A method of improving the resolution and accuracy of rotary encoders using a code compensation technique
Nobumi Hagiwara, Yoshihisa Suzuki, Hideaki Murase · IEEE Transactions on Instrumentation and Measurement · 1992
A method of improving the resolution and accuracy of incremental type rotary encoders using a phase encoding and code compensation system is described. Applying this system to an optical incremental encoder whose scale pitch is 1/3600 rotation, results in a resolution of up to 1/920000 rotation, and better than +or-1/300000 rotation (+or-0.0012 degrees ) precision is obtained.>