Browsing by Author "Søstrand, Knut A."

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Localization of a merchant ship by means of striations in a lofargram

Søstrand, Knut A. (2005)

In low frequency passive sonar a lofargram is a common presentation form for time varying spectral data. A target may emit narrow frequency lines and broadband noise. Depending upon the transmission channel, the target ...
Range localication of 10-100 km shots by means of an endfire array and a waveguide invariant

Søstrand, Knut A. (2002)

During a shallow-water acoustic experiment, signals from small explosions were recorded on an endfire horizontal array. The experiment took place in open waters with relatively slow changes of the water depth with range. ...
Summary report on analysis of acoustic data from the SWASI-99 array experiment

Eidem, Ellen Johanne; Jenserud, Trond; Søstrand, Knut A.; Tollefsen, Dag (2003)

The localization of underwater acoustic sources in a shallow water environment is addressed. Two array signal processing methods suitable for low-frequency signals in shallow water have been applied to data from an ...