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Wyniki wyszukiwania dla: RECEIVED SIGNAL STRENGTH (RSS)

Wyniki wyszukiwania dla: RECEIVED SIGNAL STRENGTH (RSS)

  • Direction of Arrival Estimation Based on Received Signal Strength Using Two-Row Electronically Steerable Parasitic Array Radiator Antenna

    Publikacja

    - SENSORS - Rok 2022

    In this paper, we present a novel approach to direction-of-arrival (DoA) estimation using two-row electronically steerable parasitic array radiator (ESPAR) antenna which has 12 passive elements and allows for elevation and azimuth beam switching using a simple microcontroller, relying solely on received signal strength (RSS) values measured at the antenna output port. To this end, we thoroughly investigate all 18 available 3D antenna...

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  • RSS-Based DoA Estimation for ESPAR Antennas Using Support Vector Machine

    Publikacja

    - IEEE Antennas and Wireless Propagation Letters - Rok 2019

    In this letter, it is shown how direction-of-arrival (DoA) estimation for electronically steerable parasitic array radiator (ESPAR) antennas, which are designed to be integrated within wireless sensor network nodes, can be improved by applying support vector classification approach to received signal strength (RSS) values recorded at an antenna's output port. The proposed method relies on ESPAR antenna's radiation patterns measured...

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  • Simple 2-D Direction-of-Arrival Estimation Using an ESPAR Antenna

    Publikacja

    - IEEE Antennas and Wireless Propagation Letters - Rok 2017

    In this letter, it has been shown how an electronically steerable parasitic array radiator (ESPAR) antenna can be used for 2-D direction-of-arrival (DoA) estimation employing received signal strength (RSS) values only. The proposed approach relies on changes in RSS values recorded at the antenna output port observed for different vertical and horizontal directions, while antenna’s main beam sweeps 360° area around the ESPAR antenna. Based...

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  • RSS-Based DoA Estimation Using ESPAR Antenna for V2X Applications in 802.11p Frequency Band

    Publikacja

    - Rok 2020

    In this paper, we have proposed direction-of arrival (DoA) estimation of incoming signals for V2X applications in 802. 11p frequency band, based on recording of received signal strength (RSS) at electronically steerable parasitic array radiator (ESPAR) antenna's output port. The motivation of the work was to prove that ESPAR antenna used to increase connectivity and security in V2X communication can be also used for DoA estimation....

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  • BADANIA POMIAROWE I ANALIZA PRZYDATNOŚCI METODY RSS DLA POTRZEB RADIOLOKALIZOWANIA

    Publikacja

    - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2013

    Referat dotyczy lokalizowania obiektów w sieciach radiokomunikacyjnych, pracujących w specyficznym środowisku propagacji fal radiowych, jakim jest terminal kontenerowy. Opisano podstawy teoretyczne metody RSS (Received Signal Strength), w której szacuje się odległości pomiędzy stacjami referencyjnymi a lokalizowanym obiektem na podstawie znajomości modelu propagacyjnego opisującego tłumienie fali radiowej. Przedstawiono metodykę...

  • Efficient RSS-Based DoA Estimation for ESPAR Antennas Using Multiplane SDR Calibration Approach

    Publikacja

    - Rok 2018

    In this paper, we have introduced a new method to improve overall efficiency of direction-of-arrival (DoA) estimation scheme relying on received signal strength (RSS) values measured at the output port of electronically steerable parasitic array radiator (ESPAR) antenna. The proposed approach uses software-defined radio (SDR) setup and power pattern cross-correlation (PPCC) estimator involving multiple calibration planes. By placing...

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  • A novel calibration method for RSS-based DoA estimation using ESPAR antennas

    Publikacja

    - Rok 2018

    In this paper, we introduce a new calibration method that can successfully be used in direction of arrival (DoA) estimation using electronically steerable parasitic array radiator (ESPAR) antennas and employing power-pattern cross-correlation (PPCC) algorithm, which relies on received signal strength (RSS) values recorded at the antenna output port. Instead of the commonly used two-step approach, during which ESPAR antenna calibration...

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  • Direction-of-Arrival Estimation Using an ESPAR Antenna with Simplified Beam Steering

    Publikacja

    - Rok 2017

    In this paper, it has been shown, how electronically steerable parasitic array radiator (ESPAR) antenna, in which beam steering is done in a simple way, can be used for directionof- arrival (DoA) estimation of an unknown signal impinging the antenna. The concept is based on an ESPAR antenna having twelve parasitic elements, in which beam switching is realized by RF switches providing required loads to its parasitic elements. Numerical...

  • RSS-based DoA Estimation Using ESPAR Antennas and Interpolated Radiation Patterns

    Publikacja

    - IEEE Antennas and Wireless Propagation Letters - Rok 2018

    In this letter, it is shown how an algorithm, which employs received signal strength (RSS) values in order to estimate direction-of-arrival (DoA) of impinging signals in wireless sensor network (WSN) nodes equipped with electronically steerable parasitic array radiator (ESPAR) antennas, can easily be improved by applying an interpolation algorithm to radiation patterns recorded in the calibration phase of the DoA estimation process....

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  • RSS-Based DoA Estimation Using ESPAR Antenna Radiation Patterns Spline Interpolation

    Publikacja

    - Rok 2018

    In this paper, it is shown how power pattern crosscorrelation (PPCC) algorithm, which relies on received signal strength (RSS) values recorded at electronically steerable parasitic array radiator (ESPAR) antenna output port, used for direction-of-arrival (DoA) estimation, can easily be improved by applying spline interpolation to radiation patterns recorded in the calibration phase of the DoA estimation process. The proposed method...

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  • Accurate PPCC-Based DoA Estimation Using Multiple Calibration Planes for WSN Nodes Equipped with ESPAR Antennas

    Publikacja

    - Rok 2018

    In this paper, we have introduced a new direction-of-arrival (DoA) estimation method, which relies on received signal strength (RSS) values measured at the output port of electronically steerable parasitic array radiator (ESPAR) antenna and uses the power pattern cross-correlation (PPCC) estimator. In the method, we have successfully incorporated measurements of ESPAR antenna's radiation patterns performed at multiple calibration...

