Reliable multi-station collaborative distribution method and system for complex multi-scenario satellite communications

Abstract

The present invention discloses a reliable multi-station collaborative distribution method and system for complex multi-scenario satellite communications, and belongs to the field of satellite communication technology. The present invention is based on the Beidou unified time reference, combined with broadcast station ranging, to achieve the purpose of time synchronization of multiple broadcast stations, realize multi-path guarantee of multiple broadcast stations for a single user station, solve the system failure caused by faults, rain attenuation, etc. of a single broadcast station system, and effectively compensate for the reliability of a single broadcast station; through the design of a variable rate TDMA frame structure, multiple broadcast stations can use different rates and different time slots to multiplex a variable rate TDMA carrier, effectively compensating for the difference in receiving capabilities of multiple user stations; through the unified planning of the control center, multiple TDMA carriers can be used for simultaneous multiplexing to compensate for the system broadcast capacity. The present invention realizes efficient and collaborative reliable data distribution of multiple broadcast stations through multi-dimensional compensation such as multi-path, variable rate, and multi-carrier, combined with the unified planning and control of the control center, and is suitable for broadcast distribution applications with high reliability requirements.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a reliable multi-station collaborative distribution method and system for complex multi-scenario satellite communications. Background Art

[0002] Traditional satellite broadcast communication systems are mostly designed as star networks centered on broadcast transmission stations, and do not provide high reliability design guarantees for the service success rate of broadcast receiving stations. For example, satellite broadcasting and television systems generally only design conventional communication links for daily application scenarios, which can meet normal applications in most scenarios and large proportions of time periods. However, when the transmission performance of satellite links is greatly reduced due to factors such as heavy rainfall and malicious electromagnetic interference, service interruptions will occur for some users or even the entire system, which is allowed in the design of the above system.

[0003] However, for satellite broadcast communication systems with high reliability requirements, in order to combat known and unknown adverse factors, it is effective to deploy multiple broadcast stations in different locations to strengthen the transmission system and design multiple communication rate broadcast carriers to combat transmission link fluctuations. However, if an independent communication carrier is configured for each rate of each broadcast station, it may cause trouble for the signal receiving equipment of the broadcast receiving station. Configuring multiple receiving channels will lead to a significant increase in the volume of the broadcast receiving station equipment, and using one receiving channel to cyclically switch to receive signals of different frequencies / rates may lead to a deterioration in communication efficiency. Therefore, there is an urgent need for a variable rate TDMA carrier technology in the prior art. Summary of the invention

[0004] In view of this, the present invention proposes a reliable multi-station collaborative distribution method and system for complex multi-scenario satellite communications. Based on traditional TDMA technology and variable rate communication technology, the present invention realizes highly reliable and highly guaranteed satellite broadcast information services through multi-dimensional compensation such as variable rate, multi-carrier, and multi-path. It is suitable for various communication scenarios that prioritize communication reliability while taking into account communication efficiency.

[0005] The object of the present invention is achieved in that:

[0006] A reliable multi-station collaborative distribution method for complex multi-scenario satellite communications controls multiple broadcast stations in different locations to use different rates and different time slots through a control center, multiplexes a multi-rate TDMA broadcast carrier, and forms a broadcast network, thereby broadcasting and distributing to multiple receiving stations in different locations, including the following steps:

[0007] Step 1: The control center performs network planning according to the mission requirements and generates optional broadcast stations and network parameters. The network parameters include communication satellite resources, mission carrier parameters, frame structure, and initial time. The mission carrier parameters include the number of carriers, center frequency, carrier bandwidth, and transmission power. The frame structure includes frame length, unique code, and number of time slots.

[0008] Step 2: The control center interacts with the optional broadcast stations in turn to confirm whether the optional broadcast stations are available. If available, the control center issues network parameters until enough broadcast stations are selected.

