HYDROACOUSTICS - Czasopismo - MOST Wiedzy

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HYDROACOUSTICS

ISSN:

1642-1817

eISSN:

2450-128X

Wydawca:

Polska Akademia Nauk , Polskie Towarzystwo Akustyczne

Punkty Ministerialne: Pomoc

Punkty Ministerialne - aktualny rok
Rok Punkty Lista
Rok 2024 5 Czasopisma spoza wykazu ministerialnego 2024
Punkty Ministerialne - lata ubiegłe
Rok Punkty Lista
2024 5 Czasopisma spoza wykazu ministerialnego 2024
2023 5 Czasopisma spoza wykazu ministerialnego 2023
2022 5 Czasopisma spoza wykazu ministerialnego (2019-2022)
2021 5 Czasopisma spoza wykazu ministerialnego (2019-2022)
2020 5 Czasopisma spoza wykazu ministerialnego (2019-2022)
2019 5 Czasopisma spoza wykazu ministerialnego (2019-2022)
2018 7 B
2017 7 B
2016 6 B
2015 6 B
2014 7 B
2013 7 B
2012 4 B
2011 4 B
2010 6 B

Model czasopisma:

Open Access

Impact Factor:

brak danych

Polityka wydawnicza:

Licencja: CC BY-NC-SA 3.0
Licencja
Creative Commons: BY-NC-SA 3.0 otwiera się w nowej karcie
Informacja o polityce wydawniczej
brak danych
Informacja o warunkach samoarchiwizacji
Zawarta w licencji
Czy czasopismo pozwala na samoarchiwizację
Tak - z ograniczeniami
Submitted Version Pomoc
tak
Accepted Version Pomoc
tak
Published Version Pomoc
tak
Miejsca samoarchiwizacji
poza serwisami komercyjnymi
repozytorium publikacji naukowych
strona pracodawcy (zgodnie z afiliacją)
strona domowa autora
Informacje o polityce dot. danych badawczych
brak danych
Embargo w miesiącach
brak embargo
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Przy udostępnianiu / rozpowszechnianiu należy podać źródło oryginału.
Typ licencji podany przy artykule: CC BY-NC-SA 3.0.

Filtry

wszystkich: 144

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wyczyść Filtry wybranego katalogu niedostępne

Katalog Czasopism

Rok 2017
  • Theoretical analysis of a new approach to order determination for a modified Prony method in swath mapping application
    Publikacja

    - HYDROACOUSTICS - Rok 2017

    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....

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  • The accuracy of a new approach to order determination for the Modified Prony method in swath mapping application
    Publikacja
    • P. Grall

    - HYDROACOUSTICS - Rok 2017

    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...

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  • Sonar Pulse Detection Using Chirp Rate Estimation and CFAR Algorithms
    Publikacja

    This paper presents a new approach to sonar pulse detection. The method uses chirp rate estimators and algorithms for the adaptive threshold, commonly used in radiolocation. The proposed approach allows detection of pulses of unknown parameters, which may be used in passive hydrolocation or jamming detection in underwater communication. Such an analysis is possible thanks to a new kind of imaging, which presents signal energy in...

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  • On Algorithm Details in Multibeam Seafloor Classification
    Publikacja

    Remote sensing of the seafloor constitutes an important topic in exploration, management, protection and other investigations of the marine environment. In the paper, a combined approach to seafloor characterisation is presented. It relies on calculation of several descriptors related to seabed type using three different types of multibeam sonar data obtained during seafloor sensing, viz.: 1) the grey-level sonar images (echograms)...

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  • Multidimensional GIS for satellite imagery analysis

    Multidimensional Geographical Information System allows storing, querying and processing of multidimensional query data. It is able to process satellite imagery and provide tools for its analysis. In the article authors present the developed system that analyzes a time series of SENTINEL - 1 mission satellite imagery acquired over the coast of Poland. The algorithm used finds and detects changes in the shape...

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  • Multibeam data processing for 3D object shape reconstruction
    Publikacja

    The technology of hydroacoustic scanning offers an efficient and widely-used source of geospatial information regarding underwater environments, providing measurement data which usually have the structure of irregular groups of points known as point clouds. Since this data model has known disadvantages, a different form of representation based on representing surfaces with simple geometric structures, such as edges and facets,...

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  • MEMS Technology Evaluation for Submerged Vehicle Navigation
    Publikacja

    Analysis of some vital aspects of inertial navigation using MEMS. The paper presents a few aspects of MEMS gyro errors, and their estimation process in the context of INS processing flow. These errors have a serious impact on overall inertial system performance. The results of undertaken researches in that area, and pointing out the main difficulties behind the INS when using a few top MEMS technologies, including sophisticated...

