A star point segmentation method under moonlight interference and its fpga implementation device

Abstract

The invention discloses a star point segmentation method under interference of moonlight and an FPGA device of the star point segmentation method. The method comprises that the local gradient G of a star point window image under the interference of moonlight is calculated; influence of moonlight noise is eliminated via a gradient threshold; and a self-adaptive threshold is used to determine whether the central pixel gray value of a window is higher than the self-adaptive threshold, and if it is determined that a star point or part of the star point in contained in the window and the central pixel gray value of the window is higher than the self-adaptive threshold, the central pixel of the window is determined to be the star point finally. The FPGA device of the method comprises a gray degree window generation module, a local gradient module, a self-adaptive threshold module and a segmentation result processing module. All of star point segmentation is realized by the FPGA device, the power consumption is low, the device is small, system design is concise, the advantages of parallel assembly line calculation are fully played, and the requirement of instantaneity is satisfied.

Description

technical field [0001] The invention relates to a star point segmentation method under moonlight interference and an FPGA realization device thereof, belonging to the technical field of star sensors. Background technique [0002] The star sensor is a space precision instrument that obtains the three-axis attitude information of the spacecraft based on the matching of the star point information in the current field of view and the star map. It is mainly used in the astronomical navigation of the spacecraft. The working process of the star sensor mainly includes three processes: star point extraction, star map recognition and attitude calculation. Star point segmentation is the first step in star point extraction, and it is also a basic and critical step in the design of star sensors. Its segmentation accuracy will seriously affect the efficiency and accuracy of subsequent steps, thereby affecting the reliability of star sensors. Measurement accuracy and data update rate, etc...

AI Technical Summary

Problems solved by technology

[0005] The technical solution problem of the present invention: overcome prior art deficiency, provide a kind of star point segmentation method and its FPGA realization device under the interference of moonlight to mainly solve following several problems: (1) for the segmentation of star point under the interference of moon, current research less, and the traditional threshold segmentation method cannot be applied to the accurate segmentation of star points under the interference of the moon

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