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 large computing overhead, unnecessary, time-consuming, etc., and achieve the effects of shortening matching time, reducing matching times, and computing time-consuming.

Inactive Publication Date: 2007-12-26
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
As shown in Figure 1, for No. 5 star 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 Pointless, 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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  • Fast tracting method of star sensor

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Embodiment

[0049] The speed of the existing tracking algorithm has been greatly improved by adopting the above three improvements. 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 partitioned star catalog used in the simulation program is a partitioned star catalog that divides the sky into 486 blocks. Set the threshold δ of the map to 13. The following is the result of the software simulation test.

[0051] (2) Set the star sensor's initial attitude (pitch angle 70°, yaw angle 20°, roll angle 0°) and final attitude (pitch angle 80°, yaw angle 30°, roll angle 0°). In the process of simulating the tracking of the star sensor from the initial attitude movement to the final state, there are 139 steps to track. Each step will generate a star map according to the attitude of each step to simulate the star map collected by the star sensor, and then use the reference star map of the previous frame t...

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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 celestial navigation and relates to the improvement of a star tracker tracking method. Background technique [0002] The emergence of star sensor technology has opened up a new way for 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 all-sky star pattern 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, the tracking window method and the matching recognition method. Among them, the tracking method of matching recognition method is adopted because it is simple, effective and fast. Matching recognition methods are further divided into ...

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Application Information

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Patent Type & Authority Patents(China)
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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