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Internal and external element correcting method of star sensor

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

Inactive Publication Date: 2007-04-18
BEIHANG UNIV
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  • Description
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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

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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

[0095] The present invention will be described in further detail below. The present invention proposes a method for jointly modeling the internal parameters and external parameters of the star sensor calibration system, and uses the nonlinear least square method and the collinearity 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, so that the final internal parameters of the star sensor are more accurate. At the same time, the external world coordinate system of the star sensor calibration system is established during the calibration process, so that the star sensor coordinate system can be easily derived to the optical cube coordinate system fixed with the star sensor for future star sensor installation The azimuth measurement on board the spacecraft provides the basis. The steps of the method of the...

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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 present invention relates to the improvement of the calibration method of the star sensor. Background technique [0002] The star sensor is an aerospace measuring instrument that uses star observations to provide high-precision attitude information for space vehicles. Its working principle is: the front-end camera unit of the star sensor uses the CCD (or CMOS) image sensor to capture the star image, and obtains the centroid coordinates and brightness information of the star image through the image processing program, and then the star image recognition program uses this information in Find the corresponding star in the navigation star database, and finally calculate the three-axis attitude of the star sensor. Before the star sensor is put into use, its principal point, focal length, and distortion coefficient must be accurately measured, which is called star sensor calibration. There are several methods for calibr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V13/00
Inventor 张广军郝雪涛江洁
Owner BEIHANG UNIV
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