Instantaneous frequency extraction of highly nonstationary optical interferometric signal using Reassigned Smoothed Pseudo Wigner Ville Distribution

Sur, Amit; Joshi, K. D.; Sharma, Archana; Kaushik, T. C.

doi:10.1016/j.ijleo.2021.166436

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…The IF can provide information about the demodulated rotation directions. For an acoustic introduced phase signal φ t = A sig sin (2π f sig t ), IFs f inst ( t ) can be written as follows[9, 12]:

\begin{equation} \def\eqcellsep{&}\begin{array}{*{20}{c}} {{f_{inst}}\ \left( t \right) = {f_c}\ + \frac{1}{{2\pi }}\ \frac{{d{\varphi _t}}}{{dt}} = {f_c}\ + {A_{sig}}{f_{sig}}\cos \left( {2\pi {f_{sig}}t} \right)} \end{array} \end{equation}

…”

Section: Introductionmentioning

confidence: 99%

“…Still, some applications require a dynamic range beyond the existing signal detection techniques [10]. The instantaneous frequency measurement (IFM) method has attracted attention in communication, radar, and shock physics systems [11,12]. IFM can increase dynamic range in several ways [13][14][15], which provides an inspiring alternative idea for heterodyne FOH's dynamic range extension.…”

mentioning

confidence: 99%

“…The IF can provide information about the demodulated rotation directions. For an acoustic introduced phase signal ϕ t = A sig sin (2π f sig t), IFs f inst (t) can be written as follows [9,12]:…”

mentioning

confidence: 99%

See 2 more Smart Citations

Dynamic range extension for heterodyne fibre‐optic hydrophone by using instantaneous frequency‐tracking method

Yang,

Zhang,

Wang

2023

Electronics Letters

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This letter proposes a novel dynamic range extension method using an instantaneous frequency (IF)‐tracking method for heterodyne fibre optic hydrophones (FOHs). IFs are used to compensate for large signal amplitudes in the demodulator. Theoretical analysis and simulation prove the effectiveness of the proposed algorithm. Simulation results achieve at least 19.76 dB dynamic range improvement, demonstrating great potential for extending FOHs for hydroacoustic detection and communication applications.

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\begin{equation} \def\eqcellsep{&}\begin{array}{*{20}{c}} {{f_{inst}}\ \left( t \right) = {f_c}\ + \frac{1}{{2\pi }}\ \frac{{d{\varphi _t}}}{{dt}} = {f_c}\ + {A_{sig}}{f_{sig}}\cos \left( {2\pi {f_{sig}}t} \right)} \end{array} \end{equation}

…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Dynamic range extension for heterodyne fibre‐optic hydrophone by using instantaneous frequency‐tracking method

Yang,

Zhang,

Wang

2023

Electronics Letters

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“…The frequency domain analysis method can accurately obtain the characteristic information for the steady-state signal of rotating machinery, but in the non-stationary state condition, time-frequency analysis (TFA) is an effective method for signal feature extraction. Many researchers have conducted extensive research on TFA, mainly including short-time Fourier transform (STFT), wavelet transform (WT) [2], Wigner-Ville analysis [3] methods, and so on.…”

Section: Introductionmentioning

confidence: 99%

On-Line Monitoring and Intelligent Diagnosis Technology of Rail Transit Ventilation System

Song¹

2023

Civil Engineering

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With the rapid development of economy and urbanization, subway has gradually become the main pillar of urban development. The ventilation system is the key guarantee of air quality in rail transit, and its condition monitoring and intelligent diagnosis are very important. The core problems of the complete set of a ventilation system required by the subway station have not been completely solved. The ventilation system includes the ventilator and additional equipment. The level of informatization and intelligence of the ventilation system and ventilator is not very high, and they have not yet been fully formed into an integrated diagnostic system. In view of the above two core issues, several scientific issues need to be tackled. This chapter studies the online monitoring and intelligent diagnosis mechanism of key equipment in the subway ventilation system. This mainly includes (1) modulation model of acoustic vibration signal; (2) noise reduction technology and feature extraction method; and (3) cases of multi-type typical fault identification fan equipment based on modulation model. Typical fault features were extracted respectively, which verified the effectiveness of the signal demodulation method for the diagnosis of rail transit ventilation systems.

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“…The Wigner-Vile distribution is a Fourier transform of an instantaneous signal [14], [15] and has many outstanding properties. Sur et al [16] proposed a smoothed pseudo-Wigner-Ville distribution method for extracting the instantaneous frequency of a highly non-stationary polynomial frequency-modulated fringe signal. Khare et al [17] proposed a smoothed pseudo-Wigner-Ville distribution technique to obtain the scalogram, spectrogram, and time-frequency representation plots of the EEG.…”

Section: Introductionmentioning

confidence: 99%

A Novel Empirical Variational Mode Decomposition for Early Fault Feature Extraction

2022

IEEE Access

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Early fault features of large-scale and low-speed mechanical equipment with heavy duty are weak and exhibit strong non-stationary characteristics. The adaptive extraction and identification of highly relevant important features from such signals has attracted significant attention. In this study, a novel empirical variational mode decomposition and exact Teager energy operator are proposed to explore valuable information. To highlight the fault impact signal representation, we use the exact energy operator to enhance the weak-impact components in the early fault signal. The proposed binary mechanism effectively distinguishes irrelevant features based on the adaptive decomposition parameter construction strategy. Therefore, interference features are easily removed from similar mixed signals, and the independent mode features are determined. The experimental results of the simulation and collected data are compared with those obtained with existing signal decomposition methods, and the superiority of the proposed method, owing to its better modal distinction and less time consumption, is verified.

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Instantaneous frequency extraction of highly nonstationary optical interferometric signal using Reassigned Smoothed Pseudo Wigner Ville Distribution

Cited by 8 publications

References 16 publications

Dynamic range extension for heterodyne fibre‐optic hydrophone by using instantaneous frequency‐tracking method

Dynamic range extension for heterodyne fibre‐optic hydrophone by using instantaneous frequency‐tracking method

On-Line Monitoring and Intelligent Diagnosis Technology of Rail Transit Ventilation System

A Novel Empirical Variational Mode Decomposition for Early Fault Feature Extraction

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