MIMO-OTHR稀疏频分互补混沌调制波形设计  

Sparse Frequency Division Complementary Chaotic Waveform Design in MIMO-OTH Radar

作　　者：严茂松 洪升[1] 王玉皞[1] 艾煜 董延焘 赵志欣[1] YAN Maosong;HONG Sheng;WANG Yuhao;AI Yu;DONG Yantao;ZHAO Zhixin(School of Information Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学信息工程学院,江西南昌330031

出　　处：《雷达科学与技术》2018年第4期391-397,共7页Radar Science and Technology

基　　金：国家自然科学基金(No.61661032);江西省科技厅青年基金项目(No.20161BAB212038);江西省教育厅青年项目(No.GJJ150097)

摘　　要：针对多输入多输出超视距雷达(Multiple Input Multiple Output Over-the-Horizon Radar,MIMOOTHR),提出了一种稀疏频分正交相位编码(Sparse Frequency Division Orthogonal Phase Coded,SFDOPC)波形。考虑到超视距雷达工作在非连续分布频谱环境,设计了波形的稀疏频分结构。利用混沌序列天然的正交性、良好的抗干扰和低截获性能,将混沌序列映射为相位编码信号,调制在稀疏载波频率上。基于该波形结构,首先对混沌序列的相关性能进行了优化,利用自适应克隆选择算法最优化搜索得到互补混沌序列对;然后,根据实时监测得到的频谱环境,合理选择载频和带宽,在兼顾频谱环境的同时,可以进一步改善波形的正交性,最终得到一种稀疏频分互补混沌调制波形。仿真结果表明,该波形具备优良的输出特性。A novel sparse frequency division orthogonal phase coded(SFDOPC)waveform is proposed for multiple-input multiple-output over-the-horizon radar(MIMO-OTHR)in this paper.The sparse frequency division structure of the waveform is designed in consideration of OTHR operating in discontinuous distributed spectrum environment.Taking advantages of its orthogonality good anti-interference,low intercept performance,the chaotic sequence is mapped into phase coded signal and modulated onto sparse carrier frequency.Based on this waveform structure,the correlation performance of the chaotic sequence is optimized firstly.The adaptive clonal selection algorithm is utilized to obtain a complementary chaotic sequence pair.Then,according to the monitored spectral environment in real-time,the carrier frequency and bandwidth are selected reasonably.The orthogonality of the waveform can be further improved in the case of giving consideration to the spectral environment.Finally,a sparse frequency division complementary chaotic modulation waveform is obtained.The simulation results prove that the waveform has excellent output performance.

关 键 词：多输入多输出超视距雷达 稀疏频分 相位编码 混沌序列 自适应克隆选择算法 互补码 

分 类 号：TN958.93[电子电信—信号与信息处理]