Autonomous data transmission satellite-ground planning method based on random access

Abstract

The invention relates to an autonomous data transmission satellite-ground planning method and system based on random access. The method comprises the following steps: carrying out initial parameter setting on a ground scheduling system and a satellite task planning module; satellite transit, the ground system and the satellite system perform uplink and downlink communication through the measurement and control ground station and the satellite measurement and control module, so that the satellite system obtains load task planning information and performs load task autonomous planning; the satellite leaves, and the satellite system completes a load task and obtains a load data volume; the satellite passes, and the ground system and the satellite system carry out a random access process; the satellite system carries out data transmission task autonomous planning, and ground station resources needed by data transmission are determined; and the satellite system initiates a data transmission ground station resource application to the ground system based on the random access communication, and performs a data transmission task according to the applied data transmission ground station resource. According to the method, the problem of resource application of the satellite autonomous planning data transmission ground station can be effectively solved, so that the satellite autonomously completes load and data transmission task planning work.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite telemetry, and particularly to a satellite-ground method for autonomous data transmission planning based on opportunistic access. Background Art

[0002] At present, the main tasks of the ground planning system are to complete the task planning of satellite on-orbit payloads, data transmission, etc. systems, and to apply for data transmission ground resources according to the payload data volume. To solve the problem of insufficient ground planning resources, satellites developed at present are usually equipped with autonomous task planning systems. The task planning system can receive information such as payload working modes, multiple task objectives, priorities of the objectives, data transmission working modes, data transmission ground stations, etc. sent from the ground, and complete the autonomous planning of satellite tasks according to the working conditions of the satellite, including the execution time, sequence, number of times, mode of multiple task objectives by the payload, and the execution time, number of times, mode of data transmission, etc. However, in the actual application of task planning, the ground often does not know the size of the payload data volume after task planning, that is, it is unable to provide data transmission ground station resource information in advance. The ground usually needs to arrange a parallel ground task planning system to complete the evaluation of the payload data volume in advance, and apply for data transmission ground station resources according to the payload data volume. At present, the satellite task planning system has not completely replaced the ground planning. Therefore, how the satellite realizes the autonomous planning of data transmission ground station resource application is the main problem that the current satellite task planning system needs to solve. Summary of the Invention

[0003] To solve the above technical problems existing in the prior art, the object of the present invention is to provide a satellite-ground method for autonomous data transmission planning based on opportunistic access, which can effectively solve the problem of autonomous planning of data transmission ground station resource application by the satellite, so as to realize the satellite's autonomous completion of payload and data transmission task planning work.

[0004] To achieve the above object of the invention, the present invention provides a satellite-ground method for autonomous data transmission planning based on opportunistic access, specifically including the following steps:

[0005] Step S1, perform parameter initial settings on the ground scheduling system of the ground system and the satellite task planning module of the satellite system;

[0006] Step S2, when the satellite passes by, the ground system and the satellite system perform uplink and downlink communication through the ground measurement and control station and the satellite measurement and control module, so that the satellite system obtains payload task planning information and performs autonomous payload task planning;

[0007] Step S3, when the satellite departs, the satellite system completes the payload task according to the autonomous payload task planning result and obtains the payload data volume;

[0008] Step S4, satellite transit. The ground system and the satellite system perform an opportunistic access process with the opportunistic TT&C ground station through the satellite opportunistic TT&C module;

[0009] Step S5, the satellite system performs autonomous planning of the data transmission task through the satellite mission planning module to determine the ground station resources required for data transmission;

[0010] Step S6, based on the successful opportunistic access, the satellite system initiates an application for data transmission ground station resources to the ground system through opportunistic access communication, and performs the data transmission task according to the applied data transmission ground station resources.

[0011] According to a technical solution of the present invention, the parameters of the ground scheduling system include the number Q of TT&C ground stations, the number N of opportunistic TT&C ground stations, the number M of data transmission ground stations available for task planning applications, the serial number j of the TT&C ground station communicating with the satellite, the serial number i of the opportunistic TT&C ground station accessing the satellite, and the number K of resource conflicts in the data transmission ground station application;

[0012] The parameters of the satellite mission planning module include the number L of data transmission ground station resources required for payload data transmission.

