Search results for: INTEREPR SONARS

• Estimating Intercept Range of Silent Sonar

  Publication

  • R. Salamon
  • J. Marszal

  - Year 2013

  When used in military application, sonars should ensure secretiveness. There is some evidence suggesting that silent sonars have a significant advantage over pulse sonars in the respect. If improved, the secretiveness of silent sonar translates into the distance over witch its soundings signal are detected by intercept sonars. The article gives estimated distances for far, medium, and short range sonars operating in the oceans...

• Detection Range of Intercept Sonar for CWFM Signals

  Publication

  • J. Marszal
  • R. Salamon

  - Archives of Acoustics - Year 2014

  Stealth in military sonars applications may be ensured through the use of low power signals making them difficult to intercept by the enemy. In recent years, silent sonar design has been investigated by the Department of Marine Electronic Systems of the Gdansk University of Technology. This article provides an analysis of how an intercept sonar operated by the enemy can detect silent sonar signals. To that end a theoretical intercept...

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• Comparative Study of Integer and Non-Integer Order Models of Synchronous Generator

  Publication

  • S. Racewicz
  • F. Kutt
  • M. Michna
  • Ł. Sienkiewicz

  - ENERGIES - Year 2020

  This article presents a comparison between integer and non-integer order modelling of a synchronous generator, in the frequency domain as well as in the time domain. The classical integer order model was compared to one containing half -order systems. The half-order systems are represented in a Park d-q axis equivalent circuit as impedances modelled by half-order transmittances. Using a direct method based on the approximation...

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• PUBLIC INTEREST

  Journals

  ISSN: 0033-3557

• National Interest

  Journals

  ISSN: 0884-9382

• Imaging forms in passive sonars

  Publication

  • A. Raganowicz
  • L. Kilian

  - Year 2005

  Referat jest kontynuacją tematyki organizacji zobrazowań we współczesnych systemach hydrolokacyjnych przedstawionej w referacie zaproszonym na ubiegłorocznym OSA dla systemów aktywnych. Tym razem dotyczy organizacji zobrazowań w systemach pasywnych. W praktyce, prócz prostych systemów nasłuchu i rejestracji dźwięków podwodnych, używanych przez badaczy fauny wodnej czy oceanografów, systemy pasywne są wykorzystywane w marynarkach...

• Mutual Clutter Suppression Techniques for FM Sonars

  Publication

  • J. Marszal
  • M. Rudnicki
  • A. Jedel
  • R. Salamon
  • I. Kochańska

  - Archives of Acoustics - Year 2016

  The article presents methods that help in the elimination of mutual clutter as well as the consequences of two FM sounding signal sonars operating in the same body of water and frequency band. An in-depth analysis of mutual clutter was carried out. The effects of sounding signal differentiation were determined, as was the Doppler effect on mutual clutter suppression. One of the methods analysed is of particular interest in a situation...

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• Implementation of Contemporary Technologies in Naval Sonars Modernization

  Publication

  • J. Marszal

  - HYDROACOUSTICS - Year 2013

  Today’s fast technological advancement in electronics and signal processing methods makes electronic systems, including sonars, obsolete very quickly. The Polish Navy seems to be particularly affected as its ships were built in the 1970s and 1980s. Researchers at the Gdansk University of Technology have developed a methodology for modernising Navy sonars which involves the use of new electronic sub-systems and modern, bespoke methods...

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• Identification of regions of interest in video for a traffic monitoring system

  Publication

  • G. Szwoch
  • P. Dalka

  - Year 2008

  A system for automatic event detection in the camera image is presented in this paper. A method of limiting a region of interest to relevant parts of the image using a set of processing procedures is proposed. Image processing includes object detection with shadow removal performed in the modified YCbCr color space instead of RGB. The proposed procedures help to reduce the complexity of image processing algorithm and result in...

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• Identification of regions of interest in video for a traffic monitoring system

  Publication

  • G. Szwoch
  • P. Dalka

  - Year 2008

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