On Doppler Ambiguity Estimation for Millimeter FM-CW Radar by Using MUSIC Algorithm

Even though Pulse-Doppler radar estimates velocity by measuring phase shift amount between pulses, the visible Doppler range is limited by Pulse-Repetition-Interval (PRI). In radio wave, Doppler frequency occurs from moving target as well as sound wave and the phase shift information should include slightly in samples of individual pulses. In this study, MUSIC algorithm is applied to measure these minute shift. We show experimental results on Doppler shift amount estimation by using both fast-time and slow-time and show that the shift amount can be measured without depending on PRI.