A rapid imager observation area planning system for geostationary satellites

Abstract

The present application provides a system for observing area planning of a geostationary orbit satellite rapid imager, which relates to the field of satellite communication technology and includes a sub-system for area planning requirements, a sub-system for judging the area range of the rapid imager, and a multi-stage cumulative area planning sub-system. The sub-system for area planning requirements uses the observation time of a unit observation area, the observation latitude range of a unit observation area, and the observation longitude range of a unit observation area as area planning parameters. The sub-system for judging the area range of the rapid imager determines the size of the unit observation area. The multi-stage cumulative area planning sub-system conducts multiple area planning on the observation field of the rapid imager by setting the sub-satellite point at different positions in the unit observation area and generates relevant data, so as to realize the multi-stage cumulative area planning of the observation field. This system can complete area planning according to customer requirements and provide an observation area data basis for generating observation tasks for the satellite rapid imager.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite communication, and particularly to an observation area planning system for a geostationary satellite rapid imager. Background Art

[0002] Existing satellites achieve earth observation through a rapid imager. The main purpose of the rapid imager is to achieve higher spatial and temporal resolution imaging capabilities for the earth observation area in the geostationary orbit. High-frequency earth-atmosphere target observation data can achieve good observation and monitoring of rapidly changing extreme weather such as typhoons and severe convections, which has important guiding significance for forecasters to predict weather changes and improve meteorological service capabilities. The existing satellite payloads need to regenerate the observation tasks each time for regional observation, and the sizes of the observation areas cannot be completely unified. Although the observation area planning of some satellites can achieve a unified observation range size, when the center point of the observation target is at a corner area of a certain region, the observation will be incomplete. Specifically, when there is only one regional planning mode for satellite observation, it is easy to have the observation area at the corner position of the observation target, resulting in poor observation effects; each new regional planning requires re-planning the observation range, which affects the generation of subsequent products; moreover, each regional planning easily makes the product area sizes different, and the parameters of the satellite product generation system need to be modified each time the regional planning is different. When the satellite needs to perform an emergency observation task according to requirements, it is necessary to recompile the task schedule, and in order to match the corresponding emergency observation target range, the time-consuming for generating the satellite task schedule is further increased, resulting in too long an emergency observation response time.

[0003] It can be seen that in order to make the earth observation satellite play a better role, the task planning technology is particularly crucial, and the observation area planning, which plays an important role in task planning, needs to be further optimized to better schedule the observation tasks to be executed, match resources, and determine the working time domain, spatial domain, and mode of the satellite and its payload, and then formulate a detailed work plan in sequence to drive the satellite resources to execute tasks scientifically and efficiently.

[0004] Therefore, in order to meet the generation of geostationary satellite observation tasks, it is necessary to develop a system for planning the observation area of a satellite rapid imager, which can complete automatic area planning at any time according to customer requirements, and at the same time enable the rapid imager to overcome the defect that the product processing operation pressure suddenly increases due to the continuous change of the observation area size in the normal operation of emergency observation, realize area planning that meets the observation requirements, provide a basis for specifying the observation target, and reasonably planning the observation area of the satellite payload. Summary of the Invention

[0005] In order to solve the problems in existing satellite observations, where it is easy to have incomplete target observations with only one type of observation area planning, and the inconsistent sizes of the planned observation areas result in complex and time-consuming product processing operations, the embodiments of this application provide an observation area planning system for a geostationary satellite rapid imager, which can complete area planning according to customer requirements and provide observation area data basis for generating observation tasks for the satellite rapid imager.

[0006] The technical solution adopted by this application to solve its technical problems is: an observation area planning system for a geostationary satellite rapid imager, which is characterized by including an area planning requirement subsystem, a rapid imager area range judgment subsystem, and a multi-stage cumulative area planning subsystem.

[0007] The area planning requirement subsystem uses the observation time of a unit observation area, the observation latitude range of a unit observation area, and the observation longitude range of a unit observation area as area planning parameters, and selects two of the area planning parameters as judgment parameters.

[0008] The rapid imager area range judgment subsystem takes the unit observation area with the longest observation time as the limit area, and based on meeting the observation task requirements of the limit area, calculates and determines the size of the unit observation area range according to the judgment parameters of the area planning requirement subsystem.

[0009] The multi-stage cumulative area planning subsystem conducts multiple area planning on the observation field of view of the rapid imager by setting the sub-satellite point at different positions in the unit observation area and generating relevant data, realizing multi-stage cumulative area planning of the observation field of view, and providing observation area data basis for generating observation tasks for the satellite rapid imager.

