A new method of velocity measurement based on crt algorithm in dual-frequency pulse Doppler radar

For coherent pulse Doppler(PD) radar system, ambiguity may occur in velocity measurement especially when the pulse repetition frequency (PRF) is low or the target´s radial velocity is enough high. Regarding the characters of this class of problems, in this paper, a new method of velocity measurement based on modified Chinese Remainder Theorem (CRT) algorithm in dual-frequency PD radar is proposed. Precise velocity measurement value would be achieved through processing dual-frequency pulse echo signals. Furthermore, Using the modified CRT algorithm, a wide range velocity measurement value would be obtained by synthesizing two estimated target velocities that are folded in dual-frequency. After the integration of the two data, the dual-frequency PD radar system base on a modified CRT algorithm has the capability of wide range and high precise velocity measurement. Theoretical velocity measurement accuracy and measurement range are analyzed in the AWGN channel. Specific conclusions are verified with some simulation results.