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 53 for “"direction of arrival"”.
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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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A Bayesian Approach to Beamforming for Uncertain Direction -of -Arrival
… we present a Bayesian approach to the problem of beamforming without accurate knowledge about the direction-of-arrival. Under the Bayesian formulation, the proposed beamformer is constructed as a mixture of directional beamformers combined according to the data-driven posterior distribution. As …
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An Investigation of the Direction of Arrival of Radio Waves
… in DSpace on 2015-05-12T17:06:16Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0009032.PDF: 6481336 bytes, checksum: 5e196cb41203e30cb9d3816a72b98fbb (MD5) Previous issue date: 1954
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Underwater Direction-of-Arrival Finding: Maximum Likelihood Estimation and Performance Analysis
In this dissertation, we consider the problems of direction-of-arrival: DOA) finding using acoustic sensor arrays in underwater scenarios, and develop novel signal models, maximum likelihood: ML) estimation methods, and performance analysis results. We first examine the underwater scenarios where …
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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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The Determination of The Direction of Arrival of an Interference Field
… in DSpace on 2014-12-12T20:54:48Z (GMT). No. of bitstreams: 1 7811261.pdf: 5689015 bytes, checksum: 95c70d109547a9f519f28b5b29c9a8a0 (MD5) Previous issue date: 1978
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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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Signal direction-of-arrival and amplitude estimation for multiple-row bathymetric sidescan sonars
… sonars, the multipath reflections and other directional interferences are the key limiting factors for a better performance. This thesis proposes a new scheme to deal with the interferences using a multiple-row bathymetric sidescan sonar. Instead of smoothing the measurements over some time …
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Signal direction-of-arrival and amplitude estimation for multiple-row bathymetric sidescan sonars
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1998.
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Time Delay Estimate Based Direction of Arrival Estimation for Speech in Reverberant Environments
… 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), are …
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Some Basic Problems in the Determination of the Direction of Arrival of Radio Waves
… in DSpace on 2014-12-04T21:03:04Z (GMT). No. of bitstreams: 1 5900521.pdf: 6605574 bytes, checksum: 3547ffaf3998eb080c0f8eb2906e0346 (MD5) Previous issue date: 1958
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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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Reconfigurable Resonant Cubic HF Phased Array for In-Space Assembly Operation
… arrays face two major shortcomings: the presence of ambiguities in direction of arrival measurements and beam broadening endfire effects. The literature provides methods for addressing and minimizing these problems on conventional planar phased array structures, but there has been no investigation …
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Adaptive Beamforming Using a Microphone Array for Hands-Free Telephony
… thesis describes the design and implementation of a 4-channel microphone array that is an adaptive beamformer used for hands-free telephony in a noisy environment. The microphone signals are amplified, then sent to an A/D converter. The microprocessor board takes the data from the 4 channels and …
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Randomly Spaced Smart Antennas
The goal of this thesis is to develop adaptive array' features out of randomly spaced antenna elements. Most optimization techniques that have been presented so far for non-equidistant antenna arrays have been restricted to the analysis of symmetric or linear geometries. Several direction of …
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