分析了空地激光通信系统中主要器件和信道对通信光功率的影响，并根据接收探测器的信噪比和通信误码率公式，建立了空地激光通信仿真系统.分析了在误码率优于10－7条件下，不同地面大气能见度所对应的最高通信速率;以及要实现通信速率为1.5 GHz，误码率优于10－7时需要的最小发射功率和最长通信距离.结果表明，当发射功率越大时，地面大气能见度对误码率的影响越明显.

The influences of main parts of an apparatus and channel to power of communication laser on spaceground optical communication slant link were analyzed. Based on the formula for signaltonoise ratio of receiving detector and bit error rate of communication, the simulation system of spaceground optical communication was established. Using the simulation system, the highest communication rates as to the different atmospheric visibilities were analyzed, the assumptions that bit error rate is superior to 10－7, the minimum transmitter power and the maximum communication distance were discussed in order to achieve the communication rate to 1.5 GHz and bit error rate is superior to 10－7. The result indicates that influence of the atmospheric visibility to the bit error rate is more obvious, when the transmitter power is greater.