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...

Full description

Saved in:
Bibliographic Details
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
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2006.884285