Image processing method of star sensor based on fpga

Abstract

The invention discloses an FPGA-based star sensor image processing method, which includes the following steps: image high-pass filtering, star point centroid calculation, star point sorting, all work of star sensor image processing is realized based on FPGA, and the parallel computing system Structural realization. Compared with the prior art, the method adopted by the present invention has the advantages and beneficial effects of: making full use of the features of the star imaging of the star sensor and the digital image of the photoelectric detector, it can still run stably under the condition of strong light interference. Make full use of the advantages of FPGA in the design of parallel computing architecture, adopt four-stage pipeline to organize the computing modules in the image processing algorithm, and greatly improve the computing speed and the data update rate of the star sensor.

Description

technical field [0001] The invention relates to a star sensor image processing method, and realizes the algorithm with a parallel computing architecture based on FPGA. Background technique [0002] The star sensor is a key component of the spacecraft GNC system. It is a space precision instrument developed based on computer vision measurement theory. It is mainly used for spacecraft three-axis attitude measurement and spacecraft navigation. Star sensors are usually composed of three parts: optical and precision structural systems, photodetectors, signal processing circuits and software. Based on the computer vision measurement theory, with the stable light signal of the star as input, the star sensor can obtain the precise position of the star in its body coordinate system, and then the position information of the star based on the geocentric inertial coordinate system stored in its internal star catalog, The three-axis attitude information of the star sensor body relative ...

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Problems solved by technology

[0004] Tian Yulong et al. published the paper "Star Sensor Star Map Extraction Method Based on Local Entropy" in "Journal of Harbin Institute of Technology" (2005, 37: 1068-1070), and gave the method of extracting star point centroid of star sensor. An algorithm, implemented based on PC simulation, based on the serial mode of "save the star map to the memory first, and then extract the star points". The serial mode of work is difficult to improve the calculation efficiency

Yao Tailei and others published the paper "Research on Star Recognition Applicable to Star Sensors" in "Journal of Changchun University of Science and Technology" (2008, 31: 71-73), and gave a progressive scanning star point extraction based on RISC processor algorithm, but the calculation process of RISC processor is serial in nature, its operation speed is slo

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