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Showing 1 to 20 of 30 for “"periodogram"”.
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Estimation of partial group delay with applications to small samples
… are the discrete Fourier transform and the periodogram ordinates. The procedure consists of finding preliminary values for the partial group delay parameter. The mean of the preliminary values is then estimated using transforming and modeling techniques on the preliminary values. A key …
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Intra-seasonal convection dynamics over Southwest and Northeast Tanzania : an observational study
… years and small fluctuations in other years. Periodogram analyses results reveal that dominant periodogram values for the oscillations were different in different years over both areas. Dominant periodogram peaks with periods more than 6 pentads (30 days) occurred 40% of the time on the …
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Common cyclicities in seismicity and water level fluctuations at the Charlevoix seismic zone of the St. Lawrence River
… of approximately 55 to 70 year periods. Fisher’s periodogram ordinate test, applied to the spectral analyses results to determine the significance of the largest periodogram ordinate with respect to the average, tested the 13.4-year periodogram ordinate of the number of events time series …
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Parameter estimation for a two-state semi-Markov model of a univariate point process.
… density of intervals was estimated by the periodogram and a Kolmogorov-Smirnov test of fit was conducted. The asymtotic exponential distribution and independence of the periodogram points were used to calculate an approximate likelihood function. A system of equations was then formed to …
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A function space approach to the generalized nonlinear model with applications to frequency domain spectral estimation
… least squares procedure applied to the periodogram produces estimates of spectral density model parameters for Gaussian univariate time series which have the same asymptotic variance as those produced by maximizing the true likelihood. In this dissertation, McCullagh's theory is combined …
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About the quality of parametric power spectral estimates
… estimates. The AR ladder estimator and classical periodogram based moving average (MA) estimators are then evaluated against the theoretical Cramer-Rao bound for AR and ARMA process realizations.
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Time series photometry of the dwarf planet Eris
… and Eris' magnitude was plotted over time. A periodogram was used to search for a periodic solution, but did not yield a significant signal. This means that the rotation period of Eris was below the detection limit of the data, so this detection limit was calculated. For a 6 hour period, the …
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Statistical Spectral Parameter Estimation of Acoustic Signals with Applications to Byzantine Music
… SIgnal Characterization (MUSIC) algorithm, (8) Periodogram method, (9) Quinn & Fernandes Filtered Periodogram, (10) Rife & Vincent Estimator, and (11) the Fourier transform. Algorithm performance was very precise. The psychophysical aspect of human pitch discrimination is explored. The results …
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The best truncation point for the estimated spectral density function of a stationary time series
… density estimator is obtained by using the periodogram representation of the spectral density function. However, if the estimator is to be consistent, a weight function which satisfies certain conditions must be added to the periodogram estimator. If the weight function is a truncated …
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Spectrum sensing based on capon power spectral density estimation
… outperforms the spectrum sensing based on the Periodogram method in detecting both busy and free channels. In addition, simulation results show that the cooperative approach improves the spectrum sensing function.
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VALIDATION OF AGE AND GROWTH USING MICROCONSTITUENT ANALYSIS OF FISH HARDPARTS
… in otoliths were identified using a Lomb-Scargle periodogram analysis that confirmed that cycles in Mg corresponded to annulus formation in the model species. This same approach was applied to Atlantic monkfish, a species without a valid ageing procedure. Annular chemical oscillations occurred in …
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Uncertainties in Oceanic Microwave Remote Sensing: The Radar Footprint, the Wind-Backscatter Relationship, and the Measurement Probability Density Function
… The probability density function of modified periodogram averages (a spectral estimation technique) is derived in generality and for the specific case of power estimates made by the NASA scatterometer. The impact on wind retrieval is quantified.</p>
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Characterisation of small, close-approaching near-earth asteroids
… composition, as well as using a Lomb-Scargle periodogram to extract the rotation period from multi-band photometry. The taxonomic probabilities were determined with the colours g0−r 0 and r0−i 0 , in combination with a machine learning (ML) algorithm trained on synthetic colours from observed …
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Transfer function estimation using time-frequency analysis
… Transfer Function Estimate and Welch's Averaged Periodogram Method.
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First- and Second-Order Properties of Spatiotemporal Point Patterns in the Space-Time and Frequency Domains
… domain though construction of a spatiotemporal periodogram. The methodology provided is tested through simulation of spatiotemporal point patterns and by analysis of a real data set. The biological application concerns the estimation of the homerange of groups of the endangered red-cockaded …
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Topics In Time Series Analysis And Forecasting
… is shown to have lower power than the cumulative periodogram test against both fractional noise and standard ARMA alternatives.
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Application and simulation of imaging Fabry-Perot interferometers to observe the upper atmosphere
… at orthogonal look directions. We show how periodogram analysis can determine the frequency of the AGW. Finally, a satellite-based FPI scenario is simulated with look directions scanning downward. In this viewing geometry, we show that altitude-dependent temperature and wind profiles can be …
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Applications of nonuniform sampling in wideband multichannel communication systems
… to furnish their salient features. The adopted periodogram-type estimators are tailored to each of the schemes and their statistical characteristics are assessed for stationary, and cyclostationary signals. Their ability to alleviate the bandwidth limitation of uniform sampling is demonstrated …
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An analysis of beta cephei stars in NGC 3293 and the effects of stellar rotation
… frequencies in these stars, by means of Fourier periodogram analysis. All of the stars are found to be multiperiodic, with up to five frequencies identified for individual stars. Physical parameters of the stars are determined from previous photometric results in the literature. These parameters …
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Sensor Drive Mobile application for health awareness The SSURE (Software System for User Running Evaluation) app for Android: a design that won’t let you down
… to obtain the SPM value by using the Lomb Periodogram technique that can effectively process unevenly sampling data, which is a feature of the data captured from the built-in accelerometer sensor on a smartphone/tablet device. In order to process the time-stretched audio file that is …
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