A simulation method and system for establishing a working link of a remote sensing satellite system

Abstract

The present invention discloses a simulation method and system for establishing a working link of a remote sensing satellite system. The method includes: determining the visible links and visible durations between each remote sensing satellite and each earth station; taking the orbital epoch moment as the initial time node, and selecting the visible link with the longest visible duration at the initial time node in each visible link to establish a working link; recombining the remote sensing satellites and earth stations in other visible links to establish working links; determining the working link with the shortest visible duration among all working links at the initial time node, and taking the end moment of the visible duration of this working link as the judgment time node; judging the status of each earth station at the judgment time node; and establishing the final working link according to the earth station status. The present invention can realize the behavior simulation of establishing a working link for a multi-satellite and multi-station remote sensing satellite system, and improve the resource optimization configuration level and utilization efficiency of the remote sensing constellation system.

Description

Technical Field

[0001] The present invention relates to the technical field of remote sensing satellites. Specifically, it relates to a simulation method and system for establishing a working link of a remote sensing satellite system. Background Art

[0002] In recent years, more and more remote sensing satellite systems adopt constellation configuration designs and use multiple ground receiving stations to work together to improve the system's observation capabilities and data transmission efficiency. For the planning and design of remote sensing satellite systems, it is necessary to conduct simulation analysis on the service link connection capabilities, efficiency, and effects of remote sensing satellites, so as to predict and optimize the design of their future on-orbit working effects. In this analysis process, it is necessary to simulate the behaviors and effects of establishing the space-ground link of remote sensing satellites.

[0003] The space-ground link establishment relationship of a multi-satellite and multi-station remote sensing system is complex. That is, when a ground receiving station on a certain ground can simultaneously see multiple remote sensing satellites, which one of them to select to establish a communication link; on the other hand, when a remote sensing satellite passes by and can simultaneously see multiple ground stations, which station to select to establish a communication link; when the situations of one station with multiple satellites and one satellite with multiple stations occur simultaneously, whether to select a station by a satellite or select a satellite by a station. The establishment and simulation implementation of these strategies are of great significance for the overall resource allocation and normal performance of the remote sensing satellites.

[0004] At present, there is no unified method in China for establishing an effective working link for multi-satellite and multi-station remote sensing satellites, which often causes problems such as waste of ground resources and inefficient downlink of satellite data. Summary of the Invention

[0005] In view of the problems in the related art, the present invention proposes a simulation method and system for establishing a working link of a remote sensing satellite system, which can realize the behavior simulation of establishing a working link for a multi-satellite and multi-station remote sensing satellite system, and improve the resource optimization configuration level and usage efficiency of the remote sensing constellation system.

[0006] The technical solution of the present invention is realized as follows:

[0007] According to one aspect of the present invention, a simulation method for establishing a working link of a remote sensing satellite system is provided, wherein the remote sensing satellite system has multiple remote sensing satellites and multiple earth stations.

[0008] The simulation method for establishing a working link of the remote sensing satellite system includes:

[0009] Determine the visible links between each remote sensing satellite and each earth station; and determine the visible durations of the respective visible links;

[0010] Taking the orbital epoch moment of the remote sensing satellite system as the initial time node, select the visual link with the longest visible duration under the initial time node in each visible link to establish a working link; and recombine the remote sensing satellites and earth stations in other visible links to establish a working link;

[0011] Analyze all the working links to determine the working link with the shortest visible duration among all the working links under the initial time node, and obtain the end moment of the visible duration of this working link, and use this end moment as the judgment time node;

[0012] Judge the status of each earth station at the judgment time node; and establish the final working link according to the judged status of the earth station.

[0013] Further, determining the visual link between each remote sensing satellite and each earth station includes: analyzing the remote sensing satellite system to determine the initial phase parameters of each remote sensing satellite in the remote sensing satellite system; according to the initial phase parameters of each remote sensing satellite, determine the spatial position of each remote sensing satellite, and according to this spatial position, determine the visual link between the remote sensing satellite and the earth station.

[0014] In addition, the simulation method for establishing the working link of the remote sensing satellite system further includes: continuously judging the working link with the shortest visible duration among all the working links under the initial time node before the end of the simulation time, and updating the end moment of the visible duration of this working link as the judgment time node.

[0015] Further, the status of the earth station includes:

[0016] At the judgment time node, the visible duration of the working link of the earth station has not ended;

[0017] At the judgment time node, the visible duration of the working link of the earth station has ended;

[0018] At the judgment time node, the earth station is in an idle state.