[0013] According to a technical solution of the present invention, in the step S2, it specifically includes:

[0014] Step S21, the ground scheduling system selects the TT&C ground station j for satellite uplink and downlink communication;

[0015] Step S22, the ground scheduling system sends the payload task planning information to the satellite through the selected TT&C ground station j; the payload task planning information includes the payload task working mode, multiple task objectives and their priorities, and the number of ground stations available for data transmission ground station resource applications;

[0016] Step S23, the satellite system obtains the payload task planning information through the satellite TT&C module and forwards it to the satellite mission planning module through the on-board computer. The satellite mission planning module performs autonomous planning of the satellite payload task according to the payload task planning information, satellite attitude information and satellite position information, and generates a program control instruction and a program control data block and sends them to the on-board computer.

[0017] According to a technical solution of the present invention, in the step S4, it specifically includes:

[0018] Step S41, when the satellite transits, after the satellite opportunistic TT&C module completes locking, demodulation and verification with the opportunistic access broadcast sent by the opportunistic TT&C ground station, it returns an access application signal to the opportunistic TT&C ground station;

[0019] Step S42: The opportunistic measurement and control ground station verifies and judges the content of the access application signal. If it passes, it approves the access request and sends an opportunistic access broadcast with the satellite ID set.

[0020] Step S43: The satellite opportunistic measurement and control module receives the opportunistic access broadcast with the satellite ID set and parses out the satellite ID of this satellite, determining that the opportunistic access is passed.

[0021] According to a technical solution of the present invention, in the step S5, it specifically includes:

[0022] The satellite mission planning module autonomously plans the satellite data transmission mission according to the payload data volume, the available ground stations for data transmission and their corresponding available times, and the satellite position, and determines that the ground station resources required for data transmission are L.

[0023] According to a technical solution of the present invention, in the step S6, it specifically includes:

[0024] Step S61: According to the opportunistic access passing, the satellite system deletes the applied data transmission ground station resources, generates an opportunistic reverse short message containing M data transmission ground station resource applications, and sends it to the ground system through the satellite opportunistic measurement and control module.

[0025] Step S62: The ground scheduling system compares and judges the M data transmission ground station application resources with the existing available data transmission ground station resources. If K = M or K = M - 1, it executes step S64. If K < M - 1, it selects 1 data transmission ground station resource with the data transmission time closest to the current time and executes step S65.

[0026] Step S64: The ground scheduling system generates an opportunistic forward short message indicating that the data transmission ground station resource application fails and forwards it to the satellite opportunistic measurement and control module through the opportunistic measurement and control ground station, and then the satellite opportunistic measurement and control module forwards it to the satellite mission planning module, and executes step S5.

[0027] Step S65: The ground scheduling system sends the applied data transmission ground station resources to the corresponding data transmission ground stations, generates an opportunistic forward short message indicating that the data transmission ground station resource application passes, forwards it to the satellite opportunistic measurement and control module through the opportunistic measurement and control ground station, and then the satellite opportunistic measurement and control module forwards it to the satellite mission planning module. The satellite mission planning module generates a program control instruction and a program control data block for the corresponding data transmission mission according to the opportunistic forward short message indicating that the data transmission ground station resource application passes and sends them to the satellite on-board computer; the satellite mission planning module sets L = L - 1 and judges L. If L is equal to 0, it executes step S66. If L is greater than 0, it executes step S61.

[0028] Step S66: According to the received program control instruction and program control data block, the on-board computer executes at the corresponding satellite time to complete the data transmission task.

[0029] According to one aspect of the present invention, a satellite-ground system for autonomous data transmission planning based on opportunistic access is provided to implement the above method, including:

[0030] A satellite system, including an on-board computer set on the satellite, and a satellite mission planning module, a satellite TT&C module, a satellite opportunistic TT&C module, and a satellite data transmission module electrically connected to the on-board computer;

[0031] A ground system, including a ground scheduling system, and a number of TT&C ground stations, a number of opportunistic TT&C ground stations, and a number of data transmission ground stations electrically connected to the ground scheduling system.

[0032] According to one technical solution of the present invention, the TT&C module includes:

[0033] A TT&C transponder and a microwave network connected to the TT&C transponder, and the TT&C transponder is connected to the microwave network and the on-board computer;

[0034] A first TT&C antenna and a second TT&C antenna, which are communicatively connected to the TT&C transponder through the microwave network.

