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Search results for: TDOA

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

    Publication

    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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  • Multiple sound sources localization in real time using acoustic vector sensor

    Method and preliminary results of multiple sound sources localization in real time using the acoustic vector sensor were presented in this study. Direction of arrival (DOA) for considered source was determined based on sound intensity method supported by Fourier analysis. Obtained spectrum components for considered signal allowed to determine the DOA value for the particular frequency independently. The accuracy of the developed...

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  • Multiple sound sources localization in free field using acoustic vector sensor

    Publication

    Method and preliminary results of multiple sound sources localization in free field using the acoustic vector sensor were presented in this study. Direction of arrival (DOA) for considered source was determined based on sound intensity method supported by Fourier analysis. Obtained spectrum components for considered signal allowed to determine the DOA value for the particular frequency independently. The accuracy of the developed...

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  • Ocena koncepcji zapewniania determinizmu w rozwiązaniach ethernet wykorzystywanych w sieciach przemysłowych

    Publication

    - Year 2006

    W pracy przedstawiono koncepcje zapewniania determinizmu w rozwiązaniach Ethernet wprowadzanych w środowiskach przemysłowych. Omówiono zarówno metody oparte o mniej lub bardziej zmodyfikowany mechanizm dostępu CSMA/CD jak też koncepcje eliminujące ten mechanizm, w tym oparte o rotację Tokena, TDMA i Master/Slave. Zwrócono uwagę na problemy zapewniania determinizmu przez systemy przełączane. Oceniono poszczególne rozwiązania wskazując...

  • Stanowisko do badania adaptacyjnego doboru parametrów interfejsu radiowego sieci ad hoc

    Publication

    - Year 2016

    W artykule przedstawiono stanowisko do badania opracowanej metody adaptacyjnej konfiguracji interfejsu radiowego sieci ad hoc. Badania skupiono wokół dynamicznej zmiany przepływności łącza radiowego do komunikacji pomiędzy węzłami w wieloskokowej sieci doraźnej. Wyniki pomiarów umożliwilły określenie m.in. rzeczywistego czasu rekonfiguracji urządzeń, czy opóźnienia transmisji danych. Przedstawiono również badania opracowanej warstwy...

  • Stanowisko do badania adaptacyjnego doboru parametrów interfejsu radiowego sieci ad hoc

    W artykule przedstawiono stanowisko do badania opracowanej metody adaptacyjnej konfiguracji interfejsu radiowego sieci ad hoc. Badania skupiono wokół dynamicznej zmiany przepływności łącza radiowego do komunikacji pomiędzy węzłami w wieloskokowej sieci doraźnej. Wyniki pomiarów umożliwilły określenie m.in. rzeczywistego czasu rekonfiguracji urządzeń, czy opóźnienia transmisji danych. Przedstawiono również badania opracowanej warstwy...

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  • Two-Row ESPAR Antenna with Simple Elevation and Azimuth Beam Switching

    In this letter, we propose a two-row electronically steerable parasitic array radiator (ESPAR) antenna designed for direction of arrival (DoA) estimation in Internet of Things (IoT) applications relying on simple microcontrollers. The antenna is capable of elevation and azimuth beam switching using a simple microcontroller-oriented steering circuit and provides 18 directional radiation patterns, which can be grouped in 3 distinctive...

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  • Badanie i analiza dokładności radiolokalizowania terminali ruchomych w środowisku miejskim w systemie LTE

    Publication

    - Year 2017

    W ramach pracy doktorskiej, przeprowadzono kompleksową analizę i badanie efektywności metody OTDoA, służącej do estymacji położenia terminala ruchomego w sieci LTE. Opracowano algorytm, którego zastosowanie pozwala na zwiększenie dokładności radiolokalizowania poprzez detekcję pierwszej składowej odebranego sygnału zbiorczego z możliwie dużą dokładnością. Algorytm ten opiera się na dynamicznym wyznaczaniu progu detekcji (w zależności...

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  • Tool Wear Monitoring Using Improved Dragonfly Optimization Algorithm and Deep Belief Network

    Publication
    • L. Gertrude David
    • R. Kumar Patra
    • P. Falkowski-Gilski
    • P. Bidare Divakarachari
    • L. J. Antony Marcilin

    - Applied Sciences-Basel - Year 2022

    In recent decades, tool wear monitoring has played a crucial role in the improvement of industrial production quality and efficiency. In the machining process, it is important to predict both tool cost and life, and to reduce the equipment downtime. The conventional methods need enormous quantities of human resources and expert skills to achieve precise tool wear information. To automatically identify the tool wear types, deep...

