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Method for star sensor periodic fault detection based on gyro drift estimate value

A technology of fault detection and gyro drift, applied in the field of satellite attitude control

Active Publication Date: 2012-10-17
BEIJING INST OF CONTROL ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no means to detect periodic slow-changing faults of star sensors on the star

Method used

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  • Method for star sensor periodic fault detection based on gyro drift estimate value
  • Method for star sensor periodic fault detection based on gyro drift estimate value
  • Method for star sensor periodic fault detection based on gyro drift estimate value

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Embodiment Construction

[0022] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the present invention proposes a star sensor periodic fault detection method based on the gyro drift estimation value, relying on the gyro and star sensor installed on the satellite to realize, the steps are as follows:

[0024] (1) Process the output observations of gyroscopes and star sensors in an observation period (within time Time) through the Kalman filter algorithm, and obtain the time series of satellite attitude estimates and gyro drift estimates, and the time Time is at least 1 orbit cycle.

[0025] The formulas for obtaining satellite attitude estimates and gyro drift estimates using the Kalman filter algorithm are as follows;

[0026] x ^ k | k - 1 ...

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Abstract

The invention relates to a method for star sensor periodic fault detection based on a gyro drift estimate value, which is characterized by using a spectrum analysis of the gyro drift estimate value for detecting the slow periodic fault of the star sensor. A system is determined by the star sensor and the satellite attitude formed by gyro, and the gyro drift estimate value can be obtained according to the observed quantity of the star sensor. When the star sensor observed quantity comprises a periodic error signal possessing specific frequency, and the gyro drift estimate value obtained by Kalman filtering also comprises the periodic error with same frequency. Thereby, the slow periodic fault of the star sensor can be presented in the gyro drift estimate value, and the slow periodic fault of the star sensor can be detected according to the gyro drift estimate value. A Fourier response is an effective method for detecting the existence of the periodic signal, the gyro drift estimate value is subjected to Fourier response to obtain the frequency spectrum, the frequency spectrum on a specific spectrum segment can be monitored, and the whether the existence of the slow periodic fault of the star sensor can be determined.

Description

technical field [0001] The invention relates to a periodic fault detection method of a star sensor based on a gyro drift estimation value, and belongs to the field of satellite attitude control. Background technique [0002] With the rapid development of surveying and mapping satellites, the requirements for the satellite attitude determination system are getting higher and higher. The satellite attitude determination system not only serves the satellite control system, but also plays a vital role in the payload data processing. In order to ensure that the payload on the earth observation satellite obtains high-precision images, it is required that the satellite attitude determination system can accurately provide satellite attitude information. [0003] High-precision pointing satellites widely use satellite attitude determination systems composed of star sensors and gyroscopes. The system uses star sensors and gyroscopes as measurement components, uses the Kalman filter ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
Inventor 熊凯邢琰王南华王大轶刘成瑞宗红
Owner BEIJING INST OF CONTROL ENG