A FrFT Based Algorithm for Doppler Frequency Rate Estimation from LFM Coherent Pulse Train
基于FrFT的LFM相参脉冲信号多普勒频率变化率估计算法

LFM signal is widely used in radar application. It is a key technology to obtain the high accuracy estimation of the Doppler frequency rate from the observed LFM signals. In this paper, a Fractional Fourier Transform (FrFT) based Doppler frequency rate estimation algorithm is proposed. The signal energy is congregated in the fractional Fourier transform domain. The signal to noise rate is strengthen and the infection of the frequency rate of LFM signal is eliminated. The coherent phase information is utilized to obtain the Doppler frequency rate estimates. The theoretical analysis indicates that the estimation variance approaches the theoretical low band. The simulation results validate the presented algorithm.