Agile imaging satellite linear scan strip pre-generating method based on point target and satellite three-axis gesture rapid determining method

A technology for scanning and imaging satellites in a straight line, applied in the direction of integrated navigators, etc., can solve the problems of reducing mission planning performance, ignoring satellite yaw maneuverability, and unable to consider agile satellite push-broom imaging mode in mission planning, etc.

Inactive Publication Date: 2013-06-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that there is no method for generating straight-line scanning strips in the field of satellite imaging planning in the prior art, and in the existing method of determining the satellite attitude by two-axis attitude calculation, due to the neglect of the yaw maneuverability of the satellite, it is impossible to solve the problem. Considering the push-broom imaging mode that can be achieved by agile satellites in mission planning, and then reducing the problem of mission planning performance, a point-target-based agile imaging satellite linear scanning strip pre-generation method and a fast three-axis attitude determination method are proposed

Method used

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  • Agile imaging satellite linear scan strip pre-generating method based on point target and satellite three-axis gesture rapid determining method
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  • Agile imaging satellite linear scan strip pre-generating method based on point target and satellite three-axis gesture rapid determining method

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specific Embodiment approach 1

[0018] Specific implementation mode one: see figure 1 with figure 2 Describe this embodiment, the method for pre-generating the linear scanning strips of the agile imaging satellite based on the point target described in this embodiment, the specific process of the method is:

[0019] Step A1, screening point targets, using the screened point targets as target points to be observed;

[0020] Step A2, using the optimized Gaussian projection formula to map the longitude and latitude of each target point to be observed Converted to plane Cartesian coordinates (x i ,y i );

[0021] Step A3, adopt the plane Cartesian coordinates (x i ,y i ), the optimization calculation is performed according to the fmincon function in matlab. When the optimization calculation is effective, a linear scanning strip with a width of d is obtained, otherwise, the pre-generation of the linear scanning strip is invalid.

[0022] In this embodiment, the situation that the pre-generation of the li...

specific Embodiment approach 2

[0024] Specific embodiment 2: This embodiment is a further limitation of the point target-based agile imaging satellite linear scanning strip pre-generation method described in specific embodiment 1. In the step A1, point targets are screened, and the screened point targets are The method as the target point to be observed is: select a group of point targets whose maximum longitude difference between point targets does not exceed 9 as the target point to be observed.

specific Embodiment approach 3

[0025] Specific embodiment three: This embodiment is a further limitation of the method for pre-generation of agile imaging satellite linear scan strips based on point targets described in specific embodiment one. In the step A2, each to-be Longitude and latitude of observation target point Converted to plane Cartesian coordinates (x i ,y i ) method is:

[0026] according to Solve to obtain the transformed plane Cartesian coordinates (x i ,y i ),

[0027] In the formula: C i0 、C i3 、C i4 、C i5 、C i6 , N i , l i is an intermediate variable, where

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034] l i = λ di - λ max + λ min 2 ,

[0035] lambda max is the maximum longitude value of...

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Abstract

The invention provides an agile imaging satellite linear scan strip pre-generating method based on a point target and a satellite three-axis gesture rapid determining method, relates to the field of spacecraft imaging mission planning, and aims to solve the problems that related linear push scanning strip generating methods do not exist in the area of satellite imaging planning in the prior art, push scanning imaging mode realized by agile satellite can not be considered in target planning caused by ignorance of satellite yaw motor performance in an existing satellite gesture determining method with two-axis gesture calculation, and thereby target planning performance is lowered. Geodetic longitude and latitude of each target point to be observed are converted into plane right angle coordinates through screening point target, calculation is optimized, linear scan strips are obtained, and then new target points corresponding to the target points to be observed are determined through the obtained linear scan strips. Corresponding geodetic coordinates of each new target point are calculated, parameters of satellite three-axis gesture are calculated, and the satellite three-axis gesture is determined. The agile imaging satellite linear scan strip pre-generating method based on the point target and the satellite three-axis gesture rapid determining method are suitable for satellite imaging target planning.

Description

technical field [0001] The invention relates to the field of spacecraft imaging mission planning. Background technique [0002] At present, in the field of satellite imaging mission planning using linear array CCD cameras in China, non-agile satellites are mostly used for imaging mission planning research. For non-agile satellites, satellites can only achieve lateral attitude maneuvers along the flight trajectory, which greatly limits the imaging capabilities of satellites. . For agile imaging satellites, the satellites can achieve three-axis attitude maneuvering. Foreign research on its mission planning has begun, but domestically it started relatively late and the research content is limited. Most agile satellite attitude determination methods are two-axis attitude calculations, that is, the yaw angle is zero. In this way, the yaw maneuvering performance of the satellite is ignored, so that the push-broom imaging mode that the agile satellite can achieve cannot be consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/24
Inventor 林晓辉潘小彤张锦绣杨云刚罗红吉李太平张健袁勤岳程斐
Owner HARBIN INST OF TECH
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