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Fast tracting method of star sensor

A star sensor and star tracking technology, applied in the field of astronomical navigation, can solve the problems of high computational overhead, meaningless, and unnecessary in real-time implementation, and achieve the effects of shortening matching time, computing time, and matching times.

Inactive Publication Date: 2007-01-17
BEIHANG UNIV
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Problems solved by technology

When searching, if the coordinate information of each star in the star catalog has to be calculated and compared to determine whether it satisfies the conditions for mapping to the field of view, then this process is very time-consuming
[0005] (3) In the process of matching and identification, the comparison between some distant stars is unnecessary
like figure 1 As shown, for star No. 5 in the current frame star map, the distances between stars 4', 5', 6', and 8' in the current reference star map are relatively large, and the comparison between them is meaningless , is unnecessary time-consuming work
[0006] (4) The calculation of the distance is based on the square sum square root operation, and the calculation overhead is relatively large compared to the hardware real-time implementation

Method used

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Embodiment

[0049] The adoption of the above three improvements greatly improves the speed of the existing tracking algorithm. In this regard, a simulation test was carried out on a Celeron 900(m) machine. The specific method of testing is as follows:

[0050] (1) The partition star table used in the simulation program is a partition star table that divides the sky into 486 blocks. The threshold δ for mapping is set to 13. Below are the results of the software simulation test.

[0051] (2) Set the initial attitude (pitch angle 70°, yaw angle 20°, roll angle 0°) and final attitude (pitch angle 80°, yaw angle 30°, roll angle 0°) of the star sensor. In the tracking process of the simulated star sensor from the initial attitude movement to the final state, there are 139 steps to track. Each step will generate a star map to simulate the star map collected by the star sensor according to the attitude of each step, and then use the reference star map of the previous frame to track and identi...

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Abstract

The invention relates to the modification to the tracking method of the star tracker. The process includes: it gets the reference star map of the K+1 frame by the star mapping; the every star in the star map collected by the (K+1) frame is matched to the star in the reference star map of the K+1 frame; the character is to map the star by the threshold value mapping; while it searches the star by the zone catalogue; in the matching process, it arrays the sequence firstly then to match. The computing of the invention cost the short time, so it has the high speed.

Description

technical field [0001] The invention belongs to the technical field of astronomical navigation, and relates to the improvement of a tracking method for a star tracker. Background technique [0002] The emergence of star sensor technology has opened up a new way for the attitude measurement of spacecraft. The star sensor has two working modes: initial attitude acquisition and tracking mode. When the star sensor is working, it enters the tracking mode after the initial attitude is obtained through the all-sky star map recognition. Most of the working time of the star sensor is in the tracking mode, and the fast star tracking method can improve the overall performance of the star sensor. The current star tracking methods mainly include two tracking methods: tracking window method and matching recognition method. Among them, the tracking method of matching identification method is adopted because it is simple, effective and fast. The matching identification method is further...

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Application Information

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IPC IPC(8): G01B11/03G01B21/04B64G3/00G01C21/02
Inventor 江洁张广军李霄魏新国
Owner BEIHANG UNIV
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