[0019] Further, establishing the final working link according to the judged status of the earth station includes:

[0020] If the status of the earth station is that at the judgment time node, the visible duration of the working link of the earth station has not ended, then keep the existing working link;

[0021] If the status of the earth station is that at the judgment time node, the visible duration of the working link of the earth station has ended, then release the working link, and select the remote sensing satellite with the longest visible duration among the currently visible remote sensing satellites to establish a new working link;

[0022] When the status of the earth station is that the earth station is in an idle state at the judgment time node, it is judged whether there is a remote sensing satellite with a visible link, and if the judgment result is that there is a remote sensing satellite with a visible link, the visible link with the longest visible duration is selected to establish a working link.

[0023] According to another aspect of the present invention, there is provided a simulation system for establishing a working link of a remote sensing satellite system, wherein the remote sensing satellite system has a plurality of remote sensing satellites and a plurality of earth stations.

[0024] The simulation system for establishing a working link of the remote sensing satellite system includes:

[0025] A visible time determination module, configured to determine the visible link between each remote sensing satellite and each earth station; and determine the visible duration of each visible link;

[0026] An initial link establishment module, configured to use the orbital epoch moment of the remote sensing satellite system as the initial time node, select the visible link with the longest visible duration at the initial time node among each visible link to establish a working link; and recombine the remote sensing satellites and earth stations in other visible links to establish a working link;

[0027] A judgment time node determination module, configured to analyze all working links, determine the working link with the shortest visible duration among all working links at the initial time node, and obtain the end moment of the visible duration of this working link, and use this end moment as the judgment time node;

[0028] A final link establishment module, configured to judge the status of each earth station at the judgment time node; and establish a final working link according to the judged status of the earth station.

[0029] Further, when the visible time determination module determines the visible link between each remote sensing satellite and each earth station, it analyzes the remote sensing satellite system to determine the initial phase parameter of each remote sensing satellite in the remote sensing satellite system; and according to the initial phase parameter of each remote sensing satellite, determines the spatial position of each remote sensing satellite, and then according to this spatial position, determines the visible link between the remote sensing satellite and the earth station.

[0030] Further, the judgment time node determination module is further configured to continuously judge the working link with the shortest visible duration among all working links at the initial time node before the end of the simulation time, and update the end moment of the visible duration of this working link as the judgment time node.

[0031] Further, the status of the earth station includes:

[0032] At the judgment time node, the visible duration of the working link of the earth station has not ended;

[0033] At the time of judging the time node, the visible duration of the working link of the earth station has ended;

[0034] At the time of judging the time node, the earth station is in an idle state.

[0035] Furthermore, when the final link establishment module establishes the final working link according to the judged status of the earth station, it includes:

[0036] If the status of the earth station is that at the time of judging the time node, the visible duration of the working link of the earth station has not ended, then keep the existing working link;

[0037] If the status of the earth station is that at the time of judging the time node, the visible duration of the working link of the earth station has ended, then release the working link, and among the currently visible remote sensing satellites, select the remote sensing satellite with the longest visible duration to establish a new working link;

[0038] If the status of the earth station is that at the time of judging the time node, the earth station is in an idle state, then judge whether there are remote sensing satellites with visible links, and in the case that the judgment result is that there are remote sensing satellites with visible links, select the visible link with the longest visible duration to establish a working link.

[0039] Beneficial effects: Compared with the traditional link simulation method for multi-satellite multi-station remote sensing satellite systems, that is, analyzing the links between each satellite and a designated earth station independently, the present invention can realize the behavior simulation of establishing working links in a multi-satellite multi-station remote sensing satellite system, improve the resource optimization configuration level and usage efficiency of the remote sensing constellation system, and more reflect the actual working mode and working state of the remote sensing satellite system. Therefore, the obtained simulation results and analysis conclusions are statistically closer to the actual state level of the functional indicators of the remote sensing satellite system. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 is a schematic flowchart of a simulation method for establishing a working link of a remote sensing satellite system according to an embodiment of the present invention;

[0042] Figure 2 is a structural block diagram of a simulation system for establishing a working link of a remote sensing satellite system according to an embodiment of the present invention. Detailed Embodiments

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0044] According to an embodiment of the present invention, a simulation method and system for establishing a working link of a remote sensing satellite system are provided, wherein the remote sensing satellite system has a plurality of remote sensing satellites and a plurality of earth stations.

