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 25 for “"array performance"”.
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Acoustic vector-sensor array performance
… velocity. Velocity measurements can increase array gain and resolve ambiguities, but make vector-sensor arrays more difficult to analyze. This thesis derives a new set of useful performance measures for acoustic vector-sensor arrays. It characterizes the vector-sensor array beampattern with …
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Low frequency array performance in shallow water
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1963.
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Modeling the effects of device scaling on field emitter array performance
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Design and Characterization of a Wave Energy Converter Array Experimental Test Platform
… electrical energy. Wave energy converter (WEC) arrays consist of multiple individual WEC devices that are arranged in a specific pattern. The arrangement of the devices within the array is designed to optimize their performance and reduce their negative effects on the surrounding environment. …
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Antenna element pattern reconfigurability in adaptive arrays
… radiation reconfigurable antennas in an adaptive array setting. The work centers on arrays composed of a small number of widely spaced elements. Such array configurations (1) mitigate the effects of mutual coupling between reconfigurable elements, thereby maximizing their individual performance …
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Investigation of a Phased Array of Circular Microstrip Patch Elements Conformal to a Paraboloidal Surface
This thesis investigates the performance of a phased array of antenna elements conforming to a paraboloidal surface. We hypothesize that such a conformal phased array would have performance comparable to that of a correspondingly sized planar array. The performance of a paraboloidal array of …
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Analytical Methods Development for High-Throughput Photochemisty With Led Arrays
… construction, and evaluation of a series of LED array photolysis systems for high throughput photochemistry. Three generations of array systems of increasing sophistication are evaluated using calorimetric measurements and potassium tris(oxalato)ferrate(III) chemical actinometry. The results are …
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Real-time adaptive circuitry to support simultaneous radar and communications.
… common. This interference can lead to reduced performance for the involved systems, meaning dropped calls and missed radar detections. To help mitigate this spectral congestion, this work presents technological innovations to increase spectral efficiency and mobility for radio frequency (RF) …
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Handheld Antenna Assessment Based on CV Ego-motion Position and Orientation Estimation of a Mobile Device
… the development of millimetre-wave antenna array and the beamforming technology. 5G antenna array will require regular calibration as its performance depends on the physical orientation and movement of the device, the nearfield electromagnetic wave scattering which changes over time, as well …
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Investigation of mutual coupling effects on pattern null reconfigurable antennas in small adaptive arrays
Adaptive arrays composed of fixed pattern elements have been studied extensively in the past. In these arrays, adaptive processing algorithms have control over the magnitude and phase applied to each array element to modify the array pattern. Recently, pattern reconfigurable elements have been …
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Synthesis of Optimal Arrays For MIMO and Diversity Systems
… of adding additional elements to the optimal array and the relationship between aperture size or the description of the impinging field and the array performance. A synthesis procedure is proposed which uses genetic algorithm optimization to optimally place a reduced number of dipoles. The …
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In the wake of a tidal turbine
… axis tidal turbines are being installed in arrays, where device spacing is an important issue. Array performance will be affected as the flow from upstream devices (i.e. the wake) interacts with down-stream devices. Further experimental data is necessary to understand the characteristics of …
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Multi- Gigabit Patch Antenna Wireless Links: An Experimental Investigation.
… 4 GHz, and 6 GHz, these being combined into an array. Performance of the individual elements was analysed both experimentally and with the use of modelling, both sets of results were then compared and used to optimise the final design. A standard 4 QAM technique was employed to double the system …
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Robust vector sensor array processing and performance analysis
… of processing signals for many vector sensor array applications. In practice, however, mismatch (the difference between the assumed and actual system configurations), several noise processes and low sample support can pose significant problems. Processing techniques should be robust to these …
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Fabrication and characterization of porous metal emitters for electrospray applications
… of applicability in space. Electrospray emitter arrays have many advantages over existing electric propulsion devices including much lower mass per unit thrust and much lower volume per unit thrust than conventional ion and hall devices. Additionally, with emitter clustering, the thrust density …
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A wide-dynamic-range time-based CMOS imager
… 98.8 dB dynamic range and 44 dB peak SNR. The array performance lags slightly behind that of the individual pixels due to the additional noise power contributed to the array data by pixel-to-pixel mismatch effects, attributed primarily to gain and dark-current fixed pattern noise (FPN). The …
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Investigating the Performance Of Electrical Resistivity Arrays
… of synthetic data is used to evaluate the performance of five electrical resistivity arrays, with the primary criteria being the reproduction of sharp model boundaries. 2D synthetic noise free data were calculated simulating a modern fixed spacing multi-electrode cable. Twelve 2D synthetic …
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Robust Steering Vector Mismatch Techniques for Reduced Rank Adaptive Array Signal Processing
… vector mismatch can seriously degrade adaptive array performance and result in signal cancellation. These errors can be caused by many non-ideal factors such as beam steering angle errors, multipath propagation, and phase errors due to array imperfections. Since the MWF centrally features the …
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Head Mounted Microphone Arrays
Microphone arrays are becoming increasingly integrated into every facet of life. From sonar to gunshot detection systems to hearing aids, the performance of each system is enhanced when multi-sensor processing is implemented in lieu of single sensor processing. Head mounted microphone arrays have a …
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Towards Gamma-Ray Telescopes in Australia
… our Universe. The upcoming Cherenkov Telescope Array Observatory (CTAO), alongside H.E.S.S. in Namibia, are Imaging Air Cherenkov Telescopes (IACTs) that will cover roughly two thirds of the Southern Hemisphere gamma-ray sky. Short-term and variable events, or “transients”, in the Australian …
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