机载激光通信链路的传输信道及性能分析

Transmission Channel and Performance Analysis for Airborne Laser Communication Link

摘要:

对于机载激光通信的传输信道，分析了大气信道中的衰减、光强闪烁、光束漂移及气动光学效应等复合效应，并推导了接收光束尺寸、链路中断概率和误码率等传输性能。仿真分析表明：一方面，接收光束尺寸受光束漂移及气动光学效应的影响而增大，且在低空条件下的光束尺寸主要受到大气湍流的影响而导致其大于高空条件；另一方面，长距离的机载激光通信链路需考虑光束漂移的影响，并可通过优化发射光束大小进行抑制。

Abstract:

As for the transmission channel in airborne laser communication, research onto combined transmission effects, including channel attenuation, intensity fluctuation, beam-wandering and aero-optics effects, are analyzed. Furthermore, transmission performances onto received beamwidth, link outage probability and bit-error rate are expressed in closed form. Simulation results show that the received beamwidth is boosted by beam-wandering and aero-optics effects, within which the value of the low altitude condition is larger than the high altitude case due to severe atmospheric effects in the low altitude case. On the other hand, the beam-wandering effect for the long-range transmission link should also be considered, and could be reduced by optimizing transmitted laser beamwidth at the transmitter end.