一种适用于MIMO雷达的距离-角度耦合去除新方法  

A new range-angle coupling removal method suitable for MIMO radar

作　　者：王久友 刘传保[1] 张二伟[1] WANG Jiuyou;LIU Chuanbao;ZHANG Erwei(Nanjing Research Institute of Electronics and Technology,Nanjing 210039,China)

机构地区：[1]南京电子技术研究所,江苏南京210039

出　　处：《现代电子技术》2023年第1期6-11,共6页Modern Electronics Technique

基　　金：中国电子科技集团公司技术创新基金(KJ1903005)。

摘　　要：在MIMO雷达中使用频分复用波形时,波束合成后会产生距离-角度耦合现象。为保证MIMO雷达测角、测距的正确性,需通过波形设计、信号处理等手段消除该耦合的影响。针对当前研究在该方面存在的不足,结合理论推导和仿真分析,提出一种去除距离-角度耦合的新方法。该方法通过先后发射顺序载频和逆序载频的两组正交波形,并对两组回波信号在时域进行复数相乘完成信号间的相位补偿,从而实现了数字波束合成后距离-角度耦合的消除。创新点在于推导出了频分复用MIMO雷达的模糊函数,给出了距离-角度耦合关系式,指出了距离-角度耦合的本质,并给出了一种有效的去除方法。通过仿真对该方法的探测性能进行了验证,结果表明,与传统MIMO雷达处理方法相比,该方法可以有效地去除距离-角度耦合,同时还降低了距离副瓣水平,具有较高的应用价值。When frequency division multiplexing waveform is used in multiple-input multiple-output(MIMO)radar,rangeangle coupling will occur after beam combination.It is necessary to eliminate the influence of the coupling by means of waveform design and signal processing to ensure the correctness of angle measurement and ranging of MIMO radar.In view of the insufficiencies of current research in this field,a new method of removing the range-angle coupling is proposed in combination with theoretical derivation and simulation analysis.In this method,two groups of orthogonal waveforms of sequential carrier frequency and reverse carrier frequency are transmitted successively,and the phase compensation between the two groups of echo signals is completed by complex multiplication in time domains to eliminate the range-angle coupling after digital beam combination.The innovation of this paper lies in deducing the ambiguity function of frequency division multiplexing MIMO radar,giving the relational expression of range-angle coupling,pointing out the nature of range-angle coupling and giving an effective removal method.The detection performance of this method was verified by simulation.The results show that,in comparison with the traditional MIMO radar processing method,the method can effectively remove the range-angle coupling,and also reduce the range side lobe level,which has high application value.

关 键 词：MIMO雷达 距离-角度耦合消除 系统模型 模糊函数推导 相位补偿 性能验证 

分 类 号：TN957-34[电子电信—信号与信息处理]