A Linear Systems Theory Approach to the Range-Independent Acoustic Channel
Abstract
Using linear systems theory as a framework, the solution for the acoustic field present in a range-independent acoustic channel excited by a complex-weighted, planar array of point sources with an arbitrary input electrical signal is derived. The ocean medium is characterized by a transfer function, obtainable as the solution to the Helmholtz wave equation. The transfer function for an isospeed, three-layer waveguide is derived. The unbounded homogeneous medium equations are derived as a special case of the waveguide problem. The problem of interference due to the presence of a pressure-release surface is also derived as a special case. The linear systems approach lends itself to a modular computer implementation, in which different ocean medium models are represented by subroutines implementing their transfer functions. The equations for a range-independent medium are implemented as a group of subprograms. Results are presented for the special cases of a homogeneous medium and the surface reflection problem, which can be checked against known, easily interpreted analytical solutions. Finally, an example of waveform prediction for the isospeed, three-layer waveguide is presented. Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1989
- Accession Number
- ADA216551
Entities
People
- Luiz A. Lopes De Souza
Organizations
- Naval Postgraduate School