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Star tracking method of star sensor based on correlation of optical joint and transformation

A technology of joint transformation and star sensor, which is applied in the direction of space navigation vehicle guidance device, astronomical navigation, etc., can solve the problems of limited calculation speed, inability to make full use of information, misidentification of star points, etc. Effects that interfere with performance

Inactive Publication Date: 2010-05-05
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, this process is easily affected by background stray light, detector noise and carrier motion, which reduces the accuracy and anti-interference ability
Moreover, in order to take into account the calculation speed, only part of the star points are often taken, and the detected information cannot be fully utilized.
Secondly, none of the above methods can avoid the step of star map matching, that is, it is necessary to match and identify the captured star map with the local star library data, and this process is very time-consuming, which limits the further improvement of the calculation speed
In addition, there is also the problem of misidentification of star points

Method used

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  • Star tracking method of star sensor based on correlation of optical joint and transformation
  • Star tracking method of star sensor based on correlation of optical joint and transformation
  • Star tracking method of star sensor based on correlation of optical joint and transformation

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Embodiment Construction

[0058] Attached below Figure 4 Embodiments of the present invention will be described in detail. But it should not limit the protection scope of the present invention.

[0059] Such as Figure 4 As shown, the embodiment of the present invention includes three parts: a camera 1 , an embedded processor 2 , and an optical joint transform correlator 3 . The optical joint transform correlator includes a spatial light modulator 4 , a quarter wave plate 5 , a polarization beam splitter 6 , a Fourier lens 7 , a mirror 8 , a photodetector 9 , and a semiconductor laser light source 10 . Assume that the current star image captured by the camera is the K+1th frame star image, the star image captured at the previous moment is the Kth frame star image, and the attitude of the star sensor at the previous moment is known. The K+1 frame star map is horizontally spliced ​​with the K frame star map through the embedded processor 2, and then written into the spatial light modulator 4, after t...

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Abstract

The invention relates to a star tracking method of a star sensor based on correlation of optical joint and transformation, comprising the following steps of: carrying out correlative calculation on a front frame star atlas and a back frame star atlas of the star sensor shot by an optical joint transform correlator; and calculating deflection of the star atlas through changing a position of a correlative peak to obtain posture change information. The method avoids a step of extracting star points, and reduces influences on calculation precision by parasitic light, noise and carrier movement by using the information of the whole star atlas so as to greatly improve the star tracking accuracy and anti-interference performance. The correlative operation is realized by using the optical method, and the matching of a standard star database is not needed in the calculation process, therefore, the speed of star tracking is greatly improved.

Description

technical field [0001] The invention belongs to the space vehicle attitude measurement technology, in particular to a star tracking method for a star sensor. Background technique [0002] The star sensor determines the three-axis attitude of the spacecraft by detecting stars, and is one of the most important sensors for spacecraft attitude measurement. Star sensors usually have two working modes: attitude acquisition and star tracking. The former obtains the attitude of the aircraft by identifying the position of the currently captured star map in the all-sky star map; the latter obtains the current attitude of the aircraft by tracking the changes in the star map when the attitude of the previous moment is known. The star sensor is in tracking mode most of the time, and the star tracking method determines the tracking speed and tracking accuracy of the star sensor. With the development of spacecraft, higher requirements are put forward for the accuracy and speed of attitud...

Claims

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Application Information

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IPC IPC(8): G01C21/02B64G1/24
Inventor 贾辉杨建坤杨俊才李修建聂永明刘海波宿德志
Owner NAT UNIV OF DEFENSE TECH
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