Accession Number:

AD1065434

Title:

Active Sonar Waveform Design Matched to a Spherical Target and an Undersea Channel

Descriptive Note:

Technical Report

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA MONTEREY United States

Personal Author(s):

Report Date:

2018-09-01

Pagination or Media Count:

59.0

Abstract:

Traditionally, active sonar systems employ an enveloped-continuous wave CW or linear-frequency modulated LFM acoustic pulse that is transmitted into a lossy channel to interact with the target and environment where the received energy is used to determine if target detection occurs. Many frequency components of a wideband pulse are strongly attenuated due to the effects of the channel and target. In this work, a full-wave solution is used to model a complex channel frequency response. A realistic resonant sphere is used to develop the target response. To exploit the channel-target frequency response, two waveform design techniques are used signal-to-noise ratio SNR-based and information-based methods. Both techniques concentrate the transmit energy in the frequency bands where the target echo is large. The advantage of the Eigen waveform SNR-based and the mutual-information information-based waveform over the wideband acoustic waveform is the increase in detection probability.

Subject Categories:

  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE