光学学报, 2006, 26 (9): 1297, 网络出版: 2006-09-14
星地激光通信中分布式接收阵列的特性研究
Study on Characteristics of Distributed Array Receiver for SatellitetoGround Laser Communication
光通信技术 星地激光通信 前置光放大 分布式阵列接收 对准误差 大气湍流 optical communication technology satellitetoground laser communication optical preamplifier distributed array receiver pointing error atmospheric turbulence
摘要
星地激光通信中,发射机对准误差及大气湍流会引起接收信号衰落,对带前置光放大的阵列接收机,分析了分布式接收阵列的抗衰落性能。研究表明,分布式接收阵列对发射机对准误差引起的衰落具有一定抑制作用,阵列中各子接收孔径之间的距离可根据发射机对准误差及湍流的强弱进行优化设计。与传统式阵列相比,分布式阵列可以采用更窄的发射光束宽度,降低对发射功率的要求。分布式阵列的另一个重要特性还在于:当实际发射机对准误差标准差大于设计值时,通过调整阵列各子接收孔径之间的距离,可以在很大程度上降低发射机对准误差引起的功率损失。
Abstract
Pointing error of transmitter and atmospheric turbulence cause signal fading for satellitetoground laser communication, and the antifading characteristics of distributed groundbased array receiver with optical preamplifiers are analyzed. It is shown that the distributed array receiver can decrease the influence of pointing error of transmitter, and the distance between the subapertures can be optimized according to the pointing error of transmitter and atmospheric turbulence. Compared with the conventional array receiver, optimal transmitting beam width decreases and transmitting power requirement is debased in the distributed array receiver. Another important advantage of distributed array is when the actual rms pointing error is larger than the designed value, the power penalty can be reduced greatly by changing the distance between the subapertures.
向劲松, 胡渝. 星地激光通信中分布式接收阵列的特性研究[J]. 光学学报, 2006, 26(9): 1297. 向劲松, 胡渝. Study on Characteristics of Distributed Array Receiver for SatellitetoGround Laser Communication[J]. Acta Optica Sinica, 2006, 26(9): 1297.