On-orbit noise autonomous restraint method for APS star sensor

Abstract

The invention discloses an on-orbit noise autonomous restraint method for an APS star sensor, and is applied before pixel traverse and star point extraction are conducted on a forecast window. Firstly, IIR self-adapting filter processing is conducted on the externally coated circle of pixel of the forecast window; the fixed mode noise correction of pixel gray level is calculated for later use; then whether the pixel in the precast window is corrected or not is defined; when the pixel in the precast window is corrected, the correction of the pixel is written into a corresponding position of a mold plate; when the pixel in the precast window is not corrected, the original gray level of the pixel in the precast window is compared with corresponding correction to obtain a corrected gray level; and then the pixel traverse and the star point extraction are conducted on the window according to the corrected pixel. The method has the advantages that no hardware resource is occupied; the method is realized by software; no ground calibration is required; and the real-time performance and the autonomy are high.

Description

technical field [0001] The present invention relates to a kind of on-orbit noise autonomous suppressing method of APS star sensor, can realize the self-adaptive compensation of the space domain noise of star sensor on the star, mainly when the angular velocity of satellite is small (the angular velocity converted into star sensor must be less than 0.039° / s ) is used. Background technique [0002] The APS star sensor is an important attitude determination device for satellites. The factors affecting the attitude determination accuracy of the APS star sensor include image noise, the number of recognized navigation stars, single-satellite positioning accuracy, and centroid extraction accuracy. Among them, image noise is the bottom-level influencing factor, which determines the quality of other factors to some extent. APS star-sensitive image noise includes spatial noise and temporal noise, where spatial noise includes: fixed pattern noise, dark current inconsistency, and white...

AI Technical Summary

Problems solved by technology

This method can only maintain the on-orbit performance of the APS star sensor for a period of time, but as the temperature changes and the on-orbit time goes by, the performance of the imaging chip further declines, and the parameters further deteriorate, resulting in the previously updated calibration parameters gradually failing to meet Measurement Accuracy Requirements

Both ground calibration and on-orbit parameter calibration require a long time and cost, and are not real-time. In addition, on-orbit transmission and injection require the cooperation of multiple subsystems. The operation is more complicated and has certain risks.

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