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 48 for “"Frequency estimation"”.
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Accurate frequency estimation with phasor angles
… a balanced and stable condition at its designed frequency. Any significant upset of this balance will produce a change in the power system frequency. It is the responsibility of the monitoring and protective devices to detect and restore the system to the equilibrium operating condition at the …
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Frequency Estimation Using Time-Frequency Based Methods
… of spectral parameters such as its amplitude, frequency, phase, and the variability of its instantaneous spectral components. The accuracy of these parameters depends on several processing variables such as resolution, noise level, and bias of the algorithm used. This thesis presents some …
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Frequency estimation of pre-stressed and composite floors
… by ensuring a high floor fundamental natural frequency and damping. There is a need, therefore, for a method to accurately predict the fundamental natural frequency and damping of these floors and to ensure that they are high enough to avoid any resonance or perceptibility problems. Available …
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Area-constrained frequency estimation for focal plane arrays
… thesis focuses on the problem of detecting the frequency and amplitude of signals generated by focal plane array (FPA) on a per-pixel basis, i.e., pixel-matched processing. Addressing this problem requires the design of signal processing algorithms and circuit architectures subject to stringent …
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Real-Time Fundamental Frequency Estimation Algorithm for Disconnected Speech
… algorithm is presented for real-time fundamental frequency estimation of speech signals. This method extends and alters the YIN algorithm, which uses the autocorrelation-based difference function, by adding features to reduce latency, correct predictable errors, and make it structurally …
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Carrier phase and frequency estimation for burst-mode communications
… to apply synchronization of carrier phase and frequency for proper demodulation of data. These synchronizers play an even greater role when transmission is in burst mode. It is because that the receiver always asks for relock for separated burst, which transmits information from different …
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On the Use of Iterative Feedback in Private Frequency Estimation
… existing LDP mechanisms and baselines for frequency estimation. Experiments show gains in estimation performance in high privacy regimes over synthetic and real data. These experiments help discern scenarios where the Iterative LDP Algorithm actually learns from regularization induced …
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Implementation of Instantaneous Frequency Estimation based on Time-Varying AR Modeling
Instantaneous Frequency (IF) estimation based on time-varying autoregressive (TVAR) modeling has been shown to perform well in practical scenarios when the IF variation is rapid and/or non-linear and only short data records are available for modeling. A challenging aspect of implementing IF …
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Particle filtering for frequency estimation from acoustic time-series in dispersive media
… which can be used in a subsequent step for the estimation of propagation related parameters. We develop a particle filter to estimate these frequencies along with modal amplitudes, variance, model order. In the first part of our work, we consider a Gaussian model for the error in the data …
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High Precision Dynamic Power System Frequency Estimation Algorithm Based on Phasor Approach
… (GPS) ---synchronized relative to the wide-area frequency-monitoring network (FNET) ---has been developed at Virginia Tech. In this FNET system, an algorithm that employs the relationship between phasor angles and deviated frequency [13] is used to calculate both frequency and its rate of change. …
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Frequency Estimation of Linear FM Scatterometer Pulses Received by the SeaWinds Calibration Ground Station
… in transmitted power, pulse timing, and carrier frequency drift. Identifying these errors prevents their propagation to data products. A key aspect of this analysis involves accurately estimating the parameters of the SeaWinds transmissions. As better parameter estimates are researched and …
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A Model-Based Receiver for CPM Signals in a Cochannel Interference Limited Environment
… capability of the receiver determines this frequency reuse and is therefore critical. In this thesis, we propose an improved demodulation scheme, employing high-resolution frequency estimation techniques, for continuous phase modulated (CPM) signals in presence of CCI. Minimum shift keying …
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A nonlinear adaptive filter for improved operation and protection of power systems
… (1) sag detection, (2) symmetrical component estimation, (3) phase and frequency estimation, (4) sag analysis and (5) distributed generation synchronisation and protection. The appli-cations were chosen such that the amplitude, phase and frequency tracking ability are thoroughly tested.
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High-resolution sinusoidal analysis for resolving harmonic collisions in music audio signal processing
… due to resolution limits inherent in time-frequency analyses, when the harmonics of multiple sources occupy equivalent time-frequency regions, their individual properties are additively combined in the time-frequency representation of the mixed signal. Any such time-frequency point in a …
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Simulation study of frequency estimators
We develop a frequency estimator employing Kalman filter algorithm for rapid online frequency estimation in both additive white Gaussian noise channel and static fading channel. A new measurement model is proposed, which can describe the phase noise more accurately, thus improves the performance by …
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Sources of Fluctuations in Emerging Markets: DSGE Estimation with Mixed Frequency Data
… estimate the model implementing a Bayesian mixed frequency strategy that combines quarterly and annual data for 1950-2010. The mixed strategy allows us to extend the sample period 40 years back with annual data, which helps to identify permanent versus transitory shocks. And at the same time, it …
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Dissertation review on a new control perspective on phase locked loops
… loop (PLL), an essential means for online frequency detection of incoming signal, which is widely used in our modern day communication system. PLL is traditionally viewed as a non-linear feedback control loop that will automatically locks the adjustable frequency of a local oscillator in …
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New directions in streaming algorithms
… to augment classic streaming algorithms of the frequency estimation and low-rank approximation problems with machine learning oracles in order to improve their space-accuracy tradeoffs. The new algorithms combine the benefits of machine learning with the formal guarantees available through …
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A comparison of digital beacon receiver frequency estimators
Two algorithms for estimating the frequency and power of the carriers of 20 GHz and 30 GHz satellite signals are compared. Both algorithms operate on a prefiltered sequence generated by lowpass filtering followed by signal decimation for the purpose of sampling rate reduction. The lowpass filtering …
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