CN117478209A - High availability laser microwave hybrid transmission satellite communication system - Google Patents
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Abstract
The invention provides a high-availability laser microwave hybrid transmission satellite communication system, and relates to the technical field of satellite communication. The satellite-borne laser microwave hybrid terminal and the ground laser microwave hybrid terminal adopt microwaves and lasers to simultaneously establish link transmission with a ground station, adopt a satellite-ground system laser microwave channel estimation and link control mode to realize laser microwave hybrid cooperative transmission, and improve the availability of a satellite-ground high-speed link in a microwave link retransmission mode. The invention can effectively ensure the reliable transmission of satellite-ground communication data, and is particularly suitable for a high-speed data transmission system for high-low orbit satellite communication.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a high-availability laser microwave hybrid transmission satellite communication system.
Background
Satellite communication has the advantages of wide communication range, long transmission distance, high communication capacity, strong anti-interference capability and the like, and becomes an indispensable means in satellite-to-ground communication. In the aspect of the microwave high-speed satellite-ground high-speed communication technology, through the technology accumulation of the last twenty years, rich research results are obtained, and the single carrier highest transmission rate reaches 2-3Gbps. A plurality of key technologies are broken through in the field of laser satellite-to-ground communication, and inter-satellite laser communication verification is performed; but the laser communication link test verification of the satellite and the ground is not successfully carried out in China.
The laser communication has the advantages of large bandwidth, low power consumption, good confidentiality and the like, and is a necessary technology for the transmission of the high-speed satellite-ground link in the future. However, satellite-ground link laser communication is susceptible to severe weather conditions such as cloud, fog, haze, rain, snow and the like and atmospheric turbulence under the current technical conditions, so that burst error codes and even communication interruption are caused. Compared with laser communication, the microwave communication transmission rate is lower, but the communication capability is stronger in severe weather. Therefore, the satellite-ground link transmission adopts a laser microwave cooperative transmission mode, and the satellite-ground link transmission is adopted when the weather condition is good, and the satellite-ground link transmission is switched to the microwave link when the weather condition is bad. In the laser microwave switching process, minimizing data errors or losses is an urgent problem and difficulty to be solved.
Disclosure of Invention
In view of the above, the invention provides a high availability laser microwave hybrid transmission satellite communication system, which adopts a mode of combining satellite data deep buffer, laser microwave channel estimation, link control and system selection, and can realize laser microwave cooperative work when a satellite-to-ground laser link is interrupted or unavailable due to weather factors, thereby ensuring reliable transmission of satellite-to-ground communication data.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the satellite communication system comprises a satellite-borne laser microwave mixed load and a ground laser microwave mixed terminal, wherein the satellite-borne laser microwave mixed load comprises a satellite-borne laser emission system, a satellite-borne microwave emission system, a satellite-borne laser receiving system and a satellite-borne microwave receiving system, and the ground laser microwave mixed terminal comprises a ground laser emission system, a ground microwave emission system, a ground laser receiving system and a ground microwave receiving system; the satellite-borne laser microwave hybrid load further comprises an uplink channel estimation unit and a satellite-borne link control and system selection unit, and the ground laser microwave hybrid terminal further comprises a downlink channel estimation unit and a ground link control and system selection unit; the satellite-borne link control and system selection unit comprises a satellite-borne framing processor, a satellite-borne buffer memory, a satellite-borne channel discrimination controller and a satellite-borne data identifier; the ground link control and system selection unit comprises a ground framing processor, a ground buffer memory, a ground channel discrimination controller and a ground data identifier; the satellite-borne microwave transmitting system and the ground microwave receiving system form a microwave downlink, the ground microwave transmitting system and the satellite-borne microwave receiving system form a microwave uplink, and the microwave uplink and the microwave downlink form a microwave communication link; the satellite-borne laser transmitting system and the ground laser receiving system form a laser downlink, the ground laser transmitting system and the satellite-borne laser receiving system form a laser uplink, and the laser uplink and the laser downlink form a laser communication link;
