双基地MIMO雷达的高速运动目标定位方法

High speed moving target localization method for bistatic MIMO radar

高速运动目标的大多普勒频率会导致传统匹配滤波器严重失配,因此当目标高速运动时多输入多输出(multiple input multiple output,MIMO)雷达利用传统匹配滤波器无法有效地形成虚拟阵列。研究了利用双基地MIMO雷达实现多个高速运动目标交叉定位的方法,采用降低雷达距离分辨率的方式以获取较长时间的相参积累,并将接收阵列回波信号与发射信号共轭相乘后的数据进行频域处理,有效形成了虚拟阵列,然后利用传统超分辨算法对在相同粗距离分辨单元上的高速运动目标的发射角和接收角进行联合估计,从而能够有效交叉定位多个在距离上无法分辨的高速目标。仿真结果表明了所提方法的可行性和有效性。

Large Doppler frequency produced by high speed moving target causes the serious mismatch of the traditional matched filter. Thus the virtual array of the multiple input multiple output （MIMO） radar cannot be formed by the traditional matched filter when the speed of target is high. The bistatic MIMO radar, in which the range resolution of radar is reduced to achieve the detection within a long coherent observation period, is used for high speed moving target localization. The frequency domain processing after the conjugate multiplica- tions between the returned signals and the transmitted waveforms is exploited to form the virtual array. A joint launching angle and arrival angle estimation via the traditional supper-resolution algorithm can be used for cross localization of the high speed moving targets located at the same rough range bin. The simulation results indicate the feasibility and validity of the proposed method.