APR 81 P B RUSSELL, 4 M LISTON, S A DELATEUR DAA629-7B-C-OOO9 F4CLASSIFIEDA-1801-es N V STUDY OF REMOTE WIND MEASUREMENT USING ACOUSTIC ANGLE-OF-ARRIVAL0TECHNIQUES.-"Final x~eport, Approved for public release; distribution unlimited. NA SUPPLEMENTARY NOTESThe view, opinions, and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy, or decision, unless so designated by other documentation. KEY WORDS (Continue on reverse side if necessary and identify by block number)20 ABSTRACT (Continue on reverse side if necessary and identify by block number)-An angle-of-arrival sodar system was designed, built, and tested with the goal of determining boundary-layer winds.The system measures the backscattered signal induced in two closely spaced microphones on a single parabolic receiver antenna; the angle of arrival is calculated from the relative signal amplitudes. This is the acoustic analog of the amplitude-monopulse radar technique. However, the acoustic system uses distributed (atmospheric) targets and a fixed (not steerable) antenna.Tests demonstrated that the system can receive atmospheric echoes and process the analog signals to estimate angle-of-arrival (hence, layer-averaged wind) when signal-to-noise ratios are adequate. However, the validity of these wind estimates was not demonstrated with correlative wind data. Digital processing techniques were. D D FORM