多载频MIMO雷达的一种新的信号处理方法

多载频MIMO雷达(Multi-Carrier MIMO radar)是指利用频率分集和空间分集的方法来实现发射信号正交的具有多个发射和多个接收天线的雷达系统，该文研究了该体制雷达基于Dechirp处理实现距离高分辨的方法，分析了IFFT相参合成法以及伪峰产生原因，提出了一种新的处理方法空域合成带宽法，它将空域分散发射的多载频LFM信号，先做Dechirp处理，然后再将通道分离后的各路信号顺序时移拼接合成一个大带宽的LFM信号，最后再对合成后的信号做IFFT处理以获得高分辨距离信息。它实现简单，能够在不增加运算量的条件下有效的抑制伪峰，并受目标运动影响小，计算机仿真验证了这些结论。

A Novel Signal Processing Approach for the Multi-Carrier MIMO Radar

Multi-carrier MIMO radar is a radar system with multiple transmitted antennas and multiple received antennas capitalizing on frequency diversity and spatial diversity to obtain orthogonality of transmitted signals and the methods based on the dechirp processing to obtain High Range Resolution (HRR) are studied in this paper. The IFFT coherent synthesis processing method and the excuse of spurious peaks are analyzed and then a novel signal processing method, Spatial Domain Synthetic Bandwidth (SDSB) approach, is proposed. The multiple carrier frequency LFM return signals transmitted spatially diversity are first deramped by the dechirp processing and then the individual channel signals after the channel separation are combined into an LFM signal with a larger bandwidth by time shift in sequence. Finally the IFFT processing is applied to the concatenated signal to achieve HRR. The approach can be implemented easily, can avoid the spurious peaks effectively without the addition of computation and has a slightly influence on the moving target. Finally the simulation results on the computer validate these conclusions.