before satellite-ground communication, carrying out uplink and downlink channel estimation; when estimating a laser uplink channel, a ground laser transmitting system transmits a pseudo-random code laser signal to a satellite-borne laser microwave mixed load, the satellite-borne laser microwave mixed load receives the laser signal through a satellite-borne laser receiving system and outputs the laser signal to an uplink channel estimating unit, the uplink channel estimating unit counts the error rate and the error frame number, and the error rate and the error frame number are compared with a threshold value, and a comparison result is transmitted to a satellite-borne link control and system selection unit; meanwhile, the satellite-borne microwave transmitting system multiplexes the laser uplink transmission control information and the satellite-borne downlink microwave data and transmits the multiplexed laser uplink transmission control information and the satellite-borne downlink microwave data to the ground link control and system selection unit through the microwave downlink; when estimating a laser downlink channel, a satellite-borne laser transmitting system transmits a pseudo-random code laser signal to the ground, a ground laser microwave hybrid terminal receives the laser signal through a ground laser receiving system and outputs the laser signal to a downlink channel estimating unit, the downlink channel estimating unit calculates an error rate and compares the error rate with a threshold value, a comparison result is sent to a ground link control and system selection unit, and meanwhile, the ground microwave transmitting system multiplexes laser downlink transmission control information and ground uplink microwave data and transmits the multiplexed laser downlink transmission control information and ground uplink microwave data to the satellite-borne link control and system selection unit through a microwave uplink;
the microwave link channel estimation is completed on the ground, the satellite-borne microwave transmitting system transmits pseudo-random code microwave signals to the ground, the ground laser microwave hybrid terminal receives the microwave signals through the ground microwave receiving system and outputs the microwave signals to the downlink channel estimation unit, the downlink channel estimation unit calculates the error rate and the microwave channel signal-to-noise ratio, the error rate and the microwave channel signal-to-noise ratio are compared with the threshold value, the comparison result is sent to the ground link control and system selection unit, and meanwhile, the ground microwave transmitting system multiplexes the microwave downlink transmission control information with the ground uplink microwave data and then transmits the microwave downlink transmission control information to the satellite-borne link control and system selection unit through the microwave uplink;
when the satellite is in downlink communication, downlink data enter a satellite-borne framing processor of a satellite-borne link control and system selection unit to carry out data framing processing to obtain framed data, the framed data enter a satellite-borne buffer memory to be buffered, when the data of the satellite-borne buffer memory is stored fully, the data frame starts to be output, the data frame firstly enters a satellite-borne channel discrimination controller, whether a laser communication link is interrupted or not is judged according to a comparison result of a downlink channel estimation unit, if the laser link is interrupted, the data frame is sent into a satellite-borne data identifier, service data with high priority is selected to be downloaded through a satellite-borne microwave transmission system, and the service data with low priority is discarded; if the laser communication link is normal, downloading the data frame through the satellite-borne laser transmitting system;
the ground laser and microwave hybrid terminal receives laser data and microwave data through a ground laser receiving system and a ground microwave receiving system, and a ground link control and system selection unit judges the available conditions of a laser communication link and a microwave communication link according to a downlink channel estimation result, and if the current laser communication link is interrupted, the data of the microwave communication link is directly received and output; if the current laser communication link is normal, receiving data of the laser communication link, decoding and correcting errors, if the data is correct, outputting the data to a user, if the data is checked to be wrong, triggering a retransmission instruction, sending the retransmission instruction to a satellite-borne laser microwave mixed load through a ground microwave transmitting system, after the satellite-borne laser microwave mixed load receives the retransmission instruction, transmitting a data frame to be retransmitted to the ground through the satellite-borne microwave transmitting system, and outputting the data to the user after the ground laser microwave mixed terminal receives the retransmitted data frame through a ground microwave receiving system;
