对MIMO雷达参数的侦察估计及性能分析  

Reconnaissance and estimation performance analysis for colocated MIMO radar parameters

作　　者：梁浩[1] 崔琛[1] 代林[1] 余剑[1] 

机构地区：[1]合肥电子工程学院401室,安徽合肥230037

出　　处：《系统工程与电子技术》2015年第10期2272-2278,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(60702015)资助课题

摘　　要：针对多输入多输出(multiple input and multiple output,MIMO)雷达的侦察对抗问题,基于被动合成阵列技术构建了对MIMO雷达方位、辐射频率联合侦察估计的信号模型,通过多次不同速度联合谱估计算法实现了对MIMO雷达方位、频率的无模糊估计。此外,推导了多辐射源条件下方位与频率联合侦察估计的克拉美-罗界(Cramer-Rao bound,CRB)。频率已知条件下推导了对单部阵列雷达方位侦察估计的CRB表达式,并进一步分别给出了对MIMO雷达和相控阵雷达进行侦察估计的CRB闭解式,对比分析了两种体制下方位侦察估计的性能。理论分析与仿真实验表明:信号频率未知条件下,所提算法能够实现对MIMO雷达方位、频率的无模糊估计,侦察估计精度随着信噪比以及不同速度联合估计次数的增大趋近于CRB;信号频率已知条件下,对单部相控阵雷达和MIMO雷达方位侦察估计性能之比仅与相控阵雷达发射波束方向增益以及阵元个数有关。最后,仿真实验结果验证了本文理论分析的正确性和方法的有效性。Aiming at the problem of counter reconnaissance for multiple input and multiple output （MIMO） radar,the signal model of joint direction and frequency estimation based on the technique of passive synthetic ar-rays is constructed.The direction and frequency unambiguous estimation is achieved by the spatial spectrum al-gorithm based on the synthetic arrays at different velocities.Furthermore,the Cramer-Rao bound （CRB）of joint estimation for multi radiation sources is derived under unknown frequency and the CRB of direction estima-tion for single array radar is derived under known frequency.Moreover,the closed-form solutions of CRB for di-rection estimation to MIMO radar and phased array radar are respectively derived,and the estimation perform-ance of two types is analyzed and compared.The theoretical analysis and simulation results illustrate that the proposed algorithm can reach direction and frequency unambiguous estimation for MIMO radar and the estima-tion performance can achieve asymptotically CRB with the signal-to-noise and the number of synthetic arrays in-creasing in the presence of frequency unknown;The ratio of direction estimation performance between MIMO radar and phased array radar is only related with transmit beamforming gains of phased array radar and the array number in the presence of frequency known.Lastly,simulation results verify the correctness of the theoretical analysis and the effect of the proposed algorithm.

关 键 词：多输入多输出雷达 对抗侦察 参数估计 性能分析 

分 类 号：TN957[电子电信—信号与信息处理]