In this paper, we propose a novel waveform design approach for coherent multiple-input multiple-output (MIMO) radar to make radar radiation management and transmit-receive beam refocusing at the radar receiver feasible. The transmitted waveforms are coded in the space domain to form a defocused transmit beam pattern for radiation management, and further in time domain to be orthogonal so that they can be separated and extracted through matched filtering at the radar receiver for transmit-receive beam refocusing processing. The proposed waveform design and beamforming approaches are validated through simulations.