when satellite uplink communication is performed, ground uplink data is subjected to data framing processing through a ground framing processor of a ground link control and system selection unit to obtain framed data, the framed data enters a ground buffer memory for buffering, when the data storage of the ground buffer memory is full, the data frame starts to output a data frame, a ground channel discrimination controller is used for judging whether a laser communication link is interrupted or not according to an estimation result of an uplink channel estimation unit, if the laser communication link is interrupted, the data frame is sent into a ground data identifier, service data with high priority is selected to be transmitted through a ground microwave transmission system, and service data with low priority is discarded; if the laser communication link is normal, transmitting the data frame through a ground laser transmitting system;
the satellite-borne laser microwave mixed load receives laser signals and microwave signals emitted by the ground through a satellite-borne laser receiving system and a satellite-borne microwave receiving system, a satellite-borne link control and system selection unit judges the condition of a laser communication link according to the estimation result of an uplink channel estimation unit, if the current laser communication link is interrupted, the data of the microwave communication link is directly received, decoding and demodulation are completed, and then the data are output to a user; and if the current laser communication link is normal, receiving the data of the laser communication link, decoding and correcting errors, if the data is correct, outputting the data to a user, if the data is checked to be wrong, triggering a retransmission instruction, sending the retransmission instruction to the ground through a satellite-borne microwave transmitting system, and after receiving the retransmission instruction, transmitting a data frame to be retransmitted to a satellite-borne laser microwave mixed load through the ground microwave transmitting system, and sending the received retransmission data frame to the user by the satellite-borne laser microwave mixed load.
Compared with the prior art, the invention has the following advantages:
1. in satellite-to-ground communications, the weather conditions are in line with the laser link transmissions and the laser communications system equipment is normal, the laser communications link is used to communicate at the highest rate. When the weather condition deteriorates and the laser communication link deteriorates to the switching threshold, the microwave communication link is started, and microwave transmission is utilized. After the weather condition is improved, the laser link transmission is re-enabled. The satellite-to-ground system estimates and detects the satellite-to-ground transmission channel through the satellite-borne channel estimation and link control and system selection unit and the ground channel estimation and link control and system selection unit in a cooperative manner, and gives reliable transmission selection and strategy in real time.
2. The satellite-ground laser feed link error code is too high or is interrupted instantaneously due to the factors of atmospheric turbulence, satellite tremble and the like, the receiving end recognizes the current fault frame number and feeds the current fault frame number back to the sending end, the sending end starts a microwave link, and fault data is retransmitted through the microwave link. Therefore, by the scheme of laser transmission and microwave compensation, the high-speed transmission of the satellite-ground link is ensured, and the high reliability of the transmission is also ensured.
3. The invention adopts technical measures of deep storage of satellite-ground system data, retransmission of lost data caused by laser flash, deep interleaving and the like by the microwave link, and can improve the availability of the satellite-ground laser link.
Detailed Description
The present invention will be further described below.
The satellite communication system comprises a satellite-borne laser microwave mixed load and a ground laser microwave mixed terminal, wherein the satellite-borne laser microwave mixed load comprises a satellite-borne laser transmitting system, a satellite-borne microwave transmitting system, a satellite-borne laser receiving system, a satellite-borne microwave receiving system, an uplink channel estimating unit and a satellite-borne link control and system selecting unit, and the ground laser microwave mixed terminal comprises a ground laser transmitting system, a ground microwave transmitting system, a ground laser receiving system, a ground microwave receiving system, a downlink channel estimating unit and a ground link control and system selecting unit.
In the system, a microwave downlink is formed by a satellite-borne microwave transmitting system and a ground microwave receiving system, a microwave uplink is formed by the ground microwave transmitting system and the satellite-borne microwave receiving system, and a microwave communication link is formed by the microwave uplink and the microwave downlink; the satellite-borne laser transmitting system and the ground laser receiving system form a laser downlink, the ground laser transmitting system and the satellite-borne laser receiving system form a laser uplink, and the laser uplink and the laser downlink form a laser communication link.
