Accession Number:

ADA191897

Title:

Simulation of Matched Field Processing Convergence Zones in a Strong Bottom Field.

Descriptive Note:

Professional paper for May 87,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

• Gordon, David F.

Report Date:

1987-11-01

Pagination or Media Count:

15.0

Abstract:

Below 30 Hz the convergence zone energy can be smaller than the bottom reflected energy. Matched field simulations using a normal mode program give narrow, irregular correlation peaks for target vectors taken from the complete field. Target vectors computed using only modes representing convergence zone energy are then processed against the complete acoustic field. A much broader, smoother correlation function is obtained. Target vectors are then constructed that are equivalent to delay and sum beamforming at specified angles. These vectors give correlation functions that resembled those for convergence zone energy, and illustrate the relationship between matched field processing and beamforming. Keywords Sum beamforming Target vectors Convergence zone energy.

Descriptors:

• *CONVERGENCE ZONES
• *BEAM FORMING
• *UNDERWATER ACOUSTICS
• ACOUSTIC FIELDS
• CORRELATION
• ENERGY
• FUNCTIONS(MATHEMATICS)
• MATCHING
• PROCESSING
• REFLECTION
• SAND
• SIMULATION
• TARGETING

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE