attenuator to a proper transmitting power, and reading the signal power S + N calibrated by the frequency spectrograph;
4C, calibrating according to the calculation formula to obtain C/N0Comparing with theoretical calculation; according to the calibrated C/N0And theoretical calculation of C/N0Again confirming that the star-earth antenna is aligned.
Theoretical and calibrated values
Table 2 shows the calibrated carrier ratio C/N in the preferred embodiment0And theoretical carrier-to-noise ratio C/N0The difference between the S and the N is less than 1dB, and the S/N calibration test data can be considered to be effective and the satellite-ground antenna is in an alignment state by considering the pointing loss, the atmospheric loss, the polarization loss, the gain error of the satellite data transmission antenna, the G/T value error of the actual ground receiving system, the measurement error of the frequency spectrograph and other factors.
TABLE 2
| Satellite antenna input (dBm) | -18.1 |
| Satellite data transmission antenna gain (dBi) | 29 |
| Space attenuation (dB) | -121.61 |
| Ground receiving G/T (dB/K) | 33.5 |
| Theoretical calculation of C/N0(dBHz) | 121.39 |
| Measured ground reception C/N0 | 120.4 |
And 5: and the wireless state detects the satellite-ground interface and the performance.
The wireless state docking includes, but is not limited to, interface matching detection such as transmission-reception frequency spectrum matching detection, transmission-reception code rate, modulation and demodulation mode, coding and decoding mode, scrambling and descrambling mode, code pattern matching, satellite-to-ground synthesis XPD and error rate detection.
The detection of the matching of the frequency spectrum of the transmitting and receiving frequency comprises the following steps:
5a, disconnecting the antenna from the satellite;
5b, the satellite simultaneously transmits left-right rotation modulation signals, the satellite adjustable step attenuator is adjusted, and the difference of the power levels of the two channels is 0.5 dB;
5c, simultaneously transmitting single carrier signals by the left-handed channel and the right-handed channel of the satellite;
5d, using a frequency spectrograph to respectively detect the frequency of the transmitting carrier signals of the two channels of the satellite;
5e, simultaneously transmitting modulation signals by the left-right rotation channel of the satellite;
5f, respectively detecting the spectrums of the two satellite channel transmission modulation signals by using a frequency spectrograph;
5g, shutting down the satellite transmitter, connecting the satellite antenna, placing the satellite antenna in an alignment state position, and adjusting the value of a satellite attenuator to ensure that the transmitted signal power cannot damage the ground data transmission butt joint system equipment;
5h, restarting the satellite, transmitting a single carrier signal, and measuring the frequency of a received carrier signal after the satellite signal is converted to the intermediate frequency by the frequency spectrograph;
and 5i, transmitting a modulation signal by a satellite, and measuring a received modulation signal frequency spectrum of the satellite signal after the satellite signal is subjected to frequency conversion to an intermediate frequency by a frequency spectrograph.
In a preferred embodiment, the satellite transmits a carrier signal, and the carrier signal frequency is detected at a transmitting end and a ground receiving intermediate frequency end respectively; the satellite sends a modulation signal, the frequency spectrums of the modulation signal are detected at a transmitting end and a ground receiving intermediate frequency end respectively, the frequency spectrum packet is smooth, the wireless state has no obvious frequency spectrum distortion compared with the wired state, and the transmitting → receiving frequency and the frequency spectrum are matched.
The detection of the interface matching performance such as the transmitting-receiving code rate, the modulation and demodulation mode, the coding and decoding mode, the scrambling and descrambling mode, the code pattern matching performance and the like comprises the following steps:
a. the satellite transmits a modulation signal;
b. a demodulator of the ground data transmission satellite-ground docking system receives and demodulates satellite signals, the carrier, code element and frame synchronization of the demodulator is observed to be locked, and the code rate, the modulation and demodulation mode, the coding and decoding mode, the scrambling and descrambling mode, the code pattern and the like are matched from an interface;
in a preferred embodiment, the satellite-ground interface is checked again in the wireless state, and the interface matching and consistency of the transmission → reception modulation and demodulation mode, the coding and decoding mode, the scrambling and descrambling mode, the code pattern matching and the like can be judged.
The satellite-to-ground synthesis XPD and the bit error rate detection comprise satellite-to-ground synthesis XPD and bit error rate detection in an aligned state and satellite-to-ground synthesis XPD and bit error rate detection in a non-aligned state.
The satellite-to-ground synthesis XPD and bit error rate detection in the alignment state comprises the following steps:
a. keeping the satellite-ground antenna aligned, and after the detection is finished, setting the equipment demodulator in a corresponding matching state;
b. the satellite transmitter is closed, the integral bandwidth BW of a frequency spectrograph is set to be 450MHz according to the characteristics of a satellite transmitting signal, the noise power N of a ground receiving left-right rotation channel is respectively detected, and the numerical values of N are respectively recorded;
c. the satellite closes the right-handed channel signal and independently transmits a left-handed modulation signal;
d. frequency spectrograph for respectively detecting ground numberThe signal power S + N of the intermediate frequency left-right rotation channel (two channels) of the satellite-ground butt joint system is calculated to obtain the S/N of the left-right rotation channel11And S/N12(ii) a The left-handed channel corresponds to the first channel, the right-handed channel corresponds to the second channel, wherein S/N11The signal-to-noise ratio of the first ground receiving channel is S/N when the first channel signal is independently transmitted12When the signal of the first channel is independently transmitted, the signal-to-noise ratio of the second channel is received on the ground;
e. the satellite turns off the left-handed signal and independently transmits a right-handed modulation signal;
f. repeating the step c to obtain the S/N of the two channels21And S/N22(ii) a Wherein S/N21The signal-to-noise ratio of the first ground receiving channel, S/N, is the same as that of the second channel when the signals of the first ground receiving channel are independently transmitted22When the signal of the channel II is independently transmitted, the signal to noise ratio of the channel II is received on the ground;
g. obtaining the star-ground synthesis XPD according to the step c and the step e, wherein the formula for obtaining the left-handed channel star-ground synthesis XPD is as follows: XPD1＝S/N11-S/N21；
The formula for obtaining the dextro-star synthetic XPD is as follows: XPD2＝S/N22-S/N12；
Wherein, S/N11When the channel I signal is independently transmitted, the signal-to-noise ratio of the channel I is received on the ground; S/N21When the signal of the channel I is independently transmitted, the signal to noise ratio of the channel I is received on the ground; S/N22When the signal of the channel II is independently transmitted, the signal to noise ratio of the channel II is received on the ground; S/N12When the signal of the first channel is independently transmitted, the signal-to-noise ratio of the second channel is received on the ground;
h. under the condition of keeping the alignment of the satellite-ground antenna, the satellite simultaneously transmits two-channel modulation signals;
i. according to the error rate statistical result, adjusting the satellite adjustable step attenuator to enable the error rate to be in the magnitude of 1E-7;
j. recording the statistical result of the error rate, measuring the intermediate frequency signal power S + N of the ground data transmission satellite-ground docking system by using a frequency spectrograph, calculating to obtain S/N, and further obtaining C/N0；
Said S + N isThe formula to S/N is: S/N10 log10(10((S+N)-N)/10)-1)；
Said obtaining C/N0The formula of (1) is: C/N0＝S/N+10*log10(BW)；
Wherein BW is the integral bandwidth of the spectrometer.
k. Adjusting the adjustable attenuation value of the satellite with the stepping precision of 1dB until the statistical real-time error rate is 0, and repeating the step j;
satellite-to-ground synthesis XPD and bit error rate detection in a non-aligned state:
a. changing the relative position relationship between the satellite and the ground antenna, deviating the horizontal direction of the satellite antenna by +/-0.5 degrees, +/-2.0 degrees and +/-2.5 degrees, and repeating the steps b-j of detecting and synthesizing XPD and error code rate under the alignment state;
b. changing the relative position relationship between the satellite and the ground antenna, deflecting the vertical direction of the satellite antenna by +/-0.5 degrees and +/-2.0 degrees, and repeating the steps b-j of detecting and synthesizing XPD and error rate in the alignment state;
c. and (3) changing the relative position relationship between the ground antenna and the satellite, deviating the orientation of the ground antenna by +/-0.02 degrees and pitching by +/-0.02 degrees, and repeating the steps b-j of detecting and synthesizing XPD and error rate in the alignment state.
In the preferred embodiment, the C/N required when the left-hand error rate is 1.4E-6 in the alignment state of the satellite-ground antenna091.1dBHz at C/N0The error code rate is 0 when the code rate is 92.14 dBHz; C/N required when right-hand bit error rate is 8.56E-8091.49dBHz at C/N0The error rate is 0 at 92.35 dBHz. In the test state, the satellite-to-ground synthetic XPD is good, and the wireless bit error rate test result is less affected by the XPD.
In the antenna alignment state, the satellite-ground synthesis XPD is good, and the wireless error rate statistical result is less influenced by the XPD. When the satellite antenna is in a bias state, the satellite-ground synthetic XPD worst is deteriorated to 27dB magnitude, and under the influence of the polarization interference, the demodulation error rate is still basically not influenced.
FIG. 3 shows the left-right rotation XPD for satellite-to-ground antenna alignment and satellite antenna offset in the described embodiment: when the X axis (horizontal direction) of the satellite antenna is in an offset state (+ -0.5 degrees, + -2.0 degrees and +/-2.5 degrees), the satellite-ground synthetic XPD left-hand rotation is 27.75 dB-32.12 dB, the right-hand rotation is 27.74 dB-34.68 dB, and the left-hand rotation XPD and the right-hand rotation XPD are reduced relative to the alignment state. When the Y axis (vertical direction) of the satellite antenna is biased to be plus or minus 0.5 degrees and plus or minus 2.0 degrees, the satellite-ground synthetic XPD left-hand rotation is 29.69-32.46 dB, and the right-hand rotation is 31.84 dB-34.85 dB.
FIG. 4 shows the left-right rotation XPD for the alignment of the satellite-ground antenna and the offset of the ground antenna in the embodiment: when the ground antenna is biased, the star-ground synthetic XPD left-hand rotation is 32.44 dB-32.94 dB, the right-hand rotation is 34.25 dB-34.96 dB, the deviation of the left-hand XPD is within 1dB compared with the alignment state, the deviation of the right-hand XPD is within 0.5dB, and no obvious change occurs.
Further, the polarization tilt angle relationship between the satellite-ground antennas directly affects the XPD measurement data results. In this embodiment, the test data only corresponds to the polarization tilt angle relationship of the satellite-ground antenna in one state. The XPD synthesized by the left-handed and right-handed channels of the test data is inconsistent, and also accords with the relationship between the satellite-ground antenna and the polarization inclination angle, because the left-handed and right-handed rotation axis ratios of the satellite-ground antenna are not completely consistent. In conclusion, the XPD data tested by the method is real, reasonable and effective.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for implementing data transmission satellite-ground docking between a ground receiving station and a satellite is characterized by comprising the following steps:
step 1: self-checking the state of the ground data transmission satellite-ground docking system;
step 2: detecting a satellite-ground interface and performance in a wired state;
and step 3: aligning the satellite-ground antenna;
and 4, step 4: scaling the power level;
and 5: and the wireless state detects the satellite-ground interface and the performance.