[0009] Step 3: After receiving the network parameters sent by the control center, the broadcast station performs self-ranging on the mission carrier to determine the satellite signal loopback time of the station, and completes time synchronization in combination with Beidou time information, and then reports the status to the control center;

[0010] Step 4: After receiving the status report information from each broadcasting station, the control center performs frame plan calculation and generates a TDMA frame plan configuration file for each mission carrier, which includes the number, sequence, rate and corresponding broadcasting station of TDMA time slots; then, the control center sends the generated TDMA frame plan configuration file to the relevant broadcasting stations and organizes multiple broadcasting stations to execute the opening of one or more variable rate TDMA satellite broadcasting networks;

[0011] Step 5, after receiving the TDMA frame plan configuration file from the control center, the broadcast station sends data on the allocated time slot according to the TDMA frame plan configuration file for broadcast distribution;

[0012] Step 6, after the receiving station is powered on, parameters are manually added, and the mission carrier parameters are added to the receiving station. The receiving station is initialized according to the mission carrier parameters, and then the signal is captured at the minimum carrier rate of the mission carrier. After the signal is captured, the receiving carrier rate of the station is determined according to the receiving signal-to-noise ratio, and data is received at the receiving carrier rate of the mission carrier.

[0013] Furthermore, it also includes:

[0014] When performing broadcast distribution, the broadcast station reports the operating status information of the station to the control center. The control center monitors the status of each broadcast station in real time, makes on-demand adjustments to the running broadcast network, performs real-time monitoring and presents a comprehensive situation, and sends the adjusted TDMA frame plan configuration file to the broadcast station. The broadcast station re-distributes broadcasts based on the adjusted TDMA frame plan configuration file.

[0015] Furthermore, the communication rate adopted by each burst time slot of the task carrier is variable, and the communication rate is identified by the unique code information in the frame structure.

[0016] Furthermore, in step 3, the time synchronization method is:

[0017] The broadcast station sends a ranging signal to the Beidou satellite on the mission carrier, receives Beidou time information, measures the time difference between sending and receiving, and records it as the satellite signal loop time; the Beidou time information includes the second pulse and the detailed time of the current second pulse;

[0018] When the second pulse is received, the start time of the Nth frame is calculated based on the detailed time, frame length and initial time of the current second pulse. Half of the satellite signal loop time of this station is subtracted from the start time of the Nth frame, and the result is recorded as the start time of the Nth frame of this station. After the start time is confirmed, the time synchronization of the broadcasting station is achieved.

[0019] Furthermore, the topology of the broadcast network includes:

[0020] (1) Multiple broadcast stations use a single variable rate TDMA broadcast carrier to support one receiving station, forming a single carrier TDMA broadcast network with multiple master stations and multiple rates for a single receiving station. The receiving station receives information by selecting the best time slot in multiple communication rates in the carrier based on its real-time communication capability, thus balancing communication reliability and efficiency.

[0021] (2) Multiple broadcasting stations use more than two variable-rate TDMA broadcasting carriers to support one receiving station, forming a multi-carrier TDMA broadcasting network with multiple master stations and multiple rates for a single receiving station. The receiving station receives information by selecting the best time slots of multiple communication rates on multiple carriers based on its own real-time communication capabilities, thus balancing communication reliability and efficiency.

[0022] (3) Multiple broadcasting stations use a single variable rate TDMA broadcasting carrier to support multiple receiving stations, forming a single carrier TDMA broadcasting network with multiple master stations and multiple rates for multiple receiving stations. Different receiving stations independently receive information by selecting the best time slot in the carrier based on their own real-time communication capabilities, thus balancing communication reliability and efficiency.

[0023] (4) Multiple broadcasting stations use more than two variable-rate TDMA broadcasting carriers to support multiple receiving stations, forming a multi-carrier TDMA broadcasting network with multiple master stations and multiple rates for multiple receiving stations; multiple receiving stations independently receive information based on their own real-time communication capabilities by selecting the best time slots of multiple communication rates on multiple carriers, thereby balancing communication reliability and efficiency.

