多载频MIMO雷达距离栅瓣抑制方法

多载频多输入多输出 (multiple-input multiple-output，MIMO）雷达采用稀布阵发射多载频调频连续波（frequency modulated continuous wave，FMCW）信号，阵列接收目标回波。分析了多载频MIMO雷达的信号模型，给出了发射接收综合处理过程，分析了距离栅瓣产生机理，讨论了子带宽和天线频差取不同值时距离栅瓣的分布情况，提出了基于加权和离散傅里叶变换 (discrete Fourier transform，DFT)的距离栅瓣抑制方法。加权法是在综合的同时完成距离栅瓣抑制，DFT法则是在脉压时完成。仿真结果表明,两种方法均能实现距离栅瓣的有效抑制。

Range grating lobes suppression in multi-frequency MIMO radar

The multi-frequency multiple-input multiple-output (MIMO) radar uses a sparsearray to transmit the frequency modulated continuous wave (FMCW) signals of multiple carrier frequencies and receives the echoes in array fashion. The signal model of the multi-frequency MIMO radar is analyzed. The synthetic-impulse and aperture processing are deduced, and how the range grating lobes are produced is analyzed. The amplitude of range grating lobes is discussed when bandwidth and frequency interval are different parameters. The methods of range grating lobes suppression based on weights and discrete Fourier transform (DFT) are proposed. The weighting method complets range grating lobes suppression while synthesizing, and the DFT method in pulse compress. The simulation results indicate the validity of the methods.