Results 31 to 40 of about 75,899 (299)

Instantaneous frequency estimation using the cross Wigner-Ville distribution with application to nonstationary transient detection [PDF]

, 1990
: A method based on an iterative procedure incorporating time-frequency distributions (TFDs) is proposed for instantaneous frequency (IF) estimation of rapidly time-varying signals.
Boashash, Boualem, O'Shea, Peter J.
core   +1 more source

A Novel Strategy for Signal Denoising Using Two-Layer SVD and Its Application to Rub-Impact Fault Diagnosis of Aeroengine

Applied Sciences, 2022
The rub-impact fault, which occurs in the aeroengine, can cause frequency modulation (FM) in its vibration signal. Oscillated instantaneous frequency (IF) is a phenomenon of such a modulation mode, which carries critical fault information from the ...
Peng Zhang, Shunming Li, Kun Xu, Siqi Gong, Keyi Zhan, Maoxian Shen, Jun Tian, Xin Yuan   +7 more
doaj   +1 more source

Parameterized Instantaneous Frequency Estimation Method for Vibration Signal with Nonlinear Frequency Modulation

Machines, 2022
The vibration signal from the rotatory machinery condition monitoring under time-varying speed is usually amplitude-modulated (AM) and frequency-modulated (FM).
Yuexin Huang, Qiukun Zhang, Jianfeng Zhong, Zhixiong Chen, Shuncong Zhong   +4 more
doaj   +1 more source

Using Differential Geometry to Revisit the Paradoxes of the Instantaneous Frequency

IEEE Open Access Journal of Power and Energy, 2022
This paper proposes a general framework to interpret the concept of Instantaneous Frequency (IF) in three-phase systems. The paper first recalls the conventional frequency-domain analysis based on the Fourier transform as well as the definition of IF ...
Federico Milano, Georgios Tzounas, Ioannis Dassios, Mohammed Ahsan Adib Murad, Taulant Kerci   +4 more
doaj   +1 more source

Mobile unit velocity estimation in microcellular systems using the ZCR of the instantaneous frequency of the received signal [PDF]

, 2003
This paper presents a new estimator for the velocity of a mobile station in microcellular systems. The proposed estimator is based on the zero-crossing rate of the instantaneous frequency of the received signal.
B. Senadji, Azemi, G., Boashash, Boualem, B. Boashash, Boashash, B., G. Azemi, Senadji, B., Senadji, Bouchra, Azemi, Ghasem   +8 more
core   +1 more source

Estimation of instantaneous frequency in the presence of interfering trajectories [PDF]

, 2020
The paper presents a method for the estimation of instantaneous frequency (IF) of signals characterized by interfering IF trajectories. It would be a useful methodology for maintenance and troubleshooting of wireless networks sharing the same operating ...
Capasso F., de Alteriis G., Schiano Lo Moriello R., Tocchi A., Angrisani L., Ruggiero D.   +5 more
core   +1 more source

A combination of genetic inversion and seismic frequency attributes to delineate reservoir targets in offshore northern Orange Basin, South Africa

Open Geosciences, 2020
The reported occurrence of Albian- and Cenomanian-aged braided fluvio-deltaic channels in the Orange Basin, South Africa, opens a window of exploration activities to characterize these channels as they are renowned to form some of the world’s giant oil ...
Samakinde Chris Adesola, van Bever Donker Jan Marinus, Fadipe Oluwaseun Adejuwon   +2 more
doaj   +1 more source

Mobile unit velocity estimation based on the instantaneous frequency of the received signal [PDF]

, 2004
This paper presents a new mobile station velocity estimator based on the first moment of the instantaneous frequency (IF) of the received signal. The effects of shadowing, additive noise, and scattering distribution on the proposed velocity estimator are
Azemi, G., Boashash, Boualem, Boashash, B., Senadji, B., Senadji, Bouchra, Azemi, Ghasem   +5 more
core   +1 more source

A New Approach for Estimation of Instantaneous Mean Frequency of a Time-Varying Signal [PDF]

, 2022
Analysis of nonstationary signals is a challenging task. True nonstationary signal analysis involves monitoring the frequency changes of the signal over time (i.e., monitoring the instantaneous frequency (IF) changes). The IF of a signal is traditionally
Sridhar Krishnan (14025273)
core   +1 more source

Practical Instantaneous Cable Tension Estimation for Monitoring of Cable-Stayed Bridges

Applied Sciences
This study proposes a practical framework for estimating instantaneous stay-cable tension in cable-stayed bridges based on the first-order frequency moment (FFM).
Jungwook Seo, Changsu Shim, Jongchil Park   +2 more
doaj   +1 more source