The following details the components:
and the satellite-borne laser emission system is used for carrying out channel coding and laser modulation to form a modulated laser signal.
And the satellite-borne microwave transmitting system is used for multiplexing the received external baseband signals with satellite-borne link control and system selection unit data, performing channel coding and radio frequency direct modulation after the satellite-borne link control and system selection unit data are completed, forming Ka frequency band signals, performing power amplification, and inputting the Ka frequency band signals to a high-gain microwave antenna for transmission to the ground.
The satellite-borne laser receiving system is used for receiving laser signals, performing self-adaptive compensation on the laser signals, entering the low-noise amplifying module, performing polarization self-difference demodulation, and outputting the demodulated signals after channel decoding.
The satellite-borne microwave receiving system is used for receiving a Ka-band broadband microwave signal from the ground through a high-gain microwave antenna, and performing radio frequency direct demodulation after low-noise amplification; after the demodulated signal completes the channel decoding function, data is output.
The uplink channel estimation unit is used for estimating an uplink laser channel, counting the error rate and the error frame number, comparing the error rate and the error frame number with a threshold value, and transmitting a comparison result to the satellite-borne link control and system selection unit; the laser uplink transmission control information is multiplexed with the satellite-borne downlink microwave data through the satellite-borne microwave transmitting system, and then transmitted to the ground link control and system selection unit through the microwave downlink;
the satellite-borne link control and system selection unit comprises a satellite-borne framing processor, a satellite-borne buffer memory, a satellite-borne channel discrimination controller and a satellite-borne data identifier. The unit judges available satellite-ground links and transmission systems, coding modes, channel gains and the like according to the channel estimation result, and transmits satellite-borne system control information to each function unit of satellite-borne laser and microwave.
The ground laser transmitting system receives the baseband data, performs channel coding and depth interleaving, and then performs polarization quadrature modulation, namely, modulates the same baseband signal onto orthogonal laser carriers of two polarization channels, and transmits the same baseband signal by adopting a multi-wavelength aperture optical antenna after optical amplification.
The ground microwave transmitting system receives the baseband signal from the outside, multiplexes the baseband signal with the data of the ground link control and system selection unit, and performs channel coding after finishing the multiplexing; after the coded data is modulated by an intermediate frequency quadrature bar, the data is subjected to up-conversion and power amplification to form a Ka frequency band radio frequency signal; finally, the antenna transmits the signals to the satellite.
The ground laser receiving system receives the laser downlink signal, and the demodulated data enter the channel decoding unit for de-interleaving and decoding; and outputting the decoded data to the outside of the terminal.
The ground microwave receiving system receives the broadband microwave signal from the Ka frequency band of the satellite through the antenna, and then performs low-noise amplification and down-conversion to form an intermediate frequency signal; feeding the intermediate frequency signal into a baseband processing unit; after the baseband processing unit completes the demodulation and channel decoding functions, data is output, and the parsed link control and system selection data is sent to the ground link control and system selection unit.
The downlink channel estimation unit is used for estimating a downlink laser channel and a microwave channel, counting the error rate and the error frame number, comparing the error rate and the error frame number with a threshold value, and transmitting a comparison result to the satellite-borne link control and system selection unit; and the laser downlink transmission control information, the microwave link transmission control information and the ground uplink microwave data are multiplexed through the satellite-borne microwave transmitting system and then transmitted to the satellite-borne link control and system selection unit through the microwave uplink.
The ground link control and system selection unit comprises a ground framing processor, a ground buffer memory, a ground channel discrimination controller and a ground data identifier. The unit judges available satellite-ground links and transmission systems, coding modes, channel gains and the like according to the channel estimation result, and transmits system control information of the ground to each functional unit of the ground laser and the microwave.
