A remote sensing satellite simulation implementation method and system

Abstract

The present invention discloses a remote sensing satellite simulation implementation method and system, the remote sensing satellite has a movable beam antenna, the method includes: determining the pointing strategy of the movable beam antenna of the remote sensing satellite; obtaining the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; and constructing a Cartesian coordinate system with the remote sensing satellite as the origin according to the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; according to the Cartesian coordinate system, calculating the theoretical elevation angle and theoretical azimuth angle of the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station; and according to the theoretical elevation angle and the theoretical azimuth angle, determining the real-time elevation angle and real-time azimuth angle corresponding to the remote sensing satellite under different pointing strategies; according to the real-time elevation angle and the real-time azimuth angle, simulating the remote sensing satellite under the corresponding pointing strategy. The present invention can realize the simulation of various flexible pointing working modes of the movable beam antenna, so as to perform more accurate simulation analysis on the technical characteristics of the satellite link.

Description

Technical Field

[0001] The present invention relates to the technical field of remote sensing satellites, in particular to a remote sensing satellite simulation implementation method and system, and in particular to a remote sensing satellite simulation implementation method and system based on a movable beam antenna. Background Art

[0002] In recent years, more and more remote sensing satellites have adopted movable beam antennas to achieve higher gain and more flexible coverage. The directivity of remote sensing satellite antennas directly affects the transmission performance indicators of key links such as data transmission, measurement and control of remote sensing satellite systems, and is an important aspect of remote sensing satellite system planning demonstration, system design, frequency coordination and on-orbit operation management.

[0003] Since the working mode of the traditional equal flux antenna of the remote sensing satellite is relatively simple, that is, the antenna is fixed relative to the satellite body, the satellite is aimed at the sub-satellite point on the ground, ensuring that the main axis of the satellite antenna also points to the sub-satellite point at the same time. As the satellite operates in orbit, the trajectory of the sub-satellite point changes continuously, causing the satellite antenna beam direction to change accordingly.

[0004] Currently, movable beam antennas are movable relative to the satellite body, which can provide more flexible pointing capabilities and a larger communication range, but this performance improvement poses a challenge to satellite system simulation methods. Traditional satellite antenna simulation methods cannot meet the dynamic characteristics of satellite movable beam antennas, so the simulation results cannot reflect the changes in movable beam pointing and the resulting changes in satellite communication link performance.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In view of the problems in the related art, the present invention proposes a remote sensing satellite simulation implementation method and system, which can realize the simulation of various flexible pointing working modes of a movable beam antenna, so as to perform more accurate simulation analysis on the technical characteristics of the satellite link.

[0007] The technical solution of the present invention is achieved in this way:

[0008] According to one aspect of the present invention, a remote sensing satellite simulation implementation method is provided, wherein the remote sensing satellite has a movable beam antenna.

[0009] The remote sensing satellite simulation implementation method comprises:

[0010] Analyze the movable beam antenna of the remote sensing satellite and determine the pointing strategy of the movable beam antenna of the remote sensing satellite;

[0011] Obtaining the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; and constructing a Cartesian coordinate system with the remote sensing satellite as the origin based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite;

[0012] According to the Cartesian coordinate system, the theoretical elevation angle and the theoretical azimuth angle of the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station are calculated; and according to the theoretical elevation angle and the theoretical azimuth angle, the real-time elevation angle and the real-time azimuth angle corresponding to the remote sensing satellite under different pointing strategies are determined;

[0013] According to the real-time elevation angle and real-time azimuth angle, the remote sensing satellite under the corresponding pointing strategy is simulated.

[0014] Furthermore, the pointing strategy of the movable beam antenna of the remote sensing satellite includes:

[0015] The remote sensing satellite's movable beam antenna is pointed toward the earth station;

[0016] The remote sensing satellite's movable beam antenna is pointed to the sub-satellite point;

[0017] The remote sensing satellite's movable beam antenna scans within a preset spatial range area.

[0018] Furthermore, obtaining the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite includes: obtaining the geographic coordinates of the earth station according to a preconfigured geographic coordinate system; and obtaining the spatial coordinates of the remote sensing satellite according to a preconfigured national geodetic coordinate system.

[0019] Furthermore, when a Cartesian coordinate system with the remote sensing satellite as the origin is constructed based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite, the direction of the X vector of the Cartesian coordinate system is positive from the remote sensing satellite to the east; the direction of the Y vector of the Cartesian coordinate system is positive from the remote sensing satellite to the center of the earth; and the direction of the Z vector of the Cartesian coordinate system is positive from the remote sensing satellite to the north.

[0020] Furthermore, when the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite points to the earth station, the real-time elevation angle corresponding to the remote sensing satellite is equal to the theoretical elevation angle, and the real-time azimuth angle corresponding to the remote sensing satellite is equal to the theoretical azimuth angle.

