摘要
多载波体制的雷达通信共享信号主要采用正交频分复用(orthogonal frequency division multiplexing,OFDM)技术进行设计。基于OFDM的雷达通信共享信号的循环前缀具有消除码间串扰、维持各个子载波正交的重要作用。但循环前缀会使信号模糊函数产生“伪峰”,降低能量利用率,影响雷达性能。针对该问题,提出了一种利用空白保护间隔的方法,在不影响通信质量的前提下消除“伪峰”,同时有效降低模糊函数的峰值旁瓣比。在此基础上进一步利用互补P4码和OFDM相结合的方式生成新的雷达通信共享信号。经仿真验证,相比于16阶正交幅度调制(16QAM)与OFDM相结合生成的16QAM-OFDM信号,新的雷达通信共享信号距离模糊图的峰值旁瓣比降低了1.871dB。
The radar communication shared signal of multi-carrier system is mainly designed by orthogonal frequency division multiplexing(OFDM).The cyclic prefix in the radar communication shared signal based on OFDM plays an important role in eliminating intersymbol crosstalk and maintaining the orthogonality of each subcarrier.However,cyclic prefix causes"pseudo peak"of signal ambiguity function,reduces energy utilization and affects radar performance.To solve the problem,a method of using blank guard interval is proposed to eliminate the"pseudo peak"without affecting the communication quality,and to effectively reduce the peak sidelobe ratio(PSLR)of ambiguity function.On the basis of the method,a new radar communication shared signal is generated by the combination of complementary P4 code and OFDM.The simulation results show that compared with the shared signal based on 16 quadrature amplitude modulation and OFDM(16 QAM-OFDM),the peak sidelobe ratio of range ambiguity map of the new radar communication shared signal is reduced by 1.871 dB.
作者
吴振南
姚瑶
张文旭
代雪飞
张发洋
WU Zhennan;YAO Yao;ZHANG Wenxu;DAI Xuefei;ZHANG Fayang(College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,Heilongjiang,China;Key Laboratory of Advanced Marine Communication and Information Technology,Ministry of Industry and Information Technology,Harbin Engineering University,Harbin 150001,Heilongjiang,China;Shanghai Radio Equipment Research Institute,Shanghai 201109,China;Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space,Ministry of Industry and Information Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,Jiangsu,China)
出处
《制导与引信》
2022年第1期29-34,55,共7页
Guidance & Fuze
基金
南京航空航天大学电磁频谱空间认知动态系统工信部重点实验室基金(KF20181904)
黑龙江省自然科学基金(LH2020F020)。
关键词
雷达通信共享信号
模糊函数
空白保护间隔
互补P4码
radar communication shared signal
ambiguity function
blank protection interval
complementary P4code
作者简介
吴振南(1999-),男,硕士研究生,主要从事干扰侦查与被动探测技术研究。
