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  • 1
    Series available for loan
    Series available for loan
    Hannover : Fachrichtung Geodäsie und Geoinformatik, Univ. Hannover
    Associated volumes
    Call number: S 99.0139(370)
    In: Wissenschaftliche Arbeiten der Fachrichtung Geodäsie und Geoinformatik der Leibniz Universität Hannover
    Type of Medium: Series available for loan
    Pages: x, 126 Seiten , Illustrationen, Diagramme
    ISBN: 978-3-7696-5286-4 , 9783769652864
    ISSN: 0174-1454
    Series Statement: Wissenschaftliche Arbeiten der Fachrichtung Geodäsie und Geoinformatik der Leibniz Universität Hannover Nr. 370
    Language: English
    Note: Contents 1 Introduction 1.1 Motivation 1.2 Objective & Research Questions 1.3 Outline of the Thesis 2 Related Work and Theory 2.1 GNSS Positioning 2.1.1 GNSS Constellations 2.1.2 Position Estimation 2.1.3 Measurement Errors in GPS Measurements 2.2 Reliability 2.3 Integrity 2.3.1 Conventional RAIM 2.3.2 Advanced RAIM 2.3.3 Augmentation Systems 2.3.4 Derivation of Conventional RAIM 2.3.5 Protection Level 2.4 Interval Mathematics 2.4.1 Basic Interval Mathematical Operations 2.4.2 Interval Vectors and Matrices 2.4.3 Interval Functions 2.4.4 Set Inversion via Interval Analysis 2.4.5 Contractors 2.4.6 Application of Interval Analysis to Navigation 2.5 Determination of Observation Interval Bounds 2.5.1 Probabilistic Approaches with a Priori Integrity Risk 2.5.2 Sensitivity Analysis of the Measurement Correction 2.5.2.1 Concept 2.5.2.2 Klobuchar Ionospheric Model 2.5.2.3 Saastamoinen Tropospheric Model 2.5.3 Expert Knowledge and Desired Size of the Bounding Zone 3 Integrity Approaches Based on Interval Mathematics and Set Theory 3.1 Interval Extension of Least-Squares Adjustment 3.2 Set Inversion Via Interval Analysis 3.3 Linear Programming Bounding Method 3.4 Developed Method Based on Primal-Dual Poly tope and Intervals 3.4.1 Polytopes and Zonotopes 3.4.2 Formulation and Methodology 3.4.3 Interpretation of Bounding Zones and Related Consistency Measures 3.4.4 Minimum Detectable Bias Definition 3.4.5 Integrity Measures Via Zonotopes and Polytopes 4 Performance Analysis of the Developed Methods by Monte Carlo Simulations 4.1 Introduction 4.2 Characterization of a Nominal Behavior 4.3 Proposal to Select the Critical Value of the Polytope Tests 4.4 Impact of Biases 4.4.1 Introductory Example 4.4.2 Impact of Different Biased Satellites and Observation Interval Bounds 4.4.3 Impact of Different Biased Satellites and Satellite Geometry 4.5 Analysis of the Polytope Global and Local Tests 4.5.1 General Proceeding 4.5.2 Critical Detection Scenarios - Correlated Satellites 4.5.3 Critical Detection Scenarios - Bad Geometry 4.6 Probabilistic Test Statistic Results 4.6.1 Results of Probabilistic Test Statistics 4.7 Comparison Between Probabilistic Tests and Polytopal Test 4.7.1 Good Satellite Geometry 4.7.2 Bad Satellite Geometry 4.8 Analysis of Protection Levels 4.8.1 Zonotopal Horizontal and Vertical Protection Levels 4.8.2 Statistical Based Horizontal and Vertical Protection Level 5 Real Data Analysis 5.1 Introduction 5.2 Positioning Analysis 5.2.1 Results from Scenario 1 - Urban Area 5.2.2 Results from Scenario 2 - Semi-Urban Area 5.3 Fault Detection and Exclusion 5.4 Minimum Detectable Bias 5.5 Protection Level 6 Conclusions and Outlook Bibliography Acknowledgments Curriculum Vitae
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Publication Date: 2018-07-23
    Description: Global Navigation Satellite Systems (GNSS) deliver absolute position and velocity, as well as time information (P, V, T). However, in urban areas, the GNSS navigation performance is restricted due to signal obstructions and multipath. This is especially true for applications dealing with highly automatic or even autonomous driving. Subsequently, multi-sensor platforms including laser scanners and cameras, as well as map data are used to enhance the navigation performance, namely in accuracy, integrity, continuity and availability. Although well-established procedures for integrity monitoring exist for aircraft navigation, for sensors and fusion algorithms used in automotive navigation, these concepts are still lacking. The research training group i.c.sens, integrity and collaboration in dynamic sensor networks, aims to fill this gap and to contribute to relevant topics. This includes the definition of alternative integrity concepts for space and time based on set theory and interval mathematics, establishing new types of maps that report on the trustworthiness of the represented information, as well as taking advantage of collaboration by improved filters incorporating person and object tracking. In this paper, we describe our approach and summarize the preliminary results.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
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