时变参数下信息映射LPI通信波形  

Information mapping LPI communication waveform under time-varying parameters

作　　者：宁晓燕[1] 李书凯 王震铎 赵东旭 NING Xiaoyan;LI Shukai;WANG Zhenduo;ZHAO Dongxu(College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《系统工程与电子技术》2023年第5期1526-1534,共9页Systems Engineering and Electronics

基　　金：中国博士后科学基金(2020M670885);黑龙江省自然科学基金(LH2021F009);黑龙江省博士后资助经费(LBH-Z20049)资助课题。

摘　　要：以二进制正交键控(binary orthogonal keying,BOK)为传统方法调制Chirp信号的检测手段日益丰富,针对常用时频分析手段分数阶傅里叶变换和短时傅里叶变换对Chirp信号的高破译性问题,提出了一种将信息映射到Chirp信号时域的新型调制方式,即时变信息映射(time varying-information mapping,TVIM)调制,通过构建时域携带信息的调制模式,解决了周期能量聚敛特性,增加了以BOK为检测思想的信息干扰,加强了波形的低截获概率(low probability of intercept,LPI)。以数学推导和仿真分析的方法,探究了新型调制方式的误码特性、时频分析下LPI特性及先验信息抗破译性。理论分析和仿真验证表明,TVIM调制架构下,可保证比特信噪比在13 dB前误码率达到10-4,并提高了波形LPI性能。The detection methods of modulating Chirp signal by traditional methods such as binary orthogonal keying(BOK)are becoming more and more abundant.Aiming at the high deciphering of Chirp signal by common time-frequency analysis methods:fractional Fourier transform and short-time Fourier transform,a new modulation method mapping information to Chirp signal time domain is proposed,time varying-information mapping(TVIM)modulation.By constructing the modulation mode carrying information in time domain,it solves the characteristics of periodic energy convergence,increases the information interference based on the detection ideas of BOK,and strengthens the low probability of intercept(LPI)of waveform.By means of mathematical derivation and simulation analysis,the bit error characteristics of the new modulation mode,the LPI characteristics under time-frequency analysis and the anti decoding of a priori information are explored.Theoretical analysis and simulation results show that under the TVIM modulation architecture,the bit error rate can reach 10-4 before 13 dB,and the waveform LPI performance is improved.

关 键 词：低截获概率 时频分析 误码特性 时变信息映射调制 

分 类 号：TN911.6[电子电信—通信与信息系统]