4MERRY R J E, VAN M J G de MOLENGRAFT, STEINBUCH M. Velocity and acceleration estima- tion for optical incremental encoders [-J~. Mecha- tronics, 2009,20 (2010) : 19-26.
5VERSCHUREN T A C. Extracting more accurate po- sition and velocity estimations using time stamping ~D~. Eindhoven University of Technology, 2006.
6WANGXQ,WUM, ZHUG, etal.. The error a- nalysis and harmonic wave correction o{ inductosyn EC]. 2nd International Asia Conference on Infor- matics in Control, Automation and Robotics, 2010 358-361.