Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"dilution of precision"”.
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Peer-to-peer wireless ultrawide-band localization of fast-moving entities
… localization techniques such that a group of mobile nodes can continuously track its topology, without relying on external infrastructure. Ultrawide-band (UWB) radios worn by each node (humans in our case) perform time-of-flight (TOF) measurements between different node pairs, ultimately …
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Adaptive modeling of GPS receiver clock for integrity monitoring during precision approaches
… navigation aids as the primary means of aircraft precision approaches. Stringent requirements on the integrity of the system have caused significant delays and raised questions about the adopted approach to integrity monitoring. The system architecture must be capable of detecting when …
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Problems in GPS Accuracy
<p>Improving and predicting the accuracy of positioning estimates derived from the global positioning system (GPS) continues to be a problem of great interest. Dependable and accurate positioning is especially important for navigation applications such as the landing of commercial aircraft. This …
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Atomic Clock Augmentation For Receivers Using the Global Positioning System
… solve for three dimensional position and clock offset. If the receiver clock could be synchronized with GPS time, the extra range measurement would not be necessary. To achieve this synchronization, a stable frequency reference must be incorporated into the GPS user set. This concept is known as …
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Study into the use of the GNSS for maritime structure analysis
Certain civilian uses of the Global Positioning System (GPS) now demand levels of precision exceeding the original military specifications for the system. For example, at present, GPS is used in surveying, navigation and monitoring applications. Although GPS has been used previously to monitor the …
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Target localization in MIMO radar systems
… waveforms and engage in joint processing of the received echoes from the target. MIMO radar has been receiving increasing attention in recent years from researchers, practitioners, and funding agencies. Elements of MIMO radar have the ability to transmit diverse waveforms ranging from …
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Received Signal Strength-Based Localization of Non-Collaborative Emitters in the Presence of Correlated Shadowing
… a promising solution for estimating the position of a non-collaborative emitter using a network of collaborative sensors. This paper examines RSS-based localization and differential RSS (DRSS) localization in the presence of correlated shadowing with no knowledge of the emitter's reference power. …
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Measurement consensus metric aided lidar localization and mapping
… (SLAM), probability distribution approximations of point clouds, such as the Normal Distribution Transform (NDT), can be leveraged for compact map storage and fast lookup. Augmentation of these techniques with a measurement consensus-based estimate of feature reliability can make them robust to …
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Optimizing range aware localization in wireless sensor networks (WSNs)
The adoption of wireless sensor networks (WSNs) in numerous emerging applications have prevailed us to realize that smart living is no longer an imagination, it already exists. In emerging applications, localization is an essential function so that all the sensed information can be responded …
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Computer Vision-assisted Battery-free RFID Systems for Object Recognition, Localization and Orientation
… (RFID) is a promising technique in Internet of Things (IoT) applications that use wireless signals to identify a physical object from its attached RFID tag. Compared to the existing barcode identification systems, RFID can still work in the non-line-of-sight (NLOS) scenarios that some …
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Improved Ionospheric Correction for Dual Frequency and Differential GPS Positioning Methods
… that can give a very accurate description of the real ionospheric variation; latitudinally,longitudinally and altitudinally. An important advantage of this model is that the electron density and all its spatial derivatives are continuous as required for high accuracy in a ray tracing …
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The foraging ecology of banded mongooses (Mungos mungo): Epidemiological and human-wildlife conflict implications
… infects mongooses through lesions in the skin (often the planum nasale) from an environmental reservoir. To understand the epidemiology of the yearly and highly seasonal outbreaks of M. mungi in this population of banded mongooses, researchers need to understand what factors influence banded …
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Highly Accurate Ultrasonic Positioning and Tracking Systems
Localization is the process of determining the current location of a target(s) within given coordinates using a location system. The localization process has two main phases: firstly, the measurement phase, that establishes a relationship in terms of the distance and/or angle between the targets(s) …
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The use of GPS technology to quantify the game demands of elite youth soccer: implications for training design.
The transition from academy to the professional level is one of the pivotal key stages in the development of elite professional soccer players and our understanding of this process is incomplete (Mills et al. 2012). A comprehensive detailed assessment of elite youth players match performance is …