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  • Improved RSS-Based DoA Estimation Accuracy in Low-Profile ESPAR Antenna Using SVM Approach

    Publikacja

    - Rok 2019

    In this paper, we have shown how the overall performance of direction-of-arrival (DoA) estimation using lowprofile electronically steerable parasitic array radiator (ESPAR) antenna, which has been proposed for Internet of Things (IoT) applications, can significantly be improved when support vector machine (SVM) approach is applied. Because the SVM-based DoA estimation method used herein relies solely on received signal strength...

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  • Influence of ESPAR antenna radiation patterns shape on PPCC-based DoA estimation accuracy

    Publikacja

    - Rok 2018

    In the article, we show the influence of three different electronically steerable parasitic array radiator (ESPAR) antenna radiation patterns on the overall direction of arrival (DoA) estimation accuracy when power-pattern cross-correlation (PPCC) algorithm, relying on received signal strength (RSS) values, is used for the estimation. The ESPAR antenna designs were obtained for three optimization goals, which resulted in different...

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  • RSS-Based DoA Estimation Using ESPAR Antenna for V2X Applications in 802.11p Frequency Band

    Publikacja

    - Rok 2020

    In this paper, we have proposed direction-of arrival (DoA) estimation of incoming signals for V2X applications in 802. 11p frequency band, based on recording of received signal strength (RSS) at electronically steerable parasitic array radiator (ESPAR) antenna's output port. The motivation of the work was to prove that ESPAR antenna used to increase connectivity and security in V2X communication can...

    Pełny tekst do pobrania w portalu

  • Improved RSS-Based DoA Estimation Accuracy in Low-Profile ESPAR Antenna Using SVM Approach

    Publikacja

    - Rok 2019

    In this paper, we have shown how the overall performance of direction-of-arrival (DoA) estimation using lowprofile electronically steerable parasitic array radiator (ESPAR) antenna, which has been proposed for Internet of Things (IoT) applications, can significantly be improved when support vector machine (SVM) approach is applied. Because the SVM-based DoA estimation method used herein relies solely...

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  • Calibration-Free Single-Anchor Indoor Localization Using an ESPAR Antenna

    Publikacja

    - SENSORS - Rok 2021

    In this paper, we present a novel, low-cost approach to indoor localization that is capable of performing localization processes in real indoor environments and does not require calibration or recalibration procedures. To this end, we propose a single-anchor architecture and design based on an electronically steerable parasitic array radiator (ESPAR) antenna and Nordic Semiconductor nRF52840 utilizing Bluetooth Low Energy (BLE)...

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  • Influence of ESPAR Antenna Radiation Patterns Shape on PPCC-Based DoA Estimation Accuracy

    Publikacja

    - Rok 2018

    In the article, we show the influence of three different electronically steerable parasitic array radiator (ESPAR) antenna radiation patterns on the overall direction of arrival (DoA) estimation accuracy when power-pattern cross-correlation (PPCC) algorithm, relying on received signal strength (RSS) values, is used for the estimation. The ESPAR antenna designs were obtained for three optimization...

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  • Jacek Stefański prof. dr hab. inż.

    Osoby

    Wydział Elektroniki, Telekomunikacji i Informatyki, Katedra Systemów i Sieci Radiokomunikacyjnych

    Jacek Stefański ukończył studia na Wydziale Elektroniki Politechniki Gdańskiej (PG) w 1993 r. W 2000 r. uzyskał stopień doktora nauk technicznych w dyscyplinie telekomunikacja, w 2012 r. stopień doktora habilitowanego, natomiast w 2020 r. tytuł profesora nauk inżynieryjno-technicznych. Obecnie pracuje na stanowisku profesora w Katedrze Systemów i Sieci Radiokomunikacyjnych (KSiSR) PG. W latach 2005-2009 był zatrudniony w Instytucie...

  • ESPAR Antenna-Based WSN Node With DoA Estimation Capability

    Publikacja

    - IEEE Access - Rok 2020

    In this paper, we present a low-cost energy-efficient electronically steerable parasitic array radiator (ESPAR) antenna-based wireless sensor network (WSN) node designed for IEEE 802.15.4 standard that is capable of performing direction of arrival (DoA) estimation in real-life outdoor environments. To this end, we propose the WSN node architecture, design and realization that utilizes NXP JN5168 radio frequency (RF) wireless transceiver...

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  • Analiza i badania pomiarowe dokładności lokalizowania terminali ruchomych w sieciach komórkowych

    Publikacja

    - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2010

    Jakość oferowanych przez operatorów sieci komórkowych usług o wartości wzbogaconej (usług dodanych) zależy od efektywności metod estymacji położenia geograficznego terminala ruchomego MS (Mobile Station). Dokładność istniejących w sieciach komórkowych metod lokalizacyjnych jest niewystarczająca, szczególnie w odniesieniu do usług związanych z wywołaniem w niebezpieczeństwie. Obecnie, do najbardziej popularnej w sieciach komórkowych...

  • Badanie metod i projektowanie usług lokalizacyjnych w sieciach radiokomunikacyjnych

    Publikacja

    - Rok 2012

    W pracy przedstawiono wybrane problemy lokalizowania obiektów w sieciach radiokomunikacyjnych, w tym komórkowych. W pierwszej kolejności zostały przedstawione nowe zasady budowy i działania systemu wywołania w niebezpieczeństwie na morzu, z wykorzystaniem infrastruktury sieci komórkowej. Na podstawie zebranych danych pomiarowych w warunkach morskich została opracowana nowa, bardziej dokładna metoda estymacji położenia terminala...

  • Low-Profile ESPAR Antenna for RSS-Based DoA Estimation in IoT Applications

    Publikacja

    - IEEE Access - Rok 2019

    In this paper, we have introduced a low-profile electronically steerable parasitic array radiator (ESPAR) antenna that can successfully be used to estimate the direction-of-arrival (DoA) of incoming signals in wireless sensor network (WSN) applications, in which the height of the complete antenna has to be low. The proposed antenna is over three times lower than high-profile ESPAR antenna designs currently available in the literature...

