A star sensor image processing method and system

Abstract

The invention discloses a star sensor image processing method. The method includes the steps that star point extraction threshold values of all channels are calculated; according to the star point extraction threshold values of all the channels, regions which suffer stray light disturbance are removed, pixels, of which the gray values are higher than the star point extraction threshold values, in the channels are synchronously screened out line by line according to the channels and do not suffer stray light disturbance, the screened-out pixels are stored, and the screening result is recorded; according to the screening result, the screened-out pixels are recognized one by one, mass center feature parameters of possible star points are calculated, recognizing results are recorded, and row coordinates and gray value information of the pixel on the rightmost side of the possible star point in each line are stored; according to the line coordinate and gray value information of the pixels on the rightmost sides of the possible star points and the recognizing results, the star points and noise points are judged, and the noise points are removed. The invention further discloses a star sensor image processing system. The star sensor image processing method and system are good in function of resisting stray light. Under the condition that the area array of a detector is substantially increased, a high data updating rate still can be kept.

Description

technical field [0001] The invention relates to a star sensor image processing method and system, in particular to a star sensor image processing method and system based on a large area array multi-channel output detector, which is realized by using FPGA parallel computing structure system. Background technique [0002] The star sensor is one of the key measurement mechanisms of the spacecraft attitude and orbit control system. It is used to measure the component of the star vector in the star sensor coordinate system. It is identified through the star map and uses the precise position of the known star to determine the satellite relative position. The three-axis attitude in the inertial coordinate system. Star sensors are usually composed of sophisticated optical and structural systems, photoelectric detection and signal processing circuits, and software. [0003] Digital image processing is one of the key technologies of star sensors. Its stability, computing speed and ac...

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Problems solved by technology

[0004] Li Deliang and others published the paper "A Star Point Extraction Method Applicable to Star Sensors" in "Laser and Infrared" (2009, 39: 1348-1350), and proposed that the star target and the The method of background separation, when the star sensor is disturbed by stray light, this method cannot effectively remove the area disturbed by stray light; Tian Yulong et al. in "Journal of Harbin Institute of Technology" (2005, 37:1068-1070) In the paper "Star Sensor Star Map Extraction Method Based on Local Entropy", an algorithm for star point centroid extraction of star sensor based on PC simulation is given. It is difficult to improve the calculation efficiency; Mao Xiaonan and others published a paper "Star Sensor Image Processing Algorithm Based on Parallel Computing Architecture" in "Acta Astronautics" (2011, 32: 613-619), An algorithm that uses FPGA to extract the star point centroid of the star sensor in parallel, but this algorithm is only suitable for single-channel output detectors, and it is difficult to apply to multi-channel output detectors based on large area arrays

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