Root-Music Harmonic Analysis Joint Multiple Regression: DOA Estimation Applied to Millimeter Wave FMCW Radar

For millimeter wave (MMW)-FMCW radar estimates the direction-of-arrival (DOA) of targets, we present the root-MUSIC harmonic retrieval joint Multiple Regression (RMHRMR) algorithm. First, the target's IF signal is resolved and reconstructed by the root-MUSIC harmonic retrieval method. Then, by considering both the real data and imaginary data, we regard the signal expression of each array sensor as an independent form of multiple regression and further achieve the DOA by iteratively estimating the regression coefficient of the reconstructed target's IF signal from each array sensor one at a time. The simulation demonstrates the superiority of the proposed RMHRMR algorithm. Finally, the effectiveness of the RMHRHR algorithm in actual situation is verified.