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Prototype parametric sidescan sonar instrument

Parametric sonars for sub-bottom profiling is being used to achieve higher spatial resolution than conventional sub-bottom profilers. This technology has now been developed further into a parametric side scan sonar (PSSS) system where high frequency primary signals are used for getting a conventional side scan image of the seabed and the parametrically generated difference frequency (low frequency) is used for penetration into the sediments in the same area. Two receiver arrays are used in order to perform interferometric processing for depth information.

The system operated at primary frequencies around 100 kHz and secondary frequencies from 4kHz to 20kHz. The transmitted signature can be either a Ricker wavelet, Chirp (FM) wavelet or a CW signal. The received signals will be processed by software developed by other partners in the SITAR project. The major software package is a 3-D synthetic aperture sonar-processing package.

The main purpose of PSSS is to improve the efficiency and reliability in surveying and detection of buried or partly buried objects such as waste, sources of pollution, mines etc.

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Reported by

Kongsberg Defence & Aerospace AS, Sensor Systems
Strandveien 1, P.O. Box 55
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