[0010] In a specific implementation, when the judgment parameter includes the observation time of a unit observation area, the range of the unit observation area in the corresponding direction is set with another judgment parameter, and then the range of the other area planning parameter that is not selected as the judgment parameter in the corresponding direction is used as the judgment range. The initial value of the judgment range and the iteration step distance are set, and the limit area is observed continuously for multiple times. The range of the unit observation area in this direction is determined by the judgment range where the observation task time of the limit area is less than the observation time of the unit observation area and does not exceed the set time, so as to determine the size of the unit observation area range.

[0011] In a specific implementation, the sizes of the unit observation areas under different area planning modes are the same, and the adjacent sides of adjacent unit observation areas are flush under the same area planning mode; the observation field of view range of the rapid imager is rectangular, the scanning mirror of the rapid imager starts to move from the sub-satellite point, and the time taken to complete the observation of any unit observation area and then return to the sub-satellite point is the observation time of the unit observation area. The limit area with the longest observation time is the unit observation area located at the corner of the rectangular field of view range.

[0012] In a specific implementation, in the multi-stage cumulative area planning, in each area planning, in accordance with the principle that the row and column numbers of adjacent two unit observation areas do not overlap, with the rectangular size of the unit observation area as the spatial margin, expand to all areas within the observation field of view of the fast imager in the four directions of east, south, west, and north, plan the imaging area of the earth within the observation field of view and part of the space area, and calculate and generate the original area planning data.

[0013] In a specific implementation, the original area planning data includes the starting row number data, ending row number data, starting column number data, ending column number data, center point row number data, and center point column number data of each unit observation area obtained in this area planning mode.

[0014] In a specific implementation, the multi-stage cumulative area planning includes:

[0015] The first-stage cumulative planning module, which includes a center point planning sub-module, a corner point planning sub-module, and a first-stage cumulative planning calculation module. In the center point planning sub-module, the sub-satellite point is set at the center point of the unit observation area for area planning; in the corner point planning sub-module, the sub-satellite point is set at the corner point of the unit observation area for area planning; the original area planning data includes the first-stage area planning original data calculated and generated by the first-stage cumulative planning calculation module;

[0016] The N-stage cumulative planning module, which includes a north-south boundary N-stage planning sub-module, an east-west boundary N-stage planning sub-module, and an N-stage cumulative planning calculation module. In the north-south boundary N-stage planning sub-module, the sub-satellite point is set at the 2 N-1 equal division points of the north-south adjacent boundaries of the unit observation area for area planning; in the east-west boundary N-stage planning sub-module, the sub-satellite point is set at the 2 N-1 equal division points of the east-west adjacent boundaries of the unit observation area for area planning; the original area planning data includes the N-stage area planning original data calculated and generated by the N-stage cumulative planning calculation module, where N = 2, 3,..., Z; Z is selected according to the area planning requirements, and Z is an integer greater than 1;

[0017] The dynamic multi-stage cumulative planning decision-making module, which makes dynamic decisions on the cumulative area planning of each stage according to the area planning requirements of the fast imager, and selects the original area planning data of each stage individually or in a free combination for relevant calculations.

[0018] In a specific implementation, the multi-stage cumulative area planning subsystem further includes a multi-stage cumulative area viewing field boundary calculation subsystem, which calculates the original area planning data obtained from the multi-stage cumulative area planning based on the principle of covering the earth imaging with the minimum number of unit observation areas within the field of view, retains the unit observation areas with the center point and at least two corner points located within the two-dimensional earth image, obtains the multi-stage cumulative area viewing field boundary data, and performs calculation and processing in combination with the original area planning data of each stage obtained in the multi-stage cumulative area planning to generate corresponding multi-stage cumulative planning data.

[0019] In a specific implementation, the multi-stage cumulative area planning subsystem further includes a multi-stage cumulative area planning geographic information calculation subsystem, which uses the nominal projection of the geostationary orbit defined by the global standard, calculates the geographic coordinates based on the CGCS2000 reference ellipsoid, and calculates the longitude and latitude geographic information of the four corner points and the center point of each unit observation area according to the row and column number information of the corner points and the center point of each unit observation area in the multi-stage cumulative planning data. If the corner point or the center point is not within the earth imaging area within the field of view, the coordinates of this point are set to illegal values, thereby obtaining the multi-stage cumulative planning geographic information data.

[0020] In a specific implementation, the multi-stage cumulative area planning subsystem further includes a multi-stage cumulative area planning information recursion subsystem, which includes a regional planning geographic information recursion sub-module, a regional planning naming sub-module, and a regional observation normalization table generation sub-module;

[0021] The regional planning geographic information recursion sub-module recurses into unified regional planning recursion data based on the multi-stage cumulative planning data and the multi-stage cumulative planning geographic information data. The regional planning recursion data includes the regional start row number information, regional end row number information, regional start column number information, regional end column number information, regional center point row number information, regional center point column number information, regional start row number latitude geographic information, regional end row number latitude geographic information, regional start column number longitude geographic information, regional end column number longitude geographic information, regional center point row number latitude geographic information, and regional center point column number longitude geographic information of all planned unit observation areas;

[0022] The regional planning naming sub-module names each unit observation area in sequence one by one based on the regional planning recursion data according to the geographical location of each planned unit observation area, following the principle of from west to east and from north to south, using Arabic numerals, and each unit observation area has a unique number;

[0023] The area observation normalization table generation sub-module generates the area observation normalization table data of the fast imager based on the area planning recursive data and the unit observation area number data. The area observation normalization table data includes the area number data information, area start row number information, area end row number information, area start column number information, area end column number information, area center point row number information, area center point column number information, area start row number latitude geographical information, area end row number latitude geographical information, area start column number longitude geographical information, area end column number longitude geographical information, area center point row number latitude geographical information, and area center point column number longitude geographical information of all planned unit observation areas.

[0024] In a specific implementation, the observation steps of the fast imager for the unit observation area are as follows:

[0025] S1: The pointing position of the fast imager scanning mirror moves from the sub-satellite point position to the starting row and starting column positions of the unit observation area.

[0026] S2: After the fast imager scanning mirror scans from west to east the first row of the unit observation area to the ending column position, it points to the starting column position of the next row and scans from west to east to the ending column position of this row, and loops to scan to the ending row and ending column positions of the unit observation area in this way.

[0027] S3: The pointing position of the fast imager scanning mirror returns to the sub-satellite point to complete one area scan.

[0028] The advantages of the embodiments of this application are:

[0029] 1. Based on the multi-stage cumulative area planning implemented by this system, it solves the problem that only one type of observation area planning in satellite observation makes the target observation incomplete and results in poor observation effects, and enriches the selection of observation areas when the fast imager executes tasks.

[0030] 2. Based on the multi-stage cumulative area planning implemented by this system, regardless of the size of the target observation area, the subsequent product generation system does not need to modify relevant parameters, and only needs to call the relevant data planned by this system during the planning task and the execution task.

[0031] 3. Based on the multi-stage cumulative area planning implemented by this system, according to the principle of the largest spatial margin and the shortest observation time consumption, it plans unit observation areas with a unified size of the observation range, which not only optimizes the area observation mode of the fast imager to facilitate the selection of the target observation range during task planning, but also further improves the observation efficiency and enhances the observation response speed.

[0032] 4. The system uses the observation time of the unit observation area, the observation latitude range of the unit observation area, and the observation longitude range of the unit observation area as the regional planning parameters, provides the corresponding division mode of the unit observation area range, and can meet different actual use requirements; determines the limit area with the longest observation time in the observation field of view of the fast imager, so as to determine the maximum unit observation area range under the condition of meeting the observation duration of each area.

[0033] 5. The multi-order cumulative regional planning of the system can realize regional planning of different orders according to the actual demand level, meet the requirements of different observation range, and in addition, the relevant unit observation area information data obtained under different regional planning modes can be used as the analysis and decision-making basis for satellite mission generation. Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the calculation process of the fast imager area range judgment and research sub-system of a fast imager observation area planning system based on a geostationary satellite according to the present invention;

[0035] Figure 2 It is a schematic diagram of the movement trajectory of the fast imager scanning mirror of a fast imager observation area planning system based on a geostationary satellite according to the present invention;

[0036] Figure 3 It is a schematic diagram of the generation of the fast imager area observation task of a fast imager observation area planning system based on a geostationary satellite according to the present invention. Detailed Embodiment

[0037] By providing a fast imager observation area planning system based on a geostationary satellite, the embodiments of the present application solve the problems that in the existing satellite observation, only one kind of observation area planning is prone to incomplete target observation, and the size of the observation area planning is not uniform, resulting in complicated product processing operations and long time consumption. The general idea is as follows:

