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Small-view-field star sensor star map recognition method and device based on attitude information assistance

A star sensor, star map recognition technology, applied in astronomical navigation, navigation through speed/acceleration measurement, etc., can solve the problems of poor noise robustness, too simplified the number of triangles, long time, etc., to reduce false matching or Multi-match, strong robustness and practicality, the effect of shortening the running time

Pending Publication Date: 2022-07-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

This method can quickly complete star map identification and reduce redundancy, but the number of triangles is too simplistic, which makes the conditions for constructing observation triangles harsh, and the star map identification results are easily affected by magnitude noise
The triangle algorithm has many redundant matches, a large amount of calculation time, and poor robustness to noise, which are difficult to solve at the same time. In addition, under the observation condition of small field of view, the number of triangles in the star map is small and the construction conditions are harsh. The difficulty of star map identification further increases

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  • Small-view-field star sensor star map recognition method and device based on attitude information assistance
  • Small-view-field star sensor star map recognition method and device based on attitude information assistance
  • Small-view-field star sensor star map recognition method and device based on attitude information assistance

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[0133] The attitude information-assisted star map recognition algorithm uses the prior attitude information of the star sensor to obtain candidate stars, thereby providing additional reference information for the star map matching process and improving the speed of star map recognition. The attitude information can be given by the attitude output by the star sensor itself at the last moment, and can be directly given by the inertial navigation system when it is assisted by the inertial navigation system. Since the prior pose information generally has errors, it will have an impact on the success rate of recognition. In this section, through simulation under different attitude error conditions, the attitude error gradually increases from 0.02° to 1°, and the recognition success rate of the algorithm is examined. The recognition results are as follows Figure 4 . according to Figure 4 It is found that under the condition of small attitude error, the success rate of star map r...

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Abstract

The invention discloses a small-field-of-view star sensor star map identification method and device based on attitude information assistance, the attitude information provided by a navigation system is used for calculating the attitude of a star sensor at the current moment, fixed stars in a celestial sphere area near to which an optical axis points are selected as candidate stars, and the star map of the star sensor is identified by using the obtained candidate star prior information. And a star map recognition matching process is carried out in combination with a triangle algorithm, so that the matching redundancy is improved, and the aim of reducing mismatching and multi-matching probabilities is fulfilled.

Description

technical field [0001] The invention relates to the fields of spacecraft navigation, guidance and control, in particular to a method and a device for identifying a star map of a small field of view star sensor based on attitude information assistance. Background technique [0002] Attitude measurement is the premise of spacecraft flight control, and it is of great significance to ensure the spacecraft's high-performance flight, high-precision observation and the smooth completion of various space missions. The star sensor performs attitude calculation by observing stars. It has the advantages of high reliability, high precision, strong autonomy and no error accumulation. It is currently widely used in the attitude measurement of spacecraft. Its working principle is: the star sensor obtains the star map within the current field of view through its optical imaging system, extracts the coordinates of the star in the star map (or adds brightness information), and completes the o...

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Application Information

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IPC IPC(8): G01C21/02G01C21/16
CPCG01C21/025G01C21/16
Inventor 倪源蔓戴东凯王省书谭文锋秦石乔
Owner NAT UNIV OF DEFENSE TECH
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