[0024] Complex multi-scenario satellite communication reliable multi-station collaborative distribution system, including a control center, multiple remote broadcast stations and multiple remote receiving stations. Under the control of the control center, the broadcast stations use different rates and different time slots to multiplex a multi-rate TDMA broadcast carrier to form a broadcast network;

[0025] The system works as follows:

[0026] The control center conducts network planning according to the mission requirements and generates optional broadcast stations and network parameters. The network parameters include communication satellite resources, mission carrier parameters, frame structure, and initial time. The mission carrier parameters include the number of carriers, center frequency, carrier bandwidth, and transmission power. The frame structure includes frame length, unique code, and number of time slots.

[0027] The control center interacts with the optional broadcast stations in turn to confirm whether the optional broadcast stations are available. If available, the control center sends down network parameters until enough broadcast stations are selected.

[0028] After receiving the network parameters sent by the control center, the broadcast station performs self-ranging on the mission carrier to determine the satellite signal loopback time of the station, and completes time synchronization in combination with Beidou time information, and then reports the status to the control center;

[0029] After receiving the status report information from each broadcasting station, the control center performs frame plan calculation and generates a TDMA frame plan configuration file for each mission carrier. The TDMA frame plan configuration file includes the number, sequence, rate and corresponding broadcasting station of TDMA time slots. Then, the control center sends the generated TDMA frame plan configuration file to the relevant broadcasting stations and organizes multiple broadcasting stations to execute the opening of one or more variable rate TDMA satellite broadcasting networks.

[0030] After receiving the TDMA frame plan configuration file from the control center, the broadcast station sends data on the allocated time slot according to the TDMA frame plan configuration file for broadcast distribution;

[0031] After the receiving station is powered on, parameters are manually added and the mission carrier parameters are added to the receiving station. The receiving station is initialized according to the mission carrier parameters and then captures the signal at the lowest carrier rate of the mission carrier. After capturing the signal, the receiving carrier rate of the station is determined based on the receiving signal-to-noise ratio, and data is received at the receiving carrier rate of the mission carrier.

[0032] Furthermore, when performing broadcast distribution, the radio station reports the operating status information of the station to the control center. The control center monitors the status of each radio station in real time, makes on-demand adjustments to the running broadcast network, performs real-time monitoring and comprehensive situation presentation, and sends the adjusted TDMA frame plan configuration file to the radio station. The radio station re-performs broadcast distribution according to the adjusted TDMA frame plan configuration file.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] 1. The present invention uses a variable-rate TDMA carrier to enable multiple broadcast stations to multiplex a multi-rate TDMA broadcast carrier using different rates and different time slots; the control center uniformly plans and real-time controls the allocation of system communication resources such as carrier frequency, carrier rate, working time slot, etc. of broadcast stations located in different locations, thereby realizing efficient collaborative operation of multiple broadcast stations in different locations.

[0035] 2. The present invention realizes the transformation from the traditional "single master station single rate single carrier star network" satellite broadcasting system to "multiple master stations multi-rate single carrier many-to-one", "multiple master stations multi-rate multi-carrier many-to-one", "multiple master stations multi-rate single carrier star network", "multiple master stations multi-rate multi-carrier star network" and other TDMA satellite broadcasting systems.

[0036] 3. The present invention can overcome the adverse effects of communication link deterioration caused by known and unknown reasons, and is suitable for various satellite broadcast communication application scenarios with high reliability requirements. It can give priority to ensuring communication reliability while taking into account communication efficiency, and achieve a dynamic balance between efficient reception at the optimal rate and reliable reception at the lowest rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the principles of a reliable multi-station collaborative distribution system for complex multi-scenario satellite communications in an embodiment of the present invention.

[0038] Figure 2 It is a schematic diagram of the broadcast network topology structure of different application scenarios in the embodiments of the present invention.

[0039] Figure 3 It is a schematic diagram of a variable rate TDMA frame structure in an embodiment of the present invention.

[0040] Figure 4 It is a flow chart of a reliable multi-station collaborative distribution method for complex multi-scenario satellite communications in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the accompanying drawings.