[0038] The present invention provides a system for observing area planning of a geostationary satellite fast imager, including an area planning requirement subsystem, a fast imager area range judgment subsystem, and a multi-stage cumulative area planning subsystem. The area planning requirement subsystem uses the observation time of a unit observation area, the observation latitude range of a unit observation area, and the observation longitude range of a unit observation area as area planning parameters, and selects two of the area planning parameters as judgment parameters; the fast imager area range judgment subsystem takes the unit observation area with the longest observation time as the limit area, and based on meeting the observation task requirements of the limit area, calculates and determines the size of the unit observation area according to the judgment parameters of the area planning requirement subsystem; the multi-stage cumulative area planning subsystem conducts multiple area planning on the observation field of view of the fast imager by setting the sub-satellite point at different positions in the unit observation area and generates relevant data, realizing the multi-stage cumulative area planning of the observation field of view, and providing an observation area data basis for the satellite fast imager to generate observation tasks. This system uses two of the three parameters of the observation time of a unit observation area, the observation latitude range of a unit observation area, and the observation longitude range of a unit observation area as the basis for determining the size of the unit observation area. Since the position of the sub-satellite point of the geostationary satellite is determined, by setting the relative position between the sub-satellite point and the unit observation area where it is located to change, multiple area plans are formed and relevant data are generated, facilitating the fast imager to select the corresponding unit observation area obtained from the area plan according to the characteristics of the target area to be observed when performing tasks.

[0039] When the judgment parameters are the observation latitude range of a unit observation area and the observation longitude range of a unit observation area, the size of the unit observation area is calculated and determined according to the latitude range and longitude range. When the judgment parameters include the observation time of a unit observation area, the range of the unit observation area in the corresponding direction is set with the other judgment parameter, and then the range of the other area planning parameter that is not selected as the judgment parameter in the corresponding direction is used as the judgment range. The initial value of the judgment range and the iteration step distance are set, and the limit area is observed continuously for multiple times. The range of the unit observation area in this direction is determined by the judgment range where the observation task time of the limit area is less than the observation time of the unit observation area and does not exceed the set time. Specifically, in this embodiment, the judgment parameters are the observation time of a unit observation area and the observation latitude range of a unit observation area. The judgment method of the fast imager area range judgment subsystem is as follows: the north-south range of the unit observation area is set with the observation latitude range of the unit observation area; the initial east-west observation range and the iteration step distance are set, and the limit area is observed continuously for multiple times. The east-west range of the unit observation area is determined by the east-west range where the observation task time of the limit area is less than the observation time of the unit observation area and does not exceed the set time t. The steps are as follows:

[0040] S1: Determine the north-south observation range;

[0041] S2: Given the initial range in the east-west direction;

[0042] S3: Determine the coordinates of the limit area according to the north-south range and the east-west range;

[0043] S4: Continuously calculate the observation task time of the limit area;

[0044] S5: Determine whether one of the observation task times of the limit area in two adjacent times exceeds the time limit and the other does not exceed the time limit compared with the observation time of the unit observation area. If only one time exceeds the time limit, based on the north-south range and the east-west range of the limit area in the case of not exceeding the time limit, go to step S8; otherwise, go to the next step;

[0045] S6: Determine whether both of the observation task times of the limit area in two adjacent times exceed the time limit compared with the observation time of the unit observation area. If they exceed the time limit, reduce the east-west observation range and go to step S3; if neither exceeds the time limit, go to the next step;

[0046] S7: Determine whether the time difference between the observation task times of the limit area in two adjacent times is less than t compared with the observation time of the unit observation area. If it is not less than t, increase the east-west observation range and go to step S3; if it is less than t, go to the next step;

[0047] S8: Determine the limit area range and use it as the unit observation area range.

[0048] When the set time t is 5s, the judgment process of the fast imager area range can be referred to as Figure 1 shown.

