基于时间反转的MIMO雷达多目标DOA估计

摘要

For Direction Of Arrival(DOA)estimation problem of multi-target in the MIMO radar, a DOA estimation method of multi-target in the MIMO radar based on Time Reversal(TR)is proposed. Firstly,according to the received signal model of MIMO radar,we use TR theory to establish the received signal model of TR MIMO radar.Then,the received signal of TR MIMO radar is performed with matched filter and vectorized processing on the basis of the waveform diversity of MIMO radar, which extends the virtual aperture of MIMO radar.Finally,the MUSIC(Multiple Signal Classification) algorithm is used to estimate the DOAs,improving the estimation accuracy greatly. Compared with the conventional MIMO,TR MIMO can effectively improve the echo signal gain and increase the virtual aperture. The simulation results show that TR MIMO can accurately estimate the angles even when the SNR is-20 dB,which demonstrates the better performance of TR MIMO.%针对MIMO(Multi-input Multi-Output)雷达多目标DOA(Direction Of Arrival)估计问题,提出一种基于时间反转(Time Reversal,TR)的MIMO雷达多目标DOA估计方法.首先,算法根据MIMO雷达接收信号模型,采用时间反转理论,建立TR MIMO雷达接收信号模型;随后,利用MIMO雷达波形分集特性对TR MIMO雷达接收信号匹配滤波并进行向量化处理,扩展了MIMO雷达的虚拟孔径;最后,采用MUSIC(Multiple Signal Classification)算法进行多目标DOA估计,有效提高了精度.与常规MIMO相比,TR MIMO能够有效提高回波信号增益和增大虚拟孔径.计算机仿真结果表明,在信噪比-20 dB的条件下,TR MIMO雷达仍能准确地估计出目标的角度,表明TR MIMO雷达具有更好的性能.