Geostationary Satellite Imaging Navigation and Registration Star North-South Parameter Extraction Method and System

Abstract

The invention provides a geostationary satellite imaging navigation and registration fixed star north and south parameter extraction method, and a system. The geostationary satellite imaging navigation and registration fixed star north and south parameter extraction method comprises following steps: 1, the relationship of the grey level of column image elements with fixed star image north and south direction coordinate components is established; 2, detector image element grey level when a fixed star passes through the column image element center is extracted; 3, the fixed star north and south direction coordinate components are calculated; 4, the north and south direction coordinate components when the center of a fixed star image passes through the center line of the east and west direction of the detector are calculated. According to the geostationary satellite imaging navigation and registration fixed star north and south parameter extraction method, in calculating of fixed star image coordinates, fixed star image shape and brightness distribution characters are taken into consideration fully, identification precision is increased greatly; and multiple column image elements calculation results are subjected to least square fit so as to reduce star position high-frequency error caused by factors such as detector optical imaging, circuit noise, and satellite high frequency jitter.

Description

technical field [0001] The invention relates to digital signal and image processing technology, in particular to a method and system for extracting north-south parameters of stationary satellite imaging navigation and registration stars. Background technique [0002] With the improvement of the application technology of remote sensing satellites, it is usually required that the images of the ground imaged by high-precision geostationary satellites be precisely positioned and registered to the nominal grid of the earth. However, satellite platforms and remote sensing instruments are affected by factors such as space mechanical environment and thermal environment changes. Satellites will have orbital drift and attitude pointing deviations, and instruments will produce geometric deformation, which will affect the positioning and registration accuracy of remote sensing images. Satellite imaging navigation and registration technology can solve such problems: the satellite perform...

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Problems solved by technology

[0008] Li Xiaokun, Wang Ganquan, and Chen Guilin introduced the Fengyun-4 satellite scanning in the article "FY-4 Meteorological Satellite Scanning Imager - Visible Light Channel Stellar Sensitivity" in Science Technology and Engineering Volume 7, Issue 6 (March 2007). The imager uses the star-sensitive method to solve the internal deformation of the instrument, and proposes to obtain the position of the star passing through the detector through weighted analysis, but it does not fuse the data of multiple detectors

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