Results 11 to 20 of about 34,299,079 (141)

THE TIME AND FREQUENCY CONTROL SUBSYSTEM ONBOARD NAVSTAR/GPS

open access: yes, 1984
International Telemetering Conference Proceedings / October 22-25, 1984 / Riviera Hotel, Las Vegas, NevadaThe commitment of the Global Positioning System (GPS) to use atomic clocks dates back more than ten years ago when the first major contractual ...
Hellwig, Helmut, Levine, Martin W.
core   +5 more sources

Temporal and Spatial Dynamics of Different Interictal Epileptic Discharges: A Time-Frequency EEG Approach in Pediatric Focal Refractory Epilepsy

open access: yesFrontiers in Neurology, 2020
Objective: Characterization of the spatial and temporal dynamics of interictal epileptic discharges (IED) using time-frequency analysis (TFA) and electrical-source localization (ESL).Methods: TFA was performed on IED (spikes, spike waves, and polyspike ...
Younes Jabran   +7 more
doaj   +1 more source

Time-Frequency Analysis of Systems with Changing Dynamic Properties [PDF]

open access: yes, 2006
The Wigner-Ville Distribution, and related refinements, represent a class of advanced time-frequency analysis tools that are distinguished from Fourier and wavelet methods by an increase in resolution in the time frequency plane. Time-frequency analysis
Bradford, Samuel Case, V   +1 more
core   +1 more source

A Method of DC Arc Detection in All-Electric Aircraft

open access: yesEnergies, 2020
Arc faults in an aircraft’s power distribution system (PDS) often leads to cable and equipment damage, which seriously threatens the personal safety of the passengers and pilots.
Teng Li, Zhijie Jiao, Lina Wang, Yong Mu
doaj   +1 more source

A Frequency Estimation Scheme Based on Gaussian Average Filtering Decomposition and Hilbert Transform: With Estimation of Respiratory Rate as an Example

open access: yesSensors, 2023
Frequency estimation plays a critical role in vital sign monitoring. Methods based on Fourier transform and eigen-analysis are commonly adopted techniques for frequency estimation.
Yue-Der Lin   +3 more
doaj   +1 more source

A Time–Frequency Analysis Perspective on Feynman Path Integrals

open access: yes, 2020
The purpose of this expository paper is to highlight the starring role of techniques from time–frequency analysis in some recent contributions concerning the mathematical theory of Feynman path integrals.
S. Ivan Trapasso, Trapasso S. I.
core   +1 more source

The residual forces generated by the (reserve) actuators at some joints of the subject-specific models of the two osseointegrated participants (OI-TFA-1 and OI-TFA-2).

open access: yes, 2023
The residual forces generated by the (reserve) actuators at some joints of the subject-specific models of the two osseointegrated participants (OI-TFA-1 and OI-TFA-2).
Vera G. M. Kooiman (9501365)   +2 more
core   +1 more source

Robust sparse time‐frequency analysis for data missing scenarios

open access: yesIET Signal Processing, 2023
Sparse time‐frequency analysis (STFA) can precisely achieve the spectrum of the local truncated signal. However, when the signal is disturbed by unexpected data loss, STFA cannot distinguish effective signals from missing data interferences.
Yingpin Chen, Yuming Huang, Jianhua Song
doaj   +1 more source

BrentLab/TFA-evaluation: TFA-evaluation

open access: yes, 2020
This release includes code for evaluating TFA inference results as described in the paper Inferring TF activities and activity regulators from gene expression data with constraints from TF perturbation data, Ma and Brent, 2020 Example input files are ...
czma
core   +1 more source

Deep learning-based LPI radar signals analysis and identification using a Nyquist Folding Receiver architecture

open access: yesDefence Technology, 2023
Nyquist Folding Receiver (NYFR) is a perceptron structure that realizes a low probability of intercept (LPI) signal analog to information. Aiming at the problem of LPI radar signal receiving, the time domain, frequency domain, and time-frequency domain ...
Tao Wan, Kai-li Jiang, Hao Ji, Bin Tang
doaj   +1 more source

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