为了分析太阳辐射对卫星光通信系统造成的影响，利用太阳常数和微元法计算了辐照到目标物体表面的太阳辐射功率。结合地面通信终端的接收信号功率，分析了在太阳辐射影响下的系统信噪比和误码率，并给出了满足系统误码率10^-9条件下，发射信号功率、俯仰角以及跟瞄误差之间的关系。结果表明对日俯仰角需要被限制在一个很小的变化范围，而增大信号发射功率和减小系统跟瞄误差都是提高卫星光通信系统可靠性的有效途径。

To analyze the effect on satellite optical communication system by solar irradiation,the solar constant and micro element method are used to calculate the power irradiated on the surface of the target object.Combined with received signal power of the ground communication terminal,the system signal to noise ratio and bit error rate are analyzed.The relations between transmitted power,elevation angle and tracking error are given to ensure the system BER below 10^-9.The results show that the elevation angle towad sun needed to be limited to a small scope,and the increase of transmitted power and decrease of tracking error are both the effective ways to increase the system reliability.