Wyniki wyszukiwania dla: SILENT%20SONAR

• Silent Sonar with matched filtration

  Publikacja

  • R. Salamon
  • J. Marszal
  • J. Schmidt
  • M. Rudnicki

  - HYDROACOUSTICS - Rok 2011

  Radars with continuous wave frequency (CW FM sonars) are used in radiolocation as 'silent sonars'. They determine the distance to target by measuring the difference between the frequency of the sounding signal and echo signal. The article presents the principle of operation and parameters of silent CW FM sonars. Target distance determined by these sonars is based on the signal at the output of the matched filter. The Doppler effect...

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• Experimental Study of Silent Sonar

  Publikacja

  • J. Marszal

  - Archives of Acoustics - Rok 2014

  Stealth is a frequent requirement in military applications and involves the use of devices whose signals are difficult to intercept or identify by the enemy. The silent sonar concept was studied and developed at the Department of Marine Electronic Systems of the Gdansk University of Technology. The work included a detailed theoretical analysis, computer simulations and some experimental research. The results of the theoretical...

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• Estimating Intercept Range of Silent Sonar

  Publikacja

  • R. Salamon
  • J. Marszal

  - Rok 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...

• Application of Maximum Lenght Sequence in Silent Sonar

  Publikacja

  • J. Marszal
  • R. Salamon
  • L. Kilian

  - HYDROACOUSTICS - Rok 2012

  Silent sonars are designed to reduce the distance over which their sounding pulses can be detected by intercept sonars. In order to meet this objective, we can use periodical sounding signals that have low power, a very long duration and wide spectrum. If used in the silent sonar's receiver, matched filtration ensures very good detection of motionless or slow moving targets. However, it is more difficult to detect echo signals...

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• Distance measurement errors in silent FM-CW sonar with matched filtering

  Publikacja

  • J. Marszal
  • R. Salamon

  - Metrology and Measurement Systems - Rok 2012

  The secretiveness of sonar operation can be achieved by using continuous frequency-modulated sounding signalswith reduced power and significantly prolonged repeat time. The application of matched filtration in the sonarreceiver provides optimal conditions for detection against the background of white noise and reverberation, and avery good resolution of distance measurements of motionless targets. The article shows that target...

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• The project IDENT: Multimodal biometric system for bank client identity verification

  Publikacja

  • A. Czyżewski
  • P. Bratoszewski
  • P. Hoffmann
  • M. Lech
  • M. Szczodrak

  - Rok 2017

  Biometric identity verification methods are implemented inside a real banking environment comprising: dynamic handwritten signature verification, face recognition, bank cli-ent voice recognition and hand vein distribution verification. A secure communication system based on an intra-bank client-server architecture was designed for this purpose. Hitherto achieved progress within the project is reported in this paper with a focus...

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• AGGRESSION AND VIOLENT BEHAVIOR

  Czasopisma

  ISSN: 1359-1789 , eISSN: 1873-6335

• Talent Development and Excellence

  Czasopisma

  ISSN: 1869-0459

• Sileno: rivista di studi classici e cristiani

  Czasopisma

  ISSN: 1128-2118

• Headspace Solvent Microextraction

  Publikacja

  • A. Theis
  • A. Waldack
  • S. Hansen
  • M. Jeannot
  • M. Kaykhaii

  - ANALYTICAL CHEMISTRY - Rok 2001

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