Star sensor calibrating method based on star field

Abstract

A calibration method based on star field for the star-sensitive sensor includes such steps as creating a posture conversion array of star-sensitive sensor, creating the distortion model of star-sensitive sensor, and eliminating the least square parameters.

Description

technical field [0001] The invention belongs to aerospace measurement technology, and relates to the improvement of a 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. [0003] Star sensor calibration is generally divided into two methods: ground calibration and on-orbit calibration. Before the launch of the aircraft, the star sensor must first be calibrated and t...

AI Technical Summary

Problems solved by technology

The first disadvantage of this method is that the 0th-order term is lost due to the star-vector subtraction, which makes the error fitting incomplete; the second disadvantage is that the algorithm has a strong dependence on the modeling method of the 2-dimensional polynomial, and the model If it is not good, the numerical calculation will be unstable, and the error will be large

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