当潜艇地100米海底时，要建立安全的通信链路，把光子激光发射到卫星上去，再由卫星转发回基地。
To establish a secure link while remaining 100 metres underwater, submarines could transmit photons of laser light to satellites, for retransmission to base.
衰落余量决定链路可靠性并影响信道发射功率和用户容量的数值。
The fading margin determines the performance of the link and affects the channel transmit power and the value of the user capacity.
实际星地光通信系统的发射光束为高斯型的情况下，跟瞄误差和大气闪烁是星地激光链路中的主要信道噪声源。
The transmitter beam is Gaussian for real satellite-ground laser communication system. The pointing jitter and atmospheric scintillation are the main noise sources for satellite-ground laser link.
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