[0042] Reliable multi-station collaborative distribution system for complex multi-scenario satellite communications, such as Figure 1 As shown, the system includes a control center, multiple remote broadcast station systems, and multiple remote receiving stations. Under the control of the control center, the broadcast stations use different rates and different time slots to multiplex a multi-rate TDMA broadcast carrier to form a broadcast network, achieving high reliability and strong guarantee of satellite broadcast information services for remote user stations with different communication capabilities. Among them:

[0043] The control center is the network planning and control center. According to the use requirements, it will plan the unified network parameters of the mission broadcast network, send the parameters to each mission broadcast station and control the opening of the network, and conduct real-time control, status monitoring and comprehensive situation presentation of the running network and equipment. The network planning parameters include the broadcast station used, satellite transponders, number of carriers, carrier rate, carrier time slot, etc.

[0044] The broadcasting station includes multiple sites distributed in different locations. Under the unified organization of the control center, several broadcasting stations are multiplexed based on different rate carrier time slots to realize the variable rate TDMA carrier signal transmission of the system core.

[0045] The receiving station implements the reception of variable rate TDMA carrier signals.

[0046] Reliable multi-station collaborative distribution method for complex multi-scenario satellite communications, such as Figure 4 As shown, the following steps are included:

[0047] (1) The control center performs network planning based on the input usage requirements and generates optional broadcast stations and network planning parameters. The network planning parameters include communication satellite resources, mission carrier parameters, frame structure, and initial time. The mission carrier parameters include the number of carriers, center frequency, carrier bandwidth, and transmission power, and the frame structure includes frame length and number of time slots.

[0048] The communication rate used by each burst time slot of the task carrier does not have to be the same. The variable rate burst time slot frame realizes variable rate identification through the unique code information in the burst frame structure, such as Figure 3 shown.

[0049] (2) The control center interacts with the optional broadcast stations in turn to confirm whether the broadcast stations are available. If available, the control center issues network planning parameters until enough broadcast stations are selected.

[0050] (3) After receiving the network planning parameters, the broadcast station determines the satellite signal round-trip time (RTT) of the station through self-ranging on the mission carrier, and completes time synchronization in combination with Beidou time information. After completion, it reports the status to the control center;

[0051] The time synchronization is implemented as follows: the broadcast station sends a ranging signal on the mission carrier, receives it, measures the time difference between sending and receiving, and records it as the satellite signal loopback time; Beidou time information includes the second pulse and the detailed time of the current second pulse; when the second pulse is received, the start time of the Nth frame is calculated according to the detailed time, frame length and initial time of the current second pulse, and half of the satellite signal loopback time of the station is subtracted from the start time of the Nth frame, and recorded as the start time of the Nth frame of the station. After the start time is confirmed, the time synchronization of the station is completed;

[0052] (4) After receiving the status report information from each broadcasting station, the control center performs frame plan calculation and generates a TDMA frame plan configuration file for each mission carrier, including the number, sequence, rate and corresponding broadcasting station of TDMA time slots. After the calculation is completed, the control center sends the generated TDMA frame plan configuration file to the relevant broadcasting stations and organizes multiple broadcasting stations to execute the opening of one or more variable rate TDMA satellite broadcasting networks;

[0053] (5) After receiving the frame plan from the control center, the broadcast station sends data in the time slot allocated to the broadcast station according to the frame plan for broadcast distribution;

[0054] (6) After the user station is powered on, parameters are manually added, and the mission carrier information is added to the user station. The user station is initialized according to the added parameters, and then the signal is captured at the minimum carrier rate of the mission carrier. After the signal is captured, the receiving carrier rate of the station is determined according to the receiving signal-to-noise ratio, and data is received at the receiving carrier rate of the mission carrier.

[0055] (7) When broadcasting, the radio station reports the station's operating information and other status to the control center. The control center monitors the status of each radio station in real time, makes adjustments to the operating network as needed, monitors it in real time, and presents a comprehensive situation. The control center also sends the adjusted frame plan to the radio station, which then re-distributes the broadcast according to the adjusted frame plan.