[0045] As Figure 1 shown, the simulation method for establishing a working link of a remote sensing satellite system according to an embodiment of the present invention includes:

[0046] Step S101, determining the visible links between each remote sensing satellite and each earth station; and determining the visible duration of each visible link;

[0047] Step S103, taking the orbital epoch moment of the remote sensing satellite system as the initial time node, selecting the visible link with the longest visible duration at the initial time node among the visible links to establish a working link; and recombining the remote sensing satellites and earth stations in other visible links to establish working links;

[0048] Step S105, analyzing all the working links, determining the working link with the shortest visible duration among all the working links at the initial time node, and obtaining the end moment of the visible duration of this working link, and using this end moment as the judgment time node;

[0049] Step S107, judging the status of each earth station at the judgment time node; and establishing the final working link according to the judged status of the earth station.

[0050] As Figure 2 shown, the simulation system for establishing a working link of a remote sensing satellite system according to an embodiment of the present invention includes:

[0051] A visible time determination module 201, configured to determine the visible links between each remote sensing satellite and each earth station; and determine the visible duration of each visible link;

[0052] An initial link establishment module 203, configured to take the orbital epoch moment of the remote sensing satellite system as the initial time node, select the visible link with the longest visible duration at the initial time node among the visible links to establish a working link; and recombining the remote sensing satellites and earth stations in other visible links to establish working links;

[0053] The determination module 205 for judgment time nodes is configured to analyze all working links, determine the working link with the shortest visible duration among all working links at the initial time node, and obtain the end time of the visible duration of this working link, and use this end time as the judgment time node;

[0054] The final link establishment module 207 is configured to judge the status of each earth station at the judgment time node; and establish the final working link according to the judged status of the earth station.

[0055] In specific applications, when determining the visible link between each remote sensing satellite and each earth station, the remote sensing satellite system can be analyzed to determine the initial phase parameters of each remote sensing satellite in the remote sensing satellite system; and according to the initial phase parameters of each remote sensing satellite, determine the spatial position of each remote sensing satellite, and then according to this spatial position, determine the visible link between the remote sensing satellite and the earth station.

[0056] For the status of the earth station, it can include three aspects, specifically as follows: 1. At the judgment time node, the visible duration of the working link of the earth station has not ended; 2. At the judgment time node, the visible duration of the working link of the earth station has ended; 3. At the judgment time node, the earth station is in an idle state.

[0057] In the above three states, the methods for establishing the final working link are as follows: when the earth station status is status 1 (at the judgment time node, the visible duration of the working link of the earth station has not ended), the existing working link is maintained; and the corresponding data processing can be performed through this working link. When the earth station status is status 2 (at the judgment time node, the visible duration of the working link of the earth station has ended), it means that this working link is not the optimal link. At this time, this working link can be released, and among the currently visible remote sensing satellites, the remote sensing satellite with the longest visible duration is selected to establish a new working link. When the earth station status is status 3 (at the judgment time node, the earth station is in an idle state), it means that there is no working link for this earth station currently. When a working link needs to be established, it is first judged whether there is a remote sensing satellite with a visible link. In the case of a remote sensing satellite with a visible link, the visible link with the longest visible duration is selected to establish a working link. The remote sensing satellites with visible links at this time include the remote sensing satellites newly added to the remote sensing satellite system.

[0058] In addition, for the specific application, in order to maintain the establishment of the optimal working link, the present invention further includes: before the end of the simulation time, continuously judging the working link with the shortest visible duration among all the working links at the initial time node, and updating the end moment of the visible duration of this working link to the judgment time node. This can ensure that before the end of the simulation time, the judgment time node is always the visible duration end time of the working link with the shortest visible time newly judged.

[0059] In addition, the principle for the present invention to select the effective working link for link establishment under visible conditions is that the link has the longest continuous visible time. In actual applications, other link establishment conditions can also be selected, such as: the highest elevation angle, the closest link distance, the strongest signal power, etc.

[0060] In summary, by means of the above technical solution of the present invention, the present invention can realize the behavior simulation of the establishment of the working link in the multi-satellite and multi-station remote sensing satellite system, improve the resource optimization configuration level and usage efficiency of the remote sensing constellation system, and better reflect the actual working mode and working state of the remote sensing satellite system. Therefore, the obtained simulation results and analysis conclusions are statistically closer to the actual state level of the functional indicators of the remote sensing satellite system.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A simulation method for establishing a working link of a remote sensing satellite system, characterized in that, The remote sensing satellite system has multiple remote sensing satellites and multiple earth stations, including: Determine the visible links between each remote sensing satellite and each earth station; and determine the visible durations of the respective visible links; Taking the orbital epoch moment of the remote sensing satellite system as the initial time node, select the visible link with the longest visible duration at the initial time node among the respective visible links to establish a working link; and recombine the remote sensing satellites and earth stations in the other visible links to establish a working link; Analyze all the working links, determine the working link with the shortest visible duration among all the working links at the initial time node, and obtain the end moment of the visible duration of this working link, and use this end moment as the judgment time node; Judge the status of each earth station at the judgment time node; and establish the final working link according to the judged status of the earth station.

