以空间链路方程为基础,详细推导了具有不同像差时的星间相干光通信接收系统信噪比表达式。以通信距离为60000km、速率为2Gb/s的2PSK零差同步轨道接收系统为例,通过数值仿真,全面比较了接收天线的倾斜、离焦、彗差和像散等像差对接收系统误码率(εBER)的影响。结果表明,不同像差单独作用时,倾斜像差的影响最大,象散的影响最小;不同像差相互作用时,它们中的某些能部分实现相互校正,从而降低误码率。以εBER≤10-6为比较标准,当彗差W31/λ≤1.00时,调整倾斜像差能实现它们之间的部分校正;当像散W22/λ≤0.53时,调整离焦能对像散进行部分校正。因此,在设计接收系统时,接收天线的像差所产生的影响不容忽视。这将为设计星间相干通信接收系统提供必要的理论依据。 Based on the space link equation, the signal-to-noise ratio (SNR) expression of the ISI receiving system with different aberrations is deduced in detail. Taking the 2PSK zero-difference synchronous tracking receiving system with a communication distance of 60000km and a rate of 2Gb / s as an example, the errors of the receiving antenna such as tilt, defocus, coma and astigmatism are systematically compared by numerical simulation Rate (εBER) effects. The results show that when different aberrations are applied alone, the effect of oblique aberration is the greatest, and astigmatism has the least influence. When different aberrations interact, some of them can partially correct each other and reduce the bit error rate. To εBER ≤ 10-6 as a comparative standard, when the coma aberration W31 / λ ≤ 1.00, adjusting the tilt aberration to achieve partial correction between them; when the astigmatism W22 / λ ≤ 0.53, adjust the defocus energy astigmatism Partial correction. Therefore, the design of the receiving system, the receiving antenna aberration caused by the impact can not be ignored. This will provide the necessary theoretical basis for designing the ISS receiving system.