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    Wyświetlanie 1-8 z 8
    Tytuł:
    Availability, reliability and continuity in navigation and hydrography - terminology discussion
    Autorzy:
    Specht, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/320472.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    nawigacja
    hydrografia
    żegluga
    navigation
    hydrography
    Opis:
    The problem of positioning for maritime navigation and hydrography purposes, seen only from the categories of the position error point of view, seems to have been solved on a global scale. In such a situation characteristics of radio-navigation systems such as: availability, reliability, continuity, integrity and ambiguity of position, which are equally important but often neglected, turn out to be essential. One may risk a claim that integrity and characteristics of reliability theorem origin: availability, reliability, continuity, treated on various levels of structures of radionavigation systems, now seem to be one of the main areas of research. This article presents an analysis of meanings like: availability, reliability and continuity based on navigation literature in the last twenty years. Its changeable nature and ambiguous definition of continuity have been discussed here.
    Źródło:
    Annual of Navigation; 2002, 4; 71-78
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Availability, reliability and continuity model of differential GPS transmission
    Autorzy:
    Specht, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/320585.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    nawigacja satelitarna
    satelitarne systemy nawigacyjne
    GPS
    satellite navigation systems
    Opis:
    [from "Introduction"] The dissertation is divided into four chapters: Chapter I. "Terminological synthesis of concepts: availability, reliability and continuity in literature on navigation" - covers the study of literature in the field of navigation with regard to the three concepts discussed. They will be characterized with respect to both their nature, and methods of determination navigational purposes. As a result of the analysis, drawn will be conclusions related to the existing differences in perception of the terms, narrowing down of their meaning in navigation, as well as constraints of the models recommended. Chapter II. "General model of the availability, reliability and continuity" - here the definition of navigational structure will be constructed. This definition is indispensable for the process of system modeling. The mathematical model of alternative process with restoration will be worked out, based on the mathematical description of navigational systems’ states. As a result, mathematical relations of availability, reliability and continuity will be formulated, describing them on a general level. The same model will enable the transposition to time-related formulas, typical of a number navigation processes, i.e. processes - where distributions of lifetimes and times of failures are expressed by exponential equations. Chapter III. "Classical differential GPS systems"- the main thesis will be considered here and include structural models of differential DGPS transmission, providing, in this way, for making a separate individual navigational structure - differential GPS transmission. Consequently, models and measures of reliability, availability and continuity will be proposed for transmission of the RTCM messages (type 1 or 9-3) commonly used in navigation. Chapter IV. "Differential GPS system network" - presents the validation method of DGPS systems in the areas where multiple coverage of several radiobeacons and reference stations exists. An analogous method of modelling as in the classic systems is proposed. A general validation of transmission methods for differential GPS will also be proposed in this chapter. The issues considered in this dissertation, will exemplify a group of single element models - GPS telemetric transmission - within the complex structure of differential GPS. We can assume that a new scientific area will be opened for future deliberations in the fields related to: 1. Optimisation of decision making process when deploying maritime reference stations (DGPS) or land based (permanent GPS/RTK), taking into account: user reliability features, minimum requirements for the basin (area), maximization of task effectiveness and many others. 2. Advantages of multistation system nets in the aspect of position accuracy and operation reliability, also other typical features influencing exploitation. The mathematical model proposed in this dissertation, fills the gap concerning methodology used to determine the magnitude of reliability, continuity and transmission availability in differential GPS systems on surveying level. Thus, more effective way of use in navigation has been provided. General and particular theory introduced to describe navigation systems by means of reliability characteristics enables theoretical considerations over individual elements and easy integration into more complex structures.
    Źródło:
    Annual of Navigation; 2003, 5; 1-84
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer simulator of GNSS measurements
    Autorzy:
    Nowak, A.
    Specht, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/320456.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    GNSS
    symulator
    simulator
    Opis:
    This paper presents computer application which enables to simulate GNSS measurements. Some theoretical assumptions concerned presented simulator and its abilities and limitations were described, too. The paper includes also some simulation examples of satellite measurements, positioning and influences of terrain obstructions on RAIM Availability and Approximate Radial-Error Protected (ARP).
    Źródło:
    Annual of Navigation; 2007, 12; 65-74
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Snapshot RAIM algorithms availability in urban areas
    Autorzy:
    Nowak, A.
    Specht, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/320887.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    RAIM
    satelitarne systemy nawigacyjne
    satellite navigation systems
    Opis:
    This paper presents some theoretical considerations concerned usage of Snapshot RAIM algorithms in city navigation. Influence of urban areas on RAIM Availability and Approximate Radial-Error Protected (ARP) is taken into consideration. Some results of numerical experiments are presented, too.
    Źródło:
    Annual of Navigation; 2006, 11; 73-88
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planning GPS Measurements of a Linear Object for a Specififed Time Interval
    Autorzy:
    Specht, C.
    Skóra, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/320923.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    GPS
    almanac
    position accuracy
    GNSS measurements planning
    Opis:
    The previous measurement campaigns planning used in geodesy is conducted exclusively for individual points. For the natural process aimed at the adoption of the introduction of the planning (prediction of constellation state) in navigation, which is characterized by the movement, one should adopt measurement campaigns planning for linear objects. In contrast to the existing planning solutions, focused on point presentation of the state of the constellation of navigation system, the author of this article rearranges the proposal of determination of geometrical factors, and their summation. In the presented simulation, one has specified the route of passing at certain times and it was assumed that the receiver will move with variable motion. One has defined the geometric ratios (PDOP), which allow to distinguish the results corresponding to the adopted criteria for the measurement of linear object to be conducted with the best possible accuracy.
