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Nonlinear Adaptive Distortion-Free Denoising of Position Signal for Real-Time High-Dynamic Position Control in Manufacturing
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DOI：10.1109/tie.2026.3677635.png)
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Abstract
En 中文
High-precision position control of a motion stage is essential for manufacturing and relies on the real-time accurate position measurement. Reliable denoising position measurement signal is critical to enhance the signal-to-noise ratio (SNR) and reduce the measurement error. Frequent position adjustments of motion stages result in high-dynamic motion with step-like changes. Conventional real-time denoising techniques, including adaptive and nonadaptive techniques, cannot correctly track and follow these abrupt changes and will distort these changes. Feeding the distorted signal back to the position control system may lead to catastrophic consequences in manufacturing. This article proposes a nonlinear adaptive denoising method based on the quantization transform and the least mean square (QT+LMS) adaptive scheme. The method enables real-time denoising without distortions even at abrupt position changes and the denoised signal will immediately and accurately track and follow the abrupt changes in motion. Numerical analysis results show that, while the assumed displacement resolution is designated as 1 unitless, for signals with abrupt amplitude changes of 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup>, 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sup>, and 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> under a noise standard deviation (SD) of 100, the proposed method achieves an SNR improvement (SNRI) from 6.77 to 15.94 dB. The proposed method has been used in real-time displacement signal denoising for nanometer positioning and the noise level of the denoised signal was reduced by 1–2 orders of magnitude to deep sub-nanometer level.
Keywords:
Adaptive filter
motion stage
nonlinear filtering
position control
quantization transform (QT)
real-time denoising
Journal
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7.2
Papers:
1.8W
Citations:
9.8W
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