[0049] In this example, the size of the unit observation area is the same under different area planning modes, and the adjacent sides of adjacent unit observation areas are flush under the same area planning mode; the observation field of view range of the fast imager is rectangular, the scanning mirror of the fast imager starts to move from the sub-satellite point, and the time taken to complete the observation of any unit observation area and then return to the sub-satellite point is the observation time of the unit observation area. In this case, the limit area with the longest observation time is the unit observation area located at the corner of the rectangular field of view range. Specifically, please refer to Figure 2 , the observation steps of the fast imager for the unit observation area are as follows:

[0050] S1: The pointing position of the fast imager scanning mirror moves from the sub-satellite point position to the starting row and starting column positions of the unit observation area;

[0051] S2: After the fast imager scanning mirror scans from west to east the first row to the end column position of the unit observation area, it points to the starting column position of the next row and scans from west to east to the end column position of this row, and loops to scan to the end row and end column positions of the unit observation area;

[0052] S3: The pointing position of the fast imager scanning mirror returns to the sub-satellite point, completing one regional scan.

[0053] In multi-order cumulative regional planning, in each regional planning, in accordance with the principle that the row and column numbers of adjacent two unit observation regions do not overlap, with the rectangular size of the unit observation region as the spatial margin, expand to all regions within the observation field of view of the fast imager in the four directions of east, south, west, and north, plan the imaging regions of the Earth and part of the space region within the observation field of view, and calculate and generate the original data of regional planning. The original data of regional planning includes the starting row number data, ending row number data, starting column number data, ending column number data, central point row number data, and central point column number data of each unit observation region obtained under this regional planning mode.

[0054] The multi-order cumulative regional planning includes a first-order cumulative planning module, an N-order cumulative planning module, and a dynamic multi-order cumulative planning decision module. The first-order cumulative planning module includes a central point planning sub-module, a corner point planning sub-module, and a first-order cumulative planning calculation module; in the central point planning sub-module, the sub-satellite point is set at the central point of the unit observation region for regional planning; in the corner point planning sub-module, the sub-satellite point is set at the corner point of the unit observation region for regional planning; the original data of regional planning includes the original data of the first-order regional planning calculated and generated by the first-order cumulative planning calculation module. The N-order cumulative planning module includes a north-south boundary N-order planning sub-module, an east-west boundary N-order planning sub-module, and an N-order cumulative planning calculation module; in the north-south boundary N-order planning sub-module, the sub-satellite point is set at the 2 N-1 equal division points of the north-south adjacent boundaries of the unit observation region for regional planning; in the east-west boundary N-order planning sub-module, the sub-satellite point is set at the 2 N-1Regional planning is performed at the equally divided points; the regional planning raw data includes N-order regional planning raw data calculated and generated by an N-order cumulative planning calculation module, where N=2, 3, ..., Z; Z is selected according to the needs of regional planning, where N is an integer greater than 1. It should be pointed out that when only first-order cumulative planning is required according to regional planning needs, Z may not be selected, and the planning module of the multi-order cumulative regional planning only includes the first-order cumulative planning module; when second-order cumulative planning is required according to regional planning needs, Z may be selected as 2, and the planning module of the multi-order cumulative regional planning includes the first-order cumulative planning module and the second-order cumulative planning module; specifically, the second-order cumulative planning module includes a north-south boundary center point planning sub-module, an east-west boundary center point planning sub-module, and a second-order cumulative planning calculation module; in the north-south boundary center point planning sub-module, the sub-satellite point is set at the north-south adjacent boundary center point of the unit observation area for regional planning; in the east-west boundary center point planning sub-module, the sub-satellite point is set at the east-west adjacent boundary center point of the unit observation area for regional planning; the regional planning original data includes the second-order regional planning original data calculated and generated by the second-order cumulative planning calculation module. Therefore, when Z takes a larger integer, it can be deduced by analogy. According to user needs, based on the first-order cumulative planning and the second-order cumulative planning, the sub-satellite point is taken as the reference point, and the sub-satellite point is set at 1 / 4, 1 / 8, 1 / 16, ..., of the adjacent boundaries of the unit observation area where it is located and the adjacent unit observation area, and multiple pyramid structure cumulative regional planning is performed respectively. Based on the original regional planning data, sustainable multi-order iterative regional planning is realized, and the pyramid structure exhaustive planning rectangular observation area is obtained. The dynamic multi-order cumulative planning decision module makes dynamic decisions for the cumulative regional planning of each order according to the regional planning requirements of the rapid imager, and selects the original regional planning data of each order individually or in free combination for relevant calculations.

