基于多项相位变换的线性FMCW雷达目标加速度和速度估计方法

Method for Acceleration and Velocity Estimation of Linear FMCW Radar's Target Based on Polynomial Phase Transform

在线性调频连续波 (LFMCW)雷达中 ,加速度运动目标回波存在多普勒频谱畸变现象 ,造成目标检测性能和参数估计精度损失 .本文提出的方法首先将多普勒信号作多项相位变换 ,并在变换后的信号频谱中估计出目标的加速度 ,然后对多普勒信号进行加速度补偿 ,最后在补偿后的多普勒信号频谱中估计出目标速度 .仿真分析表明这种方法能够以较小的运算量 ,达到改善加速度运动目标的检测性能和速度估计精度的目的 .

In the Linear FMCW radar, the echo signal of moving target with acceleration has Doppler aberration which will degrade the detection performance and parameter estimation of target. Based on the Polynomial Phase Transform method, the paper first estimates the target's acceleration from the Doppler signal with the polynomial phase transformed, then compensates the Doppler signal with the estimated acceleration, finally, estimates the target's velocity from the compensated Doppler signal. The simulation indicates that the method can improve the detection performance and velocity estimation precision of the accelerated targets.