[0035] According to one technical solution of the present invention, the opportunistic module includes:

[0036] An opportunistic antenna, which is used to receive opportunistic access signals from the opportunistic TT&C ground station and forward opportunistic reverse short message signals to the opportunistic TT&C ground station;

[0037] An opportunistic forward short message antenna, which is used to receive opportunistic forward short message signals from the opportunistic TT&C ground station;

[0038] An opportunistic TT&C transponder, which is connected to the opportunistic antenna, the opportunistic forward short message antenna, and the on-board computer.

[0039] According to one technical solution of the present invention, the data transmission module includes:

[0040] A data transmission integrated machine, which is connected to the on-board computer;

[0041] A data transmission phased array antenna, which is used to receive the beam pointing result sent by the data transmission integrated machine to complete the corresponding beam pointing; and is used to receive the data transmission signal sent by the data transmission integrated machine, amplify it and send it out.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The present invention proposes a satellite-ground method for autonomous data transmission planning based on opportunistic access, which uses opportunistic access to assist the satellite system and the ground system in applying for ground resources for data transmission and autonomously planning satellite data transmission tasks. It can replace the ground planning in the conventional situation and greatly reduce the occupation of ground planning resources by the satellite.

[0044] When the present invention is applied, it sends opportunistic reverse short messages for applying for data transmission resources to apply for multiple data transmission resources. The ground scheduling system judges and responds to the conflicts of the applications, which can effectively improve the efficiency of application passing and reduce the occupancy rate of the ground scheduling system.

[0045] The present invention utilizes the ground scheduling system to be able to schedule multiple TT&C ground stations, multiple opportunistic TT&C ground stations, and multiple data transmission ground stations, and has good scalability.

[0046] The present invention can also be applied to autonomous data transmission planning after multiple payload missions, can be applied to payload data with different data volumes, and has no restrictions on satellite payload types and data transmission modulation types, and has strong applicability. Brief Description of the Drawings

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 Schematically showing the flowchart of the satellite-ground method for autonomous data transmission planning based on opportunistic access provided in an embodiment of the present invention;

[0049] Figure 2 Schematically showing the structural diagram of the satellite-ground system for autonomous data transmission planning based on opportunistic access in an embodiment of the present invention;

[0050] Figure 3 Schematically showing the specific flowchart of the satellite-ground method for autonomous data transmission planning based on opportunistic access in another embodiment of the present invention. Detailed Embodiments

[0051] The description of the embodiments of this specification should be combined with the corresponding drawings, and the drawings should be regarded as a part of the complete specification. In the drawings, the shape or thickness of the embodiments can be enlarged and simplified or conveniently marked. Furthermore, the parts of each structure in the drawings will be described separately. It should be noted that the elements not shown or described in words in the drawings are in the forms known to those of ordinary skill in the art.

[0052] In the description of the embodiments herein, any reference to directions and orientations is for convenience of description only and should not be construed as any limitation on the scope of protection of the present invention. The following description of the preferred embodiments will involve combinations of features, which may exist independently or in combination. The present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0053] As Figure 1 shown, the satellite-ground method for autonomous data transmission planning based on opportunistic access provided by the present invention includes the following steps:

[0054] Step S1: Perform parameter initial settings on the ground scheduling system of the ground system and the satellite mission planning module of the satellite system;

[0055] Step S2: When the satellite transits, the ground system and the satellite system perform uplink and downlink communications through the TT&C ground station and the satellite TT&C module, so that the satellite system obtains the payload mission planning information and performs autonomous payload mission planning;

[0056] Step S3: When the satellite departs, the satellite system completes the payload mission according to the autonomous payload mission planning result and obtains the payload data volume;

[0057] Step S4: When the satellite transits, the ground system and the satellite system perform an opportunistic access process through the satellite opportunistic TT&C module and the opportunistic TT&C ground station;

[0058] Step S5: The satellite system performs autonomous data transmission mission planning through the satellite mission planning module to determine the ground station resources required for data transmission;

[0059] Step S6: Based on the successful opportunistic access, the satellite system initiates an application for data transmission ground station resources to the system through opportunistic access communication, and performs the data transmission mission according to the applied data transmission ground station resources.

[0060] The method provided by the present invention can effectively solve the problem of applying for data transmission ground station resources in satellite autonomous planning, so as to realize the satellite's autonomous completion of payload and data transmission mission planning work.