[0056] The system supports TDMA broadcast networks with different topologies and is suitable for different application scenarios, such as Figure 2 As shown, including:

[0057] (1) Multiple broadcast stations use a single variable-rate TDMA broadcast carrier to protect one receiving station, forming a multi-(multiple master stations and multiple rates) to one (single receiving station) single-carrier TDMA broadcast network; the receiving station receives information by selecting the best time slot in multiple communication rates in the carrier based on its own real-time communication capabilities, thus balancing communication reliability and efficiency.

[0058] (2) Multiple broadcast stations use more than two variable-rate TDMA broadcast carriers to guarantee one receiving station, forming a multi-carrier TDMA broadcast network with multiple (multiple master stations and multiple rates) to one (single receiving station). The receiving station receives information by selecting the best time slot among multiple communication rates in multiple carriers based on its own real-time communication capabilities, thus further balancing communication reliability and efficiency.

[0059] (3) Multiple broadcast stations use a single variable-rate TDMA broadcast carrier to support multiple receiving stations, forming a multi-(multi-master station multi-rate) to multi-(multi-receiving station) single-carrier TDMA broadcast network; different receiving stations independently receive information based on their own real-time communication capabilities by selecting the best time slot in multiple communication rates in the carrier, thus balancing communication reliability and efficiency.

[0060] (4) Multiple broadcasting stations use more than two variable-rate TDMA broadcasting carriers to support multiple receiving stations, forming a multi-carrier TDMA broadcasting network with multiple (multiple master stations and multiple rates) to multiple (multiple receiving stations); multiple receiving stations independently receive information based on their own real-time communication capabilities by selecting the best time slot in multiple communication rates among multiple carriers, thereby further balancing communication reliability and efficiency.

[0061] The present invention is based on the Beidou unified time reference and combines the broadcast station ranging to achieve the purpose of time synchronization of multiple broadcast stations, realize the multi-path guarantee of multiple broadcast stations to a single user station, solve the system failure caused by faults, rain attenuation, etc. of the single broadcast station system, and effectively compensate for the reliability of the single broadcast station; through the variable rate TDMA frame structure design, multiple broadcast stations use different rates and different time slots to multiplex a variable rate TDMA carrier, effectively compensating for the difference in receiving capabilities of multiple user stations; through the unified planning of the control center, the simultaneous multiplexing of multiple TDMA carriers is realized to compensate for the system broadcast capacity.

[0062] The present invention realizes reliable data distribution of multiple broadcast stations with efficient collaboration through multi-dimensional compensation such as multi-path, variable rate, and multi-carrier, combined with unified planning and control of a control center. It can adapt to various complex application scenarios of multiple master stations, multi-rate single carrier, and multiple master stations, multi-rate and multi-carrier for a single receiving station, and is particularly suitable for broadcast distribution applications with high reliability requirements.

