Low-Frequency Airborne Sonar Systems.
Abstract
The LOMASS project is a high-performance low-frequency sonar system to be carried by a helicopter. Such an ASW combination offers great potential for obtaining high area coverage. The program is divided into three phases. LOMASS I is a simplified echo-ranging system which serves as a basis for the other two phases. LOMASS II uses the basic LOMASS I system with the addition of a high- power driver and transducer. LOMASS III is a new system which uses an acoustic Luneberg lens to obtain preformed beams for scanning operation rather than the searchlight operation used in the first two phases. Each phase uses new and improved signal-processing techniques. Tests were performed to determine the spectral level and radiation pattern of noise radiated into the water by a Sikorsky HR2S helicopter. These tests, though incomplete, do indicate a high noise operating background which places a severe restriction on expected sonar range. More tests need to be performed to gain a better picture of the radiated, helicopter noise.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1958
- Accession Number
- AD0303629
Entities
People
- C .l. Maskaleris
- J. J. Yagelowich
Organizations
- United States Naval Research Laboratory