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Internal and external element correcting method of star sensor

A technology of a star sensor and a calibration method, applied in the field of aerospace measurement, can solve the problems of calibration method error, affecting the estimation accuracy of the internal parameters of the star sensor, etc.

Inactive Publication Date: 2007-11-14
BEIHANG UNIV
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Problems solved by technology

[0010] Due to the influence of external factors such as these installation alignments, there are errors in the calibration method that only establishes the imaging model for the internal parameters of the star sensor, which ultimately affects the estimation accuracy of the internal parameters of the star sensor

Method used

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  • Internal and external element correcting method of star sensor
  • Internal and external element correcting method of star sensor
  • Internal and external element correcting method of star sensor

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Embodiment Construction

[0104] The present invention will be described in further detail below. The invention proposes a joint modeling method for the internal parameters and external parameters of the star sensor calibration system, and uses the nonlinear least square method and collinear formula to iteratively calculate the internal parameters and external parameters of the star sensor calibration system. This method can separate the internal parameters and external parameters of the star sensor calibration system, making the final internal parameters of the star sensor more accurate. At the same time, the external world coordinate system of the star sensor calibration system is established in the calibration process, so that the star sensor coordinate system can be easily drawn to the optical cube coordinate system that is fixedly connected with the star sensor, and it will be used for future star sensor installation. Orientation measurements while on board the spacecraft provide the basis. The s...

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Abstract

The invention relates to star sensor calibration method improvement. It is based on the calibration system includes hover-platform, single star starlight simulator, star sensor, two dimension axial turning table, data processing machine. It includes the following steps: calibrating system modeling, collecting data, and processing data. The invention adopts whole modeling method to avoid affecting parameter calibration accuracy caused by inducting external parameter deviation to inner in estimating process. The method can reduce complex star sensor installing aligning in calibrating process to satisfy the whole calibration process.

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 Patents(China)
IPC IPC(8): G01V13/00
Inventor 张广军郝雪涛江洁
Owner BEIHANG UNIV
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