[0055] The multi-order cumulative regional planning subsystem also includes a multi-order cumulative regional observation domain boundary calculation subsystem, which is based on the planning principle of covering the earth imaging with the minimum number of unit observation areas within the field of view, and takes the payload field of view as the center, and calculates the regional planning original data obtained by the multi-order cumulative regional planning, wherein the multi-order cumulative planning includes first-order cumulative planning and second-order cumulative planning. For the area after the combination of the first-order regional planning original data, the second-order regional planning original data, the N-order regional planning original data, etc., the unit observation area whose center point and at least two corner points are located in the two-dimensional image of the earth is retained to obtain the multi-order cumulative regional observation domain boundary data, and the original data of each order of regional planning obtained in the multi-order cumulative regional planning are combined for calculation and processing to generate corresponding multi-order cumulative planning data, and the multi-order cumulative planning data includes the first-order cumulative planning data, the second-order cumulative planning data, and the N-order cumulative planning data.

[0056] The multi-stage cumulative area planning subsystem also includes a multi-stage cumulative area planning geographic information calculation subsystem, which uses the nominal projection of the geostationary orbit defined by global specifications. The geographic coordinates are calculated based on the CGCS2000 reference ellipsoid. According to the row and column numbers of the corner points and the center point of each unit observation area in the multi-stage cumulative planning data, the longitude and latitude geographic information of the four corner points and the center point of each unit observation area is calculated. If the corner point or the center point is not within the Earth imaging area of the field of view, the coordinates of this point are set to illegal values, thus obtaining the multi-stage cumulative planning geographic information data. Specifically, in this example, the multi-stage cumulative area planning geographic information calculation subsystem includes a first-stage cumulative planning geographic information calculation module, a second-stage cumulative planning geographic information calculation module, and an N-stage cumulative planning geographic information calculation module. The first-stage cumulative planning geographic information calculation module calculates and generates the first-stage cumulative planning geographic information data one by one according to the row and column number range of the first-stage cumulative planning. The first-stage cumulative planning geographic information data includes the starting row number latitude geographic information, the ending row number latitude geographic information, the starting column number longitude geographic information, the ending column number longitude geographic information, the center point row number latitude geographic information, and the center point column number longitude geographic information of each area in the first-stage cumulative planning. The second-stage cumulative planning geographic information calculation module calculates and generates the second-stage cumulative planning geographic information data. The second-stage cumulative planning geographic information data includes the starting row number latitude geographic information, the ending row number latitude geographic information, the starting column number longitude geographic information, the ending column number longitude geographic information, the center point row number latitude geographic information, and the center point column number longitude geographic information of each area in the second-stage cumulative planning. The N-stage cumulative planning geographic information calculation module calculates and generates the N-stage cumulative planning geographic information data. The N-stage cumulative planning geographic information data includes the starting row number latitude geographic information, the ending row number latitude geographic information, the starting column number longitude geographic information, the ending column number longitude geographic information, the center point row number latitude geographic information, and the center point column number longitude geographic information of each area in the N-stage cumulative planning.

[0057] The multi-stage cumulative area planning subsystem also includes a multi-stage cumulative area planning information recursion subsystem, which includes a regional planning geographic information recursion sub-module, a regional planning naming sub-module, and a regional observation normalization table generation sub-module.

[0058] The regional planning geographic information recursive sub-module is based on multi-level cumulative planning data and multi-level cumulative planning geographic information data, and is recursively formed into unified regional planning recursive data. The regional planning recursive data includes the regional starting row number information, regional ending row number information, regional starting column number information, regional ending column number information, regional center point row number information, regional center point column number information, regional starting row number latitude geographic information, regional ending row number latitude geographic information, regional starting column number longitude geographic information, regional ending column number longitude geographic information, regional center point row number latitude geographic information, and regional center point column number longitude geographic information of all planned unit observation regions.

[0059] The regional planning naming sub-module is based on the regional planning recursive data. According to the geographical location of each planned unit observation region, following the principle of from west to east and from north to south, Arabic numerals are used to name each region in sequence, and each unit observation region has a unique number.

[0060] The regional observation normalization table generation sub-module is based on the regional planning recursive data and the unit observation region number data to generate the fast imager regional observation normalization table data. The regional observation normalization table data includes the regional number data information, regional starting row number information, regional ending row number information, regional starting column number information, regional ending column number information, regional center point row number information, regional center point column number information, regional starting row number latitude geographic information, regional ending row number latitude geographic information, regional starting column number longitude geographic information, regional ending column number longitude geographic information, regional center point row number latitude geographic information, and regional center point column number longitude geographic information of all planned unit observation regions.

