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 66 for “"Error Sources"”.
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Robust randomized trajectory planning for satellite attitude tracking control
… executable plans that are robust to known error sources when supplied with an estimate of the initial state, the goal, the predicted locations of obstacles, and bounds on error sources affecting the execution of a planned trajectory. The planning function presented in this thesis extends …
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Using Random Sampling Consensus (RANSAC) to Detect Errors in Global Navigation Satellite Systems (GNSS) Signals and Data
… carrier phase (TDCP), provide for error reduction. The random sample consensus (RANSAC) method allows for the smoothing of data, even when there are a lot of gross errors present in the data set. The residuals from RANSAC and TDCP were studied to determine if they can be used to …
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Scaling Laws for Deep Learning
… in the field. We then continue to analyze the sources of the scaling laws, offering an approximation-theoretic view and showing through the exploration of a noiseless realizable case that DL is in fact dominated by error sources very far from the lower error limit. We conclude by building on …
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Mars entry navigation performance analysis using Monte Carlo techniques
… initial sensor activation altitude, and examines error sources and covariance trends for this entry and descent scenario. The results from the analysis show that large attitude uncertainty resulting from the LN200 IMU bias causes a breakdown of the filter algorithm dlue to nonlinearities. The …
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Investigation of developments in interferometric synthetic aperture radar until 1994
… is explained, including a discussion of error sources, and a simulation for point targets is documented to illustrate the interferometric processing steps. The application of the SASAR VHF SAR system to interferometric operation is examined analytically.
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Modeling the Neutral Atmosphere in Continuously Operating GNSS Networks using OPUS-Projects
… Program and subject to potentially significant error sources in GPS.</p><p>The GPS error sources may reduce the accuracy of GPS-derived coordinates and ellipsoidal heights. The height component is primarily affected by inherent geometric weakness and by un-modeled part of the neutral atmosphere …
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Manufacturing Process Design and Control Based on Error Equivalence Methodology
Error equivalence concerns the mechanism whereby different error sources result in identical deviation and variation patterns on part features. This could have dual effects on process variation reduction: it significantly increases the complexity of root cause diagnosis in process control, and …
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Atomic Clock Augmentation For Receivers Using the Global Positioning System
… multiplier that translates range measurement error into vertical position error. This improvement in vertical accuracy is particularly beneficial for applications involving final approach and landing of aircraft using GPS, because GPS typically provides better horizontal accuracy than vertical …
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High-performance velocity, frequency and time estimation using GNSS
… a relative measurement, thus the measurements errors that remain constant during the time interval over which the velocity is estimated cancel out. Carrier-phase difference solution enables velocity accuracy in the order of 1 mm/s, a high-level accuracy which is crucial for many applications, …
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In situ measurement of lattice strain using synchrotron radiation and a conical slit system
… material as the sample was loaded. Potential error sources are discussed in relation to strain measurements and considerations when using the conical slit system are presented.
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Accuracy Improvement of Terrestrial Mobile Lidar System in Engineering Surveys
… of engineering surveys. A detailed analysis for error budget of the terrestrial mobile LiDAR system has been presented in order to well interpret the effects of individual error sources. Firstly, the 3D conformal coordinate transformation (3DCCT) through Least Squares Method (LSM) was applied by …
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Data processing in nanoscale profilometry
… are addressed, too. Finally, this system's error sources are discussed and analyzed.
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Aspects of modelling geographic information in geodesy and geodynamics
… derived for two test areas. For this study three error sources were investigated: the error of omission, the aliasing error and the out-of-area error. We showed that error sources were dependent on the spatial extent and accuracy of the gravimetric measurements. Thirdly, the modelling of …
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Stability enhancement of atomic timekeeping using Raman adiabatic rapid passage
… this method suffers from serious systematic error sources, e.g., AC Stark shift and Zeeman shift, which alter the atomic resonance frequency. A new method based on adiabatic rapid passage (ARP) has been recently demonstrated at Draper which has significantly reduced phase sensitivity to …
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Spatial Econometrics Revisited: A Case Study of Land Values in Roanoke County
… tests, one can better identify misspecification error sources and establish a more statistically sound and reliable model than models based on existing spatial econometric practices. The findings of this dissertation basically confirm the validity of those three propositions. In addition, we …
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Vision-based Target Localization from a Small, Fixed-wing Unmanned Air Vehicle
… This thesis also presents a study of possible error sources and localization sensitivities to each source. From this study, an accuracy within 15.5 m of actual target location is expected. Also, several methods of filtering are presented, which allow for effective noise reduction. Finally, …
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GPU-accelerated Linear Solvers for High-order Finite Element Methods in Poisson Problems
… criteria are introduced to balance various error sources, thereby reducing the number of iterations. An adaptive mixed precision conjugate gradient algorithm is proposed to exploit the superior computational performance of GPUs at lower precisions while maintaining convergence and accuracy. …
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Autonomous error bounding of position estimates from GPS and Galileo
… important question is whether the navigation error is tolerable. Although differentially corrected GPS is accurate enough for the task most of the time, anomalous measurement errors can create situations where the navigation error is intolerably large. Detection of such situations is referred …
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Digital pulse interval modulation for optical communication systems
… band as well as for wide band channels. Possible error sources are presented and the system performance degradation with these error sources is discussed and a comparison is made with isochronous DPPM and PCM. For performance evaluation of analogue systems, signal-to-noise ratio was mathematically …
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Experimental demonstration and exploration of quantum lattice gas algorithms
… of the NMR implementations, we explore two major error sources (1) the systematic error in the collision operator and (2) the linear approximation in the initialization. Since the mass density evolving under the Burgers equation develops sharp features over time, this is a stronger test of liquid …
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