(A) Study on the Performance Improvement for Wideband High Resolution RADAR Systems

Abstract

This thesis proposes two methods in order to improve the performance in the high resolution radar system using wideband linear frequency modulated waveform. One is the method to estimate the nonlinear phase distortion caused by the limit of voltage controlled oscillator (VCO) for linear frequency modulation and the estimated result can be exploited to predistort the frequency modulation to compensate the nonlinearity. The other is the spectral analysis method to eliminate spurious peaks in the spectrum of the intermediate frequency(IF) signal, generated by the periodic discontinuity of the signal in the system based on interrupted continuous waveform. Simulation results show that we can improve the resolution of the range profiles degraded by the nonlinear phase distortion using a combination of the estimation method and the predistortion technique and eliminate the spurious effectively via the proposed spectral analysis scheme.