Method and system for continuously updating track of large-range moving target of active remote sensing satellite

Abstract

The invention provides a continuous track updating method and system for a large-range moving target of an active remote sensing satellite. The method comprises the following steps: the active remote sensing satellite performs time-division and region-division search on a detectable view field range according to task requirements; after a target is found through searching, a searching and tracking working mode is adopted; repeating the execution until the task requirement is completed; the active remote sensing satellites capable of detecting overlapping view field ranges carry out transmission and relay tracking on target position information; and active remote sensing satellite networking. According to the large-range area detection requirement, the speed of the moving target is considered, the detectable view field range of the active remote sensing satellites and the working mode of searching and tracking are combined, and through networking of multiple satellites, the detection requirements of large-range leakage-free search discovery, multi-target track rapid updating and high-precision positioning of the moving target are met. The method is simple, reliable and stable in work, wide in universal range and high in applicability, and has good application prospects and market prospects.

Description

Technical Field

[0001] The present invention belongs to the field of satellite overall design, and specifically relates to a method and system for continuously updating the track of a large-scale moving target of an active remote sensing satellite, and more particularly to an efficiency optimization design of an on-orbit application mode of an active remote sensing satellite. Background Art

[0002] Active remote sensing satellites are equipped with multifunctional active remote sensing that integrates search and tracking. They have the advantages of high position, large coverage, high positioning accuracy, and downward vision that is conducive to the search of small moving targets. They can significantly improve target search capabilities, and at the same time, take advantage of the satellite's non-fixed position to provide effective surrounding situation information for long-distance moving targets.

[0003] At present, active remote sensing satellites are mainly used for stationary target tasks, relying on the ground for long-term task planning and allocation, and satellite detection data needs to be transmitted back to the ground, processed on the ground, and then transmitted to the required user units through other links, which makes the data obtained by users less timely. This method is not suitable for obtaining information on moving targets. For tracking and searching large-scale moving targets, independent satellites are generally used to perform search and tracking tasks respectively. In this way, large-scale discovery and tracking tasks cannot be taken into account at the same time, data timeliness is poor, and targets are difficult to track continuously.

[0004] Patent document "A radar simulation target track tracking method and system" (CN106932771A) discloses a method of using a track list to calculate the spatial statistical distance and generate a matrix, selecting the minimum value of the spatial statistical distance matrix, and obtaining the target track. However, the invention does not involve the use of active remote sensing satellites to achieve target track tracking.

[0005] Patent document "A dead reckoning assisted departure angle direction finding positioning method" (CN114894196A) discloses using AOD fusion positioning estimation value, Kalman filter result, and sensor data to correct the dead reckoning algorithm state information; using sensor data, correction information, and time interval to perform dead reckoning positioning estimation. However, the invention does not involve using two active remote sensing satellites to improve the target track positioning accuracy.

[0006] The patent document "Tracking radar track quality assessment method, system and medium based on residual statistics" (CN111366900A) discloses that the radar track quality assessment algorithm based on residual statistics can significantly improve the accuracy of track quality by considering the correlation between radar residual and error; the patent document "Moving target tracking method based on multi-target characteristics and improved correlation filter" (CN110490907A) discloses how to effectively track moving targets from the perspective of signals to achieve better tracking accuracy and real-time performance. However, these patents do not involve the composition and working mode of the target track continuous update system.

[0007] Patent document "Optical Dual-satellite Positioning Multi-Moving Target Association Method and System" (CN114485668A) discloses using images simultaneously acquired by optical dual satellites to perform target detection, calculate matching scores for multiple targets in pairs, and construct an adaptation matrix, which can provide the best association solution when there are multiple moving targets in the scene. This invention involves the positioning of moving targets by optical satellites rather than active remote sensing satellites. As a passive means, it cannot detect all day and all weather, and due to the characteristics of the working mode, it cannot quickly switch to detect different areas.

[0008] Existing technical solutions generally have problems such as missed search targets, limited number of tracked targets, poor data timeliness, and low positioning accuracy. Therefore, it is necessary to design a method that can be based on the needs of large-scale regional detection, consider the speed of moving targets, and combine the detectable field of view of active remote sensing satellites and the search and tracking working mode. Active remote sensing satellites rely on their characteristic advantages and form a network of multiple satellites to achieve a detection method that can realize large-scale, leak-free search and discovery of moving targets, rapid update of multi-target tracks, and high-precision positioning. Summary of the invention

[0009] In view of the defects in the prior art, the object of the present invention is to provide a method and system for continuously updating the track of a large-scale moving target of an active remote sensing satellite.