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  • Measurement of Impulse Response of Shallow Water Communication Channel by Correlation Method

    Performances of underwater acoustic communication (UAC) systems are strongly related to specific propagation conditions of the underwater channel; conditions that can additionally change in time due to the movement of the acoustic system transmitter and receiver or to reflection by underwater objects of the transmitted signal. The time-varying impulse response is a comprehensive description of dynamically changing transmission...

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  • Integrated acoustical-optical system for inventory of hydrotechnical objects
    Publikacja

    - HYDROACOUSTICS - Rok 2017

    The knowledge of the location, shape and other characteristics of spatial objects in the coastal areas has a significant impact on the functioning of ports, shipyards, and other waterinfrastructure facilities, both offshore and inland. Therefore, measurements of the underwater part of the waterside zone are taken, which means the bottom of the water and other underwater objects (e.g. breakwaters, docks, etc.), and objects above...

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  • Inertial Sensors Applications in Underwater Measurements
    Publikacja

    Over the past decades microelectromechanical systems (MEMS) researchers have demonstrated a number of microsensors for almost every possible sensing modality, including attitudes. Current MEMS inertial measurement units (IMU) come in many shapes, sizes, and costs — depending on the application, and performance required. MEMS sensors have proved and demonstrated performance exceeding those of their macroscale counterpart sensors. In...

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  • Analysis of distance measurement errors in CW FM sonar with MLS code modulation
    Publikacja

    Although used in the classic silent sonar, the CW FM sounding signal has a major flaw which is its inaccuracy in determining the distance to a target. The authors of the article have developed a concept of silent sonar using frequency modulation signals switched by pseudorandom codes, already discussed in their previous work. This article presents a detailed analysis of errors in CW FM sonar with pseudo-random sequence code modulation...

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Rok 2016
Rok 2015
  • Usage of the Gstreamer framework for generation, analysis, processing and visualization of sonar signal
    Publikacja

    - HYDROACOUSTICS - Rok 2015

    In this paper a novel method of the bearing estimation in a passive sonar system with a towed array is introduced. The classical approach of the bearing estimation based on the spatial spectrum is extended by using the synchrosqeezing method that is a part of the reassignment method introduced by Kodera et al. The usage of this method leads to the precise bearing estimation. The proposed method requires a relatively small amount...

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  • Tracking of the broadband source of the underwater noise in the very shallow water conditions
    Publikacja

    The paper contains the result s, both theoretical and experimental , connected with the tracking of the underwater noise source as small ships, pontoon , diver and so on. The pro blem of security in the shallow water area is the challenge for underwater acousticians. In this paper there is take n into account the detection of the sources that move on the surface of the sea or underwater in shallow...

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  • THE SYNCHROSQUEEZING METHOD IN BEARING ESTIMATION OF STATIONARY SIGNALS FOR PASSIVE SONAR WITH TOWED ARRAY
    Publikacja

    In this paper, a novel method of bearing estimation in a passive sonar system with a towed array is introduced. The classical approach of bearing estimation based on the spatial spectrum [1] is extended by using the synchrosqeezing method that is a part of the reassignment method introduced by Kodera et al. [2]. Using this method leads to a precise bearing estimation. The proposed method requires a relatively small amount of computation,...

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  • Submerged objects modeling and storing in a global reference context using multiresolution spline technique,
    Publikacja

    Contemporary records from multibeam sonars or even elevations from 3D shuttle radar topography missions feature high resolution. On the other hand, bathymetric models of a different resolution from different sensors are available as well, beginning from very high resolution MBS records and low resolution records coming from regular scattered measurements. Approximating and eventually visualizing the high volume scattered 3D raster...

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  • Reconstruction Methods for 3D Underwater Objects Using Point Cloud Data
    Publikacja

    Existing methods for visualizing underwater objects in three dimensions are usually based on displaying the imaged objects either as unorganised point sets or in the form of edges connecting the points in a trivial way. To allow the researcher to recognise more details and characteristic features of an investigated object, the visualization quality may be improved by transforming the unordered point clouds into higher order structures....

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  • Receiver of Doppler multistatic system for moving target detection and tracking
    Publikacja

    The article presents a method for solving major structural problems that occur in the receiver used in the multistatic Doppler system, aimed at determination of the trajectory and velocity of a moving target. In the system two transmitters emit acoustic continuous sinusoidal waves at different frequencies. The signals, scattered from a moving target are received by four hydrophones. Beside of the echoes, much larger signals coming...

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  • INVESTIGATION INTO INTERFEROMETRIC SONAR SYSTEM ACCURACY
    Publikacja

    - HYDROACOUSTICS - Rok 2015

    The results of the accuracy measurements of phase differencing bathymetric sonar (PDBS) system in shallow waters are presented in the article. The measurement results were compared with the theoretical calculations for sonar system accuracy and international standards for hydrographic surveys. The proposed formulas enable to assess a priori sonar system performance using system quality factor (SQF), which takes into account influence...

