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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。
In the satellite laser communication, transmitter alignment error and atmospheric turbulence can cause the received signal to fade. For the array receiver with front optical amplification, the anti-fading performance of the distributed receiving array is analyzed. The research shows that the distributed receiving array has a certain restraining effect on the fading caused by the transmitter alignment error. The distance between the sub-receiving apertures in the array can be optimized according to the transmitter alignment error and the strength of the turbulence. Compared with the traditional array, the distributed array can use a narrower emission beam width, reducing the transmit power requirements. Another important characteristic of the distributed array is that when the actual transmitter alignment error standard deviation is greater than the design value, the alignment error of the transmitter can be greatly reduced by adjusting the distance between each sub-array aperture of the array Power loss.