星敏感器图像处理系统的并行流水线操作研究

Research on Parallel Processing and Pipelining of Star Sensor Image Process System

随着天文导航和航天测控领域的要求不断提高,对星敏感器的动态性能提出了越来越高的要求。本文详细分析了星敏感器CCD处理模块输出信号的时序关系,在此基础上提出了CCD和DSP并行流水线的处理机制以提高星图处理的效率,并利用CPLD和DSP的HOLD方式实现了CCD和DSP的并行流水线操作。通过星光模拟器的静态测试表明:利用该处理机制能实现每秒10帧的处理速度。只要合理地安排好行场有效期和消隐期的时间,会进一步提高姿态捕获的速度。

With the rising requirement of stellar navigation and spacecraft measurement and control, the requirement of dynamic performance of star sensor is increasing. In this paper, the output signal time schedule of CCD processing module in star sensor is analyzed in detail, then the parallel processing and pipelining is presented for improving the efficiency of star image processing. The parallel processing and pipelining between CCD and DSP are realized by using HOLD of DSP and CPLD. Static test simulation shows that the rate of 10 samples per second can be achieved. And the better attitude acquisition rate can be obtained when the line and frame valid and invalid period of CCD are fitly arranged.