卫星光通信中恒星背景噪声分析及抑制方法研究

Analysis of stellar background noise and study of restraining methods in satellite optical communication

建立了以恒星目视星等、等效温度为参数的恒星辐射谱模型,使利用恒星数据库进行背景噪声分析变得更加简捷。在此基础之上,分析了恒星自身特点及卫星光通信终端参数对背景噪声的抑制能力,提出并定义了抑制参数Ψ,以评价卫星光通信系统的抗噪性能;同时考虑背景噪声光功率对卫星光通信的影响,给出了补偿方法;分析结果表明,通过提高CCD采样频率、降低光学系统带宽等方法,可以有效地减少恒星噪点,降低恒星背景光对卫星光通信系统的影响。该项工作为进一步优化卫星光通信系统参数,提高其空间运行的稳定性打下了基础。

A new stellar radiation spectral function was produced to convenience the background noise analysis of satellite optical communication system. With this function, the relationship between stellar background noise and the system parameters was found and the restraining methods were proposed. The methods were proved effective by computer simulation. A new system parameter Φ was proposed to evaluate the noise restraining performance of the system. This work is the foundation of parameters optimization to increase the stability of satellite optical communication system.