Sub-Nyquist MIMO Radar Prototype with Doppler Processing

We present a hardware prototype of the sub-Nyquist multiple input multiple output radar (SUMMeR) system with capabilities of cognitive transmission and Doppler processing. The prototype allows both spatial and spectral compressive sampling. It realizes an X-band MIMO radar receiver configured to have a maximum of 8 transmit and 10 receive antenna elements. The orthogonality of MIMO waveforms is achieved via frequency division multiplexing. Targets range, azimuth and Doppler are recovered using the Xampling framework. The thinned 4x5 random array configuration achieves the detection performance of its filled array counterpart with samples obtained at 12.5% of Nyquist from half the antennas.