Satellite anti-jamming communication architecture and method based on satellite-ground joint decision

Abstract

The application discloses a satellite anti-interference communication architecture and method based on satellite-ground joint decision, wherein the architecture comprises a satellite, a terminal and a terminal control station, and the method comprises a terminal uplink anti-interference switching method and a terminal downlink anti-interference switching method. The application fully utilizes the current available link resources without increasing the complexity of the terminal, and performs satellite-ground joint anti-interference decision and dynamically adjusts the link resources used by the terminal uplink and downlink according to the link spectrum sensing result and the link signal-to-noise ratio estimation result, so that the satellite anti-interference communication capability is improved under the premise of ensuring a high communication rate.

Description

Technical Field

[0001] This invention relates to a satellite anti-jamming communication architecture and method based on joint satellite-ground decision-making, belonging to the field of satellite communication. Background Technology

[0002] Due to the rapid development of satellite communications, communication frequency bands are becoming increasingly congested, and unintentional and intentional interference in communication links has increased significantly, limiting the reliability and speed of satellite communications. Typically, spread spectrum or frequency hopping communication technologies are used to reduce the impact of interference; however, indiscriminate spread spectrum and frequency hopping will lead to a significant reduction in communication speed, making high-speed communication difficult and severely impacting the performance of communication systems. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the existing technology and propose a satellite anti-jamming communication architecture and method based on joint satellite-ground decision-making, so as to improve the satellite anti-jamming communication capability while ensuring the communication rate.

[0004] The technical solution of the present invention is: a satellite anti-jamming communication architecture based on joint satellite-ground decision-making, comprising: a satellite, a terminal, and a terminal control station;

[0005] The satellite receives the downlink signal-to-noise ratio (SNR) estimate from the terminal and makes a preliminary decision on downlink interference immunity. Simultaneously, based on the calculated uplink SNR estimate and the uplink spectrum sensing results, it makes a preliminary decision on uplink interference immunity. If the decision indicates a need to change link parameters, the satellite sends a handover request to the terminal control station. Upon receiving confirmation of the link parameter handover from the terminal control station, the satellite pre-allocates uplink or downlink resources and sends this pre-allocation information to the terminal control station. The satellite then changes its link parameters based on the received confirmation of the link resource allocation from the terminal control station and sends the confirmation information back to the terminal.

[0006] The terminal control station receives the handover request information from the satellite, determines whether the link parameters can be switched based on the current terminal working status, and sends the result to the satellite. At the same time, the terminal control station receives the link resource pre-allocation information from the satellite, determines whether the link resources are available based on the known link resource occupancy status of the terminal control station, and sends the final confirmed link resource allocation information to the satellite.

[0007] The terminal completes the downlink signal-to-noise ratio estimation and sends the estimated value to the satellite via the uplink. At the same time, based on the link resource allocation confirmation information sent by the satellite, the terminal changes the link parameters and completes the anti-interference communication parameter switching of the terminal link.

[0008] The link parameters include communication frequency, time slot, data rate, channel coding, modulation scheme, and satellite beam.

[0009] The anti-interference pre-decision includes: determining whether it is necessary to reduce the impact of interference by changing the link parameters based on the current link signal-to-noise ratio estimate, spectrum sensing results, and the signal-to-noise ratio threshold and bandwidth information corresponding to the link parameters, so as to ensure link reliability.

[0010] The aforementioned link resource pre-allocation includes: using current terminal service requirements, link resource occupancy status, and spectrum sensing results as inputs, and employing artificial intelligence algorithms to complete the optimal allocation of link resources to ensure the smooth operation of terminal services.

[0011] The satellite includes a network control processor, a communication processor, an electromagnetic sensing processor, a terminal transceiver channel, a terminal antenna, a terminal control station transceiver channel, and a terminal control station antenna;

[0012] The network control processor receives the estimated downlink signal-to-noise ratio (SNR) and uplink SNR of the terminal from the communication processor, and receives the spectrum sensing results from the electromagnetic sensing processor to complete the anti-interference pre-decision for the terminal's uplink and downlink. When it is necessary to change the link parameters, it sends a handover request to the communication processor. After receiving the consent to switch the link parameters from the communication processor, it performs pre-allocation of uplink and downlink resources for the terminal and sends the pre-allocation information to the terminal control station. Finally, it receives the link resource allocation confirmation information from the terminal control station.

