Star point reconstruction-based star sensor dynamic-compensation method
A star sensor, dynamic compensation technology, applied in the direction of instruments, measuring devices, astronomical navigation, etc., can solve problems such as unfavorable star point recognition and attitude calculation, and achieve the effect of improving the signal-to-noise ratio.
Active Publication Date: 2015-07-08
BEIJING INST OF CONTROL ENG
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This algorithm needs to obtain the extremely accurate angular velocity of the star point moving on the image surface. At the same time, because the star point itself is not large, the covered pixels will not exceed 20. The binning method will cause the star point to be too small, which is not conducive to the star point. Point recognition and attitude calculation
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[0016] The invention proposes a star sensor dynamic compensation method based on star point reconstruction. The principle of the method is as follows:
[0017] (1) Assume that during the processing, a total of np frames of star maps are saved, and the image plane coordinates of the extracted star points in these star maps are recorded (if not extracted, the coordinates of the predicted star points are recorded), and the navigation asterisks corresponding to the star points .
[0018] (2) Calculate the angular velocity ω of the current frame of the star sensor according to the attitude filter t , assuming that the attitude filter coefficients are a i and b i , the input and output of the n-order digital filter are ω after,i with ω before,i , where i=1,2,…n, then
[0019] ω after x , ...
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The invention discloses a star point reconstruction-based star sensor dynamic-compensation method. The star point reconstruction-based star sensor dynamic-compensation method comprises the following steps of 1, opening windows of N*N based on all predicted navigation star points in a star map in a current frame as centers, wherein if no star point is extracted from the i-th window, the navigation star point corresponding to the i-th window is a navigation star point Si, 2, searching a window sequence corresponding to the navigation star point Si from the stored frame sequences, 3, dividing all pixels in the window into n*n small grids, 4, aligning the navigation star point Si in positions corresponding to centroids in the windows, and carrying out corresponding superposition, and 5, carrying out star point extraction in the superimposed windows. The star point reconstruction-based star sensor dynamic-compensation method can rebuild an elongated star point track into uniform star points, realize change of a line into points, and realize a high signal-to-noise ratio. The star point reconstruction-based star sensor dynamic-compensation method realizes continuous tracking of a star sensor at a rate of 1 degree per second, is conducive to improvement of a dynamic tracking capacity of a star sensor and has international competitiveness.
Description
technical field [0001] The invention belongs to the technical field of star extraction and identification, and is suitable for the research on the dynamic performance of a star sensor. Background technique [0002] The star sensor is an optical attitude measurement sensor with a star as the measurement target, which can output high-precision attitude information. The star sensor has the function of autonomous acquisition, which can provide support for the autonomous operation of the satellite in space, and is the key optical attitude measurement component to realize the upper level of the satellite control subsystem. Dynamic performance is one of the key indicators to measure the performance of star sensors. Under high dynamic working conditions, the star sensor will be affected by the exposure time, which will cause the imaged star point to show a "smearing" phenomenon, that is, the luminous flux of the star point will be scattered on more pixels, resulting in blurred star...
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IPC IPC(8): G01C25/00G01C21/02
Inventor 鹿瑞郑然杜建伟李玉明王艳宝武延鹏王晓燕
Owner BEIJING INST OF CONTROL ENG