The working principle of the system is as follows:
before satellite-ground communication, carrying out uplink and downlink channel estimation; since the power characteristics of the uplink and downlink channels of the microwave channel are basically the same and the uplink and downlink power characteristics of the laser channel are different, the uplink channel estimation unit comprises an uplink laser channel estimation function, and the downlink channel estimation unit comprises a downlink laser channel estimation function and a microwave channel estimation function.
When estimating a laser uplink channel, a ground laser transmitting system transmits a pseudo-random code laser signal to a satellite-borne laser microwave mixed load, the satellite-borne laser microwave mixed load receives the laser signal through a satellite-borne laser receiving system and outputs the laser signal to an uplink channel estimating unit, the uplink channel estimating unit counts the error rate and the error frame number, and the error rate and the error frame number are compared with a threshold value, and a comparison result is transmitted to a satellite-borne link control and system selection unit; meanwhile, the satellite-borne microwave transmitting system multiplexes the laser uplink transmission control information and the satellite-borne downlink microwave data and transmits the multiplexed laser uplink transmission control information and the satellite-borne downlink microwave data to the ground link control and system selection unit through the microwave downlink; when estimating a laser downlink channel, the satellite-borne laser transmitting system transmits a pseudo-random code laser signal to the ground, the ground laser microwave hybrid terminal receives the laser signal through the ground laser receiving system and outputs the laser signal to the downlink channel estimating unit, the downlink channel estimating unit calculates the error rate and compares the error rate with a threshold value, the comparison result is sent to the ground link control and system selection unit, and meanwhile, the ground microwave transmitting system multiplexes the laser downlink transmission control information with ground uplink microwave data and transmits the multiplexed laser downlink transmission control information to the satellite-borne link control and system selection unit through the microwave uplink.
The microwave link channel estimation is completed on the ground, the satellite-borne microwave transmitting system transmits pseudo-random code microwave signals to the ground, the ground laser microwave hybrid terminal receives the microwave signals through the ground microwave receiving system and outputs the microwave signals to the downlink channel estimation unit, the downlink channel estimation unit calculates the error rate and the microwave channel signal-to-noise ratio, the error rate and the microwave channel signal-to-noise ratio are compared with the threshold value, the comparison result is sent to the ground link control and system selection unit, and meanwhile, the ground microwave transmitting system multiplexes the microwave downlink transmission control information with the ground uplink microwave data and then transmits the microwave downlink transmission control information to the satellite-borne link control and system selection unit through the microwave uplink.
When the satellite is in downlink communication, downlink data enter a satellite-borne framing processor of a satellite-borne link control and system selection unit to carry out data framing processing to obtain framed data, the framed data enter a satellite-borne buffer memory to be buffered, when the data of the satellite-borne buffer memory is stored fully, the data frame starts to be output, the data frame firstly enters a satellite-borne channel discrimination controller, whether a laser communication link is interrupted or not is judged according to a comparison result of a downlink channel estimation unit, if the laser link is interrupted, the data frame is sent into a satellite-borne data identifier, service data with high priority is selected to be downloaded through a satellite-borne microwave transmission system, and the service data with low priority is discarded; if the laser communication link is normal, downloading the data frame through the satellite-borne laser transmitting system; and the satellite-borne link control and system selection unit determines a downlink transmission system, a coding mode, an interleaving depth, a modulation system and a transmitting power of a laser link, and a coding mode, a modulation system and a microwave channel gain of a microwave link according to the result of the channel estimation unit.
The ground laser and microwave hybrid terminal receives laser data and microwave data through a ground laser receiving system and a ground microwave receiving system, and a ground link control and system selection unit judges the available conditions of a laser communication link and a microwave communication link according to a downlink channel estimation result, and if the current laser communication link is interrupted, the data of the microwave communication link is directly received and output; if the current laser communication link is normal, receiving data of the laser communication link, decoding and correcting errors, if the data is correct, outputting the data to a user, if the data is checked to be wrong, triggering a retransmission instruction, sending the retransmission instruction to a satellite-borne laser microwave mixed load through a ground microwave transmitting system, after the satellite-borne laser microwave mixed load receives the retransmission instruction, transmitting a data frame needing to be retransmitted to the ground through the satellite-borne microwave transmitting system, and outputting the data to the user after the ground laser microwave mixed terminal receives the retransmitted data frame through a ground microwave receiving system.
