Method for improving dynamic performance of active pixel sensor (APS) star sensor

Abstract

The invention discloses a method for improving the dynamic performance of an active pixel sensor (APS) star sensor. The method comprises the following steps: (1) establishing a dynamic performance analysis model of a star sensor based on parameters such as star energy, clear aperture, quantum efficiency, movement angular speed and signal to noise ratio according to a photoelectric conversion transfer path of starlight, and analyzing and determining dynamic performance parameters such as integral time, sensitivity and star detection probability in a field of view; (2) determining APS integral time according to factors such as the movement angular speed, the field of view, the resolution of an image detector and a star point diffusion function; (3) under the condition that a roller blind shutter of the image detector heavily affects the star diagonal distance of a star map at high movement angular speed, designing a star point position compensation and correction method for a special APS roller blind shutter integral manner; and (4) designing a double-frame star map processing mode of the star sensor, and estimating the angular speed of a spacecraft under the condition of high angular speed according to star point positions of a two-frame star map. By virtue of the method, the dynamic performance of the APS star sensor is improved.

Description

technical field [0001] The invention relates to a design method for improving the dynamic performance of an APS (Active Pixel Sensor) star sensor, which is suitable for the field of star sensors used in space vehicles. Background technique [0002] With the development of space technology, the pointing accuracy of the spacecraft has become more and more demanding. The attitude measurement sensor is an important guarantee for the high precision and high stability of the satellite. The star sensor is one of the important attitude measurement sensors in the satellite control system and has a wide range of applications. It uses the stars in the sky as the observation reference, and is the most accurate attitude measurement sensor at this stage, and its attitude measurement accuracy can reach the arcsecond level or even higher. [0003] Among the star sensors, the APS star sensor is the development trend of the star sensor in the future. The dynamic performance of the star sens...

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Problems solved by technology

[0012] However, none of the above research results on the dynamic performance of the star sensor can reach a satisfactory level. None of them have established an analysis model for the dynamic performance of the APS star sensor, and there is no systematic way to improve the dynamic performance of the APS star sensor and the best integration time under different angular velocities. analysis to improve the dynamic performance of the APS star sensor, so it is necessary to study a comprehensive and effective method to improve the dynamic performance of the APS star sensor

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