Active Sonar Waveform Design Matched to a Spherical Target and an Undersea Channel
NAVAL POSTGRADUATE SCHOOL MONTEREY CA MONTEREY United States
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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 Eigen waveform SNR-based and the mutual-information information-based waveform over the wideband acoustic waveform is the increase in detection probability.
- Acoustic Detection and Detectors