[0013] The communication processor receives signals from the terminal and the terminal control station, and after demodulation, decoding, format conversion, and data exchange, sends the estimated downlink signal-to-noise ratio (SNR) and the estimated uplink SNR of the terminal to the network control processor. The communication processor receives the handover request information from the network control processor and provides feedback on whether to agree to the link parameter handover based on the actual situation. At the same time, the communication processor receives the link resource allocation confirmation information from the network control processor and changes the link parameters of the communication processor.

[0014] The electromagnetic sensing processor completes the electromagnetic spectrum monitoring and parameter estimation of the terminal's uplink signal, and sends the spectrum sensing results to the network control processor;

[0015] The terminal transceiver channel and terminal antenna complete up-conversion, filtering, and amplification of the bidirectional link between the terminal and the network controller, and receive link resource allocation confirmation information from the network controller to change the link parameters of the terminal transceiver channel and terminal antenna.

[0016] The terminal control station's transceiver channel and antenna complete the up-and-down conversion, filtering, and amplification of the bidirectional link between the terminal control station and the transceiver.

[0017] A satellite anti-jamming communication method based on satellite-ground joint decision-making using the aforementioned satellite anti-jamming communication architecture includes a terminal uplink anti-jamming switching method and a terminal downlink anti-jamming switching method.

[0018] The terminal uplink anti-interference handover method includes:

[0019] After the terminal and terminal control station have completed access, the electromagnetic sensing processor continuously monitors the spectrum within the available bandwidth of the entire terminal uplink and sends the monitored spectrum sensing results to the network control processor; the communication processor demodulates and decodes the terminal uplink signal and sends the current signal-to-noise ratio estimate of the terminal uplink to the network control processor.

[0020] The network control processor completes anti-interference pre-decision based on the spectrum sensing results and the estimated uplink signal-to-noise ratio of the terminal. If no change in link parameters is required, no processing is performed. If necessary, the network control processor sends a handover request to the communication processor, which encodes and modulates the information and sends it to the terminal control station for judgment through the terminal control station transceiver channel and the terminal control station antenna.

[0021] The link parameter switching confirmation information sent by the terminal control station is demodulated and decoded by the communication processor after passing through the terminal control station antenna and the terminal control station transceiver channel, and then sent to the network control processor. If the link parameter switching is not agreed, no processing is performed. If the link parameter switching is agreed, the network control processor performs uplink resource pre-allocation for the terminal and sends the link resource pre-allocation information to the terminal control station through the communication processor.

[0022] After receiving the link resource pre-allocation information from the network controller, the terminal control station determines whether the link resources are available based on the currently known link resource occupancy status, and after determining the correspondence between the link resources and the terminals, sends the final link resource allocation confirmation information to the network controller.

[0023] After receiving the link resource allocation confirmation information from the terminal control station, the network controller processor sends it to the communication processor, the terminal transceiver channel, the terminal antenna, and the terminal to change the link parameters.

[0024] The terminal downlink anti-interference handover method:

[0025] After both the terminal and the terminal control station have completed access, the communication processor demodulates and decodes the uplink signal of the terminal and sends the estimated signal-to-noise ratio of the downlink of the terminal to the network control processor.

[0026] The network controller processor completes anti-interference pre-decision based on the estimated downlink signal-to-noise ratio of the terminal. If the link parameters do not need to be changed, no processing is performed. If necessary, the network controller processor sends a handover request to the communication processor, which encodes and modulates the information and sends it to the terminal control station for judgment through the terminal control station transceiver channel and the terminal control station antenna.

[0027] The link parameter switching confirmation information sent by the terminal control station is demodulated and decoded by the communication processor after passing through the terminal control station antenna and the terminal control station transceiver channel, and then sent to the network control processor. If the link parameter switching is not agreed, no processing is performed. If the link parameter switching is agreed, the network control processor performs uplink resource pre-allocation for the terminal and sends the link resource pre-allocation information to the terminal control station through the communication processor.

[0028] After receiving the link resource pre-allocation information from the network controller, the terminal control station determines whether the link resources are available based on the currently known link resource occupancy status, and after determining the correspondence between the link resources and the terminals, sends the final link resource allocation confirmation information to the network controller.

[0029] After receiving the link resource allocation confirmation information from the terminal control station, the network controller processor sends it to the communication processor, the terminal transceiver channel, the terminal antenna, and the terminal to change the link parameters.

