ACTIVE SONAR WAVEFORM DESIGN MATCHED TO A SPHERICAL TARGET AND AN UNDERSEA CHANNEL
McCorkle, Justin C.
Ziomek, Lawrence J.
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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.
RightsThis 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.
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