Extended symmetrical aperture direction finding using correlative interferometer method

Correlative Interferometry is the most commonly used practical Direction Finding method. It is based on comparing the measured phase differences with the recorded and saved phase differences. In order to achieve an unambiguous direction of arrival (DOA) estimate, classical methods require antenna aperture within half wavelength. In this paper, we compare the effect of the increased number of non-parallel antenna pairs. It is observed that, increasing the number of non-parallel antenna pairs (baselines), unambiguous DOA estimates can be made for a symmetrically placed antenna array with antenna apertures greater than the half wavelength.