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An iterative traversal-based star sensor anti-stray light star point extraction method and device

A technology of star point extraction and star sensor, which is applied in the field of satellite attitude control, can solve the problem of not being able to quickly output effective attitude, and achieve the effect of improving the anti-stray light ability on orbit, reducing false star interference, and improving the recognition probability

Active Publication Date: 2022-07-05
BEIJING INST OF CONTROL ENG
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Problems solved by technology

[0010] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, and to propose a method and device for extracting star points against stray light based on iterative traversal, which effectively solves the problem that the product cannot quickly output an effective attitude when it is disturbed by stray light in orbit. problem, significantly improved the ability of the star sensor to resist stray light in orbit

Method used

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  • An iterative traversal-based star sensor anti-stray light star point extraction method and device
  • An iterative traversal-based star sensor anti-stray light star point extraction method and device
  • An iterative traversal-based star sensor anti-stray light star point extraction method and device

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Embodiment

[0078] like figure 2 shown:

[0079] 1) Set the number of image processing frames N frame The initial value is 0, the image time t i The initial value of the subscript number i is 0, and the number of stars is selected. star The initial value is 0, and the number of windows N is randomly generated. window is 10, and the window size is 36×36;

[0080] 2) At time t0, 10 valid window center coordinates UV_rand are randomly generated, corresponding to the valid window center coordinates UV_center=UV_rand at time t0;

[0081] 3) Windowing the image at time t0 according to the 10 window center coordinates UV_center and the window size of 36×36;

[0082] 4) Calculate the background mean and threshold of 10 window images respectively, take the i-th window as an example, i=1, 2, 3,..., 10, and calculate the corresponding window according to the pixel grayscale of the i-th window edge 6 rows × 6 columns The image grayscale mean Mean windowi and image standard deviation Std wind...

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Abstract

An iterative traversal-based star sensor anti-stray light star point extraction method and device, the method randomly generates N windows in the whole image, calculates the mean value and threshold of each window, and uses the calculated window threshold in the window to pass the traversal Extraction of star points in the connected domain method; calculate the position coordinates of star points by the first-order centroid method, and store the energy information of each star point; sort the extracted valid star points by energy, retain the coordinates of the brightest n star points, and at the same time Randomly generate N-n window coordinates; use the above-mentioned reserved n star point coordinates and the randomly generated window coordinates for windowing of the next frame of star map; iteratively execute the above steps, and the star map can be extracted after multiple traversals middle N star the brightest star point, using the N star The star points are used for subsequent all-sky star map recognition and attitude calculation. The invention effectively solves the problem that the product cannot output an effective attitude quickly due to the interference of stray light in orbit, and significantly improves the anti-stray light capability of the star sensor in orbit.

Description

technical field [0001] The invention belongs to the technical field of satellite attitude control, and relates to an iterative traversal-based star sensor anti-stray light star point extraction method and device. Background technique [0002] The star sensor obtains the star observation vector by imaging the space stars, uses the star map matching method to determine the direction of the star sensor's optical axis in the inertial space, and uses the conversion relationship between the star sensor body coordinate system and the satellite attitude coordinate system to determine the satellite. attitude. [0003] The star point extraction algorithm is the basis for the star sensor to achieve high-precision attitude measurement accuracy, and it is also one of the longer time-consuming parts of the current star sensor software processing process. The star point positioning accuracy directly affects the success probability of star map recognition and the effectiveness of attitude c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/24
CPCG01C21/24
Inventor 程会艳郑然武延鹏张腾飞隋杰李玉明王苗苗张洪健关健夏梦绮
Owner BEIJING INST OF CONTROL ENG
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