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    Wyświetlanie 1-6 z 6
    Tytuł:
    Bio Mapping for Purposes of City Management - Practical Reflections
    Autorzy:
    Szołtysek, Jacek
    Twaróg, Sebastian
    Powiązania:
    https://bibliotekanauki.pl/articles/522266.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Global Position System (GPS)
    Miasto
    Zarządzanie miastem
    City
    City management
    Opis:
    The article offers information on the failing of bio mapping as a tool for city management. It informs that city managers consider the bio mapping tool as imperfect and unreliable for determining particular actions. It describes that preparation stage involves selection and training of the volunteers, and advises to be equipped with map for a walking journey within designated area and carry devices like Galvanic Skin Response (GSR) and Global Positioning System (GPS).
    Źródło:
    Journal of Economics and Management; 2013, 11; 113-123
    1732-1948
    Pojawia się w:
    Journal of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Business Profile Shaping and the Logistics Information Systems of 2PL, 3PL, 4PL Operators
    Autorzy:
    Hanus, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/522072.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Global Position System (GPS)
    Hurtownie danych
    Logistyka
    Logistyka w gospodarce
    Obsługa klienta
    Oprogramowanie komputerowe
    Usługi informacyjne
    Zarządzanie
    Computer software
    Customer service
    Data warehouse
    Information services
    Logistic in business
    Logistics
    Management
    Opis:
    The article offers information on a research related to aspects of business development and logistics information system of operators including 2PL, 3PL and 4PL conducted in September-November 2011. Topics of discussion included were the use operators in inventory and logistics management, customer service and warehousing. It also discusses the use of information technology tools including mobile phone network and transportation management by an integrated Global Positioning Systems (GPS).
    Źródło:
    Journal of Economics and Management; 2013, 12; 5-21
    1732-1948
    Pojawia się w:
    Journal of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nominal and Real Accuracy of the GPS Position Indicated by Different Maritime Receivers in Different Modes
    Autorzy:
    Januszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/117133.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    Global Positioning System GPS
    Navigational System
    Navigational System Receiver
    Accuracy of Position
    GPS Receiver
    GPS Position Accuracy
    Dilution of Precision (DOP)
    Opis:
    Nowadays on the ship’s bridge two or even more GPS receivers are installed. As in the major cases the coordinates of the position obtained from these receivers differ the following questions can be posed – what is the cause of this divergence, which receiver in the first must be taken into account etc. Based on information published in annual GPS and GNSS receiver survey it was estimated the percentage of GPS receivers designed for marine and/or navigation users. The measurements of GPS position based on the four different stationary GPS receivers were realized in the laboratory of Gdynia Maritime University in Poland in the summer 2012. The coordinates of the position of all these receivers were registered at the same time. The measurements in mode 3D were made for different input data, the same for all receivers. The distances between the individual unit’s antenna were considered also. Next measurements in mode 3D also were realized on two ships in different European ports. Additional measurements were made in mode 2D with three receivers for different their’s antenna heights. The results showed that the GPS position accuracy depends on the type of the receiver and its technical parameters particularly.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 11-19
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental studies on the relationship between HDOP and position error in the GPS system
    Autorzy:
    Specht, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2052120.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Global Positioning System
    GPS
    Horizontal Dilution of Precision
    HDOP
    position error
    Opis:
    2D position error in the Global Positioning System GPS depends on the horizontal dilution of precision (HDOP) and User Equivalent Range Error UERE. The non-dimensional HDOP coeffcient, determining the influence of satellite distribution on the positioning accuracy, can be calculated exactly for a given moment in time. However, the UERE value is a magnitude variable in time, especially due to errors in radio propagation (ionosphere and troposphere effects) and it cannot be precisely predicted. The variability of the UERE causes the actual measurements (despite an exact theoretical mathematical correlation between the HDOP value and the position error) to indicate that position errors differ for the same HDOP value. The aim of this article is to determine the relation between the GPS position error and the HDOP value. It is possible only statistically, based on an analysis of an exceptionally large measurement sample. To this end, measurement results of a 10-day GPS measurement campaign (900,000 fixes) have been used. For HDOP values (in the range of 0.6-1.8), position errors were recorded and analysed to determine the statistical distribution of GPS position errors corresponding to various HDOP values. The experimental study and statistical analyses showed that the most common HDOP values in the GPS system are magnitudes of: 0.7 ( = 0.353) and 0.8 ( = 0.432). Only 2.77% of fixes indicated an HDOP value larger than 1. Moreover, 95% of measurements featured a geometric coeffcient of 0.973 - this is why it can be assumed that in optimal conditions (without local terrain obstacles), the GPS system is capable of providing values of HDOP ≤ 1, with a probability greater than 95% (2). Obtaining a low HDOP value, which results in a low GPS position error value, calls for providing a high mean number of satellites (12 or more) and low variability in their numer.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 1; 17-36
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling GPS positioning performance in Northwest Passage during extreme space weather conditions
    Autorzy:
    Špoljar, D.
    Jukić, O.
    Sikirica, N.
    Lenac, K.
    Filjar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841553.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Positioning System
    Northwest Passage
    Global Navigation Satellite System
    Software Defined Radio (SDR)
    GNSS SDR Receiver
    GPS Position
    Opis:
    New shipping routes are emerging as a result of iceberg melting in polar regions, allowing for more efficient transport of people and goods. Opening of the Northwest Passage, the maritime route connecting Pacific Ocean with Atlantic Ocean through Arctic region, is considered such a development. The increasing transport exploitation of the Northwest Passage requires the quality assessment of maritime navigation aids for compliance with the established requirements. Here we contribute to the subject with addressing the polar commercial-grade GPS positioning performance in the Northwest Passage in the extreme positioning environment conditions during the massive 2003 space weather storm, a space weather event similar to the Carrington Storm of 1859, the largest space weather event recorded. The GPS positioning environment in the Northwest Passage during the Carrington-like storm in 2003 was reconstructed through the GNSS SDR receiver-post processing of the experimental GPS observations. The raw GPS dual-frequency pseudoranges and navigation messages were collected at the International GNSS Service (IGS) reference station at Ulukhaktok, Victoria Island, Canada. Pseudorange processing and GPS position estimation were performed in three scenarios of pre-mitigation of the ionospheric effects, known as the single major contributor GPS positioning error: (i) no corrections applied, (ii) Klobuchar-based corrected GPS positioning, and (iii) dual-frequency corrected GPS positioning. Resulting GPS positioning error vectors were derived as positioning error residuals from the known reference station position. Statistical properties of the northing, easting, and vertical components of the GPS positioning error vector were analyzed with a software developed in the R environment for statistical computing to select suitable methods for the GPS positioning error prediction model development. The analysis also identified the most suitable theoretical fit for experimental statistical distributions to assist the model development. Finally, two competitive GPS positioning error prediction models were developed, based on the exponential smoothing (reference) and the generalized regression neural networks (GRNN) (alternative) methods. Their properties were assessed to recommend their use as mitigation methods for adverse massive space weather effects in polar regions.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 165-169
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Effect of Urban Development on the Accuracy of the GPS/EGNOS System
    Autorzy:
    Bober, R.
    Szewczuk, T.
    Wolski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/116270.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    Global Positioning System GPS
    EGNOS
    Effect of Urban Development
    Accuracy
    Accuracy of Position
    positioning system
    Port of Szczecin
    Opis:
    This article presents the results of research into the accuracy of position determination by a GPS/EGNOS system in a densely built-up residential area. These results are compared with the relevant results obtained for a position in an open area.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 3; 235-238
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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