An Absolute Encoding Technology for Linear Displacement Measurement of Steel Tape Ruler
For steel tape rulers used for linear displacement measurement,although traditional m-sequence encoding and decoding schemes are suitable for long-distance measurement,there is a problem of excessive memory consumption of lookup tables.To address this issue,an m-sequence encoding and decoding scheme based on feature code matching was proposed.The influence of the initial coding state and feedback coeffi-cient required for designing m-sequences,as well as feature code selection on the longest computation times in decoding processes of non feature code were investigated.Furthermore,a design scheme based on practi-cal application scenarios was proposed,where selecting the optimal m-sequence and feature code can ensure decoding efficiency while minimizing memory.Finally,the effectiveness of the proposed scheme was verified through experiments.
absolute position encodingm-sequencefeature codesteel tape rulers