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卫星激光通信光束的传播在空间属于远场衍射,而在地面光学跟踪检验中属于近场衍射。采用菲涅耳衍射理论研究了远场衍射和近场衍射对于产生光学跟踪位置误差信号的本质上的差别并且分析了等效条件,证明了近场检验中采用卫星相对角度运动轨迹的光束扫描可以准确模拟远场相对运动,同时也得到了光斑特性和卫星抖动模拟的分析。澄清了卫星激光通信终端光学跟踪性能检验中的基本概念,具有实际指导意义。
The satellite laser communication beam spreads far-field diffraction in space and belongs to near-field diffraction in the ground optical tracking test. Fresnel diffraction theory is used to study the fundamental difference between far-field diffraction and near-field diffraction for generating optical tracking position error signals and the equivalent conditions are analyzed. It is proved that the beam scanning using the relative angular trajectory of satellite can be Accurately simulate the far-field relative motion, and also get the analysis of spot characteristics and satellite jitter simulation. Clarified the basic concept of optical tracking performance test of satellite laser communication terminal, which has practical guiding significance.