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.
Results
Showing 1 to 20 of 20 for “"Frequency Tracking"”.
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Feedthrough-immune frequency tracking of electrostatic MEMS resonators
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Modeling and frequency tracking of marine mammal whistle calls
… Since the whistle calls are composed of frequency modulated harmonic tones, they are best modeled as a weighted superposition of harmonically related sinusoids. Previous research with bottlenose dolphin whistle calls has produced synthetic whistles that sound too “clean” for use in a …
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Modeling and frequency tracking of marine mammal whistle calls
… Since the whistle calls are composed of frequency modulated harmonic tones, they are best modeled as a weighted superposition of harmonically related sinusoids. Previous research with bottlenose dolphin whistle calls has produced synthetic whistles that sound too "clean" for use in a …
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Automated Force-Velocity Profiling of NFL Athletes via High-Frequency Tracking Data
… profiling using publicly available high-frequency tracking data of NFL players. We demonstrate that our derived force-velocity envelopes match observed position and player performance, and provide a proof of concept framework that would allow teams to leverage automated force-velocity …
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Development of ultra-stable MEMS oscillators with 10⁻¹¹-level frequency stability via dual-mode temperature compensation
This thesis investigates the long-term frequency stability limits of encapsulated silicon MEMS resonators and develops two clock architectures to achieve high-precision, low-drift operation suitable for timing applications. The study is based on an encapsulated, heavily boron-doped Lamé-mode …
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A business plan for portable RF tracking devices
… of an opportunity to use portable radio frequency tracking devices for locating individuals throughout North America. Until now, many manufacturers of wireless tracking systems have focused their efforts on the tracking of vehicles and assets in shipment. The miniaturization of the …
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A nonlinear adaptive filter for improved operation and protection of power systems
… symmetrical component estimation, (3) phase and frequency estimation, (4) sag analysis and (5) distributed generation synchronisation and protection. The appli-cations were chosen such that the amplitude, phase and frequency tracking ability are thoroughly tested.
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Synchronized Measurements And Applications During Power System Dynamics
… tend to be affected by prevailing system frequency. Some major blackouts in power systems are indeed featured with very large frequency disturbance. Quantitative study done in this dissertation shows that small frequency disturbance may lead to measurement errors, and large frequency …
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Condition Monitoring Techniques for Wind Turbines
… and conclusions drawn on the applicability of frequency tracking algorithms. The newly developed algorithm is compared with a published method to establish its advantages and limitations.
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Iterative Decoding and Channel Estimation over Hidden Markov Fading Channels
… applications have included signal estimation, frequency tracking, equalization, burst error characterization, and transmit power control. Of special significance to this thesis, however, has been the use of HMMs to model fading channels typical of wireless communications. This variegated use of …
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Model-based spectral inference in noisy physical time series: applications in laser linewidth estimation and precision magnetometry
… equalization (PSE) criterion to deconvolve laser frequency noise spectra from delayed self-heterodyne (DSH) measurements, addressing spectral nulls and measurement noise. The second applies Bayesian in- ference to the laser system, deriving a likelihood function for the observed spectrum and …
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Encoding sex ratio information: automatic or effortful?
… work involved four experiments; two using frequency tracking methodology and two using summary statistic methodology. Experiment 1 found a strong correlation between OSR of conditions and estimates of sex ratio. Participants in Experiment 1 were uninformed on the purpose of the experiment, …
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Power sharing conditioning control in single-phase parallel distributed generations with simple improvement of droop control
… established, this control strategy is combined frequency and voltage droop method. In droop strategy, the voltage and frequency are drooped to a new rated value to ensure power load sharing. Therefore this project to have an improvement of the droop under self-frequency restoration method is …
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New Methods for Synchrophasor Measurement
… grid stability in real-time. A power system Frequency Monitoring Network (FNET) was first proposed in 2001 and was established in 2004. As a pioneering WAMS, it serves the entire North American power grid through advanced situational awareness techniques, such as real-time event alerts, …
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Frequency Locking Techniques Based on Envelope Detection for Injection-Locked Signal Sources
Signal generation at high frequency has become increasingly important in numerous wireline and wireless applications. In many gigahertz and millimeter-wave frequency ranges, conventional frequency generation techniques have encountered several design challenges in terms of frequency tuning range, …
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Analysis and design of a high frequency induction-heating system
… semiconductor technology are making high frequency converters for induction heating more feasible at power levels up to 50kW. This research presents the development and analysis of a solid-state induction-heating system, operating directly off single-phase mains frequency, which enables …
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Design and Fabrication of Piezoelectric Sensors and Actuators for Characterization of Soft Materials
… third objective was addressed through resonant frequency tracking of low- and high-order modes in dynamic-mode cantilevers to enable the real-time characterization of hydrogel viscoelastic properties and continuous monitoring of sol-gel phase transitions over a wide dynamic range using …
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Development of Optimal Electromagnetic Resonance Rewarming Technology for Cryopreservation
… source and resonance chamber. In addition, a frequency tracking component was added to ensure the resonant state during the rewarming process, when the cryopreserved materials shift the resonance as temperature increases. Finally, to fully utilize the electromagnetic field energy provided by …
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High Accuracy Real-time GPS Synchronized Frequency Measurement Device for Wide-area Power Grid Monitoring
Frequency dynamics is one of the most important signals of a power system, and it is an indicator of imbalance between generation and load in the system. The Internet-based real-time GPS-synchronized wide-area Frequency Monitoring Network (FNET) was proposed to provide imperative frequency dynamics …
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Digital enhancement techniques for fractional-N frequency synthesizers
… thesis is on improving the energy efficiency of frequency synthesizers and clocking modules by exploring design techniques at both the architectural and circuit levels. In the first part of this work, a digital fractional-N phase locked loop (FNPLL) that employs a high resolution time-to-digital …