Wyniki wyszukiwania - BazTech

1

Theoretical analysis of a new approach to order determination for a modified Prony method in swath mapping application

Grall P., Marszal J.

Hydroacoustics

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2017

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Vol. 20

63--74

EN

This article presents a new approach to determine the model order (number of principal components) in the modified Prony method applied to swath acoustic mapping. Determination of the number of principal components is a crucial step in the modified Prony method. In the proposed approach the model order is chosen based on the underlying physical model of the underwater acoustic environment, and utilised signal processing operations. This data-driven approach, attempts to make use of all available information to assess the number of signals arriving at the receiver using pipeline processing in lieu of iterative processing.

2

The accuracy of a new approach to order determination for the Modified Prony method in swath mapping application

Grall P.

Hydroacoustics

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2017

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Vol. 20

51--62

EN

This article presents the performance of a new approach to determine the model order for the modified Prony method applied to swath acoustic mapping. Key requirements for any mapping application are depth determination accuracy and angular resolution. Depth determination accuracy is strictly related to angular accuracy and geometrical relations between receiver and sources of the backscattered signal. Angular resolution determines detection capabilities of targets laying on the seafloor. Performance of the proposed method, in terms of these two parameters, is tested against a simulated signal in a number of generic configurations, and compared to the results of other methods applied to the same signal.

3

Ocena porównawcza standardów SPS systemu GPS w aspekcie dokładności określenia pozycji

Grall P., Specht C.

Zeszyty Naukowe Akademii Marynarki Wojennej

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2011

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R. 52 nr 3 (186)

43-56

PL

W artykule dokonano oceny porównawczej standardów opisujących charakterystyki pracy standardowego serwisu pozycyjnego systemu GPS (Standard Positioning Service — SPS) gwarantowane przez właściciela systemu. W pierwszej części przedstawiono miary służące do określenia dokładności SPS stosowane w kolejnych wersjach standardu. W drugiej części zaprezentowano wartości poszczególnych miar dokładności stosowanie w standardzie SPS oraz ich zestawienie porównawcze. Artykuł kończą ogólne wnioski dotyczące dokładności SPS.

EN

The article is focused on different approaches to the GPS Standard Positioning Service (SPS) accuracy guaranteed by the U.S.A. government. The article presents changing accuracy metrics used in subsequent editions of GPS SPS specifications. The article ends up with a comparison of accuracy standards and general conclusions on GPS SPS accuracy.