Results 11 to 20 of about 4,476,448 (287)
Franklin OpenMany 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
doaj +2 more sources
INSTANTANEOUS FREQUENCY ESTIMATION USING A LEAST SQUARES TIME-FREQUENCY METHOD
Electrica, 2004 We present a method for estimating the instantaneous frequency of a signal. This method involves the calculation of a time-frequency energy density of the signal, then obtaining an instantaneous frequency estimation from this joint density.
Mahmut ÖZTÜRK, Aydın AKAN
doaj +3 more sources
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 +7 more
doaj +2 more sources
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 +3 more
doaj +2 more sources
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 +4 more
doaj +2 more sources
Leak detection using instantaneous frequency analysis [PDF]
, 2012 Leaking pipes are a primary concern for water utilities around the globe as they compose a major portion of losses. Contemporary interest surrounding leaks is well documented and there is a proliferation of leak detection techniques. Although the reasons
ghazali, mohd fairusham
core +6 more sources
MULTI-LAYERED CEPSTRUM FOR INSTANTANEOUS FREQUENCY ESTIMATION [PDF]
2018 IEEE Global Conference on Signal and Information Processing (GlobalSIP), 2018 In 2018 6th IEEE Global Conference on Signal and Information ...
Chin-Yun Yu, Li Su 0004
openaire +3 more sources
Power spectrum slope confounds estimation of instantaneous oscillatory frequency
NeuroImage, 2022 Oscillatory neural dynamics are highly non-stationary and require methods capable of quantifying time-resolved changes in oscillatory activity in order to understand neural function.
Jason Samaha, Michael X. Cohen
doaj +1 more source
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 +4 more
doaj +1 more source
Advances in Mechanical Engineering, 2020 An improved instantaneous frequency estimation algorithm for rotating machines based on a kernel-based fuzzy C-means clustering (KFCM) algorithm used in association with a spectral centroid algorithm is proposed in this study. The clustering algorithm is
Zhai Hua +4 more
doaj +1 more source