星地光链路中孔径平均效应对相偏估计性能的影响  

Influence of aperture average effect on the performance of phase offset estimation in satellite-to-ground optical links

作　　者：李宏伟 黄永梅[1,3,4] 王强 彭真明[2] LI Hongwei;HUANG Yongmei;WANG Qiang;PENG Zhenming(Key Laboratory of Optical Engineering,Chinese Academy of Sciences,Chengdu 610209,China;School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院光束控制重点实验室,成都610209 [2]电子科技大学信息与通信工程学院,成都611731 [3]中国科学院光电技术研究所,成都610209 [4]中国科学院大学,北京100049

出　　处：《光通信技术》2019年第6期50-53,共4页Optical Communication Technology

基　　金：国家自然科学基金(61571096)资助

摘　　要：为了实现相干接收,提高星地光通信系统的性能,针对星地光链路的数字相干接收系统,分析了接收机孔径平均效应对相偏估计算法性能的影响;对比了当信道为常参信道(接收口径足够大)和大气湍流信道(有限接收口径)时,相偏估计性能的差别;给出了相偏估计误差与接收机孔径之间的关系曲线。仿真实验表明:当孔径在30cm以下时,相偏估计误差受孔径大小的影响较为明显。In order to achieve coherent reception and improve the performance of satellite-to-ground optical communication system,for the digital coherent receiving system of satellite-to-ground optical link,the influence of receiver aperture averaging effect on the performance of phase offset estimation algorithm is analyzed.Difference in performance of phase offset estimation is compared when the channel is a constant parameter channel(receiving aperture is large enough)and atmospheric turbulence channel(limited receiving aperture).The relationship curve between phase offset estimation error and receiver aperture is given.The simulation results show that when the aperture is below 30cm,the phase offset estimation is error obviously affected by the aperture size.

关 键 词：星地光链路 孔径平均 相偏估计 估计误差 大气湍流 

分 类 号：TN256[电子电信—物理电子学]