Journal ArticleDOI
Use of generalised resolution methods to locate sources in random dispersive media
R. Klemm
- Vol. 127, Iss: 1, pp 34-40
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TLDR
In this paper, a shallow water sound propagation model is used to demonstrate the application of generalised power estimators to the problem of locating point acoustic sources in shallow water, where the desired signal wavefront is random.Abstract:
Random dispersive media such as the shallow-water sound channel cause the far field of a point source to be random in time and space. Consequently, resolution methods such as d.f.t., `maximum-likelihood estimator? or`maximum-entropy method? are useful only to a limited extent for estimation of source parameters such as range, bearing or depth. This is because those methods are based on the assumption that the signal wavefront is coherent. The resolution methods can easily be generalised to the situation in which the desired signal is random. A shallow water sound propagation model is used to demonstrate the application of generalised power estimators to the problem of locating point acoustic sources in shallow water.read more
Citations
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Journal ArticleDOI
Matrix fitting approach to direction of arrival estimation with imperfect spatial coherence of wavefronts
TL;DR: A novel solution to the performance of high-resolution direction of arrival estimation methods significantly degrades in several practical situations where the wavefronts have imperfect spatial coherence.
Journal ArticleDOI
Detecting pipe changes via acoustic matched field processing
TL;DR: This demonstration uses matched field processing for two receivers to infer whether or not there have been changes such as new intrusions relative to undisturbed fields measured earlier.
Proceedings Article
Tracking of convoys by airborne STAP radar
R. Klemm,M. Mertens +1 more
TL;DR: A coherent radar with multi-channel array antenna is considered which makes clutter suppression by space-time adaptive processing (STAP) techniques possible and a technique to estimate the lateral length component of a convoy is used in addition to the conventional range measurement.
Journal ArticleDOI
Interrelations between matched-field processing and airborne MTI radar
TL;DR: In this paper, a matched field processing (MFP) processor for space-time power estimation is proposed, where the spatial characteristics of a dispersive wave field are exploited to estimate certain parameters of the acoustic field.
Journal ArticleDOI
Low-Error Bearing Estimation in Shallow Water
TL;DR: In this paper, the authors used a pilot source which transmits training signals in order to achieve an estimate for a suboptimum spatial signal covariance matrix which is used for field matching.
References
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SNAP: The SACLANTCEN Normal-Mode Acoustic Propagation Model
TL;DR: A sound-propagation model based on normal mode theory is described, designed to give a realistic treatment of the ocean environment, including arbitrary sound-speed profiles in both water column and bottom, compressional and shear wave attenuation, scattering at rough boundaries, and range dependence.
Detection Performance of Horizontal Linear Hydrophone Arrays in Shallow Water.
TL;DR: In this paper, a comprehensive model study of the use of horizontal hydrophone arrays in shallow water is presented, where existing knowledge of signal processing techniques is applied to a shallow-water sound-propagation model in order to determine the influence of shallowwater conditions on the design of receiver structures.