基于FPGA的高可靠数字太阳敏算法研究

Research on High Reliability Digital Sun Sensor Algorithm Based on FPGA

数字太阳敏是卫星姿态控制系统的敏感部件,对提高小卫星数字太阳敏系统的可靠性及精度具有重要意义.提出了基于FPGA的高可靠数字太阳敏算法,首先介绍了数字太阳敏系统原理,分析得出FLASH型FPGA的高可靠性能;然后利用Verilog HDL语言编写图像高斯滤波算法、太阳光斑质心提取算法,并设计了数字太阳敏系统的标定方法.实验结果显示:角度更新速率大于35 Hz,测量范围为-60°~+60°,测量精度优于0.03°,验证了数字太阳敏系统设计的合理性,表明其能够满足数字太阳敏设计要求,提高了小卫星姿态控制精度.

The digital sun sensor is a sensitive component of satellite attitude control system.It is of great significance to improve the reliability and accuracy of small satellite digital sun sensor systems.This paper proposeds the research of a high-reliability digital sun sensor algorithm based on FPGA.First,the principle of digital sun sensor system is introduced,and the high reliability performance of FLASH type FPGA is analyzed.Then the Verilog HDL language is used to realize the image Gaussian filter algorithm,the solar spot centroid extraction algorithm,and design the calibration method of digital sun sensor system.The experimental results show that the angle update rate is precede 35 Hz,the measurement range is-60°~+60°,and the measurement accuracy is excel 0.03°.The rationality of the digital sun sensor system design is verified,and the digital sun sensor design requirements are achieved,thereby improving the accuracy of the small satellite attitude control.