A study on separation of two close DOAs by using wide-band signals

The method of separating two or more wideband signals that arrive from close angles is proposed. Its high-resolution capability of direction of arrival estimation is based on extracting narrowband components from the wideband signals in the frequency domain. Then, the resolution is stepwise improved by changing the target frequency band upward. By this process, we can avoid the effect of grating lobes. It was shown to be able to separate the signals that arrive from close angles by repeating the above routine even though the electric power spectrum density is low.