Waveform optimisation for unambiguous Doppler extension

Coherent train of pulses can obtain high Doppler resolution, but leads to range and Doppler ambiguity. Thus, the staggered pulse repetition frequencies are presented to extend the unambiguous range or Doppler coverage. However, there are various disadvantages either in pulse-to-pulse stagger or block-to-block stagger. In this study, inspired by the Doppler compensation processing, a modified range Doppler (RD) processing method is proposed. Correspondingly, a waveform design scheme matching this method is also presented. The modified RD processing associated with the designed waveform can effectively solve the Doppler ambiguity problem. Simulation results verify the effectiveness of the modified RD processing method and the designed waveform.