[0030] The link parameters include communication frequency, time slot, data rate, channel coding, modulation scheme, and satellite beam.

[0031] The anti-interference pre-decision includes: determining whether it is necessary to reduce the impact of interference by changing the link parameters based on the current link signal-to-noise ratio estimate, spectrum sensing results, and the signal-to-noise ratio threshold and bandwidth information corresponding to the link parameters, so as to ensure link reliability.

[0032] The advantages of this invention compared to existing technologies are as follows: This invention designs a satellite anti-jamming communication architecture and method based on joint satellite-ground decision-making. Without increasing the complexity of terminal implementation, it makes full use of currently available link resources. Based on the link spectrum sensing results and link signal-to-noise ratio results, satellite and ground jointly make anti-jamming decisions and dynamically adjust the link resources used by the communication link, thereby improving the satellite anti-jamming communication capability and reducing the use of traditional anti-jamming communication technologies such as spread spectrum and frequency hopping to a certain extent, thus ensuring a high anti-jamming communication rate. Attached Figure Description

[0033] Figure 1 This is a basic flowchart of a satellite anti-jamming communication architecture based on joint satellite-ground decision-making.

[0034] Figure 2This is a block diagram of a satellite anti-jamming communication architecture based on joint satellite-ground decision-making.

[0035] Figure 3 A flowchart of the terminal uplink anti-interference handover process;

[0036] Figure 4 A flowchart of the terminal downlink anti-interference handover process. Detailed Implementation

[0037] This invention discloses a satellite anti-jamming communication architecture based on joint satellite-ground decision-making, comprising: a satellite, a terminal, and a terminal control station.

[0038] The terminal completes bidirectional communication with the terminal control station through a two-way transmit and receive link with the satellite, thereby enabling the terminal control station to remotely control multiple terminals in the forward direction, as well as the multiple terminals to transmit data back to the terminal control station in the return direction.

[0039] The satellite includes: a network control processor, a communication processor, an electromagnetic sensing processor, a terminal transceiver channel, a terminal antenna, a terminal control station transceiver channel, and a terminal control station antenna.

[0040] The network control processor receives the estimated downlink signal-to-noise ratio (SNR) and uplink SNR of the terminal from the communication processor, and receives the spectrum sensing results from the electromagnetic sensing processor to complete the anti-interference pre-decision for the terminal's uplink and downlink. When it is necessary to change the link parameters, it sends a handover request to the communication processor. After receiving the consent to switch the link parameters from the communication processor, it performs pre-allocation of uplink and downlink resources for the terminal and sends the pre-allocation information to the terminal control station. Finally, it receives the link resource allocation confirmation information from the terminal control station.

[0041] The communication processor receives signals from the terminal and the terminal control station, and after demodulation, decoding, format conversion, and data exchange, sends the estimated downlink signal-to-noise ratio (SNR) and the estimated uplink SNR of the terminal to the network control processor. The communication processor receives the handover request information from the network control processor and provides feedback on whether to agree to the link parameter handover based on the actual situation. At the same time, the communication processor receives the link resource allocation confirmation information from the network control processor and changes the link parameters of the communication processor.

[0042] The electromagnetic sensing processor completes the electromagnetic spectrum monitoring and parameter estimation of the terminal's uplink signal, and sends the spectrum sensing results to the network control processor;

[0043] The terminal transceiver channel and terminal antenna complete up-conversion, filtering, and amplification of the bidirectional link between the terminal and the network controller, and receive link resource allocation confirmation information from the network controller to change the link parameters of the terminal transceiver channel and terminal antenna.

[0044] The terminal control station's transceiver channel and antenna complete the up-and-down conversion, filtering, and amplification of the bidirectional link between the terminal control station and the transceiver.

[0045] The terminal control station receives the handover request information from the satellite, and determines whether the link parameters can be switched based on the current terminal working status, such as the terminal's service type, service priority, and communication duration, and sends the result to the satellite. The terminal control station also receives the link resource pre-allocation information from the satellite, and determines whether the link resources are available based on the known link resource occupancy status of the terminal control station, and sends the link resource allocation confirmation information to the satellite.

[0046] The terminal completes the signal-to-noise ratio estimation of the terminal downlink and sends the estimation result to the satellite through the terminal uplink; based on the link resource allocation confirmation information sent by the satellite, the terminal changes the current link parameters, thereby completing the anti-interference communication parameter switching of the terminal link.

