面向通雷一体化的啁啾调制倍频LFM产生研究  

Chirp Modulated and Frequency Mutiplied LFM for Communication Radar Integration

作　　者：周逸潇 赵尚弘[1] 李轩[1] 王国栋 林涛[1] 朱子行[1] 黄蓝锋 李赫 Zhou Yixiao;Zhao Shanghong;Li Xuan;Wang Guodong;Lin Tao;Zhu Zihang;Huang Lanfeng;Li He(Communication System Teaching and Researching Office,College of Information and Navigation,Air Force Engineering University,Xi'an,Shaanxi 710077,China)

机构地区：[1]空军工程大学信息与导航学院通信系统教研室,陕西西安710077

出　　处：《中国激光》2022年第7期80-90,共11页Chinese Journal of Lasers

基　　金：国家自然科学基金(61901507,62001505)。

摘　　要：提出一种基于啁啾极性调制的线性调频(LFM)信号光学产生和应用方案。利用两台并联的马赫-曾德尔调制器和一台相位调制器产生跳频载波,将单啁啾LFM信号调制到该载波上,经过光电转换后,可以产生啁啾极性可调的LFM信号,且实现了载频和带宽的四倍频。仿真验证了所提方案产生倍频LFM信号、测量多普勒频移以及在无线通信上应用的可行性。输入频率为4~6 GHz和5~6.5 GHz的LFM信号时可分别产生16~24 GHz与20~26 GHz的三角波调频信号,时宽带宽积扩展为8倍;对速度为800 m/s的运动目标进行速度测量,并利用模糊函数分析该信号对距离多普勒耦合问题的改善效果;在通信功能的仿真验证中,接收端匹配滤波成功恢复出码率为0.1 Gbit/s的10位二进制序列。所提方案结合了啁啾极性调制和微波光子倍频技术,可产生三角波调频信号,从而实现雷达的速度、距离联合测量,提升雷达探测分辨率,并且利用啁啾极性调制实现通雷一体化应用。Objective Linear frequency modulation(LFM)signals,as a spread spectrum signal,are widely used in radardetection and wireless communication due to their superior pulse compression performance.Photonics methods canbe adapted to generate LFM signals with improved frequency and bandwidth,enhanced flexibility,andelectromagnetic interference immunity.Previously,most schemes only generated single-chirped LFM signals,whichhave the range-Doppler coupling problem when detecting moving targets.Although a dual-chirped LFM signal solvesthe above-mentioned problems,the signal has power fluctuations,which can deteriorate detection performance.Other studies have proposed schemes based on amplitude shift keying(ASK)and phase shift keying(PSK)forcombining LFM signal generation and communication modulation.However,ASK modulation causes significantpower loss to the LFM signal,which shortens the radar detection range.Although schemes based on PSK modulationcan avoid power loss,large phase noise was introduced into the generated signal.To solve these problems,wepropose a scheme for optical generation and application of chirp polarity-modulated LFM signal.A LFM signal withquadrupled carrier frequency and bandwidth is generated through optical microwave frequency multiplication.Furthermore,communication applications can be realized by modulating the chirp polarity of the LFM signal,therebysolving the range-Doppler coupling problem using the generation of triangular wave frequency modulation signal.Methods In the proposed scheme,two parallel Mach-Zehnder modulators working at maximum transmission pointsand a phase modulator are used to generate carrier frequency hopping signals.Moreover,the single-chirp signal ismodulated on the carrier signal.After photodetection,a chirp polarity modulated LFM signal is generated with itscarrier frequency and bandwidth expanded up to four times.Results and Discussions The spectra of input and output LFM signal(Fig.9)show that the carrier frequency and bandwidth of the input signal is expanded by three t

关 键 词：光通信 线性调频信号 啁啾调制 时宽带宽积 三角波调频信号 通雷一体化 

分 类 号：TN975[电子电信—信号与信息处理] TN974[电子电信—信息与通信工程]