Fixed star centroid extraction method used for area array instrument of geostationary orbit earth observation satellite

Abstract

The invention discloses a fixed star centroid extraction method used for an area array instrument of a geostationary orbit earth observation satellite. The fixed star centroid extraction method comprises the steps of: downloading and analyzing fixed star observation data of the area array instrument; preprocessing fixed star observation image sequences obtained through analysis; fusing the image sequences after removing fixed-pattern noise into a fixed star trajectory image by adopting an image sequence fusion method, and determining a fixed star trajectory region of the fixed star trajectoryimage; performing fixed star identification according to a number of fixed stars in a forecasting image surface and the determined fixed star trajectory region, and determining a fixed star region corresponding to each forecasted fixed star on each frame of image; acquiring a fixed star trajectory fitting equation by adopting a fixed star trajectory fitting method, and calculating a precise fixedstar centroid subpixel coordinate sequence; and selecting the most precise fixed star centroid subpixel coordinates from the precise fixed star centroid subpixel coordinate sequence. Compared with centroid coordinates obtained in a single frame image, the fixed star centroid subpixel coordinates determined by adopting the fixed star centroid extraction method is less affected by the noise, and thecalculation precision is higher.

Description

technical field [0001] The invention relates to a star barycenter extraction method for an area array instrument of a geostationary orbit earth observation satellite, and belongs to the technical field of satellite image processing. Background technique [0002] The geostationary earth observation satellite is located about 35,800 kilometers above the earth's equator. It operates synchronously with the earth's rotation and is relatively geostationary. It can observe a fixed area of ​​one third of the earth's surface and can continuously observe the same target area. An artificial earth satellite that observes the Earth and its atmosphere in outer space. [0003] The geostationary earth observation satellite adopts a three-axis stable platform, which can improve the accuracy of earth observation, observation frequency and flexibility of observation area, and realize a major technological leap. However, the three-axis stable attitude control method brings great challenges to ...

AI Technical Summary

Problems solved by technology

Therefore, high-precision stellar centroid extraction is the most important thing in the positioning of geostationary orbit satellites for earth observation, and its accuracy directly affects the accuracy of geostationary satellite positioning, thus affecting the quantitative application of product generation and data

[0004] like figure 1 As shown, the existing star centroid extraction methods are mainly based on single-frame images, because the single-frame images obtained after denoising processing also contain strong fixed pattern noise, which affects the development of star detection, recognition and positioning algorithms ; and it is also difficult to obtain high-precision star barycenter coordinates using the gray-scale center of gravity method based on a single frame image

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