基于OFD-LFM信号的MIMO雷达微多普勒效应分析

摘要

多输入多输出(MIMO)雷达系统利用空间分集技术,能够在不同视角接收目标回波信号,与传统单基雷达系统相比,可以提取更丰富的目标特征信息,因而大大提高了雷达的目标运动参数估计精度.基于MIMO雷达系统,详细推导了正交频分线性调频信号体制下目标部件旋转引入的微多普勒效应,通过取多组观测数据的数学期望对旋转半径进行了参数估计,最后的仿真实验验证了理论分析的结果,得到的旋转半径估值与真实值非常接近.%Compared with traditional monostatic radar system, multiple input multiple output ( MIMO) radar system can receive returned signals from targets in different aspects wich respect to the transmitting/receiving radar pairs by utilizing the spatial diversity technology and can ohtain more target information, which highly improves the radars estimation accuracy of target moving parameters. Based on the MIMO radar system with orthogonal frequency division linear frequency modulation ( OFD-LFM) signals,the micro-Doppler effect caused by rotating parts of the target is deduced in detail and then the rotation radius is estimated by calculating the mathematical expectation of the obtained data. Simulations are given to validate the theoretic conclusions and prove that the estimated rotation radius obtained in is very close to its real value.