A study on direction‐of‐arrival estimation methods using cosθ amplitude response antenna

摘要: At present, when the direction of arrival a low-frequency electromagnetic wave such as one in HF band is measured, loop antennas are used. However, measurement used underwater communications, subsurface resource detection, volcanic activity observation, and natural receiving power sensitivity decreases frequency decreased. The purpose this paper to use SQUID (Superconducting QUantum Interference Device), known an ultrasensitive magnetic sensor, for construction small antenna estimating waves. As first step, configuration estimation method shown below proposed. As broadband with amplitude response type, we consider array, which has cosθ mode vector consisting elements on circle radius, negligible comparison wavelength incident wave. For real-valued vector, direction-of-arrival within framework principle ESPRIT MUSIC, high-resolution methods, derive method. obtained be ultimately reducible simple equation deriving phase difference between −1st 1st fundamental waves after beam subspace transformation correlation function without eigenfunction expansion. By computer simulation, it that accuracy 0.2 2° by finitely many snapshots actually anticipated. © 2002 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 85(10): 8–22, 2002; Published online InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.10009