[0061] As Figure 2 shown, in another embodiment of the present invention, an satellite-ground system for autonomous data transmission planning based on opportunistic access is provided, including a satellite system and a ground system. The satellite system includes an on-board computer set on the satellite, a satellite mission planning module, a satellite TT&C module, a satellite opportunistic TT&C module, and a satellite data transmission module connected to the on-board computer, as well as a GNSS navigation module, an attitude control device, and a payload device connected to the on-board computer. The ground system includes a ground scheduling system and a plurality of TT&C ground stations, a plurality of opportunistic TT&C ground stations, and a plurality of data transmission ground stations electrically connected to the ground scheduling system.

[0062] The satellite service computer is connected to the satellite mission planning module, satellite TT&C module, satellite contingency TT&C module, satellite data transmission module, GNSS navigation module, attitude control equipment, and payload equipment through the satellite bus to achieve the instruction sending and telemetry polling of each single unit. The satellite service computer is connected to the TT&C transponder of the satellite TT&C module to achieve the transmission of remote control and telemetry PCM. The main functions of the satellite service computer include: for telemetry data acquisition, quantization, coding, packetization, framing, verification, encryption, and scrambling; receiving the PCM code stream of direct remote control instructions, indirect instructions, and injected data, receiving and executing program-controlled instructions and program-controlled data blocks, frame synchronization, decryption, frame recognition, frame extraction, verification, injected data output, key management, and update.

[0063] The TT&C module includes a TT&C transponder, a microwave network, a first TT&C antenna, and a second TT&C antenna. The TT&C transponder is respectively connected to the satellite service computer and the microwave network. The main functions of the TT&C transponder include: demodulating and decoding the uplink TT&C signal sent by the microwave network to obtain remote control data; verifying the obtained remote control data and outputting it to the satellite service computer; receiving the overall satellite telemetry data sent by the satellite service computer, performing channel coding and modulation to generate a downlink TT&C signal, and sending it to the microwave network. The main functions of the microwave network include: forwarding the uplink remote control signal sent by the TT&C antenna to the TT&C transponder; forwarding the downlink telemetry signal sent by the TT&C transponder to the TT&C antenna. The first TT&C antenna and the second TT&C antenna are connected to the microwave network. The functions of the first and second TT&C antennas are the same and mainly include: receiving the uplink remote control signal sent by the TT&C ground station and forwarding it to the microwave network; receiving the downlink telemetry signal and transmitting it.

[0064] The satellite opportunistic TT&C module includes an opportunistic antenna, an opportunistic forward short message antenna, and an opportunistic TT&C transponder. The opportunistic TT&C transponder is respectively connected to the opportunistic antenna and the opportunistic forward short message antenna. The main functions of the opportunistic TT&C transponder include: being used to receive, depacketize, and demodulate the opportunistic forward short message signal sent by the ground TT&C station, decode the data, and output it to the on-board computer or mission planning; being used to receive, depacketize, and demodulate the uplink opportunistic access signal sent by the ground TT&C station, and decode and process the data; being used to receive the opportunistic return short message data sent by the on-board computer, encode, modulate, and spread-spectrum the data, and then transmit it through the opportunistic antenna; being used to generate the telemetry of the opportunistic TT&C transponder itself and send it to the on-board computer and mission planning; being used to receive the instructions sent by the on-board computer and return the reception response; being used to receive the telemetry polling sent by the on-board computer and return the telemetry. The main functions of the opportunistic antenna include: receiving the opportunistic access signal from the opportunistic TT&C ground station and forwarding it to the opportunistic TT&C transponder for processing; and forwarding the opportunistic return short message signal emitted from the opportunistic TT&C transponder to the opportunistic TT&C ground station. The main function of the opportunistic forward short message antenna includes: receiving the opportunistic forward short message signal from the opportunistic TT&C ground station and forwarding it to the opportunistic TT&C transponder for processing.

[0065] The satellite mission planning module is connected to the opportunistic TT&C transponder through the satellite bus. The main functions of the satellite mission planning module include: being used to receive the mission information sent by the on-board computer, including but not limited to the payload working mode, multiple mission objectives, the priority of the objectives, the payload working time period, etc.; being used to complete the mission planning of the payload, generate the program control instructions and program control data blocks, and send them to the on-board computer; being used to judge the satellite opportunistic access situation according to the telemetry information sent by the opportunistic TT&C transponder; being used to judge the payload data volume according to the telemetry information sent by the data transmission integrated machine; being used to plan the resource application information of the data transmission ground station according to the satellite orbit, payload data volume, and the position of the data transmission ground station, and send it to the opportunistic TT&C transponder; being used to receive the opportunistic short message information of the resource application result of the data transmission ground station sent by the opportunistic TT&C transponder; being used to complete the mission planning of the data transmission according to the payload data volume and the application ground station result, generate the program control instructions and program control data blocks, and send them to the on-board computer; being used to receive the instructions sent by the on-board computer and return the reception response; being used to receive the telemetry polling sent by the on-board computer and return the telemetry.