[0047] The basic process of this invention is as follows: Figure 1 The connection relationships of each device are shown in the figure. Figure 2 The system can support simultaneous communication between multiple terminals and multiple terminal control stations, and a single terminal control station can also communicate with multiple terminals simultaneously.

[0048] like Figure 3 and Figure 4 These are the terminal uplink anti-interference handover procedures and the terminal downlink anti-interference handover procedures described in this invention. The following description uses an example of a system with one terminal control station and multiple terminals to illustrate the specific handover procedures.

[0049] Terminal uplink anti-interference handover process:

[0050] (1) After both the terminal and the terminal control station have completed access, the electromagnetic sensing processor continuously monitors the spectrum within the available bandwidth of the entire terminal uplink and sends the spectrum sensing results to the network control processor. After demodulating the uplink signals of N terminals, the communication processor sends the estimated signal-to-noise ratio of the current N terminal uplinks to the network control processor;

[0051] (2) The network controller processor makes anti-interference pre-decision based on the spectrum sensing results (generally referring to the power values ​​of each frequency point, and further including possible interference signal types and bandwidth, etc.), the estimated uplink signal-to-noise ratio of N terminals, the signal-to-noise ratio threshold and bandwidth corresponding to the current N link communication parameters, etc.

[0052] (3) If the anti-interference pre-decision conclusion is that no link parameters need to be changed, no processing is required; if the conclusion is that M terminal link parameters need to be changed (where 1≤M≤N), the network controller sends a handover request frame 1 to the terminal control station to ask whether it agrees to perform the link parameter handover.

[0053] (4) After receiving the handover request frame 1, the terminal control station determines whether to agree to the handover based on the working status of the terminal control station and the M terminals, and sends the result to the network control processor through the handover confirmation frame 1, which states that it agrees to the handover of K links (where 0≤K≤M).

[0054] (5) After receiving the handover confirmation frame 1, if K = 0, no processing is performed; otherwise, based on the current available link resources and the uplink rate requirements of the terminals, K uplink link resources for the terminals are reallocated and sent to the terminal control station through the link resource pre-allocation frame 1.

[0055] (6) After receiving the link resource pre-allocation frame 1, the terminal control station binds the uplink resources of K terminals to the K terminals and sends the correspondence between the link resources and the terminals to the network control processor through the link confirmation frame 1.

[0056] (7) After receiving the link confirmation frame 1, the network controller processor clarifies the correspondence between the K link resources and the K terminals, and accordingly changes the link parameters of the communication processor, terminal transceiver channel and terminal antenna, and sends the link resource allocation frame 1 to the K terminals.

[0057] (8) After receiving the link resource allocation frame 1, each of the K terminals modifies the corresponding terminal link parameters according to the content therein, thereby completing the anti-interference communication parameter switching of the uplink of the K terminals.

[0058] Terminal downlink anti-interference handover process:

[0059] (1) After the terminal and the terminal control station have completed access, N terminals demodulate and decode the received terminal downlink signals respectively, and send the estimated signal-to-noise ratio of the terminal downlink to the network control processor through the terminal status frame respectively.

[0060] (2) The network controller processor makes anti-interference pre-decision based on the estimated downlink signal-to-noise ratio of N terminals, the signal-to-noise ratio threshold and bandwidth corresponding to the current N link communication parameters;

[0061] (3) If the anti-interference pre-decision conclusion is that no link parameters need to be changed, no processing is required; if the conclusion is that the communication parameters of M terminal links need to be changed (where 1≤M≤N), the network controller sends a switching request frame 2 to the terminal control station to ask whether it agrees to switch the link parameters.

[0062] (4) After receiving the handover request frame 2, the terminal control station determines whether to agree to the handover based on the working status of each of the M terminals, and sends the result to the network control processor through the handover confirmation frame 2, which states that it agrees to the handover of K links (where 0≤K≤M).

[0063] (5) After receiving the handover confirmation frame 2, if K=0, the network controller processor does not perform any processing; otherwise, it reallocates K terminal downlink resources according to the current available link resources and sends them to the terminal control station through the link resource pre-allocation frame 2.

[0064] (6) After receiving the link resource pre-allocation frame 2, the terminal control station binds the downlink resources of K terminals to K terminals and sends the correspondence between the link resources and the terminals to the network control processor through the link confirmation frame 2.

