分布式OFDM-MIMO雷达MTI处理

分布式频分正交复用多输入多输出雷达(orthogonal frequency division multiplexing multiple input multiple output,OFDM MIMO)是一种新型雷达系统。针对该雷达的杂波抑制问题,建立了该雷达的回波模型,分析了空间分集和发射频率分集对改善因子的影响,给出了该雷达的动目标显示(meving target indication,MTI)杂波抑制方法,并分析了提出方法的性能。较之传统发射相同载频信号的MIMO雷达,分布式OFDM MIMO雷达由于频率分集带来的处理自由度能改善多普勒频率落入MTI滤波器凹口的目标的检测能力。理论和仿真实验证实了提出方法的有效性。

#br# Distributed OFDM-MIMO radar MTI process

Distributed orthogonal frequency division multiplexing multiple input multiple output (OFDM MIMO) radar is a new radar system. For the clutter suppression of this radar, the echo model of the radar is firstly built up, and then, the impact of space diversity and frequency diversity on the improvement factor is analyzed. Furthermore, the clutter suppression technique based on moving target indication (MTI) is proposed and the performance of the proposed method is analyzed. Compared to the traditional MIMO radar with the same carrier frequency signal, due to the degree of freedoms brought by frequency diversity, distributed OFDM MIMO radar can improve the detection capability of the target whose Doppler frequency falls into the notch of the MTI filter. Both theory results and simulation tests validate the availability of the proposed method.