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.