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跟瞄误差会引起接收光信号的衰减。为了减小跟瞄误差对星间光通信系统的影响,在跟瞄误差存在的条件下,通过选取最优光束发散角来优化链路可靠性。偏置误差是跟瞄误差的一部分,在没有偏置误差存在的情况下获得了链路可靠性的解析表达式,通过将链路可靠性进行最大化设计,获得了最优光束发散角的解析表达式。将偏置误差也考虑进去再对链路可靠性进行最大化设计,对于给定的通信速率获得了光束发散角与跟瞄误差的最佳比值的数值解及其近似解析表达式。在星间光通信中采用所设计的最优光束发散角,可在存在跟瞄误差的情况下获得良好的系统性能。
Aiming error will cause the received optical signal attenuation. In order to reduce the impact of aiming and tracking errors on the optical system, the link reliability is optimized by selecting the optimum beam divergence angle in the presence of aiming error. The bias error is a part of the tracking error, and the analytical expression of the link reliability is obtained without any bias error. By optimizing the link reliability, the optimal beam divergence angle is obtained expression. The bias error is also taken into account and the link reliability is maximized. The numerical solution of the optimal ratio of the beam divergence angle to the target tracking error and its approximate analytical expression are obtained for a given communication rate. Using the optimal beam divergence angle in inter-satellite optical communication, good system performance can be obtained in the presence of following-and-tracking errors.