[0010] According to the present invention, a method for continuously updating the track of a large-scale moving target of an active remote sensing satellite is provided, comprising:

[0011] Step S1: Use active remote sensing satellites to conduct time-division and region-division searches on the area of ​​interest according to mission requirements.

[0012] Step S2: After searching and finding the target, the search and tracking working mode is adopted.

[0013] When passing the top, steps S1 to S2 are repeatedly executed until the task requirement is completed and stopped.

[0014] Step S3: Transmitting and relaying target location information through active remote sensing satellites with overlapping detectable fields of view.

[0015] Step S4: Active remote sensing satellite networking.

[0016] The over-the-top refers to the projection of the satellite on the celestial sphere coinciding with the zenith.

[0017] Preferably, in step S1, the area of ​​interest is divided into a plurality of set areas according to a single search range of the active remote sensing satellite.

[0018] When the active remote sensing satellite passes overhead, multiple areas are searched in sequence according to mission requirements.

[0019] In step S2, when a target is found during the active remote sensing satellite search, the target is tracked immediately.

[0020] The search and track working mode is to track multiple targets within the area of ​​interest while searching.

[0021] Preferably, the active remote sensing satellite completes search, discovery and tracking of multiple targets when passing overhead based on the relative positional relationship between the detectable field of view and the area of ​​interest;

[0022] The area of ​​interest is A×B, which is divided into N=ceil(A / P)×ceil(B / Q) single search ranges. The active remote sensing satellite completes the search of N search ranges in sequence according to the mission requirements. It takes a total of N×t time for the satellite to pass over the top.

[0023] Where A represents the length of the area of ​​interest parallel to the direction of the satellite trajectory;

[0024] B represents the length of the area of ​​interest perpendicular to the direction of the satellite track;

[0025] P represents the single search range of the active remote sensing satellite in azimuth;

[0026] Q represents the single search range of the active remote sensing satellite in the range direction;

[0027] ceil() means rounding up a decimal value;

[0028] t represents the time taken for each search range.

[0029] Preferably, in step S3, when the target enters the overlapping range of the detectable field of view, the position information of the target is transmitted via an intersatellite link.

[0030] The active remote sensing satellite immediately tracks the target after receiving the tracking mission requirement information and processes the target's position information.

[0031] In step S4, multiple active remote sensing satellites are networked to continuously detect the area under the detectable field of view, and can continuously track multiple targets and quickly update the track.

[0032] The detection search interval time is less than a single search range divided by the moving target speed.

[0033] According to the present invention, a track continuous updating system for a large-scale moving target of an active remote sensing satellite is provided, comprising:

[0034] Module M1: Active remote sensing satellites conduct time- and region-based searches of areas of interest based on mission requirements.

[0035] Module M2: After searching and finding the target, the search and tracking working mode is adopted.

[0036] Among them, when passing the top, module M1 to module M2 are repeatedly triggered until the task requirements are completed and stopped.

[0037] Module M3: Active remote sensing satellites with overlapping fields of view can be detected to transmit and relay target location information.

[0038] Module M4: Active remote sensing satellite networking.

[0039] The over-the-top refers to the projection of the satellite on the celestial sphere coinciding with the zenith.

[0040] Preferably, in the module M1, the area of ​​interest is divided into a plurality of set areas according to a single search range of the active remote sensing satellite.

[0041] When an active remote sensing satellite passes overhead, it searches multiple set areas in sequence according to mission requirements.

[0042] When a target is found during the active remote sensing satellite search in the module M2, the target is tracked immediately.

[0043] The search and track working mode is to track multiple targets within the area of ​​interest while searching.

[0044] Preferably, the active remote sensing satellite completes the search, discovery and tracking of multiple targets when passing overhead based on the relative positional relationship between the detectable field of view and the area of ​​interest.

[0045] The area of ​​interest is A×B, which is divided into N=ceil(A / P)×ceil(B / Q) single search ranges. The active remote sensing satellite completes the search of N search ranges in sequence according to the mission requirements. It takes a total of N×t time for the satellite to pass over the top.