[0066] The data transmission module includes an integrated data transmission unit and a phased array data transmission antenna. One end of the integrated data transmission unit is connected to the payload device, and the other end is connected to the phased array data transmission antenna. The main functions of the integrated data transmission unit include: receiving and storing payload data; formatting, encrypting, verifying, encoding, scrambling, and modulating the payload data and sending it to the phased array data transmission antenna; receiving the attitude broadcast sent by the attitude control device and the positioning broadcast sent by the GNSS receiver, completing the beam pointing calculation of the phased array data transmission antenna to the ground station, and sending the calculation result to the phased array data transmission antenna; receiving the instructions sent by the on-board computer and returning the reception response; receiving the telemetry polling sent by the on-board computer and returning the telemetry. The main functions of the phased array data transmission antenna include: receiving the beam pointing result sent by the integrated data transmission unit and completing the corresponding beam pointing; receiving the data transmission signal sent by the integrated data transmission unit, amplifying it, and sending it out.

[0067] The GNSS navigation module includes a GNSS receiver and a GNSS antenna. The GNSS receiver is connected to the on-board computer, the integrated data transmission unit, and the payload through the satellite bus. The main functions of the GNSS receiver include: receiving the GPS and BD navigation signals sent by the GNSS antenna, demodulating and resolving the received signals, and sending the time and position information in the form of a positioning broadcast to the on-board computer, the integrated data transmission unit, and the payload; receiving the instructions sent by the on-board computer and returning the reception response; receiving the telemetry polling sent by the on-board computer and returning the telemetry. The main functions of the GNSS antenna include: receiving the navigation signals sent by the GPS navigation system and the BD navigation system and forwarding them to the GNSS receiver.

[0068] The attitude control device is connected to the on-board computer, the integrated data transmission unit, and the payload through the satellite bus. The main functions of the attitude control device include: controlling and adjusting the satellite attitude through attitude control devices such as star sensors, sun sensors, and momentum wheels, and sending the time and attitude information in the form of an attitude broadcast to the on-board computer, the integrated data transmission unit, and the payload; receiving the instructions sent by the on-board computer and returning the reception response; receiving the telemetry polling sent by the on-board computer and returning the telemetry.

[0069] One end of the payload device is connected to the on-board computer, the GNSS receiver, and the attitude control device through the satellite bus, and the other end is connected to the integrated data transmission unit. The main functions of the payload device include: completing the satellite payload task by receiving the attitude broadcast sent by the attitude control device and the positioning broadcast sent by the GNSS receiver; receiving the instructions sent by the on-board computer and returning the reception response; receiving the telemetry polling sent by the on-board computer and returning the telemetry.

[0070] A ground station resource refers to a certain period of time of a data transmission ground station occupied by a satellite. For the same satellite, only one ground station resource can be occupied at the same time. For the same ground station, two different time periods are two ground station resources.

[0071] In this embodiment, there are P measurement and control ground stations, N opportunistic measurement and control ground stations, and M data transmission ground stations, which are respectively connected to the ground station scheduling system. The main functions of the ground station scheduling system include: sending uplink remote control information to the measurement and control ground stations; receiving downlink telemetry information sent by the measurement and control ground stations; receiving opportunistic return short messages, parsing the information of the satellite applying for the ground station, including data transmission time, required ground station for data transmission, etc., and comparing with the existing data transmission ground station resources to complete the judgment; sending scheduling instructions to the data transmission ground stations, including information such as data transmission task execution time, data transmission configuration, etc.; generating an instruction for allowing the execution of the opportunistic forward short message for the satellite data transmission ground station resource application and sending it to the opportunistic measurement and control ground station. The main functions of the measurement and control ground station include: sending the uplink remote control signal to the satellite; receiving the downlink telemetry signal sent by the satellite and forwarding it to the ground station scheduling system. The main functions of the opportunistic measurement and control ground station include: sending the opportunistic access broadcast signal to the satellite; sending the opportunistic forward short message signal to the satellite; receiving the opportunistic return short message signal sent by the satellite and forwarding it to the ground station scheduling system. The main functions of the data transmission ground station include: receiving, demodulating, and decoding the data transmission signal; receiving the scheduling instructions sent by the ground station scheduling system, including information such as data transmission task execution time, data transmission configuration, etc.

