TR2017-157

Speed Estimation for Contactless Electromagnetic Encoders


    •  Wang, P., Orlik, P.V., Wang, B., Sadamoto, K., Tsujita, W., Sawa, Y., "Speed Estimation for Contactless Electromagnetic Encoders", IEEE Industrial Electronics Society (IECON), DOI: 10.1109/​IECON.2017.8216565, October 2017.
      BibTeX TR2017-157 PDF
      • @inproceedings{Wang2017oct3,
      • author = {Wang, Pu and Orlik, Philip V. and Wang, Bingnan and Sadamoto, Kota and Tsujita, Wataru and Sawa, Yoshitsugu},
      • title = {{Speed Estimation for Contactless Electromagnetic Encoders}},
      • booktitle = {IEEE Industrial Electronics Society (IECON)},
      • year = 2017,
      • month = oct,
      • doi = {10.1109/IECON.2017.8216565},
      • url = {https://www.merl.com/publications/TR2017-157}
      • }
  • MERL Contacts:
  • Research Area:

    Signal Processing

Abstract:

This paper considers speed estimation for contactless electromagnetic (EM) encoder system with a moving readhead and spatially periodic placed reflectors. We first introduce a new signal model to capture reflected signals from these spatially periodic placed reflectors. Then an instantaneous phase-based speed estimator is proposed by using the phase unwrapping technique followed by a nonlinear least square method for motion-related parameters. The proposed speed estimator is verified by 1) Monte-Carlo simulations to confirm its statistical efficiency as the numerical mean squared errors approach to corresponding Cramer-Rao bounds and 2) a semi-analytical dataset by accounting for real system specificaltions such as the antenna beampattern, 3-dB beamwidth, and noise.