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

    Publication
    • P. Kwapisiewicz

    - Year 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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  • A Review of Antennas for Indoor Positioning Systems

    Publication

    - International Journal of Antennas and Propagation - Year 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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  • ASYNCHRONICZNE METODY RADIOLOKALIZACYJNE

    Publication

    - Year 2018

    W pracy przedstawiono wybrane problemy lokalizowania obiektów w asynchronicznych sieciach radiowych. W pierwszej kolejności zostały zdefiniowane kryteria jakościowe do oceny efektywności pracy opracowanych metod oraz przedstawiono model symulacyjny, który został użyty do badań. W kolejnych trzech rozdziałach szczegółowo opisano trzy oryginalne asynchroniczne metody radiolokalizacyjne w różnych wariantach. Przeprowadzono analizę...

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  • New First - Path Detector for LTE Positioning Reference Signals

    Publication

    - Year 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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  • Audio-visual surveillance system for application in bank operating room

    An audio-visual surveillance system able to detect, classify and to localize acoustic events in a bank operating room is presented. Algorithms for detection and classification of abnormal acoustic events, such as screams or gunshots are introduced. Two types of detectors are employed to detect impulsive sounds and vocal activity. A Support Vector Machine (SVM) classifier is used to discern between the different classes of acoustic...

  • Processing of acoustical data in a multimodal bank operating room surveillance system

    An automatic surveillance system capable of detecting, classifying and localizing acoustic events in a bank operating room is presented. Algorithms for detection and classification of abnormal acoustic events, such as screams or gunshots are introduced. Two types of detectors are employed to detect impulsive sounds and vocal activity. A Support Vector Machine (SVM) classifier is used to discern between the different classes of...

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  • Comparative testing of numerical models of river ice jams

    Publication
    • C. Rick
    • B. Spyros
    • G. Joe
    • H. Dan
    • S. Yuntong
    • M. Jarrod
    • M. Mike
    • S. Jean-Philippe
    • T. Kolerski
    • H. Toa Shen

    - CANADIAN JOURNAL OF CIVIL ENGINEERING - Year 2011

    Ice processes in general, and ice jams in particular, play a dominant role in the hydrologic regime of Canadian rivers, often causing extreme floods and affecting the life cycle of many aquatic, terrestrial, and avian species. Various numerical models have been developed to help simulate the formation and consequences of these very dynamic and often destructive jam events. To test and compare the performance of existing models,...

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  • Relay-aided Wireless Sensor Network Discovery Algorithm for Dense Industrial IoT utilizing ESPAR Antennas

    Publication

    - IEEE Internet of Things Journal - Year 2021

    Industrial Internet of Things (IIoT) applicationsrequire reliable and efficient wireless communication. Assumingdense Wireless Sensor Networks (WSNs) operating in a harshenvironment, a concept of a Time Division Multiple Access(TDMA) based WSN enriched with Electronically SteerableParasitic Array Radiator (ESPAR) antennas is proposed andexamined in this work. The utilized...

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  • Persistent homology as a new method of the assessment of heart rate variability

    Publication

    - PLOS ONE - Year 2021

    Heart rate variability (hrv) is a physiological phenomenon of the variation in the length of the time interval between consecutive heartbeats. In many cases it could be an indicator of the development of pathological states. The classical approach to the analysis of hrv includes time domain methods and frequency domain methods. However, attempts are still being made to define new and more effective hrv assessment tools. Persistent...

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  • Metodyka wykonywania pomiarów oraz ocena niepewności i błędów pomiaru

    elem każdego ćwiczenia w laboratorium studenckim jest zmierzenie pewnych wielkości, a następnie ob- liczenie na podstawie tych wyników pomiarów wartości wielkości badanej. Rezulta- tem końcowym badań jest nie tylko otrzymany wynik liczbowy. Nie mniej ważne jest dokonanie oceny dokład- ności pomiaru oraz opraco- wanie wniosków końcowych. Warto zadać sobie pytanie: czy to, co zostało zmierzone, ma sens i co z tego wynika?...

  • Buzz-based honeybee colony fingerprint

    Non-intrusive remote monitoring has its applications in a variety of areas. For industrial surveillance case, devices are capable of detecting anomalies that may threaten machine operation. Similarly, agricultural monitoring devices are used to supervise livestock or provide higher yields. Modern IoT devices are often coupled with Machine Learning models, which provide valuable insights into device operation. However, the data...

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