Fast-moving star tracking matching identification method of star sensor

A technology of star sensor and recognition method, which is applied in the field of satellite autonomous navigation, can solve the problems of small number of stars, false matching, and poor stability of tracking methods, etc., and achieve the effect of improving stability and eliminating false matching

Active Publication Date: 2014-07-02
深圳市思聪教育科技有限公司
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Problems solved by technology

[0004] The present invention aims to solve the problem that the number of tracked and matched stars obtained by the existing star sensor tracking star recognition method is small, the tracking method has poor stability, and the method has the problems of mis-matching caused by stars that have just entered the field of view, and provides a star tracking method. Fast Star Tracking and Matching Recognition Method for Sensors

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  • Fast-moving star tracking matching identification method of star sensor

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specific Embodiment approach 1

[0027] Specific implementation mode 1. Combination Figure 1 to Figure 9 Description of this embodiment, a fast star tracking and matching recognition method for a star sensor. First, by determining the edge area of ​​the field of view, an effective reference star is selected to participate in the matching recognition, which can avoid mis-matching caused by new stars entering the field of view, thereby improving The effectiveness of the star tracking algorithm; then use the two-way recursive idea to carry out matching recognition, which greatly increases the number of stars tracked and matched in each step; the specific steps are:

[0028] 1. Determination of the edge area of ​​the field of view:

[0029] During the actual working process of the star sensor, due to the movement of the platform attitude, the stars appearing in the edge area of ​​the field of view of the star sensor will be unstable, that is, these stars may just enter the field of view, or may be in the next fr...

specific Embodiment approach 2

[0049] Specific embodiment two, combine Figure 10 and Figure 11 Describe this implementation mode, this implementation mode is the embodiment of the fast star tracking matching identification method of the star sensor described in the specific implementation mode one:

[0050] In this embodiment, the star sensor integration time is set to 0.1s, the neighborhood radius r is 50, and the image plane size is 2048×2048 pixels. According to equations (1) and (2), the edge area of ​​the field of view is determined to be 26 from the field of view. area within pixels. Perform fast star tracking when the angular velocity of the attitude movement is 0.2° / s and 10° / s respectively, the performance comparison of the two fast star tracking algorithms is as follows Figure 10 , 11 shown.

[0051] In the case of a large neighborhood radius, by Figure 10 , 11 It can be seen that when the angular velocity of the attitude movement is small, using the fast star tracking method described i...

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Abstract

The invention relates to a fast-moving star tracking matching identification method of a star sensor and relates to the field of satellite autonomous navigation technologies. By utilizing the fast-moving star tracking matching identification method, the problems of small number of tracking matching fixed stars obtained by the existing identification method of tracking star of the star sensor and poor stability of a tracking method are solved. The existing method has the problem of mismatching caused by the fixed star just entering the field of view. For ensuring matching effectiveness simultaneously, the number of the tracked matching fixed stars is further increased so as to improve the stability of a star tracking algorithm. In the matching process, in order to make a smaller amount of calculation, matching number state identification and borderline state identification arrays are subjected to operation with bitwise, and if a result is 1, matching is considered to be successful. By adopting the identification method with first sorting and second two-way recursive matching, pointless comparison is reduced, mismatching caused by the star newly entering the field of view is eliminated, most important of all, the number of the tracked matching fixed starts of every step is greatly improved, and the stability of the tracking algorithm is further improved.

Description

technical field [0001] The invention relates to the technical field of satellite autonomous navigation, in particular to a fast star tracking and matching identification method for a star sensor. Background technique [0002] The star sensor generally includes two working modes: the initial attitude acquisition mode and the tracking mode. In the initial attitude acquisition mode, the star sensor establishes the initial attitude through the full-sky star map recognition. Once the initial attitude is successfully established, the star sensor will switch to the tracking mode, and the attitude information obtained from the previous frame or several frames of images can be used to predict and identify the position of the star in the current frame image. Under normal working conditions, the star sensor is in the tracking mode most of the time, that is, the tracking mode is the main working mode of the star sensor, and its tracking speed and stability are the main performance indi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 李欣璐杨进华张刘金光
Owner 深圳市思聪教育科技有限公司
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