摘要
研究了大气湍流信道下无人机全光中继(optical amplify-and-forward,OAF)激光通信的误码率性能。为了减小大气湍流的影响,改善系统的误码率性能,同时实现较远距离的数据下传,本文基于掺饵光纤放大器(Erbium Droped Fiber Amplifier,EDFA)和光学硬限制器(optical hard-limiter,OHL)结合的无人机平台,同时采用高空水平传输和单输入多输出(single input multiple output,SIMO)技术斜程传输的两跳中继模式。在基于正态分布和双伽马(Gamma-Gamma)湍流模型下,分析了指向误差、中继距离、天顶角、束散角及平台高度等对误码率性能的影响。仿真结果表明,无人机OAF系统可以有效改善较远距离通信的数据下传误码率性能;当发射功率P_(t)=19 dBm,阈值功率P_(th)=-31 dBm,N=3时,最优发散角为0.8~1.2 mrad,天顶角控制在45°内时,可以在6 km的中继系统中得到10^(-6)系统误码率性能。
In this paper,the bit error rate performance of UAV all-optical relay laser communication system under atmospheric turbulence channel is studied.In order to reduce the influence of atmospheric turbulence,improve the bit error rate performance of the system,and realize the long-distance data transmission,a two-hop relay mode based on a combination of Erbium Droped Fiber Amplifier(EDFA)and optical hard-limiter(OHL)is adopted for UAV platform with both high-altitude horizontal transmission and single input multiple output(SIMO)technology for ramped transmission.Besides,based on a normal distribution and double gamma turbulence model,the effects of pointing error,relay distance,zenith angle,beam scatter angleand platform height on BER performance are analyzed.Simulation results show that UAV OAF system can effectively improve the BER error rate performance of data transmission over long distance.When the transmitting power=19dBm,threshold power=-31 dBm,N=3,the optimal divergence angle is 0.8~1.2 mrad,and zenith angle is controlled within 45°,10-6 system BER performance can be obtained in 6km relay system.
作者
唐翰玲
李勇军
邵龙
韩健
TANG Han-ling;LI Yong-jun;SHAO Long;HAN Jian(School of Information and Navigation,Air Force Engineering University,Xi′an 710077,China;Shijiazhuang Flight College of PLA Air Force,Shijiazhuang 050000,China)
出处
《激光与红外》
CAS
CSCD
北大核心
2023年第7期1066-1072,共7页
Laser & Infrared
基金
空军工程大学创新实践基金项目(No.CXJ2021078)资助。
关键词
激光通信
无人机
全光中继
大气湍流
误码率
laser communications
unmanned aerial vehicles
all-optical relay
atmospheric turbulence
BER
