Inertial orientation tracker having automatic drift compensation

Surgery – Diagnostic testing – Measuring anatomical characteristic or force applied to or...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

600587, 128897, A61B 5103

Patent

active

061621919

ABSTRACT:
A self contained sensor apparatus generates a signal that corresponds to at least two of the three orientational aspects of yaw, pitch and roll of a human-scale body, relative to an external reference frame. A sensor generates first sensor signals that correspond to rotational accelerations or rates of the body about certain body axes. The sensor may be mounted to the body. Coupled to the sensor is a signal processor for generating orientation signals relative to the external reference frame that correspond to the angular rate or acceleration signals. The first sensor signals are impervious to interference from electromagnetic, acoustic, optical and mechanical sources. The sensors may be rate sensors. An integrator may integrate the rate signal over time. A drift compensator is coupled to the rate sensors and the integrator. The drift compensator may include a gravitational tilt sensor or a magnetic field sensor or both. A verifier periodically measures the orientation of the body by a means different from the drift sensitive rate sensors. The verifier may take into account characteristic features of human motion, such as stillness periods. The drift compensator may be, in part, a Kalman filter, which may utilize statistical data about human head motion.

REFERENCES:
patent: 3786458 (1974-01-01), Horner et al.
patent: 4197855 (1980-04-01), Lewin
patent: 4800897 (1989-01-01), Nolsson
patent: 4928709 (1990-05-01), Allison et al.
patent: 5181181 (1993-01-01), Glynn
patent: 5192254 (1993-03-01), Young
patent: 5203346 (1993-04-01), Fuhr et al.
patent: 5373857 (1994-12-01), Travers et al.
patent: 5373858 (1994-12-01), Rose et al.
patent: 5425750 (1995-06-01), Moberg
patent: 5474088 (1995-12-01), Zaharkin et al.
patent: 5513651 (1996-05-01), Cusimano et al.
patent: 5615132 (1997-03-01), Horton et al.
patent: 5647375 (1997-07-01), Farfan De Los Godos
patent: 5807284 (1998-09-01), Foxlin
1 Watson Industries, Inc., Attitude and Heading Reference System #AHRS-C300A, Owner's Manual.
2 Gyration, Incorporated: An Overview of the Company, Technology, and Products.
3 K. Meyer, H.L. Applewhite and F.A. Biocca, "A Survey of Position Trackers," Presence, vol. 1, No. 22, Spring 1992, pp. 173-200.
4A. Lawrence, Modern Inertial Technology, Springer-Verlag, 1992, pp. 1-23.
5F.J. Ferrin, Survey of Helmet Tracking Technologies, SPIE vol. 1456, Large-Screen-Projection, Avionic, and Helmet-Mounted Displays, 1991, pp. 86-94.
6M. Friedman, T. Starner, A. Pentland, "Synchronization in Virtual Realities," MIT Media Lab Vision and Modeling Group Technical Report No. 157, Jan. 1991.
7J. Liang, C. Shaw and M. Green, "On Temporal-Spatial Realism in the Virtual Reality Environment," Proceedings of the ACM Symposium on User Interface Software and Technology, Nov. 13 -11, 1991, pp. 19-25.
8U.H. List, "Nonlinear Prediction of Head Movements for Helmet-Mounted Displays," Air Force Human Resources Laboratory, Technical Paper 83-45, Dec. 1983.
9M. Koifman and S.J. Merhav, "Autonomously Aided Strapdown Attitude Reference System," Journal of Guidance and Control, vol. 14, No. 6, 1991, pp. 1164-1172.
10 D. K. Bhatnagar, "Position Trackers for Head Mounted Display Systems: A survey," Mar. 29th, 1993.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Inertial orientation tracker having automatic drift compensation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Inertial orientation tracker having automatic drift compensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inertial orientation tracker having automatic drift compensation will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-267294

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.