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 20 of 24 for “"DGPS"”.
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Kinematic State Estimation using Multiple DGPS/MEMS-IMU Sensors
… as the commercial MOCAP systems. The developed DGPS/MEMS-IMU multi-receiver fusion MOCAP system was assessed to have global trajectory accuracy of _0:0394m, relative limb position accuracy of _0:006497m. To conclude the research, several recommendations are made to improve the developed MOCAP …
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Calibration system for the Tracking Accuracy Measurement System (TAMS) using differential GPS (dGPS)
… of differential Global Positioning System (dGPS) technology to qualify a 60km range X-band combined Optronic and Radar Tracker System. In essence, a roving GPS receiver, capable of measuring high dynamic movement, is mounted onboard an airplane and records target position as it is tracked by …
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Exactitude et précision de la mesure de superficie de parcelle de culture
… methods: (1) Total Station, (2) GPS (RTK GPS and DGPS) and (3) Topofil and Compass (forest instruments). These instruments are used in the field to confirm the three variance computation formulas. For all instruments used, approximate and observed variances are equivalent. Two exceptions to this …
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Design of an automatic landing system for twin rotor vertical take-off and landing unmanned air vehicle
… of the design revolved around navigation via DGPS data. Three issues were identified as being paramount to the success of the system. First was the need for an algorithm to locate an appropriate intercept point on the intended flight profile after a position error is found after navigation …
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Deep Gaussian Process Surrogates for Computer Experiments
Deep Gaussian processes (DGPs) upgrade ordinary GPs through functional composition, in which intermediate GP layers warp the original inputs, providing flexibility to model non-stationary dynamics. Recent applications in machine learning favor approximate, optimization-based inference for fast …
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Improved Ionospheric Correction for Dual Frequency and Differential GPS Positioning Methods
… of horizontal gradient. In differential GPS (DGPS), the effect of the ionosphere is assumed to be the same for two closely spaced Earth receiving stations (e. g. 10km baseline distance). However, the presence of ionospheric horizontal gradient, especially for receivers in the equatorial and …
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Development of a Mars Exploration Rover for RASC-AL Exploration RoboOps Competition with an Extended Kalman Filter Based Navigation System
… a high-quality dual-antenna, Differential GPS (DGPS) receiver, as well as a low-cost single antenna GPS receiver. The NAS was observed to provide smoother position output, however actual error from the DGPS was only slightly reduced; in the nominal case an improvement of 0.2 meters was observed. …
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Atomic Clock Augmentation For Receivers Using the Global Positioning System
… processing GPS data in differential mode (DGPS). Among the error sources that cause a clock offset are antenna rotation, hardware drifts due to temperature variations, and relativistic effects for GPS receivers on moving platforms. Antenna rotation and temperature effects are addressed and …
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Analysis of microtopography, vegetation, and active-layer thickness using terrestrial LIDAR and kite photography, Barrow, AK
… using differential global positioning system (DGPS) to assess heave and subsidence, has been gathered annually since 2004 and was used to assess the accuracy of the DEMs generated for August 2010. Higher-resolution DEMs did not have higher accuracy compared to the DGPS control points due to …
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Analysis of microtopography, vegetation, and active-layer thickness using terrestrial LIDAR and kite photography, Barrow, AK
… using differential global positioning system (DGPS) to assess heave and subsidence, has been gathered annually since 2004 and was used to assess the accuracy of the DEMs generated for August 2010. Higher-resolution DEMs did not have higher accuracy compared to the DGPS control points due to …
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The characterisation of synoptic circulation patterns in Saldanha Bay
… use of a Differential Global Positioning System (DGPS).
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Quantifying overwash flux in barrier systems : an example from Martha’s Vineyard, Massachusetts, USA
… ground penetrating radar, high resolution dGPS, and LiDAR data. From these data, the volumes of the deposits were determined and range from 2.1—2.4 x 104 m3. Two overwashes occurred during Hurricane Bob in 1991. The water levels produced by this storm have a return interval of ~28 years, …
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Quantifying overwash flux in barrier systems : an example from Martha's Vineyard, Massachusetts, USA
… ground penetrating radar, high resolution dGPS, and LiDAR data. From these data, the volumes of the deposits were determined and range from 2.1-2.4 x 10⁴ m³. Two overwashes occurred during Hurricane Bob in 1991. The water levels produced by this storm have a return interval of ~28 years, …
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Modeling Truck Motion along Grade Sections
… profiles generated by expensive carrier-phase DGPS units ($30,000 per unit including the base station). The results of this study demonstrate that the use of data smoothing and stacking techniques with the WAAS data provides grade estimates that are accurate within 10% of those generated by the …
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The Development of a Hydrological Buffer Zone Strategy for Designating the Mesotope Protection Zone of Raised Mire Systems
… use of differential Global Positioning Systems (dGPS) for accurate and rapid surveying of transects across a suite of UK raised mires. It may be that developments in dGPS and remote sensing methods such as LiDAR will offer opportunities for future development of this approach. An early product of …
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GPS positioning improvement by mitigating the ionospheric horizontal gradient
… have been done to see the effect of the DGPS positioning such as baselines length (short and long), low and high solar activity, range measurement from three and eight satellites and two different duration times (one and three hours). Some improvements can be seen after the corrections …
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Comportamento morfológico e sedimentológico do litoral de Itaipuaçú (Maricá) e Piratininga (Niterói), RJ, nas últimas três décadas
… the sand barrier crest and washover fans with DGPS; (3) analysis of the aero photographies and satellite images; (4) comparing new data to dataset published by several authors between the decades of 1970 and 2003. The results show that the Itaipuaçú beach presents very dynamic profiles at the …
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The Dynamics of Coarse Sediment Transfer in an Upland Bedrock River
… using terrestrial laser scanning and repeat dGPS surveys and continuous flow monitoring. This has enabled sediment transport dynamics to be related to the hydraulic conditions throughout the reach. Differences between channel types have been conceptualised using the continuum of the ‘fluvial …
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Utilización de GPS diferencial e inercial para operaciones de aproximación final y aterrizaje
La utilización de GPS Diferencial (DGPS) es especialmente atractiva para la aviación ya que posibilita una navegación satelitaria para todas las fases de vuelo, desde el despegue hasta el aterrizaje, con bajo coste y alta disponibilidad. Siendo éste el objetivo, existen algunas dificultades …
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Relative Accuracy and Precision of Differentially Corrected GPS on a Moving Vehicle
Differential corrections provide a method to improve the real-time accuracy and precision of GPS, but there are several sources of differential corrections and each have an associated accuracy and precision. In dynamic applications, the speed and heading of the rover may also have an effect on the …
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