Large Time-Bandwidth Product MIMO Radar Waveform Design Based on Chirp Rate Diversity

Multiple-input multiple-output (MIMO) radar waveform diversity design has received much attention, but most of the existing waveforms lack a large time-bandwidth product and are difficult to be implemented by real-life hardwares. In this paper, we propose a large time-bandwidth product waveform diversity design scheme based on chirp rate diversity for MIMO radar. The proposed scheme can generate a large number of pseudo-orthogonal waveforms that have large time-bandwidth product, constant modulus, no range-Doppler coupling target response, good orthogonality, and Doppler tolerance. In addition, the waveforms are orthogonal on both transmit and receive. The waveform performance is in-depth analyzed with the correlation and ambiguity functions. Furthermore, the corresponding frequency demodulation in the receiver is also discussed. Numerical results validate the superiorities of the designed waveforms in MIMO radar applications.