    Dotychczasowe planowanie kampanii pomiarowych w geodezji odbywa się wyłącznie dla pojedynczych punktów. Za naturalny proces ukierunkowany na wprowadzenie planowania (predykcji stanu konstelacji) w nawigacji, którą cechuje ruch, należy przyjąć planowanie kampanii pomiarowych dla obiektów liniowych. W przeciwieństwie do dotychczasowych rozwiązań, skupionych na punktowym przedstawieniu stanu konstelacji systemu nawigacyjnego, autorzy przestawiają propozycję określania współczynników geometrycznych, a następnie ich sumowania. W symulacji określono trasę przejazdu w konkretnych godzinach i przyjęto, że odbiornik będzie poruszać się ruchem zmiennym. Określono też współczynniki geometryczne (PDOP), które pozwalają wyróżnić odpowiadające przyjętym kryteriom wyniki, by pomiar obiektu liniowego odbył się z jak największą dokładnością.
    Źródło:
    Annual of Navigation; 2017, 24; 75-88
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analytical method of the DGPS radiobeacon signal availability prediction
    Autorzy:
    Felski, A.
    Grabski, F.
    Specht, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/320791.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    system radionawigacyjny
    radionavigation system
    Opis:
    The most popular method of determining availability of DGPS as a complex radionavigation system is the ratio of Mean Time Between Failures to total (i.e. sum MTBF and Mean Time To Repair). This simple method can be used only as a post processed method. The analytical method of availability prediction of the DGPS radio signals transmitted by the Marine Radiobeacons is discussed in the paper. Authors propose to determine it on the basis of such information like: type of RTCM message, signal to noise ratio, rate of corrections etc. To model the availability zones of each DGPS Reference Station these calculations can be used. The short version of this article was presented on the GNSS’99 Conference in Genoa. Now, the full version is presented. Some results of the implementation in practice for Polish DGPS Reference Station Rozewie are added.
    Źródło:
    Annual of Navigation; 1999, 1; 29-39
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finding deformation of the stright rail track by GNSS measurements
    Autorzy:
    Koc, W.
    Chrostowski, P.
    Specht, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/320893.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    railway track
    geometrical layout
    satellite surveying GPS
    ASG-EUPOS network
    coordinates determining
    error correction
    Opis:
    In 2009, at the Gdansk University of Technology and Polish Naval Academy there has been carried out, for the first time, continuous satellite surveying of railway track by the use of the relative phase method based on the Polish Active Geodetic Network ASG-EUPOS and RTK (GPRS) real time service - NAVGEO. The analysis indicated strong connection between location of GNSS receiver and accuracy of position determination, the horizon obstruction deteriorated accuracy and impacts terrain obstructions, the precise GPS planning process on the position solution. It can be stated that implemented measuring technique opens a whole new perspective on applied research. As proved, it enables very precise determination of basic data definition for railway line modernization design. On-going research works focuses on the GNSS multi-receivers platform evaluation for projecting and stocktaking. Analyses also focused on the values of deviations of transverse position XTE (Cross Track Error). In order to eliminate the influence of random measurement errors and to obtain the coordinates representing the actual shape of the track, the XTE variable was performed by different statistical and regression methods (least square method - LSM, weighted least squares - WLS, Linear Chebyshev low-pass filtering and fast Fourier transform). The paper presents the result of trial analyses realized on the newly constructed (rectilinear) and old-used up railway lines. The authors were searching the methods for filtering random measurement GNSS errors different from instantaneous shape deformations of the straight rail track.
    Źródło:
    Annual of Navigation; 2012, No. 19, part 1; 91-104
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EGNOS - accuracy performance in Poland
    Autorzy:
    Mięsikowski, M.
    Nowak, A.
    Oszczak, B.
    Specht, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/320885.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    dokładność systemów nawigacyjnych
    EGNOS
    accuracy of navigation systems
    Opis:
    EGNOS - the first European satellite navigation system is a join project of the European Space Agency, Eurocontrol, European Commission and represents the fist step to towards Galileo - autonomous navigation satellite system of the 2nd generation (GNSS-2). The system Operational Readiness Review (ORR), took place in June 2005 and resumed of more than eight years of studies, works, leaded by ESA and an industrial consortium with Alcatel Space as the Prime Contractor. The Initial Operations Phase has therefore started in July 2005 as an effect of successful negotiations between ESA and European Satellite Services Provider. During the last years many different test, trials and measurement campaigns have been done in positioning, navigation, time services and other application for improving different characteristics of EGNOS [4, 5]. Some of them were also realised in Poland [1, 2] and observed accuracy confirm high system performances. Poland is at the edge of the system coverage then the system disturbances could be more probable than in the central part of the Europe. Presented paper reports final results of the, long-term static measuring campaigns, which were done before the EGNOS System Test Bed (ESTB) ending. Two-week accuracy analyses were done and the position error statistic distributions of system were also compared with the classical DGPS based on LF/MF reference station.
    Źródło:
    Annual of Navigation; 2006, 11; 63-72
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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