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  • Detection of the First Component of the Received LTE Signal in the OTDoA Method

    Publikacja

    - WIRELESS COMMUNICATIONS & MOBILE COMPUTING - Rok 2019

    In a modern world there is a growing demand for localization services of various kinds. Position estimation can be realized via cellular networks, especially in the currently widely deployed LTE (Long Term Evolution) networks. However, it is not an easy task in harsh propagation conditions which often occur in dense urban environments. Recently, time-methods of terminal localization within the network have been the focus of attention,...

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  • Dynamic Signal Strength Mapping and Analysis by Means of Mobile Geographic Information System

    Publikacja

    - Metrology and Measurement Systems - Rok 2017

    Bluetooth beacons are becoming increasingly popular for various applications such as marketing or indoor navigation. However, designing a proper beacon installation requires knowledge of the possible sources of interference in the target environment. While theoretically beacon signal strength should decay linearly with log distance, on-site measurements usually reveal that noise from objects such as Wi-Fi networks operating in...

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  • Michał Lech dr inż.

    Osoby

    Michał Lech was born in Gdynia in 1983. In 2007 he graduated from the faculty of Electronics, Telecommunications and Informatics of Gdansk University of Technology. In June 2013, he received his Ph.D. degree. The subject of the dissertation was: “A Method and Algorithms for Controlling the Sound Mixing Processes with Hand Gestures Recognized Using Computer Vision”. The main focus of the thesis was the bias of audio perception caused...

  • Artur Gańcza mgr inż.

    Osoby

    Katedra Sygnałów i Systemów WETI

    I received the M.Sc. degree from the Gdańsk University of Technology (GUT), Gdańsk, Poland, in 2019. I am currently a Ph.D. student at GUT, with the Department of Automatic Control, Faculty of Electronics, Telecommunications and Informatics. My professional interests include speech recognition, system identification, adaptive signal processing and linear algebra.

  • Zbigniew Czaja dr hab. inż.

    Osoby

    Katedra Metrologii i Optoelektroniki

    Zbigniew Czaja was born in Czluchow, Poland, in 1970. He graduated from Gdansk University of Technology, Faculty of Electronics, Telecommunications and Informatics in 1995. The Ph.D. degree in electronics was received in 2001 from the same university. He worked as assistant professor at this university from 2002 to 2013. In 2014, he qualified as an associate professor, and in 2017, as a professor. His research interests are in...

  • A Review of Antennas for Indoor Positioning Systems

    Publikacja

    - International Journal of Antennas and Propagation - Rok 2012

    This paper provides a review of antennas applied for indoor positioning or localization systems. The desired requirements of thoseantennas when integrated in anchor nodes (reference nodes) are discussed, according to different localization techniques and theirperformance. The described antennas will be subdivided into the following sections according to the nature of measurements:received signal strength (RSS), time of flight (ToF),...

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  • Influence of a Radio Frequency on RF Fingerprinting Accuracy Based on Ray Tracing Simulation

    Publikacja

    - Rok 2013

    In this paper the influence of a radio signal frequency on performance of Indoor Positioning System based on fingerprinting has been examined using ray-tracing simulations. It has been simulated how spatial distribution of an RF signal strength change with the signal’s frequency. The results were used to show its’ impact on the behavior of localization algorithms that are employing RSS measurements to determine node’s position...

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  • Marek Blok dr hab. inż.

    Osoby

    Marek Blok w 1994 roku ukończył studia na kierunku Telekomunikacja wydziału Elektroniki Politechniki Gdańskiej i uzyskał tytuł mgra inżyniera. Doktorat w zakresie telekomunikacji uzyskał w 2003 roku na Wydziale Elektroniki, Telekomunikacji i Informatyki Politechniki Gdańskiej. W 2017 roku uzyskał stopień naukowy dra habilitowanego w dyscyplinie telekomunikacja. Jego zainteresowania badawcze ukierunkowane są na telekomunikacyjne...

  • Measurement and Analysis of the Radio Wave Polarisation in Off-Body Communications in Indoor Environment

    Publikacja

    - Rok 2014

    The paper describes an analysis of the radio wave polarisation in off-body communications in indoor environment. The measurement stand for polarisation measurements has been shortly described. Five investigated scenarios with different body postures and different antenna placements have been characterize. The vertical and horizontal components of received radio signal have been analysed. The measure used in analysis is a ratio...

  • Study of probe signal bandwidth influence on estimation of coherence bandwidth for underwater acoustic communication channel

    Publikacja

    - APPLIED ACOUSTICS - Rok 2021

    A signal transmitted in a shallow Underwater Acoustic Communication (UAC) channel suffers from time dispersion due to the multipath propagation and the refraction phenomena. This causes intersymbol interference of the received signal and frequency-selective fading observed in its spectrum. Coherence bandwidth is one of the key transmission parameters used for designing the physical layer of a data transmission system to minimise...

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  • Wireless Body Area Network for Preventing Self-Inoculation Transmission of Respiratory Viral Diseases

    Publikacja

    - SENSORS - Rok 2023

    This paper proposes an idea of Wireless Body Area Networks (WBANs) based on Bluetooth Low-Energy (BLE) standards to recognize and alarm a gesture of touching the face, and in effect, to prevent self-inoculation of respiratory viral diseases, such as COVID-19 or influenza A, B, or C. The proposed network comprises wireless modules placed in bracelets and a necklace. It relies on the received signal strength indicator (RSSI) measurements...

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  • INVESTIGATION OF BOTTOM SEDIMENT STRATIFICATION

    Publikacja

    - HYDROACOUSTICS - Rok 2014

    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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  • Single-Anchor Indoor Localization Using ESPAR Antenna

    Publikacja

    - IEEE Antennas and Wireless Propagation Letters - Rok 2016

    In this paper a new single-anchor indoor localization concept employing Electronically Steerable Parasitic Array Radiator (ESPAR) antenna has been proposed. The new concept uses a simple fingerprinting algorithm adopted to work with directional main beam and narrow minimum radiation patterns of ESPAR antenna that scans 360° area around the base station, while the signal strength received from a mobile terminal is being recorded...

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  • Grzegorz Szwoch dr hab. inż.

