非Kolmogorov大气湍流下部分相干光偏振状态对相干探测灵敏度的影响研究  

The Influence of Polarization State of Partially Coherent Beam on Coherent Detection Sensitivity in Non-Kolmogorov Atmospheric Turbulence

作　　者：吴加丽 惠玉泽 丁德强 柯熙政[1] WU Jia-li;HUI Yu-ze;DING De-qiang;KE Xi-zheng(Faculty of Automation&Information Engineering,Xi'an University of Technology of China,Xi'an,Shaanxi 710048,China;School of Information and Communication,National University of Defense Technology,Wuhan,Hubei 430019,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048 [2]中国人民解放军国防科技大学信息通信学院,湖北武汉430019

出　　处：《电子学报》2023年第5期1370-1380,共11页Acta Electronica Sinica

基　　金：陕西省科研计划项目(No.18JK0341);陕西省重点产业创新项目(No.2017ZDCXL-GY-06-01);西安市科技计划项目(No.2020KJRC0083);国防科技大学自主创新科学基金项目(No.22-ZZCX-051)。

摘　　要：本文讨论了在非Kolmogorov湍流下部分相干电磁高斯-谢尔模型(Electromagnetic Gaussian-Schell Model,EGSM)光束用于相干探测时系统的性能.基于相干探测理论推导了EGSM光束在非Kolmogorov湍流下斜程传输时系统灵敏度的表达式.研究了在误码率为10-9下上行和下行传输时光束在不同偏振状态、功率谱幂律、湍流尺度、传输距离、天顶角、探测器参数、接收端高度或光源高度对相干探测系统灵敏度的影响.结果表明:在非Kolmogorov湍流谱下,系统灵敏度会随着功率谱幂律的增大而增大;在相同条件下,上行传输时的系统探测灵敏度大于下行传输;在链路条件相同的情况下,完全偏振的EGSM光束用于相干探测时的灵敏度均比非偏振光束的灵敏度大3 dBm.最后,建立了EGSM光束相干探测系统,通过实验验证了部分偏振EGSM光束用于相干探测的系统灵敏度介于完全偏振和非偏振之间.This paper mainly discusses the performance of partially coherent electromagnetic Gaussian-Schell model(EGSM)beam for coherent detection under non-Kolmogorov turbulence.Based on the coherent detection theory,the ex-pression of the sensitivity of the EGSM beam is derived when it propagates in the slant path under non-Kolmogorov turbu-lence.Under the condition of bit error rate of 10-9,the effects of coherent beam in different polarization states,power spec-trum power law,turbulence scale,propagation distance,zenith angle,detector parameters,receiver height and beam source height on the sensitivity of the coherent detection system are studied in the uplink and downlink atmospheric turbulence.The results show that,under the non-Kolmogorov turbulence spectrum,the system sensitivity increases with the rise of pow-er spectrum power law.Under the same conditions,the detection sensitivity of uplink propagation is greater than that of downlink propagation.Under the same link conditions,the sensitivity of completely polarized EGSM beam for coherent de-tection is 3 dBm greater than that of the unpolarized beam.The EGSM beam coherent detection system is established,and the experiments verify that the sensitivity of partially polarized EGSM beams is between that of completely polarized and unpolarized ones.

关 键 词：相干探测灵敏度 EGSM光束 偏振状态 非Kolmogorov湍流 斜程传输 

分 类 号：TN919.21[电子电信—通信与信息系统]