Abstract
The chirp sonar was developed to support the objective of remote acoustic classification of seafloor sediments. It is a calibrated wideband digital FM sonar that provides quantitative, high resolution, low noise sub-bottom data. In addition to producing high resolution images, the calibrated digitally recorded data is processed to estimate surficial sediment reflection coefficients and the acoustic impulse response of the seabed. An acoustic pulse with special frequency domain weighting characteristics is designed to provide nearly constant resolution with depth even after passing through a highly attenuating material such as sand. After correlation processing, the wideband acoustic pulse yields an effective beam pattern with a high spatial resolution that is almost free of sidelobes. The design and analysis of the chirp sonar waveform to provide a given spatial and temporal resolution is developed and results are simulated using models of the system and attenuation of sound in marine sediments. Good agreement between the simulations and data from the chirp profiler is obtained.
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