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基于逆向调制反射器(MRR)的空间光通信系统因其结构紧凑、可免去链路一端的捕跟(APT)系统、功耗低等优点,是空间光通信系统研究热点之一。提出采用双波长激光发射实现全双工逆向调制回复空间光通信结构,并基于该结构对强度调制解调模式,通信距离为300 km,通信速率为1 GHz下的地面站对近地小卫星全双工通信链路进行了链路计算及通信误码率的分析。当MRR端口径为0.1 m时,通信链路余量大于5 d B,通信误码率优于10-15,满足通信链路的要求。并进一步分析了仿真结果存在的缺陷。结果表明所提出的空间光通信结构在小卫星对地面站全双工激光通信是可行的,是未来空间光通信系统发展趋势之一。
Space-based optical communication system based on reverse-modulated reflector (MRR) is one of the hot topics in space optical communication system due to its compact structure, eliminating the need for the system of catch-and-hold (APT) at one end of the link and low power consumption. A dual-wavelength laser transmission is proposed to realize full-duplex reverse modulation space-back optical communication structure. Based on this structure, the intensity modulation and demodulation mode of the ground station with the communication distance of 300 km and the communication rate of 1 GHz is analyzed. Duplex communication link link analysis and error rate analysis. When the MRR port diameter is 0.1 m, the communication link margin is more than 5 d B, and the communication error rate is better than 10-15, meeting the requirements of the communication link. And further analysis of the simulation results of the shortcomings. The results show that the proposed space optical communication structure is feasible in the full-duplex laser communication of small satellites to ground stations and is one of the development trends of space optical communication systems in the future.