2. The method for implementing data transmission satellite-ground docking of a ground receiving station and a satellite according to claim 1, wherein the step 1: ground data transmission satellite-ground butt joint system state self-checking specifically includes:
1a, checking the state of the ground data transmission satellite-ground docking system equipment to ensure that the ground data transmission satellite-ground docking system equipment works normally;
1b, checking the states of the intermediate frequency link and the radio frequency link to ensure that the link state of the ground data transmission satellite-ground docking system is normal;
1c, checking the state of the ground data transmission satellite-ground docking system to ensure that the G/T value, the servo control and the error code performance of the ground data transmission satellite-ground docking system are normal;
and 1d, checking power supply and grounding environment parameters to ensure that the butt joint environment of the ground receiving station and the satellite is normal.
3. The method for implementing data transmission satellite-ground docking of a ground receiving station and a satellite according to claim 1, wherein the step 2: detecting a satellite-ground interface and performance in a wired state, wherein the wired state comprises interface matching detection and satellite-ground combined bit error rate detection, namely: detecting the matching of the frequency spectrum of the transmitting-receiving frequency, and detecting the rate of the transmitting-receiving code, a modulation and demodulation mode, a coding and decoding mode, a scrambling and descrambling mode and the matching of a code pattern;
the method for detecting the frequency spectrum matching of the transmitting-receiving frequency comprises the following steps:
2a, connecting the satellite and the radio frequency cable, and calibrating the power level at the outlet of the radio frequency cable through a frequency spectrograph to ensure that the power level is within a safety limit value which does not cause the saturation of the ground data transmission satellite-ground docking system;
2b, simultaneously transmitting carrier signals by two channels of the satellite;
respectively detecting the levels of the two channels of the satellite at the outlet of the radio frequency cable by adjusting the attenuators of the two channels of the satellite, so that the output levels of the two channels are kept consistent, and the difference of the output levels of the two channels is not more than 1 dB;
2d, using a frequency spectrograph to respectively detect the frequency of the transmitting carrier signals of the two channels of the satellite;
2e, simultaneously transmitting modulation signals by two channels of the satellite;
2f, respectively detecting the spectrums of the two channels of the satellite transmission modulation signals by using a frequency spectrograph;
2g, closing the satellite transmitter, disconnecting the frequency spectrograph from the radio frequency cable, and connecting the outlet of the radio frequency cable to the input of a coupler of the ground digital transmission satellite-ground docking system;
2h, restarting the satellite, transmitting a carrier signal, and measuring the frequency of the received carrier signal after the satellite signal is converted to the intermediate frequency by the frequency spectrograph;
and 2i, transmitting a modulation signal by a satellite, and measuring a received modulation signal frequency spectrum after the satellite signal is subjected to frequency conversion to an intermediate frequency by a frequency spectrograph.
4. The method as claimed in claim 3, wherein the step 2 of detecting the matching between the interface comprises the steps of:
2a, satellite transmitting a modulation signal;
and 2b, receiving and demodulating satellite signals by a demodulator of the ground data transmission satellite-ground docking system, observing that carrier, code element and frame synchronization of the demodulator are all locked, and comparing code rate, a modulation and demodulation mode, a coding and decoding mode, a scrambling and descrambling mode and a code pattern from an interface and matching.
5. The method of claim 3, wherein the joint bit error rate detection comprises:
3a, after the interface matching detection is finished, the equipment demodulator is in a corresponding matching state;
3b, the satellite transmitter is closed, the integral bandwidth BW of the frequency spectrograph is set according to the characteristics of the satellite transmitting signals, the noise power N of two channels received on the ground is respectively detected, and the numerical value of N is recorded;
3c, simultaneously transmitting modulation signals by two channels of the satellite, implementing frequency conversion and demodulation by a ground data transmission satellite-ground butt joint system, recording satellite data by data recording equipment in real time, and detecting and counting the data error rate in real time;
3d, adjusting the satellite adjustable step attenuator according to the error rate statistical result to enable the error rate to be within a specified magnitude;
3e, recording the statistical result of the error rate, measuring the intermediate frequency signal power S + N of the ground data transmission satellite-ground butt joint system by using a frequency spectrograph, wherein S is the effective signal power, N is the noise power, calculating to obtain S/N, and further obtaining C/N0，C/N0Is the carrier-to-noise ratio, N0Is the noise power spectral density;
the formula for obtaining S/N by S + N is as follows: S/N10 log10((10((S+N)-N)/10)-1)；
Said obtaining C/N0The formula of (1) is: C/N0＝S/N+10*log10(BW)；
Wherein, BW is the integral bandwidth of the frequency spectrograph;
and 3f, adjusting the attenuation value by using the step precision of the adjustable step attenuator until the statistical real-time error rate is 0, and repeating the step e.
