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 15 of 15 for “"direction-of-arrival estimation"”.
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Direction of arrival estimation using antenna arrays
The objective of this thesis is to design, build and evaluate a direction-of-arrival measurement system using an antenna array operating at 2050 MHz. The first phase of the project is an extensive study of various high resolution DOA estimation algorithms. The algorithms studied include …
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Weak interference direction of arrival estimation in the GPS frequency band
… This thesis discusses techniques to estimate the direction of arrival (DOA) of weak interferences in the GPS frequency band using antenna arrays. The main issues which affect weak GPS interference DOA estimation accuracy are the antenna array errors, interference from other GPS signals, the number …
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Direction of arrival estimation for spinning antenna based electronic intelligence systems
The spinning directional antenna is the most cost-effective antenna configuration for providing high gain over a wide (multi-octave) radio frequency (RF) range. Thus, it is the appropriate antenna configuration for increasing the intercept range of an electronic intelligence (ELINT) system, which …
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An electrically small multi-port loop antenna for direction of arrival estimation
Direction of arrival (DoA) estimation or direction finding (DF) requires multiple sensors to determine the direction from which an incoming signal originates. These antennas are often loops or dipoles oriented in a manner such as to obtain as much information about the incoming signal as possible. …
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Electromagnetic Vector-Sensor Direction-of-Arrival Estimation in the Presence of Interference
… problem regarding signal-selective narrowband direction-of-arrival (DOA) estimation in the presence of interference. The approach in this thesis relies on a high-resolution ESPRIT-based algorithm. Unlike spatially displaced arrays, the sensor cannot estimate the DOA of sources using phase …
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Time Delay Estimate Based Direction of Arrival Estimation for Speech in Reverberant Environments
Time delay estimation (TDE)-based algorithms for estimation of direction of arrival (DOA) have been most popular for use with speech signals. This is due to their simplicity and low computational requirements. Though other algorithms, like the steered response power with phase transform (SRP-PHAT), …
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Design and analysis of direction-of-arrival estimation systems using electrically small antenna arrays
The rst direction-of-arrival 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 …
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Acoustic vector-sensor array performance
… 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 and without modeling errors, or "mism;atch." It also develops a hybrid Cramer-Rao bound for direction-of-arrival estimation …
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Sparse spectrum fitting in array processing
In this thesis, we focus on the application of sparsity-encouraging regularization techniques to the problem of Direction-Of-Arrival (DOA) estimation using sensor arrays. By developing the sparse representation models for the spatial covariance matrix of correlated or uncorrelated sources …
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Highly Robust and Efficient Estimators of Multivariate Location and Covariance with Applications to Array Processing and Financial Portfolio Optimization
… these matrices are usually estimated, and often, the data used for these estimates are non-Gaussian or may be corrupted by outliers or impulsive noise. To address this, robust estimators should be employed. However, in signal processing, where complex-valued data are common, the robust …
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ARRAY PROCESSING TECHNIQUES FOR ESTIMATION AND TRACKING OF AN ICE-SHEET BOTTOM
… condition required to model the flow dynamics of an ice sheet. In this work, using low frequency multichannel radar data, we locate the ice bottom using two types of automatic trackers. First, we use the multiple signal classification (MUSIC) beamformer to determine the pseudo-spectrum of the …
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Efficient and guaranteed algorithms for sparse inverse problems
… a sparse signal model. Most notably, recovery of the signal by computationally efficient algorithms is guaranteed for certain randomized acquisition systems. However, there is a discrepancy between the theoretical guarantees and practical applications. In applications, including Fourier imaging …
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Multichannel source separation and tracking with phase differences by random sample consensus
… tackled from many different angles. The use case of interest in this thesis is that of multiple moving and simultaneously-active speakers in a reverberant room. This is a common situation, for example, in social gatherings. We human beings have the remarkable ability to focus attention on a …