Friday, May 27, 2016
Abstract-An Effective Nonlinear Phase Compensation Method for FMCW Terahertz Radar
Bin Deng ; Hongqiang Wang ; Yuliang Qin ; Kang Liu
The nonlinearity of signal usually leads to the range profile blurring and defocusing in the terahertz (THz) radar ranging, which should be compensated to achieve a well-focused range profile. In this paper, an effective nonlinear phase compensation method is proposed to compensate for the signal distortion caused by the radar waveform nonlinearities. It comprises two processing steps, namely, coarse phase compensation and precise phase compensation, which are based on the time-frequency (TF) distribution and the phase gradient autofocus (PGA) algorithm, respectively. The proposed method is a nonparametric method and can eliminate the errors caused by phase discontinuity of the dechirped frequency modulated continuous wave (FMCW) signal. Furthermore, the compensation method can be used in the processing of multi-period real data which are obtained from the FMCW THz radar.