星间光通信中球差和彗差对信号光远场特性的影响

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星间光通信中,波前畸变是影响信号光远场特性的主要因素。分析了球差和彗差对信号光远场分布、天线接收光功率的影响,引入了畸变衰减因子,给出了畸变衰减因子与波前畸变均方根(RMS)值的关系。理论分析和数值仿真结果表明,球差和彗差畸变越大,对天线接收功率的影响越大。在天线对准的条件下,当彗差和球差畸变均方根值分别约为0.120λ和0.135λ时,天线的接收功率为无畸变时的1/2。彗差对天线接收功率的影响主要是峰值移动造成的,球差对天线接收功率的影响主要是次峰的增强造成的。
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