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研究了星地激光通信中地球背景辐射及其抑制技术。推导出了不同轨道处星上终端的地球背景辐射入瞳功率理论公式,提出了固有杂散辐射的概念,并对其作了理论推导。针对一个典型的终端对其地球背景辐射进行了理论计算,并设计了不同形式的遮光系统。最后利用光学仿真软件LightTools对不同轨道高度、不同遮光系统形式的星上终端的杂散辐射进行了仿真,得到了轨道高度以及遮光系统形式对杂散辐射的影响曲线,并对其作了分析。为星地激光通信中星上终端的地球背景辐射提供了理论依据,为星上终端的遮光系统设计提供了仿真依据。
The earth background radiation and its suppression technology in star laser communication are studied. Derived the theoretical formula of the entrance pupil power of the Earth background radiation on the orbital terminal of different orbits, put forward the concept of inherent stray radiation and made a theoretical deduction. For a typical terminal, the background radiation of the earth is theoretically calculated, and different types of shading systems are designed. At last, the stray radiation of the on-board terminal in the form of different orbital height and different shading system is simulated by optical simulation software LightTools. The orbital height and the influence curve of the shading system on stray radiation are obtained and analyzed. It provides a theoretical basis for the earth background radiation of the satellite terminal in the satellite laser communication and provides the simulation basis for the design of the light shielding system of the terminal on the satellite.