Claims

1. A reliable multi-station collaborative distribution method for complex multi-scenario satellite communications, characterized in that: The control center controls multiple broadcast stations in different places to use different rates and different time slots, multiplex a multi-rate TDMA broadcast carrier, and form a broadcast network, thereby broadcasting and distributing to multiple receiving stations in different places, including the following steps: Step 1: The control center performs network planning according to the mission requirements and generates optional broadcast stations and network parameters. The network parameters include communication satellite resources, mission carrier parameters, frame structure, and initial time. The mission carrier parameters include the number of carriers, center frequency, carrier bandwidth, and transmission power. The frame structure includes frame length, unique code, and number of time slots. Step 2: The control center interacts with the optional broadcasting stations in turn to confirm whether the optional broadcasting stations are available. If available, the control center sends down network parameters until multiple broadcasting stations are selected. Step 3: After receiving the network parameters sent by the control center, the broadcast station performs self-ranging on the mission carrier to determine the satellite signal loopback time of the station, and completes time synchronization in combination with Beidou time information, and then reports the status to the control center; the time synchronization method is: The broadcast station sends a ranging signal to the Beidou satellite on the mission carrier, receives Beidou time information, measures the time difference between sending and receiving, and records it as the satellite signal loop time; the Beidou time information includes the second pulse and the detailed time of the current second pulse; When receiving the second pulse, the start time of the Nth frame is calculated according to the detailed time, frame length and initial time of the current second pulse. Half of the satellite signal loop time of the station is subtracted from the start time of the Nth frame, and the result is recorded as the start time of the Nth frame of the station. After the start time is confirmed, the time synchronization of the broadcasting station is achieved. Step 4: After receiving the status report information from each broadcasting station, the control center performs frame plan calculation and generates a TDMA frame plan configuration file for each mission carrier, which includes the number, sequence, rate and corresponding broadcasting station of TDMA time slots; then, the control center sends the generated TDMA frame plan configuration file to the relevant broadcasting stations and organizes multiple broadcasting stations to execute the opening of one or more variable rate TDMA satellite broadcasting networks; Step 5, after receiving the TDMA frame plan configuration file from the control center, the broadcast station sends data on the allocated time slot according to the TDMA frame plan configuration file for broadcast distribution; Step 6: After the receiving station is powered on, the parameters are manually added, and the mission carrier parameters are added to the receiving station. The receiving station is initialized according to the mission carrier parameters, and then the signal is captured at the lowest carrier rate of the mission carrier. After the signal is captured, the receiving carrier rate of the station is determined according to the receiving signal-to-noise ratio, and data is received at the receiving carrier rate of the mission carrier. The topology of the broadcast network includes: (1) Multiple broadcast stations use a single variable rate TDMA broadcast carrier to support one receiving station, forming a single carrier TDMA broadcast network with multiple master stations and multiple rates for a single receiving station. The receiving station receives information by selecting the best time slot in multiple communication rates in the carrier based on its real-time communication capability, thus balancing communication reliability and efficiency. (2) Multiple broadcasting stations use more than two variable-rate TDMA broadcasting carriers to support one receiving station, forming a multi-carrier TDMA broadcasting network with multiple master stations and multiple rates for a single receiving station. The receiving station receives information by selecting the best time slots of multiple communication rates on multiple carriers based on its own real-time communication capabilities, thus balancing communication reliability and efficiency. (3) Multiple broadcasting stations use a single variable rate TDMA broadcasting carrier to support multiple receiving stations, forming a single carrier TDMA broadcasting network with multiple master stations and multiple rates for multiple receiving stations. Different receiving stations independently receive information by selecting the best time slot in the carrier based on their own real-time communication capabilities, thus balancing communication reliability and efficiency. (4) Multiple broadcasting stations use more than two variable-rate TDMA broadcasting carriers to support multiple receiving stations, forming a multi-carrier TDMA broadcasting network with multiple master stations and multiple rates for multiple receiving stations; multiple receiving stations independently receive information based on their own real-time communication capabilities by selecting the best time slots of multiple communication rates on multiple carriers, thereby balancing communication reliability and efficiency.

2. The complex multi-scenario satellite communication reliable multi-station coordinated distribution method according to claim 1 is characterized in that: Also includes: When performing broadcast distribution, the broadcast station reports the operating status information of the station to the control center. The control center monitors the status of each broadcast station in real time, makes on-demand adjustments to the running broadcast network, performs real-time monitoring and presents a comprehensive situation, and sends the adjusted TDMA frame plan configuration file to the broadcast station. The broadcast station re-distributes broadcasts based on the adjusted TDMA frame plan configuration file.

3. The complex multi-scenario satellite communication reliable multi-station coordinated distribution method according to claim 1 is characterized in that: The communication rate adopted by each burst time slot of the task carrier is variable, and the communication rate is identified by the unique code information in the frame structure.