[0072] As Figure 3 shown, in this embodiment, a satellite-ground method for autonomous data transmission planning based on opportunistic access provided by the present invention specifically includes:

[0073] 1) Set parameters inside the ground scheduling system: the number of measurement and control ground stations is Q; the number of opportunistic measurement and control ground stations is N; the number of data transmission ground stations available for task planning application is M; the serial number of the measurement and control ground station communicating with the satellite is j, and the value range of j is [1, Q]; the serial number of the opportunistic measurement and control ground station accessing the satellite is i, and the value range of i is [1, N]; the number of data transmission ground station application resource conflicts is K. Set parameters inside the task planning: the data transmission of the payload requires L data transmission ground station resources;

[0074] 2) When the satellite passes by, the ground scheduling system selects the tracking and control ground station j from the tracking and control ground stations 1, 2, …, N to complete the uplink and downlink communication with the satellite. The satellite ground scheduling system sends the information required for mission planning, such as the payload working mode, multiple mission objectives, the priority of the objectives, and the number M of ground stations available for data transmission ground station resource applications, to the tracking and control transponder of the satellite through the tracking and control ground station j. After receiving the uplink telecommand signal, the tracking and control transponder sends it to the on-board computer after passing the verification, and the on-board computer then forwards it to mission planning. After receiving the corresponding information, mission planning completes the autonomous planning of the satellite payload mission according to information such as the satellite's attitude broadcast and positioning broadcast, generates the program control instructions and program control data blocks, and sends them to the on-board computer. The satellite departs.

[0075] 3) The on-board computer receives the program control instructions and program control data blocks and executes the program control instructions and program control data blocks at the corresponding satellite time. The satellite completes the payload mission, and the data transmission integrated machine records the payload data. Mission planning obtains the payload data volume through the telemetry of the data transmission integrated machine.

[0076] 4) The opportunistic tracking and control ground stations 1, 2, …, N respectively send opportunistic access broadcasts. When the satellite passes by, after the opportunistic tracking and control transponder receives the opportunistic broadcast signal sent by the opportunistic tracking and control ground station i, completes locking, demodulation, and verification, it sends a reverse access request signal.

[0077] 5) After the opportunistic tracking and control ground station i receives the reverse signal sent by the satellite, it verifies and judges the signal content. If it fails, it executes 4). If it passes, it agrees to the access request by setting the satellite ID in the opportunistic access broadcast; if it fails, it discards the signal. The verification and judgment of the content of the reverse access request signal include: verifying the legality of the satellite ID and the ground station node ID and judging the type of the frame length, frame type, etc. When the satellite ID and the ground station node ID pass the legality verification, the opportunistic tracking and control ground station i agrees to the access request and returns an opportunistic access broadcast of "request passed" according to the frame length and frame type in the reverse access request signal.

[0078] 6) After the opportunistic tracking and control transponder receives the opportunistic access broadcast and resolves the satellite ID of this satellite, the opportunistic tracking and control transponder's telemetry "opportunistic access criterion" is passed.

[0079] 7) Mission planning completes the autonomous planning of the satellite data transmission mission according to the payload data volume telemetry, available data transmission ground stations, available time of the corresponding data transmission ground stations, and positioning broadcast and other information sent by the data transmission integrated machine, and determines that L data transmission ground station resources are required for payload data transmission.

[0080] 8) After the mission planning receives that the telemetry measurement "ad hoc access criterion" of the ad hoc TT&C transponder passes, it eliminates the data transmission ground station resources that have been applied for, generates 1 ad hoc reverse short message containing M data transmission ground station resource applications, and sends it to the ad hoc TT&C transponder.

[0081] 9) The ad hoc TT&C transponder sends the ad hoc reverse short message signal to the ad hoc TT&C ground station i. After the ad hoc TT&C ground station i performs despreading, demodulation and verification and passes, it sends it to the ground scheduling system.

[0082] 10) The ground scheduling system compares and judges the M data transmission ground station application resources with the existing available data transmission ground station resources. If K = M, then execute 11). If K = M - 1, then execute 11). If K < M - 1, then select 1 data transmission ground station resource whose data transmission time is closest to the current time, and execute 12).

