Frequency Modulation Parasitic DOA Error Compensation

This paper introduces a phase normalize transform (PNT) method to compensate for parasitic direction-of-arrival (DOA) error due to frequency modulation for wideband DOA estimation. Because the existing wideband DOA methods are based on a covariance alignment scheme, there is a limit to the location or order of DOA processing in the radar signal processing (RSP) framework. Because the proposed method compensates for parasitic components caused by the wideband signal, it is advantageous to apply it to various RSP frameworks without any modification. The performances of the popular wideband DOA method and narrowband MUSIC method are compared with that of the proposed method through computer simulations. The simulations demonstrate the higher performance of the proposed method in the mid-to-high SNR range compared with that of previous methods. In addition, real data obtained from a developed 79 GHz radar system are presented to show the effectiveness of the proposed method.