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 32 for “"delay estimation"”.
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Nonlinear filtering for narrow-band time delay estimation
This thesis presents a method for improving passive acoustic tracking. A large family of acoustic tracking systems combine estimates of the time difference of arrival (TDoA) between pairs of spatially separated sensors - this work improves those estimates by independently tracking each TDoA using a …
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Echo Delay Estimation to Aid Source Localization in Noisy Environments
Time-delay estimation (TDE) finds application in a variety of problems, be it locating fractures or steering cameras towards the speaker in a multi-participant conference application. Underwater acoustic OFDM source localization is another important application of TDE. Existing underwater acoustic …
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Overloaded Array Processing: System Analysis, Signal Extraction Techniques, and Time-delay Estimation
… channel is blindly estimated. Multi-user time delay estimation is one of the most important aspects of channel estimation for overloaded array processing. The final chapter of the thesis proposes a low-complexity data-aided time-delay estimation structure for embedding in a Per Survivor …
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Phase Transform Time Delay Estimation to Counteract Spectral Haystacking Effects in Jet Exhaust Flow Measurements
… Thrust measurement is possible with enough time delay estimates across different portions of the exhaust. This preliminary study did not take the full array of data necessary to measure thrust, but did validate key aspects of the measurement process. The turbulent shear layers of the exhaust …
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Hierarchical timing-driven partitioning and placement for symmetrical FPGAs
… FPGA chips so as to minimize the maximum delay through the system. We exploit the given hierarchy to achieve computational speedup. Delay estimation is done using an accurate empirical model. The major contributions of this thesis include multichip partitioning, accurate routing delay …
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Estimating partial group delay
Partial group delay is a spectral parameter, which measures the time lag between two time series in a system after the spurious effects of the other series in the system have been eliminated. For weakly-stationary processes, estimators for partial group delay are proposed based on indirect and …
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Estimating time delays between irregularly sampled time series
The time delay estimation between time series is a real-world problem in gravitational lensing, an area of astrophysics. Lensing is the most direct method of measuring the distribution of matter, which is often dark, and the accurate measurement of time delays set the scale to measure distances …
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Comparison of stopped delay between field measurements and HCM 2010 estimations at actuated signalized intersections
… studies have been performed to validate the HCM delay estimation model. This thesis aims to study the accuracy of the HCM 2010 delay estimation methodology for actuated signalized intersections using field data. The HCM stopped delay estimates were statistically compared with the field …
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ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΤΗΣ ΕΠΙΔΡΑΣΗΣ ΤΗΣ ΑΤΜΟΣΦΑΙΡΙΚΗΣ ΔΙΑΘΛΑΣΗΣ ΚΑΤΑ ΤΗ ΧΡΗΣΗ ΡΑΔΙΟΚΥΜΑΤΩΝ ΣΤΙΣ ΣΥΓΧΡΟΝΕΣ ΓΕΩΔΑΙΤΙΚΕΣ ΜΕΘΟΔΟΥΣ ΜΕΤΡΗΣΕΩΝ ΜΕΓΑΛΩΝ ΑΠΟΣΤΑΣΕΩΝ
… ON RADIOWAVE PROPAGATION ARE: ATTENUATION, TIME DELAY AND ANGULAR BENDING. THE TIME DELAY CAN BE SEPARATED INTO HYDROSTATIC AND WET DELAY. DEVELOPED HERE ARE MODELS FOR THE ZENTH WET DELAY ESTIMATION AND FOR THE ELEVATION DEPENDENCE OF THE HYDROSTATIC AND WET DELAY AND THE REFRACTION ANGLE. FOR …
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Novel multiuser detection and multi-rate schemes for multi-carrier CDMA
… schemes, this receiver is very sensitive to a delay estimation error. A blind adaptive two-stage decorrelating receiver based on the "bootstrap algorithm" is developed to combat severe performance degradation due to a delay estimation error. It is observed that in the presence of a delay …
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Performance Evaluation of Multiuser Detectors with V-BLAST to MIMO Channel
… and MIMO channel. Finally, the effect of channel estimation error and timing delay estimation error is evaluated for MIMO systems with multiple users.
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Estimating uncertainty models for speech source localization in real-world environments
… generalized cross-correlation framework for time delay estimation. This weighting function is derived from the speech spectrogram as the result of a transformation designed to optimally predict localization cue accuracy. By structuring the problem in this way, we take advantage of the …
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Microscopic Control Delay Modeling at Signalized Arterials Using Bluetooth Technology
Real-time control delay estimation is an important performance measure for any intersection to improve the signal timing plans dynamically in real-time and hence improve the overall system performance. Control delay estimates helps to determine the level-of-service (LOS) characteristics of various …
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Investigation of a Simulated Annealing Cooling Schedule Used to Optimize the Estimation of the Fiber Diameter Distribution in a Peripheral Nerve Trunk
… by a simulation technique known as group delay. These results could be further improved using a combinatorial optimization algorithm called simulated annealing. This paper explores the structure and behavior of simulated annealing for the application of optimizing the group delay estimated …
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Data-Driven Localization and Structure Learning in Reverberant Underwater Acoustic Environments
… knowledge such as synchronization and occluder estimation, which are inputs for the following stages of more refined algorithms. Within this framework, we introduce a 2D neural network boundary estimation method that outperforms the existing methods in the literature, and is robust to the large …
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Utility Accrual Real-time Channel Establishment in Multi-hop Networks
… the interfaces. The route selection is based on delay estimation performed at the source, destination, and all routers in the path, from source to destination. We simulate the algorithms, measure and compare their performance with open shortest path first (OSPF). Our simulation experiments show …
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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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A framework for predicting urban freeway incident delays in real time
… incident will have on a freeway in the sense of delays to drivers. The goal of this research was to build the framework for an algorithm that can more accurately predict delays due to incidents in real-time given a sufficient amount of data. In this research, many existing delay estimation …
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Localization of Dynamic Acoustic Sources with a Maneuverable Array
… 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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Comparison of edge turbulence velocity analysis techniques using Gas Puff Imaging data on Alcator C-Mod
… is computed [1, 2]. The other is based on time-delay cross-correlation of successive images used to track the motion of discrete emission structures [3, 4]. Several Gas-Puff-Imaging experiments were conducted to obtain data taken using the GPI Phantom Camera. The analysis of and results from …
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