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Fuzzy star map restoration method adopting regional filtering

An area filtering and blurring technology, applied in the field of celestial navigation, can solve the problems of motion blur of star points, difficulty in extracting blurred areas of star points, and reduction of image signal-to-noise ratio, so as to improve image signal-to-noise ratio, improve positioning accuracy, and strong The effect of robustness

Active Publication Date: 2018-12-18
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The present invention solves the phenomenon that when the star sensor works under dynamic conditions, the star point will appear motion blur due to energy dispersion during the imaging process, resulting in a decrease in the signal-to-noise ratio of the image and the blurred area of ​​the star point is difficult to be extracted , resulting in a decrease in the positioning accuracy of the star point centroid, which seriously affects the attitude measurement accuracy of the star sensor. A fuzzy star image restoration method using area filtering is provided, which can effectively improve the image signal-to-noise ratio and improve the star point centroid accuracy. positioning accuracy

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  • Fuzzy star map restoration method adopting regional filtering

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specific Embodiment approach 1

[0022] Specific implementation mode 1. Combination Figure 1 to Figure 4 Describe this embodiment mode, a kind of fuzzy star map restoration method that adopts area filtering, this method is realized by the following steps:

[0023] Step 1. Based on the motion model of the center of mass of the star point, the degradation function of the fuzzy star map is established: 1. The degradation function h of rotation around the z axis z (x,y); 2. Rotate h around the x-axis and y-axis at the same time xy (x,y). Suppose at t 0 At this time, the coordinates of the center of mass of the star point on the sensor target surface are (x(t 0 ), y(t 0 )), the corresponding observation vector is w s (t 0 ), at t 0 At +Δt moment (Δt0 +Δt), y(t 0 +Δt)), the corresponding observation vector is w s (t 0 +Δt), assuming that the three-axis angular velocity of the star sensor hardly changes in a very short time interval Δt, since the time interval Δt is much smaller than the focal length f of...

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Abstract

The invention discloses a fuzzy star map restoration method adopting regional filtering, relates to the technical field of celestial navigation, and solves the problems that the positioning precisionof the mass center of a star point is reduced and the attitude measurement precision of a star sensor is seriously influenced because the signal-to-noise ratio of an image is reduced and a fuzzy region of the star point is difficult to extract due to a motion fuzzy phenomenon of the start point due to energy dispersion in an imaging process when the star sensor works in a dynamic condition. The method comprises the steps of building motion models of the mass center of the star point under different working conditions; determining a motion track of the mass center of the star point; extractingthe fuzzy region of the star point; preprocessing images inside and outside the fuzzy region by utilizing a regional filtering algorithm; and finally, restoring a fuzzy star map by utilizing an imagerestoration algorithm and a degradation function. The method can adapt to the high-dynamic (2 degrees / s) condition, and can improve the positioning precision of the mass center of the star point whileeffectively improving the signal-to-noise ratio of the image.

Description

technical field [0001] The invention relates to the technical field of celestial navigation, in particular to a fuzzy star map restoration method using area filtering. Background technique [0002] The star sensor is a high-precision, high-reliability attitude-sensitive measuring instrument that uses stars as the measurement object. It has been widely used in space missions such as deep space exploration and astronomical navigation. Its working principle is: the image sensor images the starry sky, obtains the position and brightness information of the star point on the sensor target surface through star point extraction and centroid positioning, and then uses the star map to identify the star point to find its corresponding matching navigation in the star catalog Finally, according to the recognition results, the three-axis attitude of the star sensor relative to the inertial coordinate system is calculated. Star sensors usually work under static conditions and are mostly u...

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Application Information

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IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 穆治亚何昕魏仲慧王军张磊何家维何丁龙吕游
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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