Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2007-11-06
2007-11-06
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
Reexamination Certificate
active
11112580
ABSTRACT:
Techniques for removing distortion in an AC magnetic tracker identify a characteristic frequency in the distortion environment which is then utilized to extract distortion components from the tracker receiver signals so that the corrected position and orientation can be calculated. A multiplicity of alternative techniques for determining this characteristic frequency are disclosed, several of which can be done during operation without interrupting system operation while others can be done off-line. The invention also allows the use of a tuned tracker transmitter since it does not need to operate at multiple frequencies. The invention differs from the prior art by treating an extended conductor characteristic as just another unknown. The position and orientation algorithm solves the 6 unknown coordinates of position and orientation plus the one more unknown—the extended conductor characteristic frequency. This enables the tracker to operate full time in one mode of operation without ever suspending normal operation and without additional hardware capabilities.
REFERENCES:
patent: 4287809 (1981-09-01), Egli et al.
patent: 4314251 (1982-02-01), Raab
patent: 4394831 (1983-07-01), Egli et al.
patent: 4737794 (1988-04-01), Jones
patent: 5453686 (1995-09-01), Anderson
patent: 5640170 (1997-06-01), Anderson
patent: 5645077 (1997-07-01), Foxlin
patent: 5752513 (1998-05-01), Acker et al.
patent: 5831260 (1998-11-01), Hansen
patent: 6172499 (2001-01-01), Ashe
patent: 6255933 (2001-07-01), Iwao
patent: 6288785 (2001-09-01), Frantz et al.
patent: 6528989 (2003-03-01), Hansen
patent: 2004/0207389 (2004-10-01), Nieminen et al.
Higgins Robert F.
Himberg Henry E.
Jones, Jr. Herbert R.
Alken Inc.
Barlow John
Gifford Krass Groh Sprinkle Anderson & Citkowski PC
Khuu Cindy
LandOfFree
Magnetic position and orientation measurement system with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic position and orientation measurement system with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic position and orientation measurement system with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3862866