[0065] (7) After receiving the link confirmation frame 2, the network controller processor clarifies the correspondence between the K link resources and the K terminals, and accordingly changes the communication parameters of the communication processor, terminal transceiver channel and terminal antenna, and sends the link resource allocation frame 2 to the K terminals.

[0066] (8) After receiving the link resource allocation frame 2, each of the K terminals modifies the corresponding terminal link parameters according to the content therein, thereby completing the anti-interference communication parameter switching of the downlink of the K terminals.

[0067] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make possible variations and modifications to the technical solutions of the present invention based on the disclosed technical content without departing from the spirit and scope of the invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A satellite anti-jamming communication architecture based on joint satellite-ground decision-making, characterized in that, include: Satellite, terminal, terminal control station; The downlink signal-to-noise ratio (SNR) estimate sent by the satellite receiving terminal is used to complete the terminal downlink anti-interference pre-decision. At the same time, based on the received uplink SNR estimate and the spectrum sensing results of the terminal uplink, the terminal uplink anti-interference pre-decision is also completed. If the decision indicates that the link parameters need to be changed, the satellite sends a handover request to the terminal control station. After receiving the consent link parameter switching information from the terminal control station, the satellite pre-allocates uplink or downlink link resources for the terminal and sends the link resource pre-allocation information to the terminal control station. The satellite changes its link parameters based on the link resource allocation confirmation information received from the terminal control station, and then sends the link resource allocation confirmation information back to the terminal. The terminal control station receives the handover request information from the satellite, determines whether the link parameters can be switched based on the current terminal working status, and sends the result to the satellite. At the same time, the terminal control station receives the link resource pre-allocation information from the satellite, determines whether the link resources are available based on the known link resource occupancy status of the terminal control station, and sends the final confirmed link resource allocation information to the satellite. The terminal completes the downlink signal-to-noise ratio estimation and sends the estimated value to the satellite via the uplink. At the same time, based on the link resource allocation confirmation information sent by the satellite, the terminal link parameters are changed to complete the anti-interference communication parameter switching of the terminal link. The aforementioned link resource pre-allocation includes: using reinforcement learning algorithms to optimize the allocation of link resources based on current terminal service requirements, link resource occupancy, and spectrum sensing results, thereby ensuring the smooth operation of terminal services; when making terminal downlink anti-interference pre-decision, spectrum sensing results are not considered. The satellite includes a network control processor, a communication processor, an electromagnetic sensing processor, a terminal transceiver channel, a terminal antenna, a terminal control station transceiver channel, and a terminal control station antenna; The network control processor receives the estimated downlink signal-to-noise ratio (SNR) and uplink SNR of the terminal from the communication processor, and receives the spectrum sensing results from the electromagnetic sensing processor to complete the anti-interference pre-decision for the terminal's uplink and downlink. When it is necessary to change the link parameters, it sends a handover request to the communication processor. After receiving the consent to switch the link parameters from the communication processor, it performs pre-allocation of uplink and downlink resources for the terminal and sends the pre-allocation information to the terminal control station. Finally, it receives the link resource allocation confirmation information from the terminal control station. The communication processor receives signals from the terminal and the terminal control station, and after demodulation, decoding, format conversion, and data exchange, sends the estimated downlink signal-to-noise ratio (SNR) and the estimated uplink SNR of the terminal to the network control processor. The communication processor receives the handover request information from the network control processor and provides feedback on whether to agree to the link parameter handover based on the actual situation. At the same time, the communication processor receives the link resource allocation confirmation information from the network control processor and changes the link parameters of the communication processor. The electromagnetic sensing processor completes the electromagnetic spectrum monitoring and parameter estimation of the terminal's uplink signal, and sends the spectrum sensing results to the network control processor; The terminal transceiver channel and terminal antenna complete up-conversion, filtering, and amplification of the bidirectional link between the terminal and the network controller, and receive link resource allocation confirmation information from the network controller to change the link parameters of the terminal transceiver channel and terminal antenna. The terminal control station's transceiver channel and antenna complete the up-and-down conversion, filtering, and amplification of the bidirectional link between the terminal control station and the transceiver.

2. The satellite anti-jamming communication architecture based on joint satellite-ground decision-making according to claim 1, characterized in that, The link parameters include communication frequency, time slot, data rate, channel coding, modulation scheme, and satellite beam.

