Adaptive Doppler bio-signal detector and time-frequency representation based on non-Liènard oscillator.
adaptive stopping oscillations
blood velocity profile
chaotic intermittence
non-Liènard oscillator
time-frequency analysis
Journal
International journal for numerical methods in biomedical engineering
ISSN: 2040-7947
Titre abrégé: Int J Numer Method Biomed Eng
Pays: England
ID NLM: 101530293
Informations de publication
Date de publication:
22 Nov 2023
22 Nov 2023
Historique:
revised:
04
10
2023
received:
11
07
2023
accepted:
01
11
2023
medline:
22
11
2023
pubmed:
22
11
2023
entrez:
22
11
2023
Statut:
aheadofprint
Résumé
The work presented here provides the guidelines and results for designing and implementing a highly sensitive modified Van der Pol - Duffing oscillator with a trigonometric damping function (VTD). This VTD can exhibit periodic and quasi-chaotic behavior necessary for application in weak signal detection. Here, we present two proposals: (1) A method based on a quasi-chaotic intermittent array (ANLIOA), whose all VTD parameters are calculated and fine-tuned toward a critical state between chaotic and periodic state through a Lyapunov exponent procedure, and (2) A method based on a single oscillator in an adaptive stopping oscillation system (ANLSOS), where VTD is established within an oscillatory regime. Both systems can detect non-stationary signals while reconstructing the time-frequency spectrogram in high resolution within severe noise conditions. The systems were adapted for the detection of a synthesized Doppler signal corresponding to the blood flow velocity profile from an artery. Comparative results using typical oscillators such as Duffing or Van der Pol demonstrate the superiority of the VTD oscillator in detection when used for both methods, whose mean absolute percentage error reached around 6% for a signal-to-noise ratio (SNR) of -10 dB. Furthermore, compared to other time-frequency methods, ANLIOA and ANLSOS promise high precision in detecting Doppler signals with low rates of frequency changes while minimizing energy emission and avoiding possible bio-thermal effects.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e3794Subventions
Organisme : Mexican Council for Humanities, Sciences, and Technologies
ID : 331405
Informations de copyright
© 2023 John Wiley & Sons Ltd.
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