基于FRFT的LFMCW雷达加速动目标检测与参数估计

在线性调频连续波雷达中,目标加速度使回波多普勒信号受到速度和加速度的调制,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.采用分数阶傅立叶变换的快速算法实现了加速运动目标回波检测和加速度-速度估计,并提出了一种自适应多级搜索算法实现了加速度-速度的快速估计,该算法具有运算复杂度低、精度高的特点.另外推导出了一般高斯白噪声环境下Chirp信号参数估计的CRB界,为高斯白噪声环境下参数估计的方差提供了实际下界.

Novel method of moving target detection and parameter estimation for LFMCW radar

In the Linear FMCW radar system, the echo Doppler signal modulated by the target velocity and acceleration will cause the Doppler spectrum aberration and reduce the detection performance and parameter estimation precision. In this paper, a new method based on the fractional Fourier transform was presented, and an adaptive search algorithm was proposed. Furthermore, the paper also derives the CRB of the parameter estimation of Chirp signal in white gauss noise, providing for the real low hounds for variance of estimated parameter.