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 27 for “"Spectrum Estimation"”.
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Computationally Intensive Methods for Spectrum Estimation
Spectrum estimation is an essential technique for analyzing time series data. A leading method in the field of spectrum estimation is the multitaper method. The multitaper method has been applied to many scientific fields and has led to the development of new methods for detection signals and …
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Time Aliasing Methods of Spectrum Estimation
Time aliasing methods of spectrum estimation alter the time representation of a signal for the purpose of improving its frequency domain representation. Time aliasing allows characteristics of longer time window functions to be used with shorter DFT length. Windows designed specifically for use …
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A maximum liklihood method for directional spectrum estimation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Horizontal directional spectrum estimation of the Heard Island transmissions
… to form an estimate of the directional power spectrum. This spectrum determines if any horizontal multipath is detectable. The preliminary signal conditioning, including frequency spectrum estimation and demodulation required before beamforming is described. Conventional and adaptive …
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Horizontal directional spectrum estimation of the Heard Island transmissions
Thesis (Ocean. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, and Woods Hole Oceanographic Institution, 1994.
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New algorithms for image analysis, compression, and 2-D spectrum estimation in the radon space
… of an object of known shape and location, and an estimation of the associated parameter. A new approach to binary image compression is proposed, based on a representation of binary objects by a small number of projections. Additional compression is obtained by coding the 1-D non-binary …
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Rational modeling and linear prediction of random fields
An approach to the two-dimensional spectrum estimation problem is proposed that is based upon modeling a random field as the output of a rational linear system driven by the innovations of the field. A variety of linear prediction problems, each depending upon the definition of past, may be …
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Digital signal processing analysis of switched capacitor filters
… procedures in switched capacitor noise spectrum analysis, various spectrum estimation techniques are presented along with test results of noise spectrum estimation of a typical switched capacitor integration circuit.
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Localization of Dynamic Acoustic Sources with a Maneuverable Array
… of source localization and time-varying spatial spectrum estimation with maneuverable arrays. Two applications, each having different environmental assumptions and array geometries, are considered: 1) passive broadband source localization with a rigid 2-sensor array in a shallow water, multipath …
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Multitaper Methods for Cyclostationary Feature Detection in Time Series Data: Application to ACE Interplanetary Magnetic Field Data
… processes is sought. Conventional spectrum estimation techniques assume that the data is a realization of a stationary process. If the data is cyclostationary, standard methodology, which assumes stationarity and so autocovariances that are unchanging over time, may lead to poor …
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Multiple radar environment emission deinterleaving and PRI prediction
… with SS (SDIF SS) and interleaved pulse train spectrum estimation. The interleaved pulse train spectrum estimation algorithm results could not be replicated and were not included in simulations. The TOA based tracking algorithms that were also investigated were Delta-t histogram, Kalman filter, …
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Development of a plasmon resonance enhanced optical trap for characterisation of single metal nanoparticle
… pattern of backscattered light and extinction spectrum. The necessary theories and corresponding equations for trapping force and extinction spectrum estimation are presented including all the assumptions and constraints that were applied. Moreover, the results from these characterisation …
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Consensus Algorithms for Estimation and Discrete Averaging in Networked Control Systems
… algorithm to estimate in a decentralized way the spectrum of the Laplacian matrix that encodes the network topology. As emergent behavior, each agent's state oscillates only at frequencies corresponding to the eigenvalues of the Laplacian matrix thus mapping the spectrum estimation problem into a …
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From theoretical promise to observational reality : calibration, foreground subtraction, and signal extraction in hydrogen cosmology
… mathematical framework that includes power spectrum estimation. Foreground subtraction is also explored in the context of global signal experiments, and data analysis methods that incorporate angular information are presented. Finally, we apply many of the aforementioned methods to data from …
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An Inverse Theory Approach to Incoherent Scatter Drift and Temperature Estimation at the Jicamarca Radio Observatory
In this thesis we present a new spectral estimation technique which radically improves Equatorial E&ar;xB&ar; plasma drift measurements at low signal to noise ratios. The new technique exploits the long correlation times obtained when a radar beam is pointed perpendicular to the magnetic field. …
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Learning sparse features and metric in signal and image processing
… performance for super-resolution signal spectrum estimation. On the other hand, in order to enhance the discriminative power of learned features, supervised learning is crucial. A proper metric is desired for various problems, such as image retrieval, similarity learning and face …
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Initial exploration of 21-cm cosmology with imaging and power spectra from the Murchison Widefield Array
… with a primary goal of measuring the power spectrum of the 21-cm signal from neutral hydrogen during the Epoch of Reionization (EoR). In this thesis, we detail efforts to characterize the MWA system, and present scientific results from a 32-element prototype interferometer deployed at the …
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Multitaper Transfer Function Estimates and the Hunt for Coherent Signals Trespassing on Time Series Regression Models
… further interpretation of the model. Multitaper spectrum estimation expresses the transfer function in terms of the eigencoefficients of predictor and response signals. Advantages of the multitaper method over alternative estimation procedures include that it controls for broadband bias, is an …
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A Cognitive Radio Compressive Sensing Framework
… given the limited availability of radio spectrum, and is further exacerbated by a rigid licensing regulatory regime. Spectrum however, is largely underutilized and this has prompted regulators to promote the concept of opportunistic spectrum access. This allows unlicensed secondary users …
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Non-contract Estimation of Respiration and Heartbeat Rate using Ultra-Wideband Signals
… radar system for respiratory and heartbeat rate estimation. Some simulation and real experimental results are presented to demonstrate the capability of the respiration rate detection. However, past analysis are mostly based upon the assumption of an ideal experiment environment. The accuracy of …
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