  The problem of 3D high-resolution imaging in automotive multiple-input
multiple-output (MIMO) side-looking radar using a 1D array is considered. The
concept of motion-enhanced snapshots is introduced for generating larger
apertures in the azimuth dimension. For the first time, 3D imaging capabilities
can be achieved with high angular resolution using a 1D MIMO antenna array,
which can alleviate the requirement for large radar systems in autonomous
vehicles. The robustness to variations in the vehicle's movement trajectory is
also considered and addressed with relevant compensations in the steering
vector. The available degrees of freedom as well as the Signal to Noise Ratio
(SNR) are shown to increase with the proposed method compared to conventional
imaging approaches. The performance of the algorithm has been studied in
simulations, and validated with experimental data collected in a realistic
driving scenario.
