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Article #241Re: Polhemus ISOTRACK/3-SPACE and VIRTUAL REALITY
From: Brian Hanafee
Date: Fri, 17 Apr 1992 18:29
Date: Fri, 17 Apr 1992 18:29
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In article <1992Apr17.000653.4251@ee.ubc.ca> jthornto@ee.ubc.ca (Johan Thornton) writes: >In article <drues.703291186@pv320a.vincent.iastate.edu> drues@iastate.edu writes: >> >>The Isotrak gives location (x,y,z) AND orientation (pitch, roll, yaw) for >>a total of 6 degrees of freedom. I don't see how you could get all that >>using ultrasound (especially the 3 angles). >> >Actually, it's quite simple. Using three sound sources located sufficiently far apart >will tell you the object's location and orientation. And if you only need the >orientation of a plane, two sources are sufficient. The key difference with the Isotrak, an electromagnetic system, is that the three sources are co-located on different perpendicular axes. The sensor has the same arrangement (reciprocity applies). Thus, in each sampling cycle, nine measurements are taken to determine position and location. -- Brian Hanafee Advanced Decision Systems bhanafee@ads.com 1500 Plymouth Street (415) 960-7300 Mountain View, CA 94043-1230
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Newsgroups: comp.dsp,sci.engr.biomed,sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!think.com!ames!ads.com!saturn!bhanafee From: bhanafee@deimos.ads.com (Brian Hanafee) Subject: Re: Polhemus ISOTRACK/3