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    Wyświetlanie 1-4 z 4
    Tytuł:
    Influence of human body on Radio Signal Strength Indicator readings in indoor positioning systems
    Autorzy:
    Rapiński, J.
    Zinkiewicz, D.
    Stanislawek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/298062.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    Radio Signal Strength Indicator
    fingerprint
    indoor positioning
    Opis:
    In this paper the basic assumptions of a Radio Signal Strength Indicator - based fingerprint and the influence of human body on the results are presented. The main focus is put on the influence of the obstruction of line-of-sight between access point and transceiver by a human body. This issue must be corrected in order to gain more accurate and reliable results of the positioning. The mathematical model for correction of this issue is proposed along with some examples. The examples are based on the real measurements made by authors. Presented correction formula allows to minimize the influence of the user - access point direction on the results obtained during fingerprint creation and positioning.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(2); 117-127
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Short-term positioning accuracy based on mems sensors for smart city solutions
    Autorzy:
    Grzechca, Damian
    Paszek, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/220713.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electro-mechanical system
    received signal strength indicator
    positioning
    filtering
    Opis:
    The paper presents a method of obtaining short-term positioning accuracy based on micro electro-mechanical system (MEMS) sensors and analysis of the results. A high-accuracy and fast-positioning algorithm must be included due to the high risk of accidents in cities in the future, especially when autonomous objects are taken into account. High-level positioning systems should consider a number of sub-systems such as global positioning system (GPS), CCTV – video analysis, a system based on analysis of signal strength of access points (AP), etc. Short-term positioning means that there are other locating systems with a sufficiently high degree of accuracy based on, e.g. a video camera, but the located object can disappear when it is hidden by other objects, e.g. people, things, shelves etc. In such a case, MEMS sensors can be employed as a positioning system. The paper examines typical movement profiles of a radio-controlled (RC) model and fundamental filtering methods in respect of position accuracy. The authors evaluate the complexity and delay of the filter and the accuracy of the positioning in respect of the current speed and phase of movement (positive acceleration, constant) of the object. It is necessary to know whether and how the length of the filter changes the position accuracy. It has been shown that the use of fundamental filters, which provide solutions in a short time, enables to locate objects with a small error in a limited time.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 1; 95-107
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Dual-Band Single-Feed Switched Beam Antenna for WLAN
    Autorzy:
    Chaipanya, P.
    Rattanakriengkai, P.
    Potup, P.
    Lapourailers, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/963885.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dual band
    single-feed
    switched-beam antenna
    short circuit
    signal strength
    Opis:
    This article presents the dual-band of a single patch antenna that can operate at a frequency of 2.47 to 5.04 GHz, which is available in WLANs (IEEE 802.11). The beam pattern of the antenna can be switched by changing the position of shorted-circuit points at each edge of the antenna. The advantage of the proposed antenna is that it is a simple structure which is small in size, weighs little and has an easily adjustable beam. In addition, the antenna is tested under real circumstances using the existing WLAN infrastructure. The results confirm that the signal strength can be improved when the proposed switched beam antenna is utilized.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 4; 405-408
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PCA Based Components Selection Criteria for Computationally Efficient Physical Layer Key Generation (PLKG) System
    Autorzy:
    Sarsodia, Tapesh
    Bhatt, Uma Rathore
    Upadhyay, Raksha
    Bhat, Vijay
    Powiązania:
    https://bibliotekanauki.pl/articles/27311925.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    wireless networks
    received signal strength
    principal component analysis
    physical layer key generation
    Mean
    Histfit
    Opis:
    Data security is one of the prime concerns in wireless networks. PLKG has been emerging as an attractive alternative to traditional cryptographic techniques. PLKG is more computationally efficient than cryptography. Moreover, PLKG using Principal component analysis (PCA) as pre-processing may further save computations. This paper proposes three mechanisms to select components of PCA which are based on Information content, Mean and Histfit. Bit Disagreement Rate (BDR) is compared for each mechanism. Histfit based method is found to be best. Since only two components are supposed to be processed for key generation, it is computationally efficient/ power efficient too.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 2; 361--369
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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