A Star Point Extraction and Compensation Method under the End-of-Life Condition of Star Sensor

A compensation method and star point extraction technology, applied in astronomical navigation and other directions, can solve problems such as dividing star points and image spots, and achieve the effects of reducing impact, improving positioning accuracy, and high positioning accuracy

Active Publication Date: 2021-12-10
SHANGHAI AEROSPACE CONTROL TECH INST
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Problems solved by technology

[0006] Under the condition of low signal-to-noise ratio, because S(x, y) is too small and η(x, y) is too large, the threshold segmentation method cannot select a suitable threshold T to segment star spots, even if it can segment higher energy Individual pixels of , will also be judged as high-energy noise by the connected domain method due to too few pixels

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  • A Star Point Extraction and Compensation Method under the End-of-Life Condition of Star Sensor

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Embodiment Construction

[0035] In order to enable the star sensor to achieve stable extraction of star points under the condition of low signal-to-noise ratio at the end of its life, the present invention proposes a star point registration and compensation method based on a star imaging model.

[0036] The star imaging model is a model that describes the energy distribution of star spots and spots, and can accurately fit the energy distribution of star points, which provides a new criterion for star point extraction, that is, using the gray distribution characteristics and image registration method Extract star points.

[0037] G(x,y)=S(x,y)+B(x,y)+η(x,y) (1)

[0038] According to formula (1), the background gray level B(x, y) is generally a constant value, and the noise η(x, y) is randomly distributed, so the star point gray level S(x, y) can affect the gray level of the pixel where it is located The value G(x,y) makes it present a distribution characteristic similar to S(x,y).

[0039] Such as f...

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Abstract

The invention relates to a method for extracting and compensating star points under the end-of-life condition of a star sensor, comprising the following steps: establishing a star point image spot template; calculating the correlation response between the template and the window image point by point in the star point window, and finding the maximum response area As the area where the star point is located; adjust the gray value of the template; use the adjusted template to compensate the star point image spot; calculate the coordinates of the center of mass of the star point in the window. The method of the invention can run stably during the whole life of the star sensor, can stably extract star points under the condition that the signal-to-noise ratio of the star sensor is low, and ensures that the accuracy meets the requirements.

Description

technical field [0001] The invention relates to a star point extraction and compensation method under the end-of-life condition of a star sensor. Background technique [0002] At present, the key model missions represented by atmospheric environment detection and Fengyun-4 satellite put forward higher requirements for the detection accuracy of star sensors. . For LEO orbits, a life of more than 8 years is usually required, and for GEO orbits, a life of more than 10 years is usually required. The main difficulty is that, compared with the initial stage of orbiting, after long-term operation in orbit, due to factors such as device aging and space radiation, the noise increases and the signal-to-noise ratio of the image decreases significantly, which affects the star point extraction rate and star point centroid positioning accuracy. If there is no relevant algorithm, it is difficult to ensure the efficiency and accuracy of attitude measurement only with high-level detectors ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02
CPCG01C21/02
Inventor 练达周琦毛晓楠余路伟郑循江张磊徐亚娟
Owner SHANGHAI AEROSPACE CONTROL TECH INST
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