从光功率的角度,分析了卫星间长距离和出射光束发散角产生的空间传输损耗,当传输速率增加、误码率上升时,接收机灵敏度下降;讨论了不同卫星数目时传输损耗与激光束发散角的关系,在考虑其他光功率开销后,得出了发射光功率,发散角和接收灵敏度相互制约关系。 From the perspective of optical power, the spatial transmission loss caused by the long distance between the satellites and the divergence angle of the outgoing beam is analyzed. When the transmission rate increases and the bit error rate increases, the sensitivity of the receiver decreases. The transmission loss and laser beam Divergence angle, taking into account the other optical power overhead, come to the emission optical power, divergence angle and receive sensitivity mutual restraint relationship.