毫米波LFMCW雷达加速运动目标回波检测与加速度-速度估计

DETECTION IN MILLIMETER LFMCW RADAR TARGET ECHO AND ACCELERATION-VELOCITY ESTIMATION

在毫米波线性调频连续波(LFMCW)雷达中,目标加速度存在使回波多普勒信号受到二次项调制,造成多普勒频谱畸变,从而导致目标检测性能下降和参数估计精度损失.采用最大似然模型进行加速运动目标检测和加速度-速度估计,提出了适合在一般高斯噪声环境中(包括色噪声)该模型的速度-加速度联合估计快速算法.另外也推导出了一般高斯环境下Ch irp信号参数估计的CRB界,为一般高斯环境下Ch irp信号参数的方差提供了实际下界.

In the millimeter Linear FMCW radar system, the echo Doppler signal quadratic modulated by the target acceleration will cause the Doppler spectrum aberration and reduce the detection performance and parameter estimation precision. In this study, an optimal model based on the Maximum Likelihood （ML） method and its fast algorithm for velocity and acceleration estimation fitted for Gaussian noise were presented. Furthermore, the CRB of the parameter estimation of LFM under normal gauss circumstance was also derives. It provides the real low bounds for variance of estimated parameter.