A high-precision star sensor field accuracy test method

Abstract

The invention discloses an outfield precision testing method for a high-precision star sensor. Accuracy in calculation of a star pattern posture of the star sensor and frequency domain stripping of short-period error terms of the posture are realized by utilizing a procession correction formula, an earth rotation model, an atmosphere correction model and a power spectral density formula, and the posture measuring error of the star sensor can be rapidly and effectively analyzed and evaluated. According to the method, the hardware resource is not occupied, the method is realized by utilizing software and does not need the ground intervention. According to the method, by combining the posture identification principle of the star sensor and adopting a data smoothing method, the posture truth value of each frame star pattern moment is calculated, so that a foundation is established for the subsequent analysis on the posture measuring error; by adopting the method for combining the time domain and the frequency domain, the short-period error term is decomposed into an airspace low-frequency error, a high-frequency error and a time-domain error by virtue of the power spectral density analysis, so that reasonable data support is provided for further evaluation of the precision indexes of the star sensor, and the index performance of the star sensor can be improved.

Description

technical field [0001] The invention relates to a method for testing the field accuracy of a high-precision star sensor, in particular to a method for testing the field accuracy of a high-precision star sensor based on an earth rotation model and power spectrum analysis, and belongs to the technical field of testing. Background technique [0002] The star sensor is an important attitude-fixing device for satellites. The accuracy index of the star sensor reflects an important index of product performance, and its accuracy verification is an important link in the product development process. According to the ESA standard, the error of the star sensor can be divided into three items according to the error change cycle: long-term error, low-frequency error and high-frequency error. [0003] At present, the ground accuracy test of the star sensor includes two methods: indoor test and field test. The field test is the most "real" test method for star sensor accuracy. There are two...

AI Technical Summary

Problems solved by technology

Since the constant value deviation is the error caused by the long-term operation of the star sensor in orbit due to factors such as its internal deformation and installation position change, it cannot be tested on the ground

However, at present, both the self-measurement method and the external measurement method can only obtain all the attitude measurement errors of the star sensor except for the constant deviation, that is, the sum of the low-frequency error and the high-frequency error term, and it is impossible to separate the total error to obtain the star sensor’s Measured values ​​of low-frequency error and high-frequency error

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