Journal ArticleDOI
Spectral Moment Estimates from Correlated Pulse Pairs
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TLDR
In this article, the first two power spectrum moments from the pulse pair covariance are analyzed and the mean frequency estimation from interlaced pulse pairs is compared to provide a continuum of statistics from equispaced tightly correlated to statistically independent pulse pairs.Citations
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An axial velocity estimator for ultrasound blood flow imaging, based on a full evaluation of the Doppler equation by means of a two-dimensional autocorrelation approach
TL;DR: In this article, a 2D autocorrelator is proposed to estimate axial velocity values by evaluating the Doppler equation using explicit estimates of both the mean DoP and the mean RF frequency at each range gate location.
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Estimation of Spectral Moments for Weather Echoes
TL;DR: In this paper, the authors investigated the effect of echo signal power, mean Doppler velocity, and spectrum width on the performance of a weather radar system using maximum likelihood (ML) solutions.
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Doppler weather radar
TL;DR: In this paper, the authors present a form of the weather radar equation which explicitly shows the echo power loss due to finite receiver bandwidth and how it is related to the range weighting function.
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High-frequency color flow imaging of the microcirculation
David E. Goertz,David E. Goertz,Joanne L. Yu,Robert S. Kerbel,Peter N. Burns,F. Stuart Foster +5 more
TL;DR: In this article, a slow-scan color flow imaging (CFI) system operating in the 20-100-MHz range has been optimized to image the microcirculation of a murine ear model.
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Performance of a broad-band acoustic Doppler current profiler
TL;DR: In this paper, a broadband acoustic Doppler current profiler (ADCP) is described, with a useful range comparable to that of a commercially available narrowband (incoherent) system of the same acoustic frequency, but having enhanced performance.
References
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Journal ArticleDOI
A covariance approach to spectral moment estimation
K. Miller,M. Rochwarger +1 more
TL;DR: It is shown that the leading term in the variance computations is identical with the Cramer-Rao lower bound calculated using the Fisher information matrix.
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Simulation of Weatherlike Doppler Spectra and Signals
TL;DR: In this article, a versatile algorithm to generate weather-like spectra of any desired shape is described, and applications are briefly discussed, and a variety of weather-related applications are discussed.
Journal ArticleDOI
A Semicoherent Detection and Doppler Estimation Statistic
TL;DR: In this article, a uniform train of M coherent short pulses transmitted by a radar and received with a Doppler shift is considered, where the mth sample of the return at the video is represented by the complex process Zm.
Journal ArticleDOI
Methods for the measurement of vertical ionospheric motions near the magnetic equator by incoherent scattering
Ronald F. Woodman,T. Hagfors +1 more
TL;DR: Vertical ionospheric motions near magnetic equator measured by Doppler shifts of incoherent scatter frequency spectra were measured by doppler shift of coherent spectrum spectra.
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Numerical Comparison of Five Mean Frequency Estimators
Dale Sirmans,Bill Bumgarner +1 more
TL;DR: In this article, five techniques of estimating power spectrum mean frequency are examined: fast Fourier transform, covariance argument approximation, vector phase change, scalar phase change and time derivative form of covariance.