6. The method for implementing data-transmission satellite-ground docking of a ground receiving station and a satellite according to claim 1, wherein the step 3: aligning the satellite-ground antenna specifically includes:
3a, placing a satellite in a field meeting the butt joint requirement in an electromagnetic environment, wherein the position of the field meets the far-field distance of a ground receiving antenna, and no large shielding object is arranged around the field;
3b, checking the electromagnetic leakage condition of the satellite, and adopting effective shielding measures to ensure that the interference on a ground data transmission satellite-ground butt joint system is avoided;
3c, the satellite selects to transmit any path of modulation signal and adjusts the ground receiving antenna to point to the satellite;
3d, starting an automatic tracking mode by the ground receiving antenna, and implementing initial alignment of the satellite-ground antenna;
3e, respectively adjusting the directions of the satellite antennas in the horizontal direction and the vertical direction, and detecting the power of the channel signal received on the ground by the ground frequency spectrograph until the power of the received signal is maximum;
and 3f, verifying whether the satellite-ground antenna is aligned or not through the symmetry of the antenna directional diagram.
7. The method of claim 6, wherein the antenna pattern symmetry verifies the alignment of the satellite-to-ground antenna, comprising the steps of:
adjusting the direction of the satellite antenna, and when the frequency spectrograph reads the maximum signal power P, defaulting the position to be in an initial alignment state; the angle of 3dB beam width of a satellite antenna is deviated to the left/up at the position, and the reading value P1 of the level at the moment is recorded; then, based on the initial alignment position, the angle of 3dB beam width of a satellite antenna is deviated to the right/down direction, and the level reading value P2 at the moment is recorded; comparing the P1 and P2 values to determine whether the P-3dB is satisfied; when the condition is met, the satellite-ground antenna is considered to be aligned, otherwise, the steps are continuously carried out, and finally the satellite-ground antenna alignment position is determined.
8. The method for implementing data-transmission satellite-ground docking of a ground receiving station and a satellite according to claim 7, wherein the step 4: scaling the power level, specifically comprising:
4a, on the basis of aligning the satellite-ground antenna, closing the satellite transmitter and reading the noise power N calibrated by the frequency spectrograph;
4b, starting the satellite, adjusting the satellite attenuator to a preset transmitting power, and reading the signal power S + N calibrated by the frequency spectrograph, wherein S is the effective signal power, and N is the noise power;
4C, calibrating according to a calculation formula to obtain C/N0Comparing with theoretical calculation; according to the calibrated C/N0And theoretical calculation of C/N0Again confirming that the satellite-ground antenna is aligned, C/N0Is the carrier to noise ratio, N0Is the noise power spectral density.