[0083] 11) The ad hoc TT&C ground station i receives and forwards the ad hoc forward short message with the data transmission ground station resource application not passing to the satellite. After the satellite ad hoc TT&C transponder receives it, it sends it to the mission planning, and execute 7).

[0084] 12) The ground scheduling system sends the applied data transmission ground station resources to the corresponding data transmission ground stations, and generates 1 ad hoc forward short message with the data transmission ground station resource application passing. The ad hoc TT&C ground station i receives and forwards it to the satellite. After the satellite ad hoc TT&C transponder receives it, it sends it to the mission planning. After the mission planning receives it, it generates the program control instructions and program control data blocks for the corresponding data transmission tasks, and sends them to the on-board computer. The mission planning sets L = L - 1, and the mission planning judges L. If L is equal to 0, then execute 13). If L is greater than 0, then execute 8).

[0085] 13) The on-board computer receives all the program control instructions and program control data blocks and executes them at the corresponding satellite time. The satellite completes the data transmission task, and the data transmission integrated machine replays the payload data.

[0086] 14) The mission planning completes the payload and data transmission planning, as well as the data transmission ground station resource application.

[0087] In this embodiment, the satellite payload type can be an optical payload, a SAR payload, etc., the data transmission modulation type can be QPSK, 8PSK, etc., and the data transmission frequency band can be, for example, X band, Ka band, etc.

[0088] It should be noted that the above description is the preferred embodiment of the present invention. It should be pointed out that although the preferred embodiments of the present invention have been described, for those skilled in the art of this technology, once the basic creative concept of the present invention is known, several improvements and refinements can be made without departing from the principles described in the present invention. These improvements and refinements should also be regarded as the protection scope of the present invention. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. An autonomous space-ground data transmission planning method based on opportunistic access, characterized in that Specifically, it includes the following steps: Step S1: Perform parameter initial settings on the ground scheduling system of the ground system and the satellite mission planning module of the satellite system; Step S2: When the satellite transits, the ground system and the satellite system conduct uplink and downlink communications through the TT&C ground station and the satellite TT&C module, so that the satellite system obtains the payload mission planning information and conducts autonomous payload mission planning; Step S3: When the satellite departs, the satellite system completes the payload mission according to the autonomous payload mission planning result and obtains the payload data volume; Step S4: When the satellite transits, the ground system and the satellite system conduct an opportunistic access process through the satellite opportunistic TT&C module and the opportunistic TT&C ground station; Step S5: The satellite system conducts autonomous planning of the data transmission mission through the satellite mission planning module to determine the ground station resources required for data transmission; Step S6: According to the successful opportunistic access, the satellite system initiates an application for data transmission ground station resources to the ground system based on the opportunistic access communication, and conducts the data transmission mission according to the applied data transmission ground station resources.

2. The method for autonomous data transmission planning between satellite and ground based on opportunistic access according to claim 1, wherein The parameters of the ground scheduling system include the number Q of TT&C ground stations, the number N of opportunistic TT&C ground stations, the number M of data transmission ground stations available for mission planning applications, the serial number j of the TT&C ground station communicating with the satellite, the serial number i of the opportunistic TT&C ground station accessing the satellite, and the number K of data transmission ground station application resource conflicts; The parameters of the satellite mission planning module include the number L of data transmission ground station resources required for payload data transmission.

3. The method for autonomous space-ground data transmission planning based on opportunistic access according to claim 2, wherein In the step S2, it specifically includes: Step S21: The ground scheduling system selects the TT&C ground station j for uplink and downlink communication with the satellite; Step S22: The ground scheduling system sends the payload mission planning information to the satellite through the selected TT&C ground station j; the payload mission planning information includes the payload mission working mode, multiple mission objectives and their priorities, and the number of ground stations available for data transmission ground station resource applications; Step S23: The satellite system obtains the payload mission planning information through the satellite TT&C module and forwards it to the satellite mission planning module through the on-board computer. The satellite mission planning module conducts autonomous planning of the satellite payload mission according to the payload mission planning information, satellite attitude information and satellite position information, and generates a programmed control instruction and a programmed control data block and sends them to the on-board computer.

