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激光通信(Lasercom)在空对地通信中利用一窄光束取代无线电射频(RF)的最大优势正面临着严峻的技术挑战.在光通信中,通常以微弧度计量的传输光束宽度,尤其在空间飞行器有振动的情况下,对定向系统的精度要求甚高.不精确的光束定向能导致接收端的信号衰弱,从而产生大量的突发误差.所以在实现空—地激光通信的一个重要步骤是采用相对于发射光束宽度很小的残余定向误差跟踪目标.
Lasercom’s biggest advantage of using a narrow beam to replace radio frequency (RF) in space-to-Earth communication is facing serious technical challenges. In optical communications, the width of the transmitted beam, typically measured in micro-radians, In the case of aircraft vibration, the accuracy of the directional system is very high.An inaccurate beam orientation can lead to signal weakening at the receiving end, resulting in a large number of burst errors.Therefore, an important step in the implementation of space-to-ground laser communication is to adopt The residual directional error is tracked relative to the width of the emitted beam.