When satellite uplink communication is performed, ground uplink data is subjected to data framing processing through a ground framing processor of a ground link control and system selection unit to obtain framed data, the framed data enters a ground buffer memory for buffering, when the data storage of the ground buffer memory is full, the data frame starts to output a data frame, a ground channel discrimination controller is used for judging whether a laser communication link is interrupted or not according to an estimation result of an uplink channel estimation unit, if the laser communication link is interrupted, the data frame is sent into a ground data identifier, service data with high priority is selected to be transmitted through a ground microwave transmission system, and service data with low priority is discarded; if the laser communication link is normal, transmitting the data frame through a ground laser transmitting system; the ground link control and system selection unit determines an uplink transmission system according to the result of the channel estimation unit, and the coding mode, the interleaving depth, the modulation system and the transmitting power of the laser link, and the coding mode, the modulation system and the microwave channel gain of the microwave link.
The satellite-borne laser microwave mixed load receives laser signals and microwave signals emitted by the ground through a satellite-borne laser receiving system and a satellite-borne microwave receiving system, a satellite-borne link control and system selection unit judges the condition of a laser communication link according to the estimation result of an uplink channel estimation unit, if the current laser communication link is interrupted, the data of the microwave communication link is directly received, decoding and demodulation are completed, and then the data are output to a user; and if the current laser communication link is normal, receiving the data of the laser communication link, decoding and correcting errors, if the data is correct, outputting the data to a user, if the data is checked to be wrong, triggering a retransmission instruction, sending the retransmission instruction to the ground through a satellite-borne microwave transmitting system, and after receiving the retransmission instruction, transmitting a data frame to be retransmitted to a satellite-borne laser microwave mixed load through the ground microwave transmitting system, and sending the received retransmission data frame to the user by the satellite-borne laser microwave mixed load.
In a word, the invention adopts the microwave and laser to establish link transmission with the ground station at the same time, adopts a satellite-ground system laser microwave channel estimation and link control mode to realize laser microwave hybrid cooperative transmission, and improves the availability of a satellite-ground high-speed link through a microwave link retransmission mode. The invention can effectively ensure the reliable transmission of satellite-ground communication data, and is particularly suitable for a high-speed data transmission system for high-low orbit satellite communication.
Claims (1)
1. The satellite communication system comprises a satellite-borne laser microwave mixed load and a ground laser microwave mixed terminal, wherein the satellite-borne laser microwave mixed load comprises a satellite-borne laser emission system, a satellite-borne microwave emission system, a satellite-borne laser receiving system and a satellite-borne microwave receiving system, and the ground laser microwave mixed terminal comprises a ground laser emission system, a ground microwave emission system, a ground laser receiving system and a ground microwave receiving system; the satellite-borne laser microwave hybrid load is characterized by further comprising an uplink channel estimation unit and a satellite-borne link control and system selection unit, and the ground laser microwave hybrid terminal further comprises a downlink channel estimation unit and a ground link control and system selection unit; the satellite-borne link control and system selection unit comprises a satellite-borne framing processor, a satellite-borne buffer memory, a satellite-borne channel discrimination controller and a satellite-borne data identifier; the ground link control and system selection unit comprises a ground framing processor, a ground buffer memory, a ground channel discrimination controller and a ground data identifier; the satellite-borne microwave transmitting system and the ground microwave receiving system form a microwave downlink, the ground microwave transmitting system and the satellite-borne microwave receiving system form a microwave uplink, and the microwave uplink and the microwave downlink form a microwave communication link; the satellite-borne laser transmitting system and the ground laser receiving system form a laser downlink, the ground laser transmitting system and the satellite-borne laser receiving system form a laser uplink, and the laser uplink and the laser downlink form a laser communication link;
