Tracking herring schools with a high resolution sonar. Variations in horizontal area and relative echo intensity
نویسندگان
چکیده
منابع مشابه
A resolution comparison of horizontal and vertical magnetic transfer functions
The main goal of the present study is to identify characteristics of the inter-station horizontal magnetic responses and the vertical magnetic data, as two types of magnetotelluric transfer functions, in the modeling procedure. Through consideration of model responses and two-dimensional inversion of synthetic data, sensitivity of the data components in detecting different geophysical structure...
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Behavior of killer whales feeding on herring schools was recorded with a high frequency (455 kHz) sonar and recorded on a SVHS tape. Synchronization of surfacing behavior of killer whales was analyzed from 8 mm videotapes recorded between 1990–92. Two different feeding techniques, carousel feeding, where killer whales cooperatively herd herring schools into a tight ball towards the surface and ...
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In this paper we have presented a new procedure for sonar image target tracking using PHD filter besides K-means algorithm in high density clutter environment. We have presented K-means as data clustering technique in this paper to estimate the location of targets. Sonar images target tracking is a very good sample of high clutter environment. As can be seen, PHD filter because of its special f...
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The difference-frequency band of the Kongsberg TOPAS PS18 parametric sub-bottom profiling sonar, nominally 1-6 kHz, is being used to observe Atlantic herring. Representative TOPAS echograms of herring layers and schools observed in situ in December 2008 and November 2009 are presented. These agree well with echograms of volume backscattering strength derived simultaneously with the narrowband S...
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Recent developments in the use of composite ceramics for high frequency arrays have reached the stage where large area, high frequency sonar receiver arrays can be produced cost effectively [1]. Typically these consist of hundreds of individual sensors with excellent element-to-element matching, in both gain and phase, over bandwidths in excess of an octave centred on frequencies in the range 3...
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ژورنال
عنوان ژورنال: ICES Journal of Marine Science
سال: 1998
ISSN: 1054-3139
DOI: 10.1006/jmsc.1997.0228