Method and System for Estimating Positions Using Absolute Encoders
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United States of America Patent
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Sep 10, 2015
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Feb 7, 2012
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Abstract
A position is determined by sensing a signal corresponding to a subsequence of marks in a non-periodic sequence of the marks on a scale. A coarse position PA is determined by matching the subsequence with all possible subsequences of the non-periodic sequence. Threshold-crossings corresponding to rising edges of the signal and threshold-crossings corresponding to falling edges of the signal are detected. An position correction Pi is determined using the threshold-crossings. The coarse and the position correction are summed to obtain the position.
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