Investigation of a Parametric Acoustic Receiving Array for Mobile Applications.
Abstract
The parametric acoustic receiving array (PARRAY) exploits the nonlinearity of acoustic waves in water to achieve directional reception of low frequency acoustic waves using only two high frequency transducers and associated electronics. In mobile applications the parametric receiver will be required to operate under the influence of sensor motion, and in water that is sometimes turbulent. This report describes these two areas of technical risk which are pertinent to the successful implementation of PARRAYs on submarine platforms. Analysis, fabrication, and testing of a phase-locked loop receiver is described. This type of receiver is shown to be well suited for demodulating the output of a mobile PARRAY hydrophone and reducing the detrimental effects of transducer motion on the PARRAY. For mobile applications the transducers will be moving with respect to the water and will create some degree of turbulence near the sensors. Investigations of the effects of turbulence on the operation of the PARRAY are discussed. These investigations allow predictions of the magnitude of amplitude and phase fluctuations generated at the PARRAY hydrophone output for known levels of turbulence. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 05, 1980
- Accession Number
- ADA096563
Entities
People
- C. Robert Clubertson
- David F. Rohde
- Robert A. Lamb
Organizations
- University of Texas at Austin