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    Wyświetlanie 1-2 z 2
    Tytuł:
    Sensitivity analysis of multiple fault test and reliability measures in integrated GPS/INS systems
    Autorzy:
    Almagbile, A.
    Wang, J.
    Ding, W.
    Knight, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/130262.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geodetów Polskich
    Tematy:
    GPS/INS integration
    Kalman filtering
    multiple faults
    reliability measures
    sensitivity analysis
    integracja systemów GPS/INS
    filtracja Kalmana
    uszkodzenia wielokrotne
    miary niezawodności
    analiza wrażliwościowa
    Opis:
    Based on Kalman filtering, multi-sensor navigation systems, such as the integrated GPS/INS system, are widely accepted to enhance the navigation solution for various applications. However, such integrated systems do not always provide robust and stable navigation solutions due to unmodelled measurements and system dynamic errors, such as faults that degrade the performance of Kalman filtering for such integration. Single fault detection methods based on least squares (snapshot) method were investigated extensively in the literature and found effective to detect the fault at either sensor level or integration level. However, the system might be contaminated by multiple faults simultaneously. Thus, there is an increased likelyhood that some of the faults may not be detected and identified correctly. This will degrade the accuracy of positioning. In this paper multiple fault test and reliability measures based on a snapshot method were implemented in both the measurement model and the predicted states model for use in a GPS/INS integration system. The influences of the correlation coefficients between fault test statistics on the performances of the faults test and reliability measures were also investigated. The results indicate that the multiple fault test and reliability measures can perform more effectively in the measurement model than the predicted states model due to weak geometric strength within the predicted states model.
    Źródło:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2011, 22; 25-37
    2083-2214
    2391-9477
    Pojawia się w:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurable realistic image-based 3D mapping
    Autorzy:
    Liu, W.
    Wang, J.
    Wang, J. J.
    Ding, W.
    Almagbile, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/130115.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geodetów Polskich
    Tematy:
    three-dimensional map
    multi-sensor
    measurable image
    virtual reality
    mapa trójwymiarowa
    multisensor
    rzeczywistość
    Opis:
    Maps with 3D visual models are becoming a remarkable feature of 3D map services. High-resolution image data is obtained for the construction of 3D visualized models.The3D map not only provides the capabilities of 3D measurements and knowledge mining, but also provides the virtual experienceof places of interest, such as demonstrated in the Google Earth. Applications of 3D maps are expanding into the areas of architecture, property management, and urban environment monitoring. However, the reconstruction of high quality 3D models is time consuming, and requires robust hardware and powerful software to handle the enormous amount of data. This is especially for automatic implementation of 3D models and the representation of complicated surfacesthat still need improvements with in the visualisation techniques. The shortcoming of 3D model-based maps is the limitation of detailed coverage since a user can only view and measure objects that are already modelled in the virtual environment. This paper proposes and demonstrates a 3D map concept that is realistic and image-based, that enables geometric measurements and geo-location services. Additionally, image-based 3D maps provide more detailed information of the real world than 3D model-based maps. The image-based 3D maps use geo-referenced stereo images or panoramic images. The geometric relationships between objects in the images can be resolved from the geometric model of stereo images. The panoramic function makes 3D maps more interactive with users but also creates an interesting immersive circumstance. Actually, unmeasurable image-based 3D maps already exist, such as Google street view, but only provide virtual experiences in terms of photos. The topographic and terrain attributes, such as shapes and heights though are omitted. This paper also discusses the potential for using a low cost land Mobile Mapping System (MMS) to implement realistic image 3D mapping, and evaluates the positioning accuracy that a measureable realistic image-based (MRI) system can produce. The major contribution here is the implementation of measurable images on 3D maps to obtain various measurements from real scenes.
    Źródło:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2011, 22; 297-310
    2083-2214
    2391-9477
    Pojawia się w:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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