A porthole type star sensitive system testing method

Abstract

The invention discloses a method for testing a porthole-type star sensor system. The method comprises (1) carrying out a porthole-type star sensor static precision test through a single star simulator, (2) comparing the influence caused by a porthole on star sensor detection sensitivity through star sensor picture photographing under the actual sky background, (3) aligning a star sensor having a porthole to a sky area, carrying out continuous working for some time and carrying out statistics on static measuring accuracy, (4) putting the star sensor on a rotary table, carrying out rotation at a certain angle rate and measuring influence caused by the porthole on dynamic tracking performances of the star sensor, and (5) testing the influence caused by the porthole on a stray light protection angle through a solar simulator. The invention provides the method for testing a porthole-type star sensor system for the first time. The method can test the influence caused by the porthole on star sensor functions and performance indexes, can verify whether the design satisfies system task demands, is conducive to specific design improvement of the porthole-type star sensor and provides guidance for on-orbit use strategy of a porthole-type star sensor.

Description

technical field [0001] The invention relates to the technical field of satellite stand-alone testing, in particular to a testing method for a porthole-type star sensor system. Background technique [0002] Ordinary star sensor attitude measurement often adopts the method of directly shooting star maps for attitude determination; due to mission application requirements, the star sensor is installed inside the aircraft, and the attitude is determined through the porthole. In order to ensure that the star sensor can take star maps normally, the portholes are made of glass with high light transmittance. Because glass has optical properties such as reflection, refraction, and scattering, it may have certain effects on the function and performance of the star sensor. When the star sensor determines the attitude, it needs to extract the star point information from the shooting star map. The starlight falls on the star sensitive detector after being refracted by the porthole glass,...

AI Technical Summary

Problems solved by technology

Because glass has optical properties such as reflection, refraction, and scattering, it may have some impact on the function and performance of the star sensor

When the star sensor determines the attitude, it needs to extract the star point information from the shooting star map. The starlight falls on the star sensitive detector after being refracted by the porthole glass, which may affect the star point energy and the angular distance between the stars reaching the detector, and then affect the starlight. Attitude measurement accuracy of the sensor

When there is external light (such as sunlight, moonlight), the glass may change the optical path and generate new stray light, which increases the background gray threshold of the captured star map, which is not conducive to the star sensor to extract star point information for attitude determination

The existing star sensor testing technology only tests the star sensor, without considering the influence of portholes on the attitude determination ability of the star sensor; and this method is the first application in China, and there is no corresponding use experience for reference

If the porthole-type star sensor is not systematically tested to find out the possible impact of the porthole on the detection sensitivity, measurement accuracy and stray light of the star sensor, it will be impossible to verify whether the porthole-type star sensor meets the mission requirements, and the use strategy requires Matters needing attention

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