混合MIMO-相控阵雷达目标高分辨成像

为了兼顾相控阵雷达成像和多输入多输出雷达成像的优势，提出一种基于混合MIMO-相控阵技术的多目标高分辨成像方法。将传统MIMO雷达中的每个单阵元发射天线都用一个工作在混合MIMO-相控阵模式的发射阵列（TA）来代替，每个TA根据目标数量和目标方向划分为多个子阵（SA），每个SA内部阵元工作于相控阵模式并形成指向某个方向目标的发射波束，而各个SA之间发射彼此正交的波形，从而工作在MIMO模式。对各SA的回波信号进行波束形成处理以获得更高的信噪比和信干比增益。在此基础上，结合字典优化、正交匹配追踪和参数化稀疏表征方法，分别提出单次快拍高分辨成像和多次快拍高分辨成像方法。仿真结果表明:所提方法能够获得更好的成像性能和成像实时性。

A High Resolution Imaging with Hybrid MIMO Phased Array Radar

Both the advantages of phased array radar imaging and the multiple input multiple output (MIMO) radar imaging being taken into consideration, a multi-target high-resolution imaging method based on hybrid MIMO phased array technology is proposed. In the method, the transmit array (TA) is used to replace the transmit antenna in the traditional MIMO radar, and the TA works in the hybrid MIMO phased array mode. Each TA is divided into multiple sub-arrays (SA) according to the number andthe direction of targets. The internal element in each SA works in the phased array mode to form a transmission beam into pointing to a target in a certain direction, while each SA transmits mutually orthogonal waveforms, workingafter MIMO mode. Beam-forming of the echo signal of each SA can obtain higher signal-to-noise ratio (SNR) and signal-to-interference ratio (SIR). On this basis, a single shot high-resolution imaging method and a multiple shot high-resolution imaging method are proposed respectively in combination with the dictionary optimization, the orthogonal matching pursuit and the parametric sparse representation. The simulation results show that the proposed method can achieve better imaging performance and real-time imaging.