星间光通信链路稳定保持时间估算

Time Estimation of the Link Stability in Inter-Satellite Optical Communications

针对目前星间光通信链路信号传输有效时间较短的问题,提出了双向激光链路跟踪稳定性的概念,分析了多种因素对跟踪稳定性的影响。综合接收信噪比、相对运动角速度和链路性能要求等因素,建立了链路稳定时间的期望公式。利用Simulink建立了双向激光通信链路跟踪仿真模型,通过仿真验证了理论公式的正确性。为实现星间光通信链路保持长时间稳定,提出在不同星间相对运动速度下采用不同控制参数的方法,实现了星间光通信终端控制策略优化,对今后卫星光通信航天工程化应用具有一定的意义。

The concept of the bidirectional laser link tracking stability in inter-satellite optical communication is proposed for the problem of short effective time of the signal transmission in the current and the influence of various factors on the tracking stability is analyzed. Considering receiving signal-to-noise ratio（SNR）, relative motion velocity, link performance requirements and other factors, expectation formulas of tracking stability time are established. A relatively complete simulation model of bidirectional laser link tracking in inter-satellite communication with Simulink is established, which can prove the correctness of the theory formula. To maintaing inter-satellite optical communication link stability for a long time, a method utilizing different control parameters at different velocities between the satellites is proposed, and the control strategy in inter-satellite optical communication terminal is optimized. The results of this paper are significant for the aerospace engineering of satellite optical communications.