3. The satellite anti-jamming communication architecture based on joint satellite-ground decision-making according to claim 1, characterized in that, The anti-interference pre-decision includes: determining whether it is necessary to reduce the impact of interference by changing the link parameters based on the current link signal-to-noise ratio estimate, spectrum sensing results, and the corresponding signal-to-noise ratio threshold and bandwidth information of the link parameters, so as to ensure link reliability; when making anti-interference pre-decision for the terminal downlink, the spectrum sensing results are not considered.

4. A satellite anti-jamming communication method based on joint satellite-ground decision-making using the satellite anti-jamming communication architecture described in claim 1, characterized in that, This includes the terminal uplink anti-interference handover method and the terminal downlink anti-interference handover method; The network control processor completes anti-interference pre-decision based on the spectrum sensing results and the estimated uplink signal-to-noise ratio of the terminal. If no change in link parameters is required, no processing is performed. If necessary, the network control processor sends a handover request to the communication processor, which encodes and modulates the information and sends it to the terminal control station for judgment through the terminal control station transceiver channel and the terminal control station antenna. The link parameter switching confirmation information sent by the terminal control station is demodulated and decoded by the communication processor after passing through the terminal control station antenna and the terminal control station transceiver channel, and then sent to the network control processor. If the link parameter switching is not agreed, no processing is performed. If the link parameter switching is agreed, the network control processor performs uplink resource pre-allocation for the terminal and sends the link resource pre-allocation information to the terminal control station through the communication processor. After receiving the link resource pre-allocation information from the network controller, the terminal control station determines whether the link resources are available based on the currently known link resource occupancy status, and after determining the correspondence between the link resources and the terminals, sends the final link resource allocation confirmation information to the network controller. After receiving the link resource allocation confirmation information from the terminal control station, the network controller processor sends it to the communication processor, the terminal transceiver channel, the terminal antenna, and the terminal to change the link parameters. The network controller processor completes anti-interference pre-decision based on the estimated downlink signal-to-noise ratio of the terminal. If the link parameters do not need to be changed, no processing is performed. If necessary, the network controller processor sends a handover request to the communication processor, which encodes and modulates the information and sends it to the terminal control station for judgment through the terminal control station transceiver channel and the terminal control station antenna. The link parameter switching confirmation information sent by the terminal control station is demodulated and decoded by the communication processor after passing through the terminal control station antenna and the terminal control station transceiver channel, and then sent to the network control processor. If the link parameter switching is not agreed, no processing is performed. If the link parameter switching is agreed, the network control processor performs uplink resource pre-allocation for the terminal and sends the link resource pre-allocation information to the terminal control station through the communication processor. After receiving the link resource pre-allocation information from the network controller, the terminal control station determines whether the link resources are available based on the currently known link resource occupancy status, and after determining the correspondence between the link resources and the terminals, sends the final link resource allocation confirmation information to the network controller. After receiving the link resource allocation confirmation information from the terminal control station, the network controller processor sends it to the communication processor, the terminal transceiver channel, the terminal antenna, and the terminal to change the link parameters.

5. The method according to claim 4, characterized in that, The terminal uplink anti-interference handover method includes: After both the terminal and the terminal control station have completed access, the electromagnetic sensing processor continuously monitors the spectrum within the available bandwidth of the entire terminal uplink and sends the monitored spectrum sensing results to the network control processor; the communication processor demodulates and decodes the terminal uplink signal and sends the current signal-to-noise ratio estimate of the terminal uplink to the network control processor.

6. The method according to claim 4, characterized in that, The terminal downlink anti-interference handover method: After both the terminal and the terminal control station have completed access, the communication processor demodulates and decodes the uplink signal of the terminal, and sends the estimated signal-to-noise ratio of the downlink of the terminal to the network control processor.

7. The method according to claim 4, characterized in that, The link parameters include communication frequency, time slot, data rate, channel coding, modulation scheme, and satellite beam.

8. The method according to claim 4, characterized in that, The anti-interference pre-decision includes: determining whether it is necessary to reduce the impact of interference by changing the link parameters based on the current link signal-to-noise ratio estimate, spectrum sensing results, and the corresponding signal-to-noise ratio threshold and bandwidth information of the link parameters, so as to ensure link reliability; when making anti-interference pre-decision for the terminal downlink, the spectrum sensing results are not considered.

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