Wyniki wyszukiwania

1

Digital signal processing applied to the modernization of Polish Navy sonars

100%

Marszal J.

Polish Maritime Research

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2014

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tom 21

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nr 2

The article presents the equipment and digital signal processing methods used for modernizing the Polish Navy’s sonars. With the rapid advancement of electronic technologies and digital signal processing methods, electronic systems, including sonars, become obsolete very quickly. In the late 1990s a team of researchers of the Department of Marine Electronics Systems, Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, began work on modernizing existing sonar systems for the Polish Navy. As part of the effort, a methodology of sonar modernization was implemented involving a complete replacement of existing electronic components with newly designed ones by using bespoke systems and methods of digital signal processing. Large and expensive systems of ultrasound transducers and their dipping and stabilisation systems underwent necessary repairs but were otherwise left unchanged. As a result, between 2001 and 2014 the Gdansk University of Technology helped to modernize 30 sonars of different types

2

Zastosowanie kultur in vitro w ochronie rzadkich i ginacych gatunkow paproci serpentynitowych

63%

Marszal J., Kromer K.

Biuletyn Ogrodów Botanicznych, Muzeów i Zbiorów

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2000

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tom 09

141-146

3

Zastosowanie kultur in vitro w ochronie rzadkich i ginacych gatunkow paproci serpentynitowych z Dolnego Slaska

63%

Marszal J., Kromer K.

Biotechnologia

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2004

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nr 2

237-243

4

Underwater navigation system based on doppler shift - measurements and error estimations

51%

Ostrowski Z., Salamon R., Kochanska I., Marszal J.

Polish Maritime Research

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2020

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tom 27

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nr 1

A new acoustic navigation system was developed to determine the position and speed of moving underwater objects such as divers and underwater vehicles. The path of an object and its speed were determined by the Doppler shifts of acoustic signals emitted by a transmitter placed on the object and received by four hydrophones installed at the periphery of the monitored body of water. The position and speed measurements were affected by errors mainly caused by acoustic reflections (returns) from the water body boundaries and surface reverberations. This paper discusses the source of the disturbances with the results of a simulation test and experimental measurements. It was demonstrated that the magnitude of the errors could be acceptable in most of the potential applications of the acoustic navigation system

5

Ochrona paproci serpentynowych z masywu Slezy i mozliwosci ich rozmnazania in vitro

51%

Marszal J., Kromer K., Nowak T. J.

Prace Ogrodu Botanicznego Uniwersytetu Wrocławskiego

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1999

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tom 05

415-422

6

The analysis of the plant genome of the population of Betula nana in the Linie Reserve using RAPD-PCR method

51%

Burnicka O., Marszal J., Dabrowska G.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

Ograniczanie wyników

2 Polish Maritime Research

1 Biotechnologia

1 Biuletyn Ogrodów Botanicznych, Muzeów i Zbiorów

1 Polish Journal of Natural Sciences. Supplement

1 Prace Ogrodu Botanicznego Uniwersytetu Wrocławskiego

6 Marszal J.

3 Kromer K.

1 Burnicka O.

1 Dabrowska G.

1 Kochanska I.

1 Nowak T. J.

1 Ostrowski Z.

1 Salamon R.

1 2020

1 2014

1 2004

1 2003