    Osoby

    Katedra Systemów Multimedialnych

    Grzegorz Szwoch urodził się w 1972 roku w Gdańsku. W latach 1991-1996 studiował na wydziale Elektroniki Politechniki Gdańskiej. W roku 1996 ukończył studia w Zakładzie Inżynierii Dźwięku (obecnie Katedra Systemów Multimedialnych), broniąc pracę dyplomową pt. Modelowanie fizyczne wybranych instrumentów muzycznych. W tym samym roku dołączył do zespołu badawczego Katedry jako uczestnik Studium Doktoranckiego. Od stycznia 2001 roku...

  • Continuous wave sonar with hyperbolic frequency modulation keyed by pseudo-random sequence

    Publikacja

    - HYDROACOUSTICS - Rok 2016

    A CW FM type sounding signal is used in the classical solution of silent sonar. While the signal provides a relatively simple implementation of digital signal processing, and ensures good detection conditions, unfortunately, in the presence of the Doppler effect, distance measurement results tend to be wrong. This is due to the fact that the received signal’s instantaneous frequency value is dependent both on the distance to the...

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  • Detection and Direction-of-Arrival Estimation of Weak Spread Spectrum Signals Received with Antenna Array

    Publikacja

    - Electronics - Rok 2021

    This paper presents a method for the joint detection and direction of arrival (DOA) estimation of low probability of detection (LPD) signals. The proposed approach is based on using the antenna array to receive spread-spectrum signals hidden below the noise floor. Array processing exploits the spatial correlation between phase-delayed copies of the signal and allows us to evaluate the parameter used to make the decision about the...

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  • Analiza wpływu błędu częstotliwości próbkowania na sygnały odbierane w systemie LTE

    Publikacja

    - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2016

    W artykule dokonano analizy wpływu błędu częstotliwości próbkowania w platformie radia programowalnego na odbierany sygnał LTE (Long Term Evolution).

  • Noise effect on parameters of quiet sonar with code modulation

    Publikacja

    - Vibrations in Physical Systems - Rok 2023

    Earlier publications of the paper authors have shown that the use of code keying mixed with the CW FM sound signal allows the significant reduction in the distance measurement error, compared to classic silent CW FM sonar. In addition to the code modulation parameters, the magnitude of this error is influenced by the received input acoustic noise. The article shows the dependence of the input signal-to-noise ratio and the sound...

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  • New First - Path Detector for LTE Positioning Reference Signals

    Publikacja

    - Rok 2014

    In today's world, where positioning applications reached a huge popularity and became virtually ubiquitous, there is a strong need for determining a device location as accurately as possible. A particularly important role in positioning play cellular networks, such as Long Term Evolution (LTE). In the LTE Observed Time Difference of Arrival (OTDOA) positioning method, precision of device location estimation depends on accuracy...

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  • Sonar Pulse Detection Using Chirp Rate Estimation and CFAR Algorithms

    Publikacja

    - HYDROACOUSTICS - Rok 2017

    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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  • Wojciech Gumiński dr inż.

    Osoby

    Katedra Teleinformatyki

    Wojciech Gumiński ukończył studia na Wydziale Elektroniki, Telekomunikacji I Informatyki w 1991 r. W roku 2003 uzyskał stopień doktora nauk technicznych. Zainteresowania naukowe obejmują architektury sieciowe i protokoły telekomunikacyjne oraz cyfrowe przetwarzanie sygnałów. Uczestniczył jako  główny wykonawca w szeregu projektach, między innymi: Inżynieria Internetu Przyszłości, PL-LAB 2020 i Internet na Bałtyku. Publikacje...

  • Suppression of distortions in signals received from Doppler sensor for vehicle speed measurement

    Publikacja

    - Rok 2018

    Doppler sensors are commonly used for movement detection and speed measurement. However, electromagnetic interference and imperfections in sensor construction result in degradation of the signal to noise ratio. As a result, detection of signals reflected from moving objects becomes problematic. The paper proposes an algorithm for reduction of distortions and noise in the signal received from a simple, dual-channel type of a Doppler...

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  • How to provide fair service for V2I communications in VANETs?

    Publikacja

    - Ad Hoc Networks - Rok 2016

    In this paper, we focus on fairness issues of Vehicle-to-Infrastructure (V2I) communications. In particular, we show that under a common technique of selection of RSUs by OBUs based on the received signal strength, a vast variability of a number of OBUs connected to RSUs can be observed leading to inefficient/unfair service provided by RSUs. To overcome this problem, we propose an algorithm for RSU selection called RSEL to obtain...

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  • Określenie położenia za pomocą sieci bezprzewodowej w standardzie ZigBee

    Publikacja

    - Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Rok 2008

    Mimo wprowadzenia systemu nawigacji GPS, nadal istnieje zapotrzebowanie na inne, tańsze systemy lokalizacji położenia, w szczególności pracujące w pomieszczeniach, gdzie często nie dochodzi sygnał z satelity. Taki system można zrealizować za pomocą bezprzewodowej sieci czujników w standardzie ZigBee za pomocą kilku różnych metod. W pracy przedstawiono metodę RSSI (ang.: Received Signal Strength Indicator) oceny odległości za pomocą...

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  • Selected properties and parameters of radio channel impulse response estimation in ISM 2.4 GHz band

    Publikacja

    - Proceedings of SPIE - Rok 2019

    The article presents experimental research indicating that the impulse response of the communication channel, determined in practice, are not of an universal character, but only represent its approximate value for the frequency on which this measurement was made. Phases for each of the replicas of the measurement signal were determined during the analysis of the received signals in the baseband. Phase changes of individual replicas...

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  • Detection and Mitigation of GPS Spoofing Based on Antenna Array Processing

    Publikacja

    - Journal of Applied Research and Technology - Rok 2015

    In this article authors present an application of spatial processing methods for GPS spoofing detection and mitigation. In the first part of this article, a spoofing detection method, based on phase delay measurements, is proposed. Accuracy and precision of phase delay estimation is assessed for various qualities of received signal. Spoofing detection thresholds are determined. Efficiency of this method is evaluated in terms of...