[0046] Where A represents the length of the area of ​​interest parallel to the direction of the satellite trajectory;

[0047] B represents the length of the area of ​​interest perpendicular to the direction of the satellite track;

[0048] P represents the single search range of the active remote sensing satellite in azimuth;

[0049] Q represents the single search range of the active remote sensing satellite in the range direction;

[0050] ceil() means rounding up a decimal value;

[0051] t represents the time taken for each search range.

[0052] Preferably, in the module M3, when the target enters the overlapping range of the detectable field of view, the position information of the target is transmitted through the intersatellite link.

[0053] After receiving the tracking mission requirement information, the active remote sensing satellite immediately tracks the target and processes the target's location information.

[0054] The multiple active remote sensing satellites in the module M4 are networked to continuously detect the area under the detectable field of view, and can continuously track multiple targets and quickly update the track.

[0055] The detection search interval time is less than a single search range divided by the moving target speed.

[0056] According to a computer-readable storage medium storing a computer program provided by the present invention, when the computer program is executed by a processor, the steps of the method for continuously updating the track of a large-scale moving target of an active remote sensing satellite are implemented.

[0057] A satellite system provided according to the present invention comprises the track continuous updating system of the active remote sensing satellite large-scale moving target.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. The present invention is based on the needs of large-scale regional detection, regional search based on the motion characteristics of moving targets, and simultaneous tracking of multiple targets in multiple regions, combined with the detectable field of view of active remote sensing satellites and the working mode of search and tracking, to achieve the detection needs of rapid update of multi-target tracks and high-precision positioning;

[0060] 2. The present invention uses active remote sensing satellites to switch radio beams, which can quickly switch the detection of different areas in a short time. The method is simple, the operation is reliable and stable, the general range is wide, the applicability is strong, and it has good application prospects and market prospects.

[0061] 3. The present invention takes into account the speed of moving targets and establishes a continuous detection system of multiple active remote sensing satellites through a multi-satellite network to achieve the detection requirements of large-scale, leak-free search and discovery of moving targets.

[0062] 4. The present invention uses the overlapping area of ​​the dual-satellite field of view to improve positioning accuracy, and fully utilizes the method of large-scale search and discovery by active remote sensing satellites and large-scale multi-beam tracking to achieve migration and application without sacrificing the advantages of active remote sensing satellites. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0064] Figure 1 This is a schematic diagram of the detectable field of view and search and tracking working mode of an active remote sensing satellite.

[0065] Figure 2 This is a schematic diagram of the time- and region-based search of a large area when an active remote sensing satellite passes overhead.

[0066] Figure 3 Schematic diagram of relay tracking between two adjacent active remote sensing satellites.

[0067] The figure shows:

[0068] DETAILED DESCRIPTION

[0069] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0070] According to the present invention, a method for continuously updating the track of a large-scale moving target of an active remote sensing satellite is provided, comprising the following steps:

[0071] Step S1: Before the active remote sensing satellite passes overhead, a time-based and regional search is performed on the area of ​​interest according to mission requirements;

[0072] by Figure 1 For example, the active remote sensing satellite 1 has the capability of radio beam scanning and fast switching, and also has the capability of large azimuth and elevation detection. Its detectable field of view 2 can reach several million square kilometers, and the single search range 3 is assumed to be P×Q;

[0073] Where P represents the single search range of the active remote sensing satellite in azimuth;

[0074] Q represents the single search range of the active remote sensing satellite in the distance direction.

[0075] In step S1, the area of ​​interest is divided into multiple areas according to the single search range capability of the satellite.

[0076] In step S1, the active remote sensing satellite sequentially completes the search of multiple areas within a large range through onboard mission planning during a single pass.

[0077] Step S2: After the active remote sensing satellite searches and finds the target, it adopts the search and tracking working mode to track multiple targets and continue to search the new area at the same time;

[0078] by Figure 1For example, when the active remote sensing satellite 1 searches and finds a moving target 9 within a single search range 3, the target is immediately switched to tracking. The tracking beam 4 can be used to track the target. At the same time, the tracking beam 4 can be used to continuously track other multiple targets within the detectable field of view 2 to achieve rapid update of the track.