[0021] Furthermore, when the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite points to the sub-satellite point, the real-time elevation angle and the real-time azimuth angle corresponding to the remote sensing satellite are both zero.

[0022] Furthermore, the pointing strategy of the movable wave antenna of the remote sensing satellite is that when the movable wave antenna of the remote sensing satellite scans within a preset spatial range area, the real-time direction and real-time position of the movable wave antenna are determined according to the direction and area range of the preset spatial range area, and the real-time elevation angle and real-time azimuth angle of the remote sensing satellite at the current moment are calculated according to the real-time direction and real-time position through the theoretical elevation angle and theoretical azimuth angle.

[0023] According to another aspect of the present invention, a remote sensing satellite simulation implementation system is provided, wherein the remote sensing satellite has a movable beam antenna.

[0024] The remote sensing satellite simulation implementation system includes:

[0025] A pointing strategy determination module is used to analyze the movable beam antenna of the remote sensing satellite and determine the pointing strategy of the movable beam antenna of the remote sensing satellite;

[0026] A coordinate system construction module is used to obtain the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; and to construct a Cartesian coordinate system with the remote sensing satellite as the origin based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite;

[0027] An angle calculation module is used to calculate the theoretical elevation angle and theoretical azimuth angle of the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station according to the Cartesian coordinate system; and determine the real-time elevation angle and real-time azimuth angle corresponding to the remote sensing satellite under different pointing strategies according to the theoretical elevation angle and theoretical azimuth angle

[0028] The satellite simulation module is used to simulate the remote sensing satellite under the corresponding pointing strategy according to the real-time elevation angle and real-time azimuth angle.

[0029] Furthermore, the pointing strategy of the movable beam antenna of the remote sensing satellite includes:

[0030] The remote sensing satellite's movable beam antenna is pointed toward the earth station;

[0031] The remote sensing satellite's movable beam antenna is pointed to the sub-satellite point;

[0032] The remote sensing satellite's movable beam antenna scans within a preset spatial range area.

[0033] Furthermore, when a Cartesian coordinate system with the remote sensing satellite as the origin is constructed based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite, the direction of the X vector of the Cartesian coordinate system is positive from the remote sensing satellite to the east; the direction of the Y vector of the Cartesian coordinate system is positive from the remote sensing satellite to the center of the earth; and the direction of the Z vector of the Cartesian coordinate system is positive from the remote sensing satellite to the north.

[0034] Furthermore, when the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite points to the earth station, the real-time elevation angle corresponding to the remote sensing satellite is equal to the theoretical elevation angle, and the real-time azimuth angle corresponding to the remote sensing satellite is equal to the theoretical azimuth angle.

[0035] Furthermore, when the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite points to the sub-satellite point, the real-time elevation angle and the real-time azimuth angle corresponding to the remote sensing satellite are both zero.

[0036] Furthermore, the pointing strategy of the movable wave antenna of the remote sensing satellite is that when the movable wave antenna of the remote sensing satellite scans within a preset spatial range area, the angle calculation module determines the real-time direction and real-time position of the movable wave antenna according to the direction and area range of the preset spatial range area, and then calculates the real-time elevation angle and real-time azimuth angle of the remote sensing satellite at the current moment based on the real-time direction and real-time position through the theoretical elevation angle and theoretical azimuth angle.

[0037] Beneficial effect: Compared with the traditional remote sensing satellite fixed-beam antenna simulation, the present invention provides a universal method for describing the movable beam antenna simulation, and supports the simulation implementation method of antenna beam pointing in various scenarios such as the antenna beam is movable in the elevation direction, or movable in the azimuth direction, or movable in both the elevation and azimuth directions. The simulation results achieved by the present invention better reflect the actual working mode and working status of the remote sensing satellite system. Therefore, the obtained simulation results and analysis conclusions are statistically closer to the actual status level of the remote sensing satellite system functional indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 is a flow chart of a remote sensing satellite simulation implementation method according to an embodiment of the present invention;

[0040] Figure 2 The present invention is a structural block diagram of a remote sensing satellite simulation implementation system according to an embodiment of the present invention.

[0041] Figure 3 According to an embodiment of the present invention, a Cartesian coordinate system with the remote sensing satellite as the origin is constructed based on the geographical coordinates of the earth station and the spatial coordinates of the remote sensing satellite. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0043] According to an embodiment of the present invention, a remote sensing satellite simulation implementation method and system are provided.

