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Showing 1 to 20 of 71 for “"DOA"”.
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Evaluation of Joint AOA and DOA Estimation Algorithms Using the Antenna Array Systems
… algorithms do not incorporate Delay of Arrival (DOA) information, the performance of these algorithms is not optimal. Recently proposed Joint AOA and DOA Estimation (JADE) algorithms, though more complicated, potentially have higher resolutions in both space and time domains. Our investigation …
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Direction of arrival estimation for spinning antenna based electronic intelligence systems
… accurately estimating the direction of arrival (DOA) of the received signals, provided that: the antenna's beamwidth is narrow; the received data is fully spread across the antenna mainlobe; the number of data samples is large; the signal to disturbance ratio (SDR) is large. However, the …
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Underwater Direction-of-Arrival Finding: Maximum Likelihood Estimation and Performance Analysis
… 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 the noise on sensor …
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Electromagnetic Vector-Sensor Direction-of-Arrival Estimation in the Presence of Interference
… 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 differences between the …
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Weak interference direction of arrival estimation in the GPS frequency band
… 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 of snapshots required …
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Sparse spectrum fitting in array processing
… 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 respectively, the DOA estimation problem is reformulated under the framework of Sparse Signal …
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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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Development of a Single-Channel Direction Finding Algorithm
… receivers to estimate the direction-of-arrival (DOA) of a targeted emitter using characteristics of the signal received at each of the antennas in the array. In general, DF systems can be classified both by the number of receivers employed as well as which characteristics of the received signal …
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ARRAY PROCESSING TECHNIQUES FOR ESTIMATION AND TRACKING OF AN ICE-SHEET BOTTOM
… 10 range-bins. Second, a direction of arrival (DOA)-based tracker is used to estimate the DOA of the backscatter signals sequentially from range bin to range bin using two methods: a sequential maximum a posterior probability (S-MAP) estimator and one based on the particle filter (PF). A dynamic …
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Age-Related Changes and Regional Variations in Three-Dimensional Microstructural Properties of Male Proximal Femoral Trabecular Bone
… model index (SMI) and degree of anisotropy (DOA). Results: The results showed that the trabecular microstructure changed significantly with age, as well as varied from different regions of the proximal femur. There was a significant decrease in bone volume fraction and an almost identical …
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Performance Comparison Between Music And Esprit Algorithms For Direction Estimation Of Arrival Signals
… for the estimation of Direction of Arrival (DOA) of incoming signals to the smart antenna. The comparison of these two algorithms was done on the basis of parameters like number of array elements, number of incoming signals, angle difference between the incoming signals, number of the samples …
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Interference Mitigation by Reconfigurable Adaptive Antenna Array
… as target detection and direction of arrival (DOA) estimation to list a few. Traditional receiver structures with a fixed array configuration are either inefficient due to array redundancies or may incur significant performance loss due to insufficient degrees of freedom (DoFs) under different …
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Time Delay Estimate Based Direction of Arrival Estimation for Speech in Reverberant Environments
… 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 available that perform better …
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3D Massive MIMO and Artificial Intelligence for Next Generation Wireless Networks
… linked to the uplink (UL) direction of arrival (DoA) estimation through estimation of signal parameters via rotational invariance technique (ESPRIT). Assuming non-orthogonal/non-ideal spreading sequences of the UL pilots, the performance of the UL DoA estimation is analytically characterized and …
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Nonlinear Control System Stability Metrics via A Singular Perturbation Approach
… the determination of the Domain of Attraction (DOA) is a problem of fundamental importance, and through bifurcation analysis and Lyapunov’s methods, the relationship between the estimated DOA and the perturbation parameters are established. The concepts SPM, GGM and the corresponding assessment …
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Effect of hot-iron branding on the cheek or upper hind limb on cortisol levels, behaviour and production in feedlot calves
… measuring 11,17-dioxoandrostanes (11,17-DOA). Other outcomes monitored included behavioural traits for seven days after branding, individual average daily weight gain (ADG), morbidity and mortality during the feedlot period and histopathological evaluation of the brand mark on the skin …
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Towards Maintainable and Explainable AI Systems with Dataflow
… in which we examine data-oriented architecture (DOA) as a promising software architecture paradigm that machine learning systems can benefit from. We focus on measuring the level of adoption of DOA in practical deployments of machine learning and show that even though the paradigm itself is …
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Array Signal Processing Algorithms for Beamforming and Direction Finding
… of beamforming and direction of arrival (DOA) estimation. In the beamformer design, we employ the constrained minimum variance (CMV) and the constrained constant modulus (CCM) criteria to propose full-rank and reduced-rank adaptive algorithms. Specifically, for the full-rank algorithms, we …
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