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 126 for “"measurement noise"”.
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A superconducting flux QuBit : measurement, noise and control
… by measuring its flux with a SQUID. The measurement efficiency and measurement-induced decoherence are investigated. A coherent transition assisted scheme is designed for a projective measurement on the qubit. A general method is developed to study qubit decoherence by environmental …
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GNSS Integrity Monitoring with Modelling Temporal Correlated Measurement Noise and an Application to RTK
… of GNSS positioning systems. It makes use of the measurements redundancy to check the statistical consistency of measurements and provide timely alarms. GNSS measurement noises are typically assumed to be uncorrelated Gaussian white noises in KF for GNSS integrity monitoring. However, this …
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Confidence bands, measurement noise, and multiple input - multiple output measurements using three-channel frequency response function estimator
… estimates indicate sources and magnitudes of noise in the measurement system. Both Monte Carlo simulations and experimental work are used to verify the statistical and uncorrelated content estimates. Relations to extend the three-channel FRF estimator to multiple input-multiple output …
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Axisymmetric equilibrium and stability analysis in Alcator C-Mod, including effects of current profile, measurement noise and power supply saturation
… against system uncertainty and the occurrence of noise and disturbances. At the same time, adaptive routines should be in place to handle unexpected events. The problem of robust control of the vertical position can be formulated in terms of identifying which variables affect vertical stability …
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A comparison of fixed parameter versus adaptive digital tracking filters
… tracking techniques over a range of process and measurement noise environments is considered. The problem is placed in the context of tracking a maneuvering vehicle from noisy position data with the vehicle accelerations considered as a random process about which the first and second order …
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Statistische Analyse der atmosphärischen Turbulenz und allgemeiner stochastischer Prozesse
… on the fundamental problem of the influence of measurement noise in experimental time series. It will be shown that by analyzing experimental time series measurement noise can be distinguished well from the intrinsic dynamical noise. It is found that the whole transition range from pure …
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Parameter Estimation Techniques for Nonlinear Dynamic Models with Limited Data, Process Disturbances and Modeling Errors
… and process disturbance intensities when measurement noise variance is known. Then, a Fully-Laplace Approximation Expectation Maximization (FLAEM) algorithm is proposed for simultaneous estimation of model parameters, process disturbance intensities and measurement noise variances in …
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Risk based control in uncertain environments
… suffers from sensitivity to sensor and process noise, as the value of risk associated with the robot's state is not well behaved. In order to correct for this sensitivity, a Stochastic Risk Gradient Controller (RGC) and sample-based Extended Kalman Filter (EKF) are proposed. The Sample Based EKF …
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Dynamic Bayesian networks for the classification of spinning discs
… choice of regularization variance, the impact of measurement noise on all of these, and performance over time. A common issue, leading to inaccurate sample-based representations, is the case of relatively low measurement noise combined with an insufficient number of particles. Our empirical …
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Performance and Robustness Assessment for a Robust Port-Hamiltonian Flight Controller
… robustness and performance. To replicate flight, measurement noise, model mismatch, wind, and discretization with time delay were implemented in a collection of simulation studies to understand which disturbances the novel control law was most sensitive to. Due to the non-additive nature and …
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Three-dimensional vibrometry via three positions of a one-dimensional laser doppler velocimeter
… The sensitivities of the resulting velocity to measurement noise and position errors are also analyzed. Recommendations are made for future testing and applications of this technique.
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Design of Robust PID Controllers with Constrained Control Signal Activity
… it leads to control signal sensitivity of measurement noise. A frequently varying control signal with too high amplitude will very likely lead to actuator wear and tear. For this reason it is extremely important for any PID design method to take this into account. The proposed controllers …
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Multiscale modeling and estimation of large-scale dynamic systems
… ocean surface height from satellite altimetric measurements. A modified 1/ f model is used in this thesis to jointly estimate the surface height of the Mediterranean Sea and the correlated component of the measurement noise in order to remove the artifacts apparent in maps generated with the …
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CPU Resource Management and Noise Filtering for PID Control
… part of the thesis deals with the design of measurement noise filters for PID control. The design is based on an iterative approach to calculate the filter time constant, which requires the information in terms of an FOTD model of the process. Tuning methods such as Lambda, SIMC, and AMIGO …
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A regression-based approach for simulating feedfoward active noise control, with application to fluid-structure interaction problems
… tools for simulating feedforward active noise control in the frequency domain. Feedforward control is numerically similar to linear least squares regression, and can take advantage of various numerical techniques developed in the statistics literature for use with regression. Therefore, …
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Adaptive Control for a Class of Nonlinear, Time Varying Rotational Systems
… are applied to attenuate the effects of measurement noise and actuator dynamics. The stability of this control law is investigated via Lyapunov analysis. Simulation results are provided showcasing overall controller performance of attitude control in the presence of both internal and …
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Suboptimal period design for a maneuvering missile to evade tracking filters
… in position of the missile on the ship, the measurement noise condition of the ship’s radar, and the missile’s model assumed in the ship’s filters. The missile’s control functions considered are periodic and of specific types (sinusoidal, square and sawtooth waveforms); therefore, the periods …
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Collaborative Estimation in Distributed Sensor Networks
… dissertation also analyzes how time-correlated measurement noise affects the uncertainties of inferred parameters. Imperfections such as baseline drift in sensors result in a time-correlated additive component in the measurement noise. Though some models of drift have been reported in the …
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Optimal fault detection and resolution during maneuvering for Autonomous Underwater Vehicles
… Optimization of the Kalman filter's system noise matrix, measurement noise matrix, and input gain scalar multiplier produced fault resolution which allowed for accurate detection of fault of relatively minor magnitude within minimal time constraints
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Experimental determination of the impulse response function for elastic vibrating systems
… is shown to be unbiased in the presence of measurement noise. Modal parameters are extracted from impulse response estimates using a modification of the Pisarenko harmonic decomposition method. The advantages of a time-domain approach over traditional Fourier analysis procedures, including …
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