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  • The lognormal model of the multipath fading channel

    Dane Badawcze
    open access - seria: Simulations of multipath fading channels using the Monte-Carlo method

    The dataset contains the results of simulations that are part of the research on modelling the multipath fading in the communication channel. The lognormal fading envelope is generated using the Monte-Carlo simulation (MCS) in the LabVIEW programming environment.

  • The radiated immunity test of an astable multivibrator at over-normative field strengths

    Dane Badawcze
    open access - seria: Radiated immunity measurements of electronic devices in a GTEM cell

    The dataset presents a result of measurements that are a part of electromagnetic field immunity tests. The radiated, radio frequency, immunity tests were carried out for a typical astable electronic multivibrator. Tests of immunity of electronic systems to radiated radio frequency (RF) disturbances in the frequency range from 80 MHz to 1 GHz were performed...

  • DS-CDMA receiver in Software Defined Radio technology. Admission to the implementation of a RAKE receiver

    Publikacja

    - Rok 2010

    Programmable radio is one of the latest trends in the construction of multi-standard receivers. The technology, called Software Defined Radio (SDR), is also an ideal test platform that allows to try out different algorithms of signal receiving. This particular feature led to choose this platform to implement a DS-CDMA receiver (Direct Sequence Code Division Multiple Access). The use of SDR allows for a gradual upgrade of data processing...

  • The development of an underwater telephone for digital communication purposes

    Publikacja

    - HYDROACOUSTICS - Rok 2016

    The underwater telephone HTL-10 has been designed to provide voice and data communication between helicopter and submarines using acoustic waves. It works in a half-duplex mode and uses analogue power-efficient modulation in the form of a single side-band, suppressed carrier, in a wide range of frequencies. It generates the transmitted signal, and processes the received signals. It is implemented with the use of digital signal...

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  • Mobile Networks' Analysis in Terms of QoS Performance Assessment

    Publikacja

    - Rok 2023

    Quality of service (QoS) assessment is one of the basic processes carried out by mobile network operators (MNOs) and regulators of the telecommunications market. Usually, professional companies carry out measurements for various country areas and use cases (scenarios). In this paper, we show exemplary measurement results carried out in drive tests in the vicinity of the Polish capital by a professional company. The measurement...

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  • Path Loss Measurements in Wideband Radio Link Designed for Maritime Environment

    Publikacja

    - Rok 2018

    In the article, the research and analysis of path loss in designed and evaluated digital radio link for high-speed data transmission in maritime environment is presented. Collected samples of received signal were used to determine the mean path loss and its standard deviation. Measuring campaign was carried out in a real maritime conditions. The mean value of path loss reached 126 dB on a distance of 11.16 km.

  • A system for Direction-Of-Arrival estimation in ISM 2.4 GHz frequency band based on ESPAR antenna and SDR technology

    Publikacja
    • P. Kwapisiewicz

    - Rok 2018

    Determination of the direction of the signal arrival (DOA) finds many applications in various areas of science and industry. Knowledge of DOA is used, among others to determine the position of a satellite with a low Earth orbit (LEO), localization of people and things as well as in research of wireless communication systems, for instance the determination of the number of...

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  • Innovative method of localization airplanes in VCS (VCS-MLAT) distributed system

    Publikacja

    - Rok 2019

    The article presents the concept and the structure of the localization module. The prototype module is the part of the VCS (VCS-MLAT) localization distributed system. The device receives the audio signal transmitted in airplanes band (118 MHz – 136 MHz). Received data with the timestamps are send to the main server. The data from multiple devices estimates the localization of the airplane. The main aim of the project is the analysis...

  • The Weibull model of the multipath fading channel

    Dane Badawcze
    open access - seria: Simulations of multipath fading channels using the Monte-Carlo method

    The dataset contains the results of simulations that are part of the research on modelling the multipath fading in the communication channel. The Weibull fading envelope is generated using the Monte-Carlo simulation (MCS) in the LabVIEW programming environment.

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

    Publikacja

    - HYDROACOUSTICS - Rok 2015

    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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  • Radar Signal Parameters Estimation Using Phase Accelerogram in the Time-Frequency Domain

    Publikacja

    - IEEE SENSORS JOURNAL - Rok 2019

    Radar signal parameter estimation, in the context of the reconstruction of the received signal in a passive radar utilizing other radars as a source of illumination, is one of the fundamental steps in the signal processing chain in such a device. The task is also a crucial one in electronic reconnaissance systems, e.g. ELINT (Electronic Intelligence) systems. In order to obtain accurate results it is important to measure, estimate...

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  • A New Direct-Sequence Spread Spectrum Signal Detection Method for Underwater Acoustic Communications in Shallow-Water Channel

    Publikacja

    - Vibrations in Physical Systems - Rok 2021

    Direct-Sequence Spread Spectrum (DSSS) is one of the modulation and coding techniques used in Underwater Acoustic Communication (UAC) systems for reliable data transmision even at low signal levels. However, in a shallow water channel, there is a strong multipath propagation which causes a phase fluctuation of the received signal, affecting the performance of the spread-spectrum system. The article presents a differential method...

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  • The Rayleigh model of the multipath fading channel

    Dane Badawcze
    open access - seria: Simulations of multipath fading channels using the Monte-Carlo method

    The dataset contains the results of simulations that are part of the research on modelling the multipath fading in the communication channel. The Rayleigh fading envelope is generated using the Monte-Carlo simulation (MCS) in the LabVIEW programming environment.

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

    Publikacja

    - HYDROACOUSTICS - Rok 2014

    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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  • The radiated immunity test of an astable multivibrator in the frequency range from 100 MHz to 300 MHz

    Dane Badawcze
    open access - seria: Radiated immunity measurements of electronic devices in a GTEM cell

    The dataset presents a result of measurements that are a part of electromagnetic field immunity tests. The radiated, radio frequency, immunity tests were carried out for a typical astable electronic multivibrator. Tests of immunity of electronic systems to radiated radio frequency (RF) disturbances in the frequency range from 100 MHz to 300 MHz were...

  • Path Loss Analysis for the IoT Applications in the Urban and Indoor Environments

    Publikacja

    - Rok 2020

    The Internet of Things (IoT) networks concept implies their presence in a various and untypical locations, usually with a disturbed radio signals propagation. In the presented paper an investigation of an additional path loss observed in an underground environment was described. The proposed measurement locations correspond to the operation areas of rapidly growing narrowband IoT (NBIoT) networks, the ones using the Long Term Evolution...

