Study of Remote Wind Measurement Using Acoustic Angle-of-Arrival Techniques.
Abstract
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 space 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. Test 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 implemented with the goals of automatic wind calculation, identification of adequate signal-to-noise ratios, and noise subtraction. Computer hardware limitations prevented achieving these goals. However, we believe that they could be achieved by using a computer with larger memory capacity. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1981
- Accession Number
- ADA100860
Entities
People
- Edward M. Liston
- Philip B. Russell
- Stephen A. Delateur
Organizations
- SRI International