Parameter estimation of accelerating target based on direct phase differentiation method in LFMCW radar
To solve the parameter estimation problem of accelerating target in LFMCW (linear frequency-modulated continuous wave)radar while MTRC (migration through range cell)occurs,a direct phase differentiation method is proposed.By direct phase differentiation operation along the slow time dimension,the linear coupling of fast time and slow time is successfully removed,as well as the phase order reduction of the slow time dimension.Two dimensional FFT (fast Fourier transform)processing is carried out to the differentiated signal, and acceleration estimation can be achieved,along with the coarse estimation of the initial velocity.Then the up-sweep and down-sweep beat signals are multiplied by the compensation functions which are constructed based on the estimated parameters, respectively,and initial range and velocity can be accurately obtained through decoupling operation.Detail performances are analyzed,including the acceleration resolution,the maximum unambiguous acceleration and the SNR (signal-to-noise ratio) improvement factor.It shows that the proposed method has lower SNR threshold than secondary mixing combined DPT (discrete polynomial-phase transform)processing.Simulation results testify the efficiency of the method.
Xiao.Hui Hu.Wei-dong Yu.Wen-xian
ATR Key Lab,School of Electronic Science and Engineering National University of Defense Technology Changsha,Hunan,P.R.China ,410073
国际会议
2008 IEEE International Conference on Onformation and Automation(IEEE 信息与自动化国际会议)
张家界
英文
1142-1147
2008-06-20（万方平台首次上网日期，不代表论文的发表时间）