9. The method for implementing data transmission satellite-ground docking of a ground receiving station and a satellite according to claim 1, wherein the step 5: wireless state detects satellite-ground interface and performance, and wireless state butt joint detects including interface matching nature, and star-ground synthesis XPD and bit error rate detect specifically include:
detecting the matching of the frequency spectrum of the transmitting-receiving frequency, and detecting the rate of the transmitting-receiving code, a modulation and demodulation mode, a coding and decoding mode, a scrambling and descrambling mode and the matching of a code pattern; wherein,
the transmit-receive frequency spectrum match detection comprises:
5a, disconnecting the antenna from the satellite;
5b, the satellite simultaneously transmits left-right rotation modulation signals, and the satellite adjustable step attenuator is adjusted to ensure that the power level difference of the two channels is less than 1 dB;
5c, simultaneously transmitting single carrier signals by two channels of the satellite;
5d, respectively detecting the frequency of the two channel transmission carrier signals of the satellite by using a frequency spectrograph;
5e, simultaneously transmitting modulation signals by two channels of the satellite;
5f, respectively detecting two channel transmission modulation signal spectrums of the satellite by using a frequency spectrograph;
5g, shutting down the satellite transmitter, connecting the satellite antenna, placing the satellite antenna in an alignment state position, and adjusting the value of a satellite attenuator to ensure that the transmitted signal power cannot damage the ground data transmission butt joint system equipment;
5h, restarting the satellite, transmitting a single carrier signal, and measuring the frequency of a received carrier signal after the satellite signal is converted to the intermediate frequency by the frequency spectrograph;
5i, transmitting a modulation signal by a satellite, and measuring a received modulation signal frequency spectrum of the satellite signal after the satellite signal is subjected to frequency conversion to an intermediate frequency by a frequency spectrograph;
the transmission-reception code rate, the modulation and demodulation mode, the coding and decoding mode, the scrambling and descrambling mode and the code pattern matching detection comprise the following steps:
a. the satellite transmits a modulation signal;
b. the demodulator of the ground data transmission satellite-ground docking system receives and demodulates satellite signals, the carrier, code element and frame synchronization of the demodulator is observed to be locked, and the code rate, the modulation and demodulation mode, the coding and decoding mode, the scrambling and descrambling mode and the code pattern are matched from an interface.
10. The method of claim 9, wherein the satellite-to-ground synthesis XPD and ber detection comprises a satellite-to-ground synthesis XPD and ber detection in an aligned state and a satellite-to-ground synthesis XPD and ber detection in a non-aligned state;
the satellite-to-ground synthesis XPD and bit error rate detection in the alignment state comprises the following steps:
a. keeping the satellite-ground antenna aligned, and after the detection is finished, setting the equipment demodulator in a corresponding matching state;
b. the satellite transmitter is closed, the integral bandwidth BW of a frequency spectrograph is set according to the characteristics of a satellite transmitting signal, the noise power N of two channels received on the ground is respectively detected, and the numerical value of N is recorded;
c. the satellite closes the second channel and independently transmits the modulation signal of the first channel;
d. the frequency spectrograph respectively detects the signal power S + N of two intermediate frequency channels of the ground data transmission satellite-ground butt joint system, calculates S/N, and obtains the two channels S/N11And S/N12(ii) a Wherein S/N11The signal-to-noise ratio of the first ground receiving channel is S/N when the first channel signal is independently transmitted12When the signal of the first channel is independently transmitted, the signal-to-noise ratio of the second channel is received on the ground;
e. the satellite closes the first channel signal and independently transmits a second channel modulation signal;
f. repeating the step c to obtain the S/N of the two channels21And S/N22(ii) a Wherein S/N21The signal-to-noise ratio of the first ground receiving channel, S/N, is the same as that of the second channel when the signals of the first ground receiving channel are independently transmitted22When the signal of the channel II is independently transmitted, the signal to noise ratio of the channel II is received on the ground;
g. and e, obtaining the satellite-to-ground synthetic XPD according to the step c and the step e, wherein the formula for obtaining the channel-to-satellite synthetic XPD is as follows: XPD1＝S/N11-S/N21(ii) a The formula for obtaining the channel two-satellite synthesis XPD is as follows: XPD2＝S/N22-S/N12；
