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Real-Time Lock-In Amplifier Implementation Using a Kalman Filter for Quasi-Periodic Signal Processing in Fusion Plasma Diagnostics

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2 Author(s)
Coelho, R. ; Inst. de Plasmas e Fusao Nucl., Lisbon ; Alves, D.

The prospects for the real-time amplitude estimation of selected harmonic components of quasi-periodic signals from a motional Stark effect (MSE) tokamak plasma diagnostic is addressed using Kalman filtering techniques. The proposed method is shown to be more competitive than a standard low-pass filter lock-in amplifier scheme. In particular, when block data processing is limited to a small number of samples signal harmonics are narrowly separated in frequency or in the presence of frequency jitter, the superior competencies of the Kalman filtering method are evidenced.

Published in:

Plasma Science, IEEE Transactions on  (Volume:37 ,  Issue: 1 )

Date of Publication:

Jan. 2009

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