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  • Coastal zone monitoring using Sentinel-1 SAR polarymetry data
    Publikacja

    In recent years the role of the surveillance and security of Polish boundaries has significantly increased. Polish coastal zone monitoring requires various approaches using various technological means in order to ensure the protection of Polish boundaries. In this paper, the authors discuss and present alternatives to underwater surveillance methods of coastal area analysis and monitoring using data retrieved from the newly developed...

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  • ADAPTIVE IDENTIFICATION OF TIME-VARYING IMPULSE RESPONSE OF UNDERWATER ACOUSTIC COMMUNICATION CHANNEL
    Publikacja

    The transmission properties of underwater acoustic communication channel can change dynamically due to the movement of acoustic system transmitter and receiver or underwater objects reflecting transmitted signal. The time-varying impulse response measurement and estimation are necessary to match the physical layer of data transmission to instantaneous channel propagation conditions. Using the correlative measurement method, impulse...

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Rok 2014
  • Ultrawideband transmission in physical channels: a broadband interference view

    The superposition of multipath components (MPC) of an emitted wave, formed by reflections from limiting surfaces and obstacles in the propagation area, strongly affects communication signals. In the case of modern wideband systems, the effect should be seen as a broadband counterpart of classical interference which is the cause of fading in narrowband systems. This paper shows that in wideband communications, the time- and frequency-domain...

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  • The hydrodynamic pressure field of the ship Zodiak, measurements and calculations
    Publikacja

    The article presents the results of measurements of the slowly changing hydrodynamic pressure field HPF generated by the movement of the ship, Zodiak, in the Bay of Gdansk. The measurement results have been obtained in the framework of the program of the work in Siramis, under the auspices of the European Defence Administration of the EU, by the research team of the Naval Academy in Gdynia. The measurement results were compared with...

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  • The Doppler effect in a bistatic system for determining the position of moving targets
    Publikacja

    The article presents the theoretical analysis and the results of numerical calculations of the Doppler effect it occurs in a system designed to determine the position and speed of a moving target. The transmitter is the source of the signal and it emits a sinusoidal, acoustic and continuous wave. Signal reflected off a moving target is received by four hydrophones. Based on the signals, four Doppler shifts are determined and inserted...

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  • Reliable underwater communication system for shallow coastal waters
    Publikacja

    - HYDROACOUSTICS - Rok 2014

    This paper presents a reliable and robust low data rate spread spectrum approach which is implemented in the acoustic underwater communication system for shallow coastal waters. It shows operation assumptions of spread spectrum techniques based on the wellknown Shannon equation. It describes two methods of spread spectrum: frequency hopping spread spectrum and direct sequence spread spectrum; their block diagram and their characteristics...

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  • RADIATION OF HIGH INTENSITY SOUND BY CIRCULAR DISC BY MEANS OF THE NUMERICAL METHOD
    Publikacja

    The main goal of this paper is to find sound pressure distribution radiated by the circular piezoelectric disc that vibrates with the finite amplitude. There has been presented the pressure distribution close to the radiating surface. Also it is shown the sound pressure distribution in the 3D form. The mathematic modeling was carried out on the base of the nonlinear acoustic equation with the proper boundary condition. The axial...

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  • INVESTIGATION OF BOTTOM SEDIMENT STRATIFICATION
    Publikacja

    The main goal of this paper is to find a method to assess remotely the type of sediments on the basis of the signal received using the parametric echosounder. The images of the sea bottom sediments taken by a parametric echosounder show the fine structure of the upper layer of the bottom sediments. The depth of penetration depends on the type of sediment, in fact on the attenuation of acoustic wave. In the paper the method of distinguishing...

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  • Chirp-rate estimation of FM signals in the time-frequency domain
    Publikacja

    Novel dynamic representations of a complex signal in the time-frequency domain including: a channelized instantaneous complex frequency (CICF), a complex local group delay (CLGD) and a channelized instantaneous chirp-rate (CICR) are introduced. The proposed approach is based on the use of the gradient of the short-time Fourier transform complex phase. An interpretation of the newly-introduced distributions especially of the CICR...

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  • 3D Imaging Of Underwater Objects Using Multi-Beam Data
    Publikacja

    One of the main applications of multibeam sonars is high resolution bathymetry measurement, as well as detecting and imaging of underwater objects like shipwrecks. In order to obtain the visualisation quality good enough to allow the researcher to investigate an object in more detail, the approach relying on construction of three-dimensional model of an imaged object, e.g. consisting of nodes, edges and plane elements (facets)...

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wyświetlono 1457 razy