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Clinical factors linked to xylazine exposure in emergency department patients with illicit opioid overdose. [PDF]
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Compressive frequency-difference direction-of-arrival estimation
The Journal of the Acoustical Society of America, 2023Direction-of-arrival estimation is difficult for signals spatially undersampled by more than half the wavelength. Frequency-difference beamforming [Abadi, Song, and Dowling (2012). J. Acoust. Soc. Am. 132, 3018–3029] offers an alternative approach to avoid such spatial aliasing by using multifrequency signals and processing them at a lower frequency ...
Jeung-Hoon Lee +2 more
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Aliasing-free broadband direction of arrival estimation using a frequency-difference technique
The Journal of the Acoustical Society of America, 2021When the intersensor spacing of a uniform linear array (ULA) is larger than the half-wavelength of an incident narrowband signal, spatial aliasing is generated. For broadband signals, the broadband spatial spectrum is still affected as a result of the spatial aliasing in each frequency bin. In this paper, an aliasing-free broadband direction-of-arrival
Long Yang, Yong Wang, Yixin Yang
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The Journal of the Acoustical Society of America, 2022
In this paper, we consider the problem of bearing ambiguity in the direction of arrival (DOA) estimation due to spatial aliasing when the minimum wavelength of the processing broadband signal is less than the element spacing of a uniform linear array (ULA). First, an extended frequency-difference (FD) method is presented. Unlike the existing FD methods,
Xin Wang +4 more
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In this paper, we consider the problem of bearing ambiguity in the direction of arrival (DOA) estimation due to spatial aliasing when the minimum wavelength of the processing broadband signal is less than the element spacing of a uniform linear array (ULA). First, an extended frequency-difference (FD) method is presented. Unlike the existing FD methods,
Xin Wang +4 more
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The Journal of the Acoustical Society of America, 2007
Much research has been done in the area of estimating time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) and their use in locating a radiating source. Early work in this area focused on locating acoustic sources using passive sonar processing.
Mark L. Fowler, Xi Hu
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Much research has been done in the area of estimating time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) and their use in locating a radiating source. Early work in this area focused on locating acoustic sources using passive sonar processing.
Mark L. Fowler, Xi Hu
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Digital Signal Processing, 2015
The problem of jointly estimating time difference of arrival (TDOA) and frequency difference of arrival (FDOA) or Doppler has a variety of practical applications. The conventional cyclic ambiguity function and the fractional lower-order ambiguity function suffer performance degradation in the presence of non-Gaussian α-stable impulsive noise and ...
Yang Liu, Tianshuang Qiu, Jingchun Li
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The problem of jointly estimating time difference of arrival (TDOA) and frequency difference of arrival (FDOA) or Doppler has a variety of practical applications. The conventional cyclic ambiguity function and the fractional lower-order ambiguity function suffer performance degradation in the presence of non-Gaussian α-stable impulsive noise and ...
Yang Liu, Tianshuang Qiu, Jingchun Li
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Frequency difference of arrival accuracy
IEEE Transactions on Acoustics, Speech, and Signal Processing, 1989The problem considered occurs in the geolocation of a fixed emitter using observations from two moving collectors. Estimates for the time difference and frequency difference of signal arrivals are used. Frequency difference of arrival (FDOA) is estimated through the use of a mixing product.
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Distributed time and frequency difference of arrival tracking in clutter
2012 Workshop on Sensor Data Fusion: Trends, Solutions, Applications (SDF), 2012We consider passive surveillance using time and frequency difference of arrival signals received by mobile receiver pairs. Signals received by a pair of receivers are correlated in time and frequency, followed by a detection process. In addition to the target (emitter) measurements, we may also create a number of spurious detections in each scan.
Darko Musicki +2 more
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Relative Times of Arrival of Bursts of Solar Noise on Different Radio Frequencies
Nature, 1947It is becoming recognized that on metre wave, lengths solar noise from the disturbed sun is characterized by the occurrence of sudden large increases in intensity of a duration of several seconds or minutes. Bowen1, of this Laboratory, has reported that these increases of intensity are not necessarily coincident in time or shape when observed on ...
R, PAYNE-SCOTT +2 more
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Emitter position and velocity estimation given time and frequency differences of arrival
2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers, 2010Consider the problem of estimating the position and the velocity of an emitter given time and frequency differences of arrival acquired by a passive sensor array. By jointly eliminating the non-linear nuisance parameters of the model using an appropriate orthogonal projection, we obtain a least squares estimator of the parameters of interest.
Alon Amar +2 more
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