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  • DoA Estimation Using Reconfigurable Antennas in Millimiter-Wave Frequency 5G Systems

    Publikacja

    - Rok 2019

    To achieve low latency and high throughputs, future 5G systems will have to utilize complex antenna systems able to provide beamforming and direction-of-arrival (DoA) estimation capabilities. Most of the concepts available in the literature rely on analog or digital beamforming, which is well developed and can be used both at a base station and in a user terminal. However, in applications, in which...

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  • Impact of radio wave polarisation on off-body communications in indoor environments

    Publikacja

    - Rok 2015

    This paper describes the measurements and the analysis of the impact of radio wave polarisation on off-body communications in Body Area Networks in indoor environments. Measurements on polarisation impact are briefly described. Five investigated scenarios with different body postures and different antenna placements are characterised. The difference between the vertical and horizontal components of the received radio signal are...

  • Geospatial Coverage and Signal Quality Measurements of Terrestrial DAB+ Network in Northern Poland

    Publikacja

    - Rok 2020

    Modern signal coverage maps are prepared based on industry-standard radio propagation models, which take into account a number of parameters, including: type of antenna, distance from the transmitter, type of terrain, etc. However, such simulations are prone to location-specific inaccuracies, and should be verified with in-situ measurements. This paper presents results of a field test of a terrestrial DAB+ (Digital Audio Broadcasting...

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  • Zdzisław Kowalczuk prof. dr hab. inż.

    Osoby

    Katedra Systemów Decyzyjnych i Robotyki

    W 1978 ukończył studia w zakresie automatyki i informatyki na Wydziale Elektroniki Politechniki Gdańskiej, następnie rozpoczął pracę na macierzystej uczelni. W 1986 obronił pracę doktorską, w 1993 habilitował się na Politechnice Śląskiej na podstawie pracy Dyskretne modele w projektowaniu układów sterowania. W 1996 mianowany profesorem nadzwyczajnym, w 2003 otrzymał tytuł profesora nauk technicznych. W 2006 założył i od tego czasu...

  • The standard radiated immunity test of an astable multivibrator at a normative field strength

    Dane Badawcze
    open access - seria: Radiated immunity measurements of electronic devices in a GTEM cell

    The dataset presents a result of measurements that are a part of electromagnetic field immunity tests. The radiated, radio frequency, immunity tests were carried out for a typical astable electronic multivibrator. Tests of immunity of electronic systems to radiated radio frequency (RF) disturbances in the frequency range from 80 MHz to 1 GHz are performed...

  • Accuracy analysis of the RSSI BLE SensorTag signal for indoor localization purposes

    Publikacja

    - Rok 2016

    In this paper we describe possibility of use the RSSI signal (Radio Signal Strength Indication) from Texas Instruments SensorTag CC2650 for indoor positioning purposes. This idea is not a new but in our opinion it is possible to use SensorTags with Bluetooth LE wireless interface for positioning inside buildings in such applications as people findings in hospitals, senior come care, etc. RSSI is mostly selected as the sensor localization...

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  • Analysis of radiometric signal in sedimentating suspension flow in open channel

    Publikacja

    - Rok 2014

    The article discusses issues related to the estimation of the sedimentating solid particles average flow velocity in an open channel using radiometric methods. Due to the composition of the compound, which formed water and diatomite, received data have a very weak signal to noise ratio. In the process analysis the known determining of the solid phase transportation time delay the classical cross-correlation function is the most...

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  • The radiated immunity test of an astable multivibrator for various supply voltages

    Dane Badawcze
    open access - seria: Radiated immunity measurements of electronic devices in a GTEM cell

    The dataset presents a result of measurements that are a part of electromagnetic field immunity tests. The radiated, radio frequency, immunity tests were carried out for a typical astable electronic multivibrator supplied from a power supply with an output voltage of 6V and 7.5 V. Tests of immunity of electronic systems to radiated radio frequency (RF)...

  • Zastosowanie sieci neuronowych do detekcji impulsów o znanym kształcie w obecności silnego szumu i trendu

    Publikacja

    - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2023

    Detekcja impulsów w odebranym sygnale radiowym, zwłaszcza w obecności silnego szumu oraz trendu, jest trudnym zadaniem. Artykuł przedstawia propozycje rozwiązań wykorzystujących sieci neuronowe do detekcji impulsów o znanym kształcie w obecności silnego szumu i trendu. Na potrzeby realizacji tego zadania zaproponowano dwie architektury. W pracy przedstawiono wyniki badań wpływu kształtu impulsu, mocy zakłóceń szumowych oraz trendu...

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  • Phong B. Dao D.Sc., Ph.D.

    Osoby

    Phong B. Dao received the Engineer degree in Cybernetics in 2001, the M.Sc. degree in Instrumentation and Control in 2004, both from Hanoi University of Science and Technology in Vietnam, and the Ph.D. degree in Control Engineering in 2011 from the University of Twente, the Netherlands. In May 2020, Dr. Dao received the degree of D.Sc. (Habilitation) in Mechanical Engineering from the AGH University of Science and Technology, Poland....

  • Wideband Off-Body Channel Characteristics with Dynamic User

    Publikacja

    - Rok 2019

    This paper presents the preliminary results of a dynamic off-body channel characterisation study, based on wideband measurements at 5.8 GHz in an indoor environment. The Channel Impulse Response (CIR) was measured for a scenario with the user approaching and departing from the off-body antenna. A CIR deconvolution procedure was performed jointly in two polarisations, and the received signal power, Cross-Polarisation Discrimination...

  • Improving the quality of speech in the conditions of noise and interference

    Publikacja

    - Journal of the Acoustical Society of America - Rok 2018

    The aim of the work is to present a method of intelligent modification of the speech signal with speech features expressed in noise, based on the Lombard effect. The recordings utilized sets of words and sentences as well as disturbing signals, i.e., pink noise and the so-called babble speech. Noise signal, calibrated to various levels at the speaker's ears, was played over two loudspeakers located 2 m away from the speaker. In...

