Results 11 to 20 of about 234,598 (330)

An Improved Time-Frequency Analysis Method for Instantaneous Frequency Estimation of Rolling Bearing

Shock and Vibration, 2018
Instantaneous frequency estimation of rolling bearing is a key step in order tracking without tachometers, and time-frequency analysis method is an effective solution.
Zengqiang Ma, Wanying Ruan, Mingyi Chen, Xiang Li   +3 more
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Direct Instantaneous Frequency Rate Estimation to Improve the Carrier Estimation Performance in Mars Entry, Descent, and Landing Flight

Remote Sensing, 2018
This paper focuses on the carrier estimation performance improvement in Mars entry, descent, and landing (EDL) flights. Carrier reconstruction could be used for trajectory derivation and Martian atmosphere profile inversion, and is the critical ...
Wanhong Hao, Xiaowei Cui, Jianguang Feng, Guangliang Dong, Zhiyong Zhu   +4 more
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Instantaneous Frequency Estimation Algorithm for Power Systems [PDF]

JES: Journal of Engineering Sciences, 2022
This paper deals with the problem of the Instantaneous Frequency (IF) estimation of power systems, to be adopted for example in Phasor Measurement Units (PMUs) used for monitoring, control, and protection.
Christina Aziz, Hany Girgis, Mohamed Nayel   +2 more
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Novel Method for Vibration Sensor-Based Instantaneous Defect Frequency Estimation for Rolling Bearings Under Non-Stationary Conditions

Sensors, 2020
It is proposed a novel instantaneous frequency estimation technology, multi-generalized demodulation transform, for non-stationary signals, whose true time variations of instantaneous frequencies are unknown and difficult to extract from the time ...
Dezun Zhao, Len Gelman, Fulei Chu, Andrew Ball   +3 more
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Instantaneous Frequency Estimation and Localization

, 2016
In many applications, a critical feature of a nonstationary signal is provided by its instantaneous frequency (IF), which accounts for the signal spectral variations as a function of time. This chapter presents methods and algorithms for the localization and estimation of the signal IF using timefrequency (t, f) based methods.
El-Jaroudi, A., Emresoy, M.K., Stanković, L.J., Hussain, Z.M., Boashash, B., O'Shea, P.J., Barkat, B., Sucic, V., Lerga, J., Rankine, L.J., Djurović, I., Simeunović, M., Djukanović, S., Ristic, B.   +13 more
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Fractional Synchrosqueezing Transformation and its Application in the Estimation of the Instantaneous Frequency of a Rolling Bearing

IEEE Access, 2020
The time-frequency energy distribution processed by a short-time Fourier transform can be compressed to the real instantaneous frequency by the synchrosqueezing transformation (SST), which improves the time-frequency energy concentration of the signal ...
Xin Li, Zengqiang Ma, Suyan Liu, Feiyu Lu   +3 more
doaj   +3 more sources

Refining instantaneous frequency estimation: Tackling abrupt transitions in aliased non-stationary signals

Franklin Open
Many real-life non-stationary signals, such as jammers or communication signals, exhibit abrupt transitions in instantaneous frequency. Estimating instantaneous frequencies of such signals is vital in applications involving interference mitigation in ...
Sadiq Ali, Nabeel Ali Khan
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Mechanical varying non-stationary signal separation method based on instantaneous frequency estimation

Advances in Mechanical Engineering, 2023
Mechanical equipment often works on variable speed condition, its corresponding vibration signal presents multi-component, modulation coupling with fast time-varying instantaneous frequency (IF), how to effectively compute IF and realize fasting varying ...
Lu Yan, Chen Qin-Xiao, Zhong Cheng, Tao Xian, Ding En-Jie, Liu Ke, Du Juan, Tong Xiao-Chun   +7 more
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Instantaneous Frequency Estimation Using Stochastic Calculus and Bootstrapping

EURASIP Journal on Advances in Signal Processing, 2005
Stochastic calculus methods are used to estimate the instantaneous frequency of a signal. The frequency is modeled as a polynomial in time. It is assumed that the phase has a Brownian-motion component. Using stochastic calculus, one is able to develop a
Abutaleb A
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Digital Filters for Instantaneous Frequency Estimation

, 2023
This technical note is on digital filters for the high-fidelity estimation of a sinusoidal signal's frequency in the presence of additive noise. The complex noise is assumed to be white (i.e. uncorrelated) however it need not be Gaussian. The complex signal is assumed to be of (approximately) constant magnitude and (approximately) polynomial phase such
Kennedy, Hugh Lachlan
openaire   +3 more sources