Systematic Phase Correction for Direction-of-Arrival Estimation in Spectrally Interleaved OFDM MIMO Radar

This paper presents a phase correction method to improve direction-of-arrival (DOA) estimation in spectrally interleaved orthogonal frequency-division multiplexing (OFDM) multiple-input-multiple-output (MIMO) radar systems. It is new in the way that a phase correction step is introduced between the range-Doppler processing and the DOA estimation. The phase correction results in an improved dynamic range. Both processing steps, range-velocity and DOA, are performed using discrete Fourier transforms (DFTs). This paper starts by introducing the waveform and reviewing range-velocity processing in OFDM radars. After that, the new phase correction method is introduced. Then, the concept is implemented in a quantitative simulation. The last part includes the system description and measurement in an outdoor scenario. Finally, the simulation and measurement results are discussed.