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  • Testing the Wide-Sense Stationarity of Bandpass Signals for Underwater Acoustic Communications

    Publikacja

    - Rok 2017

    The Underwater Acoustic Communication (UAC) systems work in communication channels characterized by a large variety of multipath propagation conditions that can additionally change over time. Designing a reliable communication system requires knowledge of the transmission parameters of the channel. There is a need for the development of adaptive signaling schemes that would dynamically optimize the signal parameters of the physical...

  • A digital implementation of the PSK transmitter and receiver as multirate algorithms of the digital signal processing

    Publikacja

    - Rok 2011

    In this paper designs of the transmitter and the receiver of PSK signals as three-rate algorithms of the digital signal processing are described. Additionally we show the examples of the transmitter and the receiver of the following signals: BPSK, QPSK. We discussed also an influence of the cascade of the shaping filter and the receiving filter on the intersymbol interference in the received complex envelope.W pracy opisano projektowanie...

  • The Suzuki model of the multipath fading channel

    Dane Badawcze
    open access - seria: Simulations of multipath fading channels using the Monte-Carlo method

    The dataset contains the results of simulations that are part of the research on modelling the multipath fading in the communication channel. The Suzuki fading envelope is generated using the Monte-Carlo simulation (MCS) in the LabVIEW programming environment.

  • Assessment of Wide-Sense Stationarity of an Underwater Acoustic Channel Based on a Pseudo-Random Binary Sequence Probe Signal

    Publikacja

    - Applied Sciences-Basel - Rok 2020

    The performances of Underwater Acoustic Communication (UAC) systems are strongly related to the specific propagation conditions of the underwater channel. Designing the physical layer of a reliable data transmission system requires a knowledge of channel characteristics in terms of the specific parameters of the stochastic model. The Wide-Sense Stationary Uncorrelated Scattering (WSSUS) assumption simplifies the stochastic description...

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  • Accuracy of Differential Phase Delay Estimation for GPS Spoofing Detection

    Publikacja

    - Rok 2013

    GPS spoofing is an attack based on transmission of false signals to target receivers, in order to force the computation of incorrect time, position or velocity information. It is a threat which is recently considered with continuously growing awareness. There is a need for effective way of GPS spoofing detection. Many groups of methods are proposed in the literature. Spatial processing methods are considered to be robust in a wide...

  • Pomiar odpowiedzi impulsowej kanału radiowego na obszarze morskim i przybrzeżnym

    Publikacja

    - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2017

    W artykule zaprezentowano wyniki pomiarów odpowiedzi impulsowej kanału radiowego na obszarze morskim i przybrzeżnym. Pomiary przeprowadzono na częstotliwości 1457 MHz a sygnałem sondującym był sygnał o paśmie 10 MHz z modulacją BPSK i pseudoprzypadkową zawartością binarną. Odbierane sygnały były rejestrowane przez dwie stacje ruchome, zainstalowane w samolocie i na łodzi patrolowej. Podczas późniejszej obróbki danych zastosowano...

  • The surface of the sensor used in the analysis of odorous substances

    Dane Badawcze
    open access - seria: Scanning Probe Microscopies data

    Human industrial activity usually leads to smaller or larger interference with the ecosystem, contributing to changes affecting the quality of life. An example may be the emission of gaseous substances, not necessarily toxic, but due to their intense smell, they can cause discomfort to people exposed to their inhalation. The problem is so important...

  • Analysis of the Capability of Deep Learning Algorithms for EEG-based Brain-Computer Interface Implementation

    Publikacja

    - Rok 2023

    Machine learning models have received significant attention for their exceptional performance in classifying electroencephalography (EEG) data. They have proven to be highly effective in extracting intricate patterns and features from the raw signal data, thereby contributing to their success in EEG classification tasks. In this study, we explore the possibilities of utilizing contemporary machine learning algorithms in decoding...

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  • Post processing and selecting data obtain with parametric sub-bottom profiler SES-2000 Standard during sounding the Gulf of Gdansk

    Publikacja

    - Rok 2012

    The main goal of the paper is to describe the results of sounding the Gulf of Gdansk seabed using a parametric sub-bottom profiler SES-2000 Standard. Quality of obtained during trials data depends inter alia on proper location of antenna to reduce influence of pitch, roll, heave and ship noise (bubbles from propeller and a hull flow, vibration from main engine and peripheral devices). Furthermore calibration of complementary units...

  • Study of the Performance of DSSS UAC System Depending on the System Bandwidth and the Spreading Sequence

    Publikacja

    - SENSORS - Rok 2021

    A signal transmitted in an Underwater Acoustic Communication (UAC) system operating in a shallow-water channel suffers from strong time dispersion due to multipath propagation. This causes the Inter-Symbol Interference (ISI) observed in the received signal, which significantly limits the communication system’s reliability and transmission rate. In such propagation conditions, the Direct-Sequence Spread Spectrum (DSSS) method is...

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  • Janusz Nieznański prof. dr hab. inż.

    Osoby

    Zakład Przekształtników i Magazynowania Energii, Politechnika Gdańska

    Urodził się w 1957 r. w Gdańsku. Jest absolwentem Wydziału Elektrycznego Politechniki Gdańskiej (1981). W  1990 r. uzyskał stopień doktora, w 1999 r. stopień doktora habilitowanego, a w 2015 r. tytuł profesora. Jest pracownikiem naukowo-dydaktycznym Politechniki Gdańskiej nieprzerwanie od ukończenia studiów. Jego zainteresowania naukowe obejmują sterowanie, diagnostykę, modelowanie i symulację układów energoelektronicznych i napędowych,...

  • Auxetic foams

    Publikacja

    - Rok 2012

    This paper presents a method of producing auxetic polyurethane foams (PUFs) and their unique properties. The experience was based on a synthesis of traditional flexible polyurethane foam and thermal conversion to auxetic foam. The foam specimens were transformed from conventional Poisson's ratio to auxetic (negative Poisson's ratio) [1]. Basic research was performed to determine the mechanical properties and cell structure. Auxetic...

