提出了一种基于DPT-CZT处理的速度-加速度联合估计方法。根据差拍信号相位在快、慢时间轴上的二维联合特性,沿其慢时间维进行DPT处理,可以消除快、慢时间线性耦合项,同时实现了慢时间维相位的降阶处理,从而可以获得目标速度-加速度的联合估计。为确保速度估计的无模糊性,采用CZT变换对目标可能存在的频段进行密集采样以提高频率测量的精度。给出了速度-加速度联合估计的具体实现步骤以及CZT处理中参数的确定。基于速度、加速度估计值对差拍信号进行补偿,从而可以对速度估计进行进一步修正并获取目标距离的估计。仿真结果验证

To solve the parameter estimation problem of accelerating target in LFMCW(linear frequency-modulated continuous wave) radar when MTRC(migration through range cell) occurs,a joint estimation method of velocity and acceleration based on DPT-CZT processing is proposed.According to the two-dimensional joint characteristics of the beat signals phase,DPT(discrete polynomial-phase transform) along the slow time dimension is carried out,which not only removes the linear coupling of fast time and slow time,but also reduces the order of phase in slow time dimension.Thus joint estimation of velocity and acceleration is achieved.To guarantee the unambiguity of velocity estimation,CZT(Chirp-Z transform) is adopted to sample densely in the band in which the target may exist to improve the accuracy of frequency estimation.The key steps for joint estimation of velocity and acceleration are given,along with determination of the parameters used in CZT.Finally,the beat signals are compensated to further modify velocity estimation and to extract the range information of the target Simulation results verified the efficiency of the method.

TN958.94