before satellite-ground communication, carrying out uplink and downlink channel estimation; when estimating a laser uplink channel, a ground laser transmitting system transmits a pseudo-random code laser signal to a satellite-borne laser microwave mixed load, the satellite-borne laser microwave mixed load receives the laser signal through a satellite-borne laser receiving system and outputs the laser signal to an uplink channel estimating unit, the uplink channel estimating unit counts the error rate and the error frame number, and the error rate and the error frame number are compared with a threshold value, and a comparison result is transmitted to a satellite-borne link control and system selection unit; meanwhile, the satellite-borne microwave transmitting system multiplexes the laser uplink transmission control information and the satellite-borne downlink microwave data and transmits the multiplexed laser uplink transmission control information and the satellite-borne downlink microwave data to the ground link control and system selection unit through the microwave downlink; when estimating a laser downlink channel, a satellite-borne laser transmitting system transmits a pseudo-random code laser signal to the ground, a ground laser microwave hybrid terminal receives the laser signal through a ground laser receiving system and outputs the laser signal to a downlink channel estimating unit, the downlink channel estimating unit calculates an error rate and compares the error rate with a threshold value, a comparison result is sent to a ground link control and system selection unit, and meanwhile, the ground microwave transmitting system multiplexes laser downlink transmission control information and ground uplink microwave data and transmits the multiplexed laser downlink transmission control information and ground uplink microwave data to the satellite-borne link control and system selection unit through a microwave uplink;
the microwave link channel estimation is completed on the ground, the satellite-borne microwave transmitting system transmits pseudo-random code microwave signals to the ground, the ground laser microwave hybrid terminal receives the microwave signals through the ground microwave receiving system and outputs the microwave signals to the downlink channel estimation unit, the downlink channel estimation unit calculates the error rate and the microwave channel signal-to-noise ratio, the error rate and the microwave channel signal-to-noise ratio are compared with the threshold value, the comparison result is sent to the ground link control and system selection unit, and meanwhile, the ground microwave transmitting system multiplexes the microwave downlink transmission control information with the ground uplink microwave data and then transmits the microwave downlink transmission control information to the satellite-borne link control and system selection unit through the microwave uplink;
when the satellite is in downlink communication, downlink data enter a satellite-borne framing processor of a satellite-borne link control and system selection unit to carry out data framing processing to obtain framed data, the framed data enter a satellite-borne buffer memory to be buffered, when the data of the satellite-borne buffer memory is stored fully, the data frame starts to be output, the data frame firstly enters a satellite-borne channel discrimination controller, whether a laser communication link is interrupted or not is judged according to a comparison result of a downlink channel estimation unit, if the laser link is interrupted, the data frame is sent into a satellite-borne data identifier, service data with high priority is selected to be downloaded through a satellite-borne microwave transmission system, and the service data with low priority is discarded; if the laser communication link is normal, downloading the data frame through the satellite-borne laser transmitting system;
the ground laser and microwave hybrid terminal receives laser data and microwave data through a ground laser receiving system and a ground microwave receiving system, and a ground link control and system selection unit judges the available conditions of a laser communication link and a microwave communication link according to a downlink channel estimation result, and if the current laser communication link is interrupted, the data of the microwave communication link is directly received and output; if the current laser communication link is normal, receiving data of the laser communication link, decoding and correcting errors, if the data is correct, outputting the data to a user, if the data is checked to be wrong, triggering a retransmission instruction, sending the retransmission instruction to a satellite-borne laser microwave mixed load through a ground microwave transmitting system, after the satellite-borne laser microwave mixed load receives the retransmission instruction, transmitting a data frame to be retransmitted to the ground through the satellite-borne microwave transmitting system, and outputting the data to the user after the ground laser microwave mixed terminal receives the retransmitted data frame through a ground microwave receiving system;