  • seafloor characterisation combined approach using multibeam sonar echo signal processing and image analysis

    Publikacja

    - Rok 2010

    The authors propose the approach to seafloor characterisation which relies on the combined, concurrent use of two different techniques: (i) multibeam sonar image analysis and (ii) multibeam seabed echoes processing. The first technique is based on constructing the grey-level sonar images of the seabed extracted from the echoes received in the consecutive soundings. Then, the set of parameters describing the local region of sonar...

  • Marking the Allophones Boundaries Based on the DTW Algorithm

    Publikacja

    - Rok 2018

    The paper presents an approach to marking the boundaries of allophones in the speech signal based on the Dynamic Time Warping (DTW) algorithm. Setting and marking of allophones boundaries in continuous speech is a difficult issue due to the mutual influence of adjacent phonemes on each other. It is this neighborhood on the one hand that creates variants of phonemes that is allophones, and on the other hand it affects that the border...

  • Jerzy Konorski dr hab. inż.

    Osoby

    Katedra Teleinformatyki

    Jerzy Konorski otrzymał tytuł mgr inż. telekomunikacji na Poitechnice Gdańskiej, zaś stopień doktora n.t. w dyscyplinie informatyka w Instytucie Podstaw Informatyki PAN. W r. 2007 obronił rozprawę habilitacyjną na Wydziale Elektroniki, Telekomnikacji i Informatyki PG. Jest autorem ponad 150 publikacji naukowych, prowadził projekty naukowo-badawcze finansowane ze środków Komitetu Badań Naukowych, UE, US Air Force Office of Scientific...

  • Sensing Direction of Human Motion Using Single-Input-Single-Output (SISO) Channel Model and Neural Networks

    Publikacja

    - IEEE Access - Rok 2022

    Object detection Through-the-Walls enables localization and identification of hidden objects behind the walls. While numerous studies have exploited Channel State Information of Multiple Input Multiple Output (MIMO) WiFi and radar devices in association with Artificial Intelligence based algorithms (AI) to detect and localize objects behind walls, this study proposes a novel non-invasive Through-the-Walls human motion direction...

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  • Skłonność do rywalizacji a intencje przedsiębiorcze – o różnicach międzypłciowych

    Publikacja

    - Przedsiębiorczość i Zarządzanie - Rok 2017

    According to the person-environment fit model people are more inclined to choose particular careers paths over other depending on their individual characteristics. They are also more likely to be satisfied with a career path that matches their characteristics and less likely to experience negative consequences including strain. In previous research several characteristics of entrepreneurs which differentiate them from non-entrepreneurs...

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  • Stress Relaxation Behaviour Modeling in Rigid Polyurethane (PU) Elastomeric Materials

    Publikacja
    • P. Zielonka
    • K. Junik
    • S. Duda
    • T. Socha
    • K. Kula
    • A. Denisiewicz
    • O. Kayode
    • W. Macek
    • G. Lesiuk
    • W. Błażejewski

    - Materials - Rok 2023

    Polyurethane (PU) has been used in a variety of industries during the past few years due to its exceptional qualities, including strong mechanical strength, good abrasion resistance, toughness, low-temperature flexibility, etc. More specifically, PU is easily “tailored” to satisfy particular requirements. There is a lot of potential for its use in broader applications due to this structure–property link. Ordinary polyurethane items...

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  • A Novel Method for Intelligibility Assessment of Nonlinearly Processed Speech in Spaces Characterized by Long Reverberation Times

    Publikacja

    - SENSORS - Rok 2022

    Objective assessment of speech intelligibility is a complex task that requires taking into account a number of factors such as different perception of each speech sub-bands by the human hearing sense or different physical properties of each frequency band of a speech signal. Currently, the state-of-the-art method used for assessing the quality of speech transmission is the speech transmission index (STI). It is a standardized way...

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  • System wykrywania i przeciwdziałania spoofingowi GPS

    Publikacja

    - Rok 2016

    Spoofing w systemach nawigacji satelitarnej jest atakiem elektronicznym, który polega na nieuprawnionej emisji sygnałów stanowiących imitacje rzeczywistych sygnałów odbieranych z satelitów. Powoduje on wyznaczenie nieprawidłowych informacji o czasie, położeniu i prędkości odbiornika. Z uwagi na trudność jego wykrycia, spoofing stanowi poważniejsze zagrożenie niż proste zagłuszanie sygnałów zakłóceniem o dużej mocy (ang. jamming)....

  • Miniature reconfigurable antenna

    Publikacja
    • R. Baranowski

    - Rok 2020

    This work concerns the design of a miniature, low-profile reconfigurable antenna based on Huygens metamaterial sources for frequency f0 = 2.45 GHz. Two planar Huygens sources were designed consisting of near-field resonators. Sources are excited from a specially designed reconfigurable control system. Thanks to the two PIN diodes, the system can realize two cardioid radiation characteristics with...

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  • Comparison of noise reduction methods in radiometric correlation measurements of two-phase liquid-gas flows

    Publikacja

    - MEASUREMENT - Rok 2018

    Two-phase liquid-gas flows occur frequently in the mining, energy, chemical, and petrochemical industries. One of non-contact methods used to analyse these flows is the gamma ray absorption method. However, the signals received from radiation detectors contain a significant stochastic noise, which makes them difficult to analyse. The article describes four methods of noise reduction in cross-correlation measurements of water-air...

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  • Investigation of Continuous Wave Jamming in an IEEE 802.15.4 Network

    Publikacja

    - Rok 2018

    This paper presents how continuous wave jamming affects IEEE 802.15.4 network. To this end, an office-based measurement setup has been proposed. Within the measurement area, 25 nodes have been set up in order to create a IEEE 802.15.4 tree-based test network structure. A dedicated jamming device that generates and transmits a continuous wave signal has been developed. Several tests have been conducted and presented to demonstrate...

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  • Distortion of speech signals in the listening area: its mechanism and measurements

    Publikacja

    - Rok 2014

    The paper deals with a problem of the influence of the number and distribution of loudspeakers in speech reinforcement systems on the quality of publicly addressed voice messages, namely on speech intelligibility in the listening area. Linear superposition of time-shifted broadband waves of a same form and slightly different magnitudes that reach a listener from numerous coherent sources, is accompanied by interference effects...

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