4. A reliable multi-station collaborative distribution system for complex multi-scenario satellite communications, characterized by: It includes a control center, multiple remote broadcasting stations, and multiple remote receiving stations. Under the control of the control center, the broadcasting stations use different rates and different time slots to multiplex a multi-rate TDMA broadcast carrier to form a broadcast network. The topology of the broadcast network includes: (1) Multiple broadcast stations use a single variable rate TDMA broadcast carrier to support one receiving station, forming a single carrier TDMA broadcast network with multiple master stations and multiple rates for a single receiving station. The receiving station receives information by selecting the best time slot in multiple communication rates in the carrier based on its real-time communication capability, thus balancing communication reliability and efficiency. (2) Multiple broadcasting stations use more than two variable-rate TDMA broadcasting carriers to support one receiving station, forming a multi-carrier TDMA broadcasting network with multiple master stations and multiple rates for a single receiving station. The receiving station receives information by selecting the best time slots of multiple communication rates on multiple carriers based on its own real-time communication capabilities, thus balancing communication reliability and efficiency. (3) Multiple broadcasting stations use a single variable rate TDMA broadcasting carrier to support multiple receiving stations, forming a single carrier TDMA broadcasting network with multiple master stations and multiple rates for multiple receiving stations. Different receiving stations independently receive information by selecting the best time slot in the carrier based on their own real-time communication capabilities, thus balancing communication reliability and efficiency. (4) Multiple broadcasting stations use more than two variable-rate TDMA broadcasting carriers to support multiple receiving stations, forming a multi-carrier TDMA broadcasting network with multiple master stations and multiple rates for multiple receiving stations; multiple receiving stations independently receive information by selecting the best time slots of multiple communication rates of multiple carriers based on their own real-time communication capabilities, thus balancing communication reliability and efficiency; The system works as follows: The control center conducts network planning according to the mission requirements and generates optional broadcast stations and network parameters. The network parameters include communication satellite resources, mission carrier parameters, frame structure, and initial time. The mission carrier parameters include the number of carriers, center frequency, carrier bandwidth, and transmission power. The frame structure includes frame length, unique code, and number of time slots. The control center interacts with the optional broadcasting stations in turn to confirm whether the optional broadcasting stations are available. If available, the control center sends down the network parameters until multiple broadcasting stations are selected. After receiving the network parameters sent by the control center, the broadcast station performs self-ranging on the mission carrier to determine the satellite signal loopback time of the station, and completes time synchronization in combination with Beidou time information, and then reports the status to the control center; the time synchronization method is: The broadcast station sends a ranging signal to the Beidou satellite on the mission carrier, receives Beidou time information, measures the time difference between sending and receiving, and records it as the satellite signal loop time; the Beidou time information includes the second pulse and the detailed time of the current second pulse; When receiving the second pulse, the start time of the Nth frame is calculated according to the detailed time, frame length and initial time of the current second pulse. Half of the satellite signal loop time of the station is subtracted from the start time of the Nth frame, and the result is recorded as the start time of the Nth frame of the station. After the start time is confirmed, the time synchronization of the broadcasting station is achieved. After receiving the status report information from each broadcasting station, the control center performs frame plan calculation and generates a TDMA frame plan configuration file for each mission carrier. The TDMA frame plan configuration file includes the number, sequence, rate and corresponding broadcasting station of TDMA time slots. Then, the control center sends the generated TDMA frame plan configuration file to the relevant broadcasting stations and organizes multiple broadcasting stations to execute the opening of one or more variable rate TDMA satellite broadcasting networks. After receiving the TDMA frame plan configuration file from the control center, the broadcast station sends data on the allocated time slot according to the TDMA frame plan configuration file for broadcast distribution; After the receiving station is powered on, parameters are manually added and the mission carrier parameters are added to the receiving station. The receiving station is initialized according to the mission carrier parameters and then captures the signal at the lowest carrier rate of the mission carrier. After capturing the signal, the receiving carrier rate of the station is determined based on the receiving signal-to-noise ratio, and data is received at the receiving carrier rate of the mission carrier.

5. The complex multi-scenario satellite communication reliable multi-station collaborative distribution system according to claim 4 is characterized in that: When performing broadcast distribution, the broadcast station reports the operating status information of the station to the control center. The control center monitors the status of each broadcast station in real time, makes on-demand adjustments to the running broadcast network, performs real-time monitoring and presents a comprehensive situation, and sends the adjusted TDMA frame plan configuration file to the broadcast station. The broadcast station re-distributes broadcasts based on the adjusted TDMA frame plan configuration file.

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