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Antialiasing Encoder Interface With Sub-Nyquist Sampling

A technique is presented for reconstructing absolute position or angle from time-sampled outputs of incremental encoders. Unlike existing techniques, the new method is able to track analog quadrature outputs with frequency contents higher than the Nyquist frequency. The algorithm is described in det...

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Published in:	IEEE transactions on instrumentation and measurement 2006-12, Vol.55 (6), p.2029-2033
Main Authors:	Buckner, Z.D., Reed, M.L., Aylor, J.H.
Format:	Article
Language:	English
Subjects:	Actuators Algorithms Circuits Coders Encoder Encoders Frequency High speed Hydraulic actuators Instrumentation Nyquist Phase measurement Position measurement quadrature reconstruction Sampling Sampling methods Sensor phenomena and characterization Shafts Signal resolution Testing Tracking
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description	A technique is presented for reconstructing absolute position or angle from time-sampled outputs of incremental encoders. Unlike existing techniques, the new method is able to track analog quadrature outputs with frequency contents higher than the Nyquist frequency. The algorithm is described in detail, and both the existing and new methods are tested using a linear position sensor and a high-speed hydraulic actuator. The results from these tests demonstrate aliasing and incorrect tracking for the existing algorithm and correct tracking for the new algorithm. The technique is an excellent complement to resolution-enhancing encoder interfaces that sample raw analog encoder outputs
doi_str_mv	10.1109/TIM.2006.884285
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subjects	Actuators Algorithms Circuits Coders Encoder Encoders Frequency High speed Hydraulic actuators Instrumentation Nyquist Phase measurement Position measurement quadrature reconstruction Sampling Sampling methods Sensor phenomena and characterization Shafts Signal resolution Testing Tracking
title	Antialiasing Encoder Interface With Sub-Nyquist Sampling
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