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Hartstra, I.E. (author), Colin, M. (author), Prior, M.K. (author)Accurate sonar performance modelling is essential to predict likely detection ranges that can be obtained by employing active anti-submarine warfare sonars. Reverberation forms an important source of interference for active sonar performance, the effects of which can be diminished by using Doppler-sensitive pulses. Therefore, it is of importance...article 2021
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Prior, M.K. (author), Ainslie, M.A. (author), Halvoresen, M. (author), Hartstra, I.E. (author), Laws, R. (author), MacGillvray, A. (author), Müller, R.A.J. (author), Wang, L. (author), Robinson, S. (author), van Heijningen, A.W.P. (author)Measurements of sound emitted from airguns and airgun clusters are described. Measurements were made in 2007 and 2009-2010 in fjord environments in Norway and for various airgun types, chamber pressures, operating depths and airgun volumes. For each combination of these parameters, a sequence of up to 50 shots was performed, resulting in a few...report 2021
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Hartstra, I.E. (author), Salomons, E.M. (author), Colin, M.E.G.D. (author), Prior, M.K. (author)Passive-sonar-performance modelling requires the accurate estimation of the acoustic field for a broad range of frequencies in various environments. In this paper, we assess the suitability of a Gaussian Beam (Bellhop) and Parabolic Equation model (RAM), whereby we focus primarily on computational efficiency. For Parabolic Equation (PE) models...conference paper 2019
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Almagro Vidal, C. (author), van der Neut, J. (author), Verdel, A.R. (author), Hartstra, I.E. (author), Wapenaar, K. (author)Passive seismic interferometry enables the estimation of the reflection response of the subsurface using passive receiver recordings at the surface from sources located deep in the Earth. Interferometric imaging makes use of this retrieved reflection response in order to study the subsurface. Successful interferometric imaging relies on the...article 2018