[0079] In step S2, the target found during the active remote sensing satellite search is immediately tracked.

[0080] In step S2, multiple targets within the detectable field of view are tracked while performing the search task, so as to achieve rapid update of the track.

[0081] In more preferred embodiments, each active remote sensing satellite executes step S1 to step S2 when passing overhead to complete the work;

[0082] Each active remote sensing satellite completes a wide range of search and discovery and tracks multiple targets each time it passes overhead, based on the relative positional relationship between the detectable field of view and the area of ​​concern.

[0083] by Figure 2 For example, the area 10 that requires attention is assumed to be A×B, which can be divided into N=ceil(A / P)×ceil(B / Q) single search ranges 3. During a pass-over process, the active remote sensing satellite 1 completes the search of N search ranges within the area of ​​attention in sequence through on-board mission planning. Assuming that the time taken for each search range is t, the total time required for the satellite to pass over is N×t.

[0084] Where A represents the length of the area of ​​interest parallel to the direction of the satellite trajectory;

[0085] B represents the length of the area of ​​interest perpendicular to the direction of the satellite track;

[0086] ceil() means rounding up a decimal value;

[0087] t represents the time taken for each search range.

[0088] Based on the motion characteristics of moving targets, the system conducts regional searches and tracks multiple targets in multiple regions at the same time, thus solving the problem of missed targets during search and discovery, while taking into account large-scale discovery and tracking tasks.

[0089] Step S3: Active remote sensing satellites with overlapping detection fields can achieve seamless transmission and relay tracking of target location information, and dual satellites can further improve target positioning accuracy;

[0090] In step S3, when the tracking target enters the overlapping range of the detectable field of view of two adjacent active remote sensing satellites, the two satellites realize real-time transmission of the target position information through an inter-satellite link.

[0091] In step S3, the next active remote sensing satellite immediately tracks the target after receiving the tracking task, and the target position information detected by the two satellites can be processed to further improve the target positioning accuracy.

[0092] by Figure 3 For example, when the tracking target 7 enters the overlapping range of the detectable field of view 3 and 4 of the two adjacent active remote sensing satellites 1 and 2, the tracking beams 5 and 6 of the active remote sensing satellites 1 and 2, the two satellites 1 and 2 realize the real-time transmission of the target position information through the intersatellite link 8. After receiving the tracking task, the next active remote sensing satellite 2 immediately tracks the target, and the target position information detected by the two satellites can be processed to further improve the target positioning accuracy.

[0093] The positioning accuracy is improved by utilizing the overlapping field of view of the two satellites, and the method of large-scale search and discovery by active remote sensing satellites and large-scale multi-beam tracking is fully utilized. By establishing a continuous detection system of multiple active remote sensing satellites, the search and tracking working mode is fully utilized, thereby realizing migration and application without sacrificing the advantages of active remote sensing satellites, and solving the problems of poor data timeliness and low positioning accuracy.

[0094] Step S4: Through the networking of multiple active remote sensing satellites, continuous and rapid track updates of multiple targets over a large area can be achieved, and new targets can be discovered without omission.

[0095] In step S4, the networking of multiple active remote sensing satellites should achieve continuous detection of a large area under the detectable field of view, that is, continuous tracking of multiple targets and rapid update of tracks.

[0096] In step S4, when the search interval of multiple active remote sensing satellites in a network for any area within a large range is less than the single search range divided by the speed of the moving target, a leak-free search and discovery of the moving target can be achieved.

[0097] The present invention also provides a system for continuously updating the track of an active remote sensing satellite with a large range of moving targets. The system for continuously updating the track of an active remote sensing satellite with a large range of moving targets can be realized by executing the process steps of the method for continuously updating the track of an active remote sensing satellite with a large range of moving targets, that is, those skilled in the art can understand the method for continuously updating the track of an active remote sensing satellite with a large range of moving targets as a preferred implementation of the system for continuously updating the track of an active remote sensing satellite with a large range of moving targets.

