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空间相干激光通信终端中的跟瞄(PAT)系统性能直接影响通信质量。在通用的相干接收机系统中加入CCD和图像处理软件,在对传输信号进行相干探测的同时可得到目标位置误差信息,实现发射光束的实时调整。给出了干涉场强的理论表达式以及图像参数与目标位置的关系式,并讨论了实际应用中波长抖动对位置误差探测精度的影响。通过计算机仿真,验证了目标位置相干探测原理以及波长扰动分析的正确性。
Tracking (PAT) system performance in spatially coherent laser communications terminals has a direct impact on the quality of communications. By adding CCD and image processing software to the common coherent receiver system, the target position error information can be obtained while coherently detecting the transmitted signal to realize the real-time adjustment of the emitted light beam. The theoretical expression of interference field strength and the relationship between the image parameters and the target position are given, and the influence of wavelength jitter on the detection accuracy of position error is discussed. Through computer simulation, the principle of coherent detection of target position and the correctness of wavelength disturbance analysis are verified.