[0061] Please refer to Figure 3 , when the fast imager generates a regional observation task, according to the relevant information in the regional observation normalization table data, it generates the corresponding unit area observation task. After inputting the longitude and latitude of the observation task requirements, it extracts the area lookup table containing the regional observation normalization table data, calculates the observation area that meets the task, finds the longitude, latitude and row-column number coordinate information of the corresponding planned area, and performs observations according to the row-column number information in the regional observation normalization table data. The task information generated by the fast imager region should include the task execution start time, task execution end time, task observation area start row-column number position, task observation area end row-column number position, task observation area mode (the scanning lens observation speed is different in different modes, for example, the scanning lens scanning speed can be 0.128° / s, 0.256° / s, 0.512° / s, 1.024° / s respectively), the position where the scanning mirror returns after the task ends, etc.

[0062] In summary, through the regional planning requirements subsystem, the fast imager regional range judgment subsystem, and the multi-stage cumulative regional planning subsystem, the present invention conducts various regional planning on the observation field of view of the fast imager according to customer requirements and generates relevant data, providing an observational area data basis for generating observation tasks for the satellite fast imager, and solving the problems in the existing geostationary satellite observations that only one type of observational area planning is prone to incomplete target observation, and the inconsistent sizes of the observational area planning result in complicated product processing operations and long time consumption.

[0063] Finally, it should be noted that: Obviously, the above embodiments are merely examples for clearly illustrating the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A system for observing area planning of a geostationary satellite fast imager, which is used to plan the observation field of view of the satellite fast imager for the Earth into multiple rectangular unit observation areas, and is characterized in that, Including: A regional planning requirements subsystem, which uses the observation time of a unit observation area, the observation latitude range of a unit observation area, and the observation longitude range of a unit observation area as regional planning parameters, and selects two of the regional planning parameters as judgment parameters; A fast imager regional range judgment subsystem, which takes the unit observation area with the longest observation time as the limit area, and based on meeting the observation task requirements of the limit area, calculates and determines the size of the unit observation area according to the judgment parameters of the regional planning requirements subsystem; And A multi-order cumulative regional planning subsystem, which conducts multiple regional planning on the observation field of view of the fast imager by setting the sub-satellite point at different positions in the unit observation area and generates relevant data, realizing the multi-order cumulative regional planning of the observation field of view, and providing an observation area data basis for generating observation tasks for the satellite fast imager; Among them, the size of the unit observation area is the same under different regional planning modes, and the adjacent sides of adjacent unit observation areas are flush under the same regional planning mode; the observation field of view of the fast imager is rectangular, and the scanning mirror of the fast imager starts to move from the sub-satellite point, completes the observation of any unit observation area, and then returns to the sub-satellite point. The elapsed time is the observation time of the unit observation area. The limit area with the longest observation time is the unit observation area located at the corner of the rectangular field of view; In the multi-order cumulative regional planning, in each regional planning, in accordance with the principle that the row and column numbers of adjacent two unit observation areas do not overlap, with the rectangular size of the unit observation area as the spatial margin, expand to all areas within the observation field of view of the fast imager in the four directions of east, south, west, and north, plan the imaging area of the earth and part of the space area within the observation field of view, and calculate and generate the original regional planning data; The original regional planning data includes the starting row number data, ending row number data, starting column number data, ending column number data, center point row number data, and center point column number data of each unit observation area obtained under this regional planning mode.

2. The observation area planning system of a geostationary orbit satellite rapid imager according to claim 1, characterized in that, When the judgment parameter includes the observation time of the unit observation area, set the range of the unit observation area in the corresponding direction with another judgment parameter, and then use the range of the other regional planning parameter not selected as the judgment parameter in the corresponding direction as the judgment range, set the initial value of the judgment range and the iterative step distance, continuously observe the limit area multiple times, and take the judgment range where the observation task time of the limit area is less than the observation time of the unit observation area and does not exceed the set time as the range of the unit observation area in this direction, so as to determine the size of the unit observation area.