Wherein, S/N11When the channel I signal is independently transmitted, the signal-to-noise ratio of the channel I is received on the ground; S/N21When the signal of the channel I is independently transmitted, the signal to noise ratio of the channel I is received on the ground; S/N22When the signal of the channel II is independently transmitted, the signal to noise ratio of the channel II is received on the ground; S/N12When the signal of the first channel is independently transmitted, the signal-to-noise ratio of the second channel is received on the ground;
h. under the condition of keeping the alignment of the satellite-ground antenna, the satellite simultaneously transmits two-channel modulation signals;
i. according to the error rate statistical result, adjusting the satellite adjustable step attenuator to enable the error rate to be within a specified magnitude;
j. recording the statistical result of the error rate, measuring the intermediate frequency signal power S + N of the ground data transmission satellite-ground docking system by using a frequency spectrograph, calculating to obtain S/N, and further obtaining C/N0(ii) a Wherein S is the effective signal power, N is the noise power, C/N0Is the carrier to noise ratio, N0Is the noise power spectral density;
the formula for obtaining S/N by S + N is as follows: S/N10 log10((10((S+N)-N)/10)-1)；
Said obtaining C/N0The formula of (1) is: C/N0＝S/N+10*log10(BW)；
Wherein, BW is the integral bandwidth of the frequency spectrograph;
k. adjusting the attenuation value according to the step precision of the adjustable step attenuator until the statistical real-time error rate is 0, and repeating the step j;
the satellite-to-ground synthesis XPD and bit error rate detection in the unaligned state comprises the following steps:
a. changing the relative position relationship between the satellite and the ground antenna, deviating the horizontal or vertical direction of the satellite antenna to a preset angle, and repeating the steps b-j of detecting and synthesizing XPD and error code rate in the alignment state;
b. and (c) changing the relative position relationship between the ground antenna and the satellite, deviating the azimuth or the pitching direction of the ground antenna to a preset angle, and repeating the steps b-j of detecting and synthesizing XPD and error rate in the alignment state.
11. A system for implementing a data-centric docking between a ground receiving station and a satellite, comprising:
the system comprises a ground receiving antenna, channel equipment, a ground demodulator, a data recorder, a radio frequency cable, a frequency spectrograph, an uplink test link and guarantee equipment;
the ground receiving antenna is connected to the channel equipment and the uplink test link; the ground receiving antenna is used for tracking and receiving radio frequency signals transmitted by a satellite, has orthogonal polarization multiplexing receiving capacity, can capture and receive polarization multiplexing signals transmitted by the satellite, and controls the antenna to point to the satellite when data transmission satellite-ground docking is implemented;
the channel equipment is respectively connected with a ground demodulator and a spectrometer; the channel equipment is used for converting the radio frequency signals received by the antenna into intermediate frequency signals and transmitting the intermediate frequency signals to the ground demodulator for further processing;
the ground demodulator is further connected to the data recorder, and the ground demodulator is used for demodulating and processing signals sent by the satellite at the intermediate frequency end, verifying the key satellite-ground interface parameters: modulating a coding mode, a scrambling mode and a code rate code pattern;
and the data recorder is used for recording, disking and storing the original data obtained by the processing of the ground demodulator to complete the error rate statistics of the PN code or the fixed frame data.
12. The system of claim 11, wherein the rf cable is used to connect satellite related equipment to the ground receiving antenna coupling port;
the uplink test link is used for self-checking the state of the ground data transmission satellite-ground docking system;
the guarantee equipment is used for guaranteeing and assisting equipment when the ground receiving station is in data transmission satellite-ground butt joint with a satellite, and improves the safety and operability of the equipment.
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| CN116318342B (en) * | 2023-02-28 | 2024-03-19 | 北京扬铭科技发展有限责任公司 | Low-orbit satellite signal monitoring method and equipment |
| CN116743241A (en) * | 2023-08-16 | 2023-09-12 | 天津讯联科技有限公司 | Inter-satellite link system implementation method suitable for satellite-surrounding flying formation |
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