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 34 for “"Phase measurements"”.
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Digital phase tightening for improved spatial resolution in millimeter-wave imaging systems
… imaging system using a technique called digital phase tightening for improved spatial resolution. Digital phase tightening uses feedback and oversampling to accurately measure the amplitude and phase of an incoming signal. Furthermore, it can be implemented using only a delay-lock loop, an …
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Spoofing GPS receiver clock offset of phasor measurement units
… clock offset to compute a time-stamp for its measurements, an error in the receiver clock offset introduces a proportional phase error in the voltage or current phase measurements provided by the PMU with a phase-wrap of $2\pi$ (in practice, the computed maximum receiver clock offset error is …
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Interpolation of Experimental Error Statistics for Mission Design of GPS Partial Attitude Determination
… in order to generate pseudorange and carrier phase measurements from satellites to receiver antennas. Antenna separation as well as receiver quality are varied, with error statistics collected and tabulated for each variation. Experiments with real receivers are conducted in a rural …
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Analysis and Conditioning of GNSS Measurements from Smartphones for Precise Point Positioning in Realistic Environments
… the availability of raw GNSS code and carrier-phase measurements from dual-frequency chips in smartphones, Precise Point Positioning (PPP) can be used to improve the accuracy of the positioning solution offered by them, without any additional reference infrastructure. In realistic applications …
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An Experimental Approach to Teaching the Concept of Functional Diversity.
… a controlled growth chamber. During the growth phase, measurements were taken to highlight temporal differences in development. After two months, wet and dry weights of aboveground and belowground portions were measured as indicators of productivity.</p><p>Research showed unique developmental …
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Measurements of the second hyperpolarizabilty of argon, methane, carbon tetrafluoride, and sulfur hexafluoride
… by means of the dc Kerr effect in the gas phase. Measurements were made over a range of densities and extrapolated to the zero density limit. The results obtained have an uncertainty of 1.7%, 1.1%, 0.8%, and 0.5% for SF{dollar}\sb6{dollar}, CF{dollar}\sb4{dollar}, Ar, and …
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Handheld Antenna Assessment Based on CV Ego-motion Position and Orientation Estimation of a Mobile Device
… using Computer Vision techniques and the antenna phase measurements, thus providing a feasible solution to its future application in the assessment of the 5G antenna array.
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Development and deployment of a residential voltage level phasor measurement unit
… for synchrophasors dictates. By building a one-phase, open source, distribution level PMU, the inner workings and complications of synchrophasor generation can be understood. Many studies have been performed in the area of PMUs, but this thesis focuses on distribution level measurements and the …
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Electrical noise in the spin-glass AuFe
Measurements of electrical resistance fluctuations have been performed on the spin-glass AuFe in order to compare with prior results in CuMn. Macroscopic AuFe samples showed a sharp increase in the noise with the onset of the noise at a temperature corresponding to the peak in the magnetic …
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Investigation into the impedance and communication requirements for the low voltage distribution line in the high frequency spectrum
… up to 100 Mbps. This thesis covers impedance measurements carried out in college buildings in Somerset, UK together with some residential houses in Somerset and London. The college buildings have both three-phase and single-phase architectures with various laboratories where loads are randomly …
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Smartphone precise positioning in urban environments using internal GNSS and IMU sensors
… and antennas, and along with frequent carrier-phase measurement discontinuities and losses, pose a challenge for advanced GNSS positioning techniques. In response to these challenges, this work is dedicated to addressing these smartphone positioning obstacles and aims to provide accurate, …
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Aptamer-based nano-scale dielectric sensor for protein detection
… antibody based immunosensing. In the initial phase of the work, the binding affinities of rationally designed oligomers towards a specific protein molecule (IgG) was studied and optimized under varying conditions of ionic strength and pH using fluorescence based methods. Also, various …
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Chemical Application of Silicon-Based Resonant Microsensor
… instrumentation. Current trends target real-time measurements using e.g. chemical microsensors built with microfabrication technologies. Among these, mass-sensitive chemical sensors, based on cantilever beams or surface acoustic devices, have shown substantial promise in gas-phase applications. In …
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Unimolecular decomposition kinetics at resolved internal energies.
… serve as a useful model for catalysis. These measurements were made in a custom built molecular beam apparatus, in which the experimental environment is free of the many complicating effects which are inherent to condensed phase measurements. The reacting clusters are formed in a supersonic …
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Indoor Positioning Using Synchronized Ultrasonic OFDMA Signals
… indoor localization using differential phase measurements of synchronized two-tone ultrasonic signals in an Orthogonal Frequency Multiple Access (OFDMA) scheme. This indoor positioning system (IPS) operates at an ultrasonic frequency of approximately 40kHz and synchronizes using an …
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Low frequency indoor radiolocation
… over 4000 amplitude and differential carrier phase measurements were taken in the Wiesner Building. Least-squares power law fits to that data over paths of up to 30m yield meter-class position estimates at 1KHz acquisition rates. The contributions of this thesis include detailed indoor …
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Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays
… systems were based on amplitude measurements of signals received from a single, nonstationary antenna. Next generation systems depended on phase measurements for direction-of-arrival information. With the advent of DSP-based direction fi nding, a return to amplitude-based …
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Fusion of observations from C-band polarimetric radar and S-band profiler radar during a convective storm
… approach based on differential propagation phase measurements for rain medium was applied and compared with measurements from the S-Band profiler. The analysis revealed that correcting for rain attenuation alone was insufficient to address the heightened attenuation caused by melting ice …
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Mass transfer characteristics of two-aqueous-phase liquid-liquid mixtures
… GA dye was the transferring solute from the salt phase to the PEG phase. Measurements were undertaken for several concentrations of the dye and the phase-forming solutes and with a range of different drop sizes, e.g. 2.8, 3.0 and 3.7 mm. The dye was observed to be present in the salt phase as …
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Parameters affecting interferometric coherence and implications for long-term operational monitoring of mining-induced surface deformation
… systems exists. Traditional field-based measurements are point-based meaning that the full extent of deforming areas is poorly understood. Field-based techniques are also labour intensive if large areas are to be monitored on a regular basis. To overcome these limitations, this …
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