ACTIVE SONAR WAVEFORM DESIGN MATCHED TO A SPHERICAL TARGET AND AN UNDERSEA CHANNEL
Authors
McCorkle, Justin C.
Subjects
active sonar
eigenwaveform
mutual information
waveform design
waterfilling
spherical target
undersea channel
eigenwaveform
mutual information
waveform design
waterfilling
spherical target
undersea channel
Advisors
Romero, Ric
Date of Issue
2018-09
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
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 eigenwaveform (SNR-based) and the mutual-information (information-based) waveform over the wideband acoustic waveform is the increase in detection probability.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering (ECE)
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.