Design and DSP implementation of star image acquisition and star point fast acquiring and tracking

Guohui Zhou; Xiaodong Wang; Zhihang Hao

doi:10.1117/12.676415

19 May 2006 Design and DSP implementation of star image acquisition and star point fast acquiring and tracking

Guohui Zhou, Xiaodong Wang, Zhihang Hao

Proceedings Volume 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 61500Y (2006) https://doi.org/10.1117/12.676415
Event: 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2005, Xian, China

Abstract

Star sensor is a special high accuracy photoelectric sensor. Attitude acquisition time is an important function index of star sensor. In this paper, the design target is to acquire 10 samples per second dynamic performance. On the basis of analyzing CCD signals timing and star image processing, a new design and a special parallel architecture for improving star image processing are presented in this paper. In the design, the operation moving the data in expanded windows including the star to the on-chip memory of DSP is arranged in the invalid period of CCD frame signal. During the CCD saving the star image to memory, DSP processes the data in the on-chip memory. This parallelism greatly improves the efficiency of processing. The scheme proposed here results in enormous savings of memory normally required. In the scheme, DSP HOLD mode and CPLD technology are used to make a shared memory between CCD and DSP. The efficiency of processing is discussed in numerical tests. Only in 3.5ms is acquired the five lightest stars in the star acquisition stage. In 43us, the data in five expanded windows including stars are moved into the internal memory of DSP, and in 1.6ms, five star coordinates are achieved in the star tracking stage.

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Guohui Zhou, Xiaodong Wang, and Zhihang Hao "Design and DSP implementation of star image acquisition and star point fast acquiring and tracking", Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 61500Y (19 May 2006); https://doi.org/10.1117/12.676415

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KEYWORDS

Digital signal processing

Stars

Image processing

Charge-coupled devices

Star sensors

CCD cameras

Logic

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