Hybrid interferometry for high-resolution DOA measurement

The author introduces and examines a novel approach to long-baseline, phase-comparison, paired antenna interferometry. In this approach, high-resolution (or `fine´) direction-of-arrival (DOA) measurement is based, as usual, on direct measurement of the phase difference between the outputs of two widely spaced antennas, but the attendant long-baseline ambiguity is resolved by a different (`coarse´) method of DOA measurement. The result, hybrid interferometry, permits the design of DOA determination systems that combine desirable characteristics (such as high resolution and accuracy, simplicity, low cost, self-calibration, etc.) of different methods of extracting DOA data from the simultaneous outputs of antenna elements that are positioned in diverse arrangements for realizing complementary apertures