when satellite uplink communication is performed, ground uplink data is subjected to data framing processing through a ground framing processor of a ground link control and system selection unit to obtain framed data, the framed data enters a ground buffer memory for buffering, when the data storage of the ground buffer memory is full, the data frame starts to output a data frame, a ground channel discrimination controller is used for judging whether a laser communication link is interrupted or not according to an estimation result of an uplink channel estimation unit, if the laser communication link is interrupted, the data frame is sent into a ground data identifier, service data with high priority is selected to be transmitted through a ground microwave transmission system, and service data with low priority is discarded; if the laser communication link is normal, transmitting the data frame through a ground laser transmitting system;
the satellite-borne laser microwave mixed load receives laser signals and microwave signals emitted by the ground through a satellite-borne laser receiving system and a satellite-borne microwave receiving system, a satellite-borne link control and system selection unit judges the condition of a laser communication link according to the estimation result of an uplink channel estimation unit, if the current laser communication link is interrupted, the data of the microwave communication link is directly received, decoding and demodulation are completed, and then the data are output to a user; and if the current laser communication link is normal, receiving the data of the laser communication link, decoding and correcting errors, if the data is correct, outputting the data to a user, if the data is checked to be wrong, triggering a retransmission instruction, sending the retransmission instruction to the ground through a satellite-borne microwave transmitting system, and after receiving the retransmission instruction, transmitting a data frame to be retransmitted to a satellite-borne laser microwave mixed load through the ground microwave transmitting system, and sending the received retransmission data frame to the user by the satellite-borne laser microwave mixed load.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295384A (en) * | 1999-11-09 | 2001-05-16 | 布达泰克有限公司 | Laser and microwave hydrid communication method and system |
| US20130156439A1 (en) * | 2011-12-20 | 2013-06-20 | Ruag Schweiz Ag | Method for optical data transmission from low earth orbit to earth and corresponding communication system |
| CN113422643A (en) * | 2021-02-10 | 2021-09-21 | 淮南师范学院 | Mixed FSO/RF self-adaptive switching communication method based on meteorological big data prediction |
| CN113507347A (en) * | 2021-06-07 | 2021-10-15 | 西安理工大学 | Soft switching method for laser and microwave hybrid communication |
| CN115694638A (en) * | 2022-11-03 | 2023-02-03 | 上海航天测控通信研究所 | Laser microwave mixing self-adaptive satellite-ground data transmission device |
| CN116032396A (en) * | 2022-11-07 | 2023-04-28 | 中国空间技术研究院 | System model construction method and system simulation method for low-orbit constellation system |
| CN117097396A (en) * | 2023-10-16 | 2023-11-21 | 北京融为科技有限公司 | Method and system for transmitting data between satellite and ground |
-
2023
- 2023-12-28 CN CN202311823825.9A patent/CN117478209A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295384A (en) * | 1999-11-09 | 2001-05-16 | 布达泰克有限公司 | Laser and microwave hydrid communication method and system |
| US20130156439A1 (en) * | 2011-12-20 | 2013-06-20 | Ruag Schweiz Ag | Method for optical data transmission from low earth orbit to earth and corresponding communication system |
| CN113422643A (en) * | 2021-02-10 | 2021-09-21 | 淮南师范学院 | Mixed FSO/RF self-adaptive switching communication method based on meteorological big data prediction |
| CN113507347A (en) * | 2021-06-07 | 2021-10-15 | 西安理工大学 | Soft switching method for laser and microwave hybrid communication |
| CN115694638A (en) * | 2022-11-03 | 2023-02-03 | 上海航天测控通信研究所 | Laser microwave mixing self-adaptive satellite-ground data transmission device |
| CN116032396A (en) * | 2022-11-07 | 2023-04-28 | 中国空间技术研究院 | System model construction method and system simulation method for low-orbit constellation system |
| CN117097396A (en) * | 2023-10-16 | 2023-11-21 | 北京融为科技有限公司 | Method and system for transmitting data between satellite and ground |
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