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Chirp Subbottom Profiler For Quantitative Sediment Analysis, Steven G. Schock, Lester R. Leblanc, Larry A. Mayer
Chirp Subbottom Profiler For Quantitative Sediment Analysis, Steven G. Schock, Lester R. Leblanc, Larry A. Mayer
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A wide‐band, frequency‐modulated, subbottom profiling system (the chirp sonar) can remotely determine the acoustic attenuation of ocean sediments and produce artifact‐free sediment profiles in real time. The chirp sonar is controlled by a minicomputer which performs analog‐to‐digital and digital‐to‐analog conversion, correlation processing, and attenuation estimation in real time. The minicomputer generates an FM pulse that is phase‐ and amplitude‐compensated to correct for the sonar system response. Such precise waveform control helps suppress correlation noise and source ringing. The chirp sonar, which has an effective bandwidth of 5 kHz, can generate chirp (Klauder) wavelets with a tuning thickness (Rayleigh’s criterion for …