[0098] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0099] According to the present invention, a track continuous updating system for a large-scale moving target of an active remote sensing satellite is provided, comprising:

[0100] Module M1: Active remote sensing satellites conduct time-based and regional searches of the area of ​​interest based on mission requirements;

[0101] Module M2: After searching and finding the target, the search and tracking working mode is adopted;

[0102] Among them, when passing the top, the module M1 to the module M2 are repeatedly triggered until the task requirement is completed and stopped;

[0103] Module M3: Active remote sensing satellites with overlapping fields of view can be used to transmit and relay target location information;

[0104] Module M4: Active remote sensing satellite networking;

[0105] The over-the-top refers to the projection of the satellite on the celestial sphere coinciding with the zenith.

[0106] In more preferred examples, the module M1 divides the area of ​​interest into a plurality of set areas according to a single search range of an active remote sensing satellite.

[0107] When an active remote sensing satellite passes overhead, it searches multiple set areas in sequence according to mission requirements.

[0108] When a target is found during the active remote sensing satellite search in the module M2, the target is tracked immediately.

[0109] The search and track working mode is to track multiple targets within the area of ​​interest while searching.

[0110] In more preferred examples, the active remote sensing satellite completes search, discovery and tracking of multiple targets when passing overhead based on the relative positional relationship between the detectable field of view and the area of ​​interest.

[0111] The area of ​​interest is A×B, which is divided into N=ceil(A / P)×ceil(B / Q) single search ranges. The active remote sensing satellite completes the search of N search ranges in sequence according to the mission requirements. It takes a total of N×t time for the satellite to pass over the top.

[0112] Where A represents the length of the area of ​​interest parallel to the direction of the satellite trajectory;

[0113] B represents the length of the area of ​​interest perpendicular to the direction of the satellite track;

[0114] P represents the single search range of the active remote sensing satellite in azimuth;

[0115] Q represents the single search range of the active remote sensing satellite in the range direction;

[0116] ceil() means rounding up a decimal value;

[0117] t represents the time taken for each search range.

[0118] In more preferred examples, when the target enters the overlapping range of the detectable field of view in the module M3, the position information of the target is transmitted through the intersatellite link.

[0119] After receiving the tracking mission requirement information, the active remote sensing satellite immediately tracks the target and processes the target's location information.

[0120] The multiple active remote sensing satellites in the module M4 are networked to continuously detect the area under the detectable field of view, and can continuously track multiple targets and quickly update the track.

[0121] The detection search interval time is less than a single search range divided by the moving target speed.

[0122] According to a computer-readable storage medium storing a computer program provided by the present invention, when the computer program is executed by a processor, the steps of the method for continuously updating the track of a large-scale moving target of an active remote sensing satellite are implemented.

[0123] A satellite system provided according to the present invention includes the track continuous updating system of the active remote sensing satellite large-scale moving target, or the computer-readable storage medium storing the computer program.

[0124] The method and system for continuously updating the track of a large-scale moving target of an active remote sensing satellite of the present invention, based on the detection requirements of a large-scale area, taking into account the speed of the moving target, combining the detectable field of view range of the active remote sensing satellite and the working mode of search and tracking, realizes the detection requirements of large-scale non-missing search and discovery of moving targets, rapid updating of multi-target tracks and high-precision positioning through a multi-satellite network. The method is simple, reliable and stable in operation, has a wide general scope, strong applicability, and has good application prospects and market prospects.

[0125] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for continuously updating the track of a large-scale moving target using an active remote sensing satellite. It is characterized in that include: Step S1: Conduct time-division and region-division searches of the area of ​​interest according to mission requirements through active remote sensing satellites; Step S2: After the target is found, the search and tracking working mode is adopted; When passing the top, step S1 to step S2 are repeatedly executed until the task requirement is completed; Step S3: transmitting and relaying target location information through active remote sensing satellites with overlapping detectable fields of view; Step S4: Active remote sensing satellite networking; The over-the-top refers to the projection of the satellite on the celestial sphere coinciding with the zenith.

2. The method for continuously updating the track of a large-scale moving target of an active remote sensing satellite according to claim 1, It is characterized in that In the step S1, the area of ​​interest is divided into a plurality of areas according to a single search range of the active remote sensing satellite; When the active remote sensing satellite passes overhead, multiple areas are searched in sequence according to mission requirements; In the step S2, a target is found during the active remote sensing satellite search process, and the target is tracked immediately; The search and track working mode is to track multiple targets within the area of ​​interest while searching.

