Zero deflection band based star sensor ground surface calibration method

A technology of star sensor and calibration method, applied in the field of aerospace measurement, can solve the problems of coupling of internal and external parameters, large amount of calculation, etc.

Inactive Publication Date: 2007-08-08
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

The problems of the above method are: (1) the amount of calculation is large
(2) There is a coupling phenomenon between internal and external parameters

Method used

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  • Zero deflection band based star sensor ground surface calibration method
  • Zero deflection band based star sensor ground surface calibration method
  • Zero deflection band based star sensor ground surface calibration method

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Embodiment Construction

[0079] The present invention will be described in further detail below.

[0080] No bias band definition.

[0081] According to research, when sampling with the dot-matrix sampling method as shown in Figure 2, there is an area on the target surface that is not sensitive to external installation deviations, which is called the "no-deviation zone", and the data deviation in this area is smaller than the noise level . As shown in Figure 3, the schematic diagram of the sampling deviation of the star sensor after the pitch and yaw deviation occurs on the 2-dimensional turntable.

[0082] It can be seen that at y=0, the estimated deviation along the x direction is small, usually less than the level of the sampling noise. This is because the rotation of the outer frame of the 2-dimensional turntable belongs to the rotation of the fixed axis (the rotation axis of the inner frame of the turntable will rotate with the rotation of the outer frame), when the inner frame is at 0 position...

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Abstract

The invention is a space measurement technology, involving the improvement to the star sensor calibration method. The invention uses the calibration system which comprising the air cushion platform, single star starlight simulator, star sensor, two-dimensional axial turntable and data processing computer, and its steps are: 1. establish the star sensor imaging model; 2. parameters calibrating. The invention uses no deviation strip to calibration focus and radial distortion coefficient, eliminating the internal parameter estimation effect by the external installation error; the method has simple model and small computing volume, particularly applied to the star sensor calibration based on radial distortion.

Description

technical field [0001] The aerospace measurement technology of the invention relates to the improvement of the star sensor calibration method. Background technique [0002] The star sensor is an aerospace measurement instrument that uses star observation to provide high-precision attitude information for spacecraft. Its working principle is: the front-end camera unit of the star sensor uses the CCD (or CMOS) image sensor to capture the star map image, and obtains the barycenter coordinates and brightness information of the star image point through the image processing program, and then the star map recognition program uses these information in the Find the corresponding star in the navigation star library, and finally calculate the three-axis attitude of the star sensor. Before the star sensor is put into use, its internal parameters such as principal point, focal length and distortion coefficient must be accurately measured, which is called star sensor calibration. There ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/00G01B11/02B64G3/00
Inventor 张广军郝雪涛江洁
Owner BEIHANG UNIV
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