4. The method for autonomous space-ground data transmission planning based on opportunistic access according to claim 2, characterized in that In the step S4, it specifically includes: Step S41: When the satellite transits, after the satellite opportunistic TT&C module completes locking, demodulation and verification with the opportunistic access broadcast sent by the opportunistic TT&C ground station, it returns an access application signal to the opportunistic TT&C ground station; Step S42: The opportunistic TT&C ground station verifies and judges the access application signal. If it passes, it agrees to the access request and sends an opportunistic access broadcast set with the satellite ID; Step S43: The satellite opportunistic TT&C module receives the opportunistic access broadcast set with the satellite ID and resolves the satellite ID of this satellite, and determines that the opportunistic access is successful.

5. The method for autonomous space-ground data transmission planning based on opportunistic access according to claim 2, wherein In the step S5, it specifically includes: The satellite mission planning module performs autonomous planning of the satellite data transmission mission based on the payload data volume, available ground stations for data transmission and their corresponding available times, and the satellite position, and determines that the ground station resources required for data transmission are L.

6. The method for autonomous space-ground data transmission planning based on opportunistic access according to claim 2, wherein In step S6, it specifically includes: Step S61: Through opportunistic access, the satellite system deletes the applied data transmission ground station resources, generates an opportunistic return short message containing M data transmission ground station resource applications, and sends it to the ground system through the satellite opportunistic measurement and control module. Step S62: The ground scheduling system compares and judges the M data transmission ground station application resources with the existing available data transmission ground station resources. If K = M or K = M - 1, then step S64 is executed. If K < M - 1, then it selects 1 data transmission ground station resource with the data transmission time closest to the current time and executes step S65. Step S64: The ground scheduling system generates an opportunistic forward short message indicating that the application for data transmission ground station resources is not approved, forwards it to the satellite opportunistic measurement and control module through the opportunistic measurement and control ground station, and then the satellite opportunistic measurement and control module forwards it to the satellite mission planning module to execute step S5. Step S65: The ground scheduling system sends the applied data transmission ground station resources to the corresponding data transmission ground stations, generates an opportunistic forward short message indicating that the application for data transmission ground station resources is approved, forwards it to the satellite opportunistic measurement and control module through the opportunistic measurement and control ground station, and then the satellite opportunistic measurement and control module forwards it to the satellite mission planning module. The satellite mission planning module generates a program control instruction and a program control data block for the corresponding data transmission mission according to the opportunistic forward short message indicating that the application for data transmission ground station resources is approved and sends them to the on-board computer; the satellite mission planning module sets L = L - 1, judges L. If L is equal to 0, then step S66 is executed. If L is greater than 0, then step S61 is executed. Step S66: The on-board computer executes according to the received program control instruction and program control data block at the corresponding satellite time to complete the data transmission mission.

7. A satellite-ground system for autonomous data transmission planning based on opportunistic access, which is used to implement the method according to any one of claims 1 to 6, characterized in that, It includes: A satellite system, including an on-board computer set on the satellite, and a satellite mission planning module, a satellite measurement and control module, a satellite opportunistic measurement and control module, and a satellite data transmission module electrically connected to the on-board computer; A ground system, including a ground scheduling system and a number of measurement and control ground stations, a number of opportunistic measurement and control ground stations, and a number of data transmission ground stations electrically connected to the ground scheduling system.

8. The satellite-ground system for autonomous data transmission planning based on opportunistic access according to claim 7, characterized in that, The measurement and control module includes: A measurement and control transponder and a microwave network connected to the measurement and control transponder. The measurement and control transponder is connected to the on-board computer through the microwave network; A first measurement and control antenna and a second measurement and control antenna, which are communicatively connected to the measurement and control transponder through the microwave network.

9. The satellite-ground system for autonomous data transmission planning based on opportunistic access according to claim 7, wherein The satellite opportunistic measurement and control module includes: An opportunistic antenna, which is used to receive the opportunistic access signal from the opportunistic measurement and control ground station and forward the opportunistic return short message signal to the opportunistic measurement and control ground station; An opportunistic forward short message antenna, which is used to receive the opportunistic forward short message signal from the opportunistic measurement and control ground station; An opportunistic measurement and control transponder, which is connected to the opportunistic antenna, the opportunistic forward short message antenna, and the on-board computer.

10. The satellite-ground system for autonomous data transmission planning based on opportunistic access according to claim 7, wherein The data transmission module includes: The data transmission integrated machine, which is connected to the satellite mission computer; The data transmission phased array antenna is used to receive the beam pointing result sent by the data transmission integrated machine and complete the corresponding beam pointing; it is used to receive the data transmission signal sent by the data transmission integrated machine, amplify it and then send it out.

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