[0044] like Figure 1 As shown, the remote sensing satellite simulation implementation method according to an embodiment of the present invention includes:

[0045] Step S101, analyzing the movable beam antenna of the remote sensing satellite to determine the pointing strategy of the movable beam antenna of the remote sensing satellite;

[0046] Step S103, obtaining the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; and constructing a Cartesian coordinate system with the remote sensing satellite as the origin according to the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite;

[0047] Step S105, calculating the theoretical elevation angle and theoretical azimuth angle of the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station according to the Cartesian coordinate system; and determining the real-time elevation angle and real-time azimuth angle corresponding to the remote sensing satellite under different pointing strategies according to the theoretical elevation angle and theoretical azimuth angle;

[0048] Step S107, performing simulation processing on the remote sensing satellite under the corresponding pointing strategy according to the real-time elevation angle and the real-time azimuth angle.

[0049] like Figure 2 As shown, a remote sensing satellite simulation implementation system according to an embodiment of the present invention includes:

[0050] The pointing strategy determination module 201 is used to analyze the movable beam antenna of the remote sensing satellite and determine the pointing strategy of the movable beam antenna of the remote sensing satellite;

[0051] A coordinate system construction module 203 is used to obtain the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; and to construct a Cartesian coordinate system with the remote sensing satellite as the origin according to the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite;

[0052] Angle calculation module 205, used to calculate the theoretical elevation angle and theoretical azimuth angle of the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station according to the Cartesian coordinate system; and determine the real-time elevation angle and real-time azimuth angle corresponding to the remote sensing satellite under different pointing strategies according to the theoretical elevation angle and theoretical azimuth angle

[0053] The satellite simulation module 207 is used to simulate the remote sensing satellite under the corresponding pointing strategy according to the real-time elevation angle and the real-time azimuth angle.

[0054] In specific applications, the geographic coordinates of the earth station are obtained according to the geographic coordinate system; the spatial coordinates of the remote sensing satellite are obtained according to the J2000 coordinate system. When constructing a Cartesian coordinate system with the remote sensing satellite as the origin based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite, it can be as follows Figure 3 ( Figure 3 In the figure, EI refers to the elevation angle from the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station; AZ refers to the azimuth angle from the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station), the direction of the X vector of the Cartesian coordinate system is positive from the remote sensing satellite to the east; the direction of the Y vector of the Cartesian coordinate system is positive from the remote sensing satellite to the center of the earth; the direction of the Z vector of the Cartesian coordinate system is positive from the remote sensing satellite to the north.

[0055] For the movable wave antenna, its pointing strategy generally includes: 1. The movable wave antenna of the remote sensing satellite points to the earth station; 2. The movable wave antenna of the remote sensing satellite points to the sub-satellite point; 3. The movable wave antenna of the remote sensing satellite scans within a preset spatial range area.

[0056] When the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite points to the earth station, the real-time elevation angle corresponding to the remote sensing satellite is equal to the theoretical elevation angle, and the real-time azimuth angle corresponding to the remote sensing satellite is equal to the theoretical azimuth angle. When the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite points to the sub-satellite point, the real-time elevation angle and real-time azimuth angle corresponding to the remote sensing satellite are both zero.

[0057] When the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite scans within a preset spatial range area, the real-time direction and real-time position of the movable wave antenna are determined according to the direction and area range of the preset spatial range area, and the real-time elevation angle and real-time azimuth angle of the remote sensing satellite at the current moment are calculated according to the real-time direction and real-time position through the theoretical elevation angle and theoretical azimuth angle. For example: when the scanning range of the remote sensing satellite antenna is 70 degrees in the east-west direction, the real-time elevation angle is ±70 degrees, and the real-time azimuth angle is ±90 degrees; when the scanning range of the remote sensing satellite antenna is a 30-degree conical area, the real-time elevation angle is ±30 degrees, and the real-time azimuth angle is ±180 degrees; when the scanning range of the remote sensing satellite antenna is 360 degrees, the real-time elevation angle is ±90 degrees, and the real-time azimuth angle is ±180 degrees.

[0058] In summary, with the aid of the above-mentioned technical scheme of the present invention, the present invention provides a general simulation method for describing movable beam antennas, and supports a simulation implementation method for antenna beam pointing in various scenarios such as the antenna beam is movable in the elevation direction, or movable in the azimuth direction, or movable in both the elevation and azimuth directions. The simulation results implemented by the present invention 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. In addition, the simulation implementation method for describing the beam pointing of the satellite antenna with general elevation and azimuth angles provided by the present invention is also applicable to various types of satellites, including communication, navigation, remote sensing, and scientific experiment / test satellite antenna beam pointing strategy simulation implementation; it is also applicable to various types of earth stations antenna beam pointing strategy simulation implementation; the elevation angle and azimuth angle mentioned in the present invention can also have different naming methods, such as sidelobe angle, off-axis angle, isolation angle, etc., as long as it conforms to Figure 3 The angular relationships shown are the same and are within the scope of the present invention.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A remote sensing satellite simulation implementation method, characterized in that: The remote sensing satellite has a movable beam antenna, including: Analyze the movable beam antenna of the remote sensing satellite and determine the pointing strategy of the movable beam antenna of the remote sensing satellite; Obtaining the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; and constructing a Cartesian coordinate system with the remote sensing satellite as the origin based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; According to the Cartesian coordinate system, the theoretical elevation angle and the theoretical azimuth angle of the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station are calculated; and according to the theoretical elevation angle and the theoretical azimuth angle, the real-time elevation angle and the real-time azimuth angle corresponding to the remote sensing satellite under different pointing strategies are determined; According to the real-time elevation angle and real-time azimuth angle, the remote sensing satellite under the corresponding pointing strategy is simulated.

2. The remote sensing satellite simulation implementation method according to claim 1, characterized in that: The pointing strategy of the movable beam antenna of the remote sensing satellite includes: The remote sensing satellite's movable beam antenna is pointed toward the earth station; The remote sensing satellite's movable beam antenna is pointed to the sub-satellite point; The remote sensing satellite's movable beam antenna scans within a preset spatial range area.

3. The remote sensing satellite simulation implementation method according to claim 2, characterized in that: Obtaining the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite includes: Obtaining the geographic coordinates of the earth station according to a pre-configured geographic coordinate system; Obtain the spatial coordinates of the remote sensing satellite according to the pre-configured national geodetic coordinate system.

4. The remote sensing satellite simulation implementation method according to claim 1, characterized in that: When constructing a Cartesian coordinate system with the remote sensing satellite as the origin based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite, the direction of the X vector of the Cartesian coordinate system is positive from the remote sensing satellite to the east; the direction of the Y vector of the Cartesian coordinate system is positive from the remote sensing satellite to the center of the earth; and the direction of the Z vector of the Cartesian coordinate system is positive from the remote sensing satellite to the north.

5. The remote sensing satellite simulation implementation method according to claim 2, characterized in that: When the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite points to the earth station, the real-time elevation angle corresponding to the remote sensing satellite is equal to the theoretical elevation angle, and the real-time azimuth angle corresponding to the remote sensing satellite is equal to the theoretical azimuth angle.

6. The remote sensing satellite simulation implementation method according to claim 2, characterized in that: When the pointing strategy of the movable wave antenna of the remote sensing satellite is that the movable wave antenna of the remote sensing satellite points to the sub-satellite point, the real-time elevation angle and the real-time azimuth angle corresponding to the remote sensing satellite are both zero.

7. The remote sensing satellite simulation implementation method according to claim 2, characterized in that: The pointing strategy of the movable wave antenna of the remote sensing satellite is that when the movable wave antenna of the remote sensing satellite scans within a preset spatial range area, the real-time direction and real-time position of the movable wave antenna are determined according to the direction and area range of the preset spatial range area, and the real-time elevation angle and real-time azimuth angle of the remote sensing satellite at the current moment are calculated according to the real-time direction and real-time position through the theoretical elevation angle and theoretical azimuth angle.

8. A remote sensing satellite simulation implementation system, characterized in that: The remote sensing satellite has a movable beam antenna, including: A pointing strategy determination module is used to analyze the movable beam antenna of the remote sensing satellite and determine the pointing strategy of the movable beam antenna of the remote sensing satellite; A coordinate system construction module is used to obtain the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; and to construct a Cartesian coordinate system with the remote sensing satellite as the origin based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite; An angle calculation module is used to calculate the theoretical elevation angle and theoretical azimuth angle of the line connecting the satellite and the sub-satellite point to the line connecting the satellite and the earth station according to the Cartesian coordinate system; and determine the real-time elevation angle and real-time azimuth angle corresponding to the remote sensing satellite under different pointing strategies according to the theoretical elevation angle and theoretical azimuth angle The satellite simulation module is used to simulate the remote sensing satellite under the corresponding pointing strategy according to the real-time elevation angle and real-time azimuth angle.

9. The remote sensing satellite simulation implementation system according to claim 8, characterized in that: The pointing strategy of the movable beam antenna of the remote sensing satellite includes: The remote sensing satellite's movable beam antenna is pointed toward the earth station; The remote sensing satellite's movable beam antenna is pointed to the sub-satellite point; The remote sensing satellite's movable beam antenna scans within a preset spatial range area.

10. The remote sensing satellite simulation implementation system according to claim 9, characterized in that: When constructing a Cartesian coordinate system with the remote sensing satellite as the origin based on the geographic coordinates of the earth station and the spatial coordinates of the remote sensing satellite, the direction of the X vector of the Cartesian coordinate system is positive from the remote sensing satellite to the east; the direction of the Y vector of the Cartesian coordinate system is positive from the remote sensing satellite to the center of the earth; and the direction of the Z vector of the Cartesian coordinate system is positive from the remote sensing satellite to the north.

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