3. The method for continuously updating the track of a large-scale moving target of an active remote sensing satellite according to claim 1, It is characterized in that The active remote sensing satellite completes search, discovery and tracking of multiple targets when passing overhead based on the relative positional relationship between the detectable field of view and the area of ​​interest; The area of ​​interest is A×B, which is divided into N=ceil(A / P)×ceil(B / Q) single search ranges. The active remote sensing satellite completes the search of N search ranges in turn according to the mission requirements. The total time required for the satellite to pass over the top is N×t. Where A represents the length of the area of ​​interest parallel to the direction of the satellite trajectory; B represents the length of the area of ​​interest perpendicular to the direction of the satellite track; P represents the single search range of the active remote sensing satellite in azimuth; Q represents the single search range of the active remote sensing satellite in the range direction; ceil() means rounding up a decimal value; t represents the time taken for each search range.

4. The method for continuously updating the track of a large-scale moving target of an active remote sensing satellite according to claim 1, It is characterized in that In step S3, when the target enters the overlapping range of the detectable field of view, the position information of the target is transmitted via the intersatellite link; The active remote sensing satellite immediately tracks the target and processes the target's position information after receiving the tracking mission requirement information; In step S4, multiple active remote sensing satellites are networked to continuously detect the area under the detectable field of view, and can continuously track multiple targets and quickly update the track; The detection search interval time is less than a single search range divided by the moving target speed.

5. A continuous track update system for active remote sensing satellites with large-scale moving targets, It is characterized in that include: Module M1: Active remote sensing satellites conduct time-based and regional searches of the area of ​​interest based on mission requirements; Module M2: After searching and finding the target, the search and tracking working mode is adopted; Among them, when passing the top, the module M1 to the module M2 are repeatedly triggered until the task requirement is completed and stopped; Module M3: Active remote sensing satellites with overlapping fields of view can be used to transmit and relay target location information; Module M4: Active remote sensing satellite networking; The over-the-top refers to the projection of the satellite on the celestial sphere coinciding with the zenith.

6. The track continuous updating system of active remote sensing satellite large-scale moving target according to claim 5, It is characterized in that In the module M1, the area of ​​interest is divided into a plurality of set areas according to a single search range of the active remote sensing satellite; When the active remote sensing satellite passes overhead, multiple areas are searched in sequence according to the mission requirements; In the module M2, a target is found during the active remote sensing satellite search process, and the target is tracked immediately; The search and track working mode is to track multiple targets within the area of ​​interest while searching.

7. The track continuous updating system of active remote sensing satellite large-scale moving target according to claim 5, It is characterized in that The active remote sensing satellite completes search, discovery and tracking of multiple targets when passing overhead based on the relative positional relationship between the detectable field of view and the area of ​​interest; The area of ​​interest is A×B, which is divided into N=ceil(A / P)×ceil(B / Q) single search ranges. The active remote sensing satellite completes the search of N search ranges in turn according to the mission requirements. The total time required for the satellite to pass over the top is N×t. Where A represents the length of the area of ​​interest parallel to the direction of the satellite trajectory; B represents the length of the area of ​​interest perpendicular to the direction of the satellite track; P represents the single search range of the active remote sensing satellite in azimuth; Q represents the single search range of the active remote sensing satellite in the range direction; ceil() means rounding up a decimal value; t represents the time taken for each search range.

8. The track continuous updating system of active remote sensing satellite large-scale moving target according to claim 5, It is characterized in that In the module M3, when the target enters the overlapping range of the detectable field of view, the position information of the target is transmitted through the intersatellite link; After receiving the tracking mission requirement information, the active remote sensing satellite immediately tracks the target and processes the target's location information; The multiple active remote sensing satellites in the module M4 are networked to continuously detect the area under the detectable field of view, and can continuously track multiple targets and quickly update the track; The detection search interval time is less than a single search range divided by the moving target speed.

9. A computer-readable storage medium storing a computer program, It is characterized in that When the computer program is executed by a processor, the steps of the method for continuously updating the track of a large-scale moving target of an active remote sensing satellite as described in any one of claims 1 to 4 are implemented.

10. A satellite system, It is characterized in that A system for continuously updating the track of a large-scale moving target of an active remote sensing satellite comprising any one of claims 5 to 8, or a computer-readable storage medium storing a computer program as claimed in claim 9.

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