3. The observation area planning system for a geostationary orbit satellite fast imager according to claim 1, wherein The multi-order cumulative regional planning includes: A first-order cumulative planning module, which includes a center point planning sub-module, a corner point planning sub-module, and a first-order cumulative planning calculation module. In the center point planning sub-module, the sub-satellite point is set at the center point of the unit observation area for regional planning; in the corner point planning sub-module, the sub-satellite point is set at the corner point of the unit observation area for regional planning; the original regional planning data includes the first-order regional planning original data calculated and generated by the first-order cumulative planning calculation module; N - order cumulative planning module, which includes north - south boundary N - order planning sub - module, east - west boundary N - order planning sub - module, and N - order cumulative planning calculation module. In the north - south boundary N - order planning sub - module, the sub - satellite point is set at the 2 N-1 equidistant points of the north - south adjacent boundaries of the unit observation area for area planning; in the east - west boundary N - order planning sub - module, the sub - satellite point is set at the 2 N-1 equidistant points of the east - west adjacent boundaries of the unit observation area for area planning; the original data of the area planning includes N - order area planning original data calculated by the N - order cumulative planning calculation module, where N = 2, 3,..., Z; Z is selected according to the needs of area planning, and Z is an integer greater than 1; A dynamic multi-stage cumulative planning decision-making module, which makes dynamic decisions on the cumulative area planning of each stage according to the regional planning requirements of the fast imager, and selects the original data of the area planning of each stage individually or freely combined for relevant calculations.

4. The observation area planning system of a geostationary orbit satellite fast imager according to claim 3, wherein The multi-stage cumulative area planning subsystem also includes a multi-stage cumulative area viewing field boundary calculation subsystem, which calculates the original area planning data obtained from the multi-stage cumulative area planning based on the principle of covering the earth imaging with the minimum number of unit observation areas within the field of view, retains the unit observation areas with the center point and at least two corner points within the two-dimensional image of the earth, obtains the multi-stage cumulative area viewing field boundary data, and combines the original area planning data of each stage obtained in the multi-stage cumulative area planning for calculation and processing to generate the corresponding multi-stage cumulative planning data.

5. The observation area planning system for a geostationary orbit satellite rapid imager according to claim 4, characterized in that The multi-stage cumulative area planning subsystem also includes a multi-stage cumulative area planning geographic information calculation subsystem, which uses the nominal projection of the geostationary orbit defined by the global standard, calculates the geographic coordinates based on the CGCS2000 reference ellipsoid, and calculates the longitude and latitude geographic information of the four corner points and the center point of each unit observation area according to the row and column number information of the corner points and the center point of each unit observation area in the multi-stage cumulative planning data. If the corner point or the center point is not within the earth imaging area within the field of view, the coordinates of this point are set to illegal values, so as to obtain the multi-stage cumulative planning geographic information data.

6. The observation area planning system for a geostationary orbit satellite rapid imager according to claim 5, wherein The multi-stage cumulative area planning subsystem also includes a multi-stage cumulative area planning information recursion subsystem, which includes a regional planning geographic information recursion sub-module, a regional planning naming sub-module, and a regional observation normalization table generation sub-module; The regional planning geographic information recursion sub-module recursively forms unified regional planning recursion data based on the multi-stage cumulative planning data and the multi-stage cumulative planning geographic information data. The regional planning recursion data includes the regional start row number information, regional end row number information, regional start column number information, regional end column number information, regional center point row number information, regional center point column number information, regional start row number latitude geographic information, regional end row number latitude geographic information, regional start column number longitude geographic information, regional end column number longitude geographic information, regional center point row number latitude geographic information, and regional center point column number longitude geographic information of all planned unit observation areas; The regional planning naming sub-module names each unit observation area in sequence one by one according to the geographical location of the unit observation area planned one by one based on the principle of from west to east and from north to south using Arabic numerals, and each unit observation area has a unique number; The region observation normalization table generation sub-module generates the fast imager region observation normalization table data based on the region planning recursive data and the unit observation region number data. The region observation normalization table data includes the region number data information, region start row number information, region end row number information, region start column number information, region end column number information, region center point row number information, region center point column number information, region start row number latitude geographical information, region end row number latitude geographical information, region start column number longitude geographical information, region end column number longitude geographical information, region center point row number latitude geographical information, and region center point column number longitude geographical information of all planned unit observation regions.

7. A rapid imager observation area planning system for geostationary satellites according to any one of claims 1-6, characterized in that, The observation steps of the fast imager for the unit observation region are as follows: S1: The pointing position of the fast imager scanning mirror moves from the sub-satellite point position to the start row and start column positions of the unit observation region. S2: After the fast imager scanning mirror scans from west to east the first row of the unit observation region to the end column position, it points to the start column position of the next row and scans from west to east to the end column position of this row, and cycles in this way until the end row and end column positions of the unit observation region are scanned. S3: The pointing position of the fast imager scanning mirror returns to the sub-satellite point to complete one regional scan.

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