  We propose a novel three-stage delay-Doppler-angle estimation algorithm for a
MIMO-OFDM radar in the presence of inter-carrier interference (ICI). First,
leveraging the observation that spatial covariance matrix is independent of
target delays and Dopplers, we perform angle estimation via the MUSIC
algorithm. For each estimated angle, we next formulate the radar delay-Doppler
estimation as a joint carrier frequency offset (CFO) and channel estimation
problem via an APES (amplitude and phase estimation) spatial filtering approach
by transforming the delay-Doppler parameterized radar channel into an
unstructured form. In the final stage, delay and Doppler of each target can be
recovered from target-specific channel estimates over time and frequency.
Simulation results illustrate the superior performance of the proposed
algorithm in high-mobility scenarios.
