一种低旁瓣方向图修正的MIMO雷达波形设计方法  

MIMO radar waveform design method via low sidelobe beampattern modification

作　　者：李奕蓉[1] 胡捍英[1] 

机构地区：[1]解放军信息工程大学导航与空天目标工程学院,河南郑州450000

出　　处：《西安电子科技大学学报》2016年第2期132-138,共7页Journal of Xidian University

基　　金：国家科技重大专项资助项目(2011ZX03003-003-02)

摘　　要：在多输入多输出雷达波形设计中,降低发射方向图旁瓣能够抑制旁瓣杂波和虚假目标能量,提高接收信噪比,从而改善角度估计性能.鉴于此,提出一种基于低旁瓣方向图修正的多输入多输出雷达波形设计方法.该方法在采用半正定松弛技术求解得到发射信号相关矩阵的基础上,通过改变信号相关矩阵的非对角线元素,建立低旁瓣方向图修正模型,对方向图旁瓣进行抑制.最后,根据修正后的信号相关矩阵获得波束加权矩阵,并采用ESPRIT算法进行到达角估计.同时,还对所提方法的可行性进行了分析.仿真结果表明,所提方法能够有效地降低方向图旁瓣,提高角度估计精度和角度分辨率.In the design of the multiple-input multiple-output（MIMO）radar waveform,decreasing transmit beampattern sidelobes could reduce the energy of clutters and false targets from sidelobes and increase the received signal to noise ratio（SNR）so as to improve the angle estimation property.Motivated by this idea,a transmit waveform design method based on low sidelobe beampattern modification is proposed for MIMO radar.First,the transmit waveform cross-correlation matrix can be obtained by the semidefinite relaxation（SDR）technique.Then the essence of our method is to establish an optimization modification model to reduce the beampattern sidelobe by changing the non-diagonal elements of the waveform cross-correlation matrix.Finally,the corresponding transmit beamforming weight matrix is obtained by this modified matrix,and the ESPRIT algorithm is used for the direction of arrival（DOA）estimation.Meanwhile,the feasibility of our method is demonstrated.Simulation results show the superiorities of our method in sidelobe suppression,DOA estimation accuracy and angle resolution.

关 键 词：多输入多输出雷达 到达角估计 波形设计 低旁瓣 发射方向图 

分 类 号：TN958[电子电信—信号与信息处理]