激光通信自适应带宽抑制抖动噪声方案研究

Research of Adaptive Bandwidth Scheme for Restraining Jitter Noise in Optical Communication

在卫星光通信系统中,星载平台的抖动使发射和接收卫星在相互瞄准时产生抖动偏差,从而使接收到的信号功率下降,信噪比降低,误码率增加.尤其是高幅抖动,虽持续时间很短,但对误码率的影响很大.针对这一问题,分析了激光星际链路的抖动模型、信号模型和性能参数模型,并在此基础上,提出了一种自适应的解决方案:根据抖动幅度自适应地调节系统带宽,以保持系统较低的误码率.

In the system of satellite optical communication, the transmitter satellite would have vibration deviation when pointing the receiver satellite because of the vibration of the whole system, which decreases the received signal and the SNR as well as increases the BER. Though high amplitude vibrations durations are short, it has dramatic effect to the whole system. In order to solve the problem, the paper analyzes the vibration model, signal model and performance model, proposes an adaptive scheme. Using the scheme, the system can adapt the transmitter bit rate and the bandwidth to the vibration amplitude to keep the BER low and constant.