2. The simulation method for establishing a working link of a remote sensing satellite system according to claim 1, characterized in that Determining the visible links between each remote sensing satellite and each earth station includes: Analyze the remote sensing satellite system to determine the initial phase parameters of each remote sensing satellite in the remote sensing satellite system; According to the initial phase parameters of each remote sensing satellite, determine the spatial position of each remote sensing satellite, and according to this spatial position, determine the visible link between the remote sensing satellite and the earth station.

3. The simulation method for establishing the working link of the remote sensing satellite system according to claim 1, characterized in that, It also includes: Before the end of the simulation time, continuously judge the working link with the shortest visible duration among all the working links at the initial time node, and update the end moment of the visible duration of this working link as the judgment time node.

4. The simulation method for establishing the working link of the remote sensing satellite system according to claim 1, characterized in that, The status of the earth station includes: At the judgment time node, the visible duration of the working link of the earth station has not ended; At the judgment time node, the visible duration of the working link of the earth station has ended; At the judgment time node, the earth station is in an idle state.

5. The simulation method for establishing a working link of a remote sensing satellite system according to claim 4, wherein Establishing the final working link according to the judged status of the earth station includes: If the status of the earth station is that at the judgment time node, the visible duration of the working link of the earth station has not ended, then maintain the existing working link; If the status of the earth station is that at the judgment time node, the visible duration of the working link of the earth station has ended, then release the working link, and among the currently visible remote sensing satellites, select the remote sensing satellite with the longest visible duration to establish a new working link; If the status of the earth station is that at the judgment time node, the earth station is in an idle state, then judge whether there are remote sensing satellites with visible links, and if the judgment result is that there are remote sensing satellites with visible links, select the visible link with the longest visible duration to establish a working link.

6. A simulation system for establishing a working link of a remote sensing satellite system, characterized in that, The remote sensing satellite system has multiple remote sensing satellites and multiple earth stations, including: A visible time determination module for determining the visible links between each remote sensing satellite and each earth station; and determining the visible durations of the respective visible links; An initial link establishment module for taking the orbital epoch moment of the remote sensing satellite system as the initial time node, selecting the visible link with the longest visible duration at the initial time node among the respective visible links to establish a working link; and recombining the remote sensing satellites and earth stations in the other visible links to establish a working link; The judgment time node determination module is used to analyze all working links, determine the working link with the shortest visible duration among all working links at the initial time node, and obtain the end moment of the visible duration of this working link, and use this end moment as the judgment time node; The final link establishment module is used to judge the status of each earth station at the judgment time node; and establish the final working link according to the judged earth station status.

7. The simulation system for establishing the working link of the remote sensing satellite system according to claim 6, characterized in that, When the visible time determination module determines the visual link between each remote sensing satellite and each earth station, it analyzes the remote sensing satellite system to determine the initial phase parameters of each remote sensing satellite in the remote sensing satellite system; And according to the initial phase parameters of each remote sensing satellite, determine the spatial position of each remote sensing satellite, and then determine the visual link between the remote sensing satellite and the earth station according to this spatial position.

8. The simulation system for establishing a working link of a remote sensing satellite system according to claim 6, characterized in that, The judgment time node determination module is also used to continuously judge the working link with the shortest visible duration among all working links at the initial time node before the end of the simulation time, and update the end moment of the visible duration of this working link as the judgment time node.

9. The simulation system for establishing the working link of the remote sensing satellite system according to claim 6, characterized in that, The earth station status includes: At the judgment time node, the visible duration of the working link of the earth station has not ended; At the judgment time node, the visible duration of the working link of the earth station has ended; At the judgment time node, the earth station is in an idle state.

10. The simulation system for establishing the working link of the remote sensing satellite system according to claim 9, characterized in that, When the final link establishment module establishes the final working link according to the judged earth station status, it includes: If the earth station status is that at the judgment time node, the visible duration of the working link of the earth station has not ended, then keep the existing working link; If the earth station status is that at the judgment time node, the visible duration of the working link of the earth station has ended, then release the working link, and among the currently visible remote sensing satellites, select the remote sensing satellite with the longest visible duration to establish a new working link; If the earth station status is that at the judgment time node, the earth station is in an idle state, then judge whether there is a remote sensing satellite with a visual link, and if the judgment result is that there is a remote sensing satellite with a visual link, select the visual link with the longest visible duration to establish a working link.

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