第22卷第5期 2014年5月
文章编号
1004-924X(2014)05-1204-08
光学精密工程
Optics and Precision Engineering
星地相干激光通信中的自适应光学
系统边界参数设计
黄健·，张鹏'，邓科"，蒋大钢，幺周石？
Vol.22No.5
May.2014
（1.电子科技大学航空航天学院，四川成都610504;2.中国空间技术研究院西安分院，陕西西安710000）校正下相干效率和误码概率的动态特征；然后，研究了大气闪烁对相干效率和通信误码率的影响。在假设接收强度均匀分布的前提下建立了波前残差均方根值与相干效率的理论关系，采用频率直方图方法仿真了相效率以及相应的误码概率的概率分布函数，计算了不同校正残差和闪烁条件下的通信平均误码率。结果表明：波前残差大于1rad时，相干效率主要受波前残差影响，自适应校正性能达到衍射极限时才能获得10-*的误码率，但此时大气闪烁可能会使误码率增大两个数量级，
关键调：相干激光通信；大气满流；自适应光学系统；波前误差；大气闪烁；误码率
中图分类号：TN915
文献标志码：A
doi; 10, 3788/OPE. 20142205. 1204
Boundaryparametersofadaptiveopticalsysteminsatelliteto
groundcoherentlasercommunicationsystem
HUANG Jian'',ZHANG Peng',DENG Ke',JIANG Da-gang',YAO Zhou-shi?(1.School of Astronautics&Aeronautics,Universityof Electronic Science and
Technology,Chengdu 610054,China;
2.Xi'an Branch of China Academy of Space Technology,Xi'an 710000, China)
Correspondingauthor,E-mailcomahj@126.com
Abstract; The relationship between the residual wavefront error of an adaptive optical system and the coherence efficiency in a satellite to ground coherent Binary Phase Shift Keying(BPSK) laser commu-nication system was explored. The dynamic characteristics of coherence efficiency and the Bit Error Probability(BEP) under adaptive optical correction were discussed,then the influence of atmospherical scintillation on the Bit Error Ratio(BER) of coherent laser communication was analyzed. The theoreti cal relationship between the Root Mean Square(RMS) of residual wavefront error and the coherence efficiency was derived under an assumption of the uniform intensity distribution. Through the histo-gram frequency method, the cumulative distribution function of coherence efficiency and BEP were simulated, and the mean BER of communication system was calculated. The results show that the co-herence efficiency is mainly affected by the residual wavefront error when the RMS of residual wave front error is above 1 rad., Moreover, the BER can reach 1o* level when the adaptive correction achieves diffraction limit. In this case, the BER from atmospherical scintillation may increase 1oo times.
Keywords: coherent laser communication; atmospheric turbulence; adaptive optical system; wavefront
error;atmospherical scintillation;Bit Error Rate(BER) 收稿日期：2013-10-13；修订日期：2013-12-12.
基金项目：中国科学院自适应光学重点实验室开放基金资助项目（No.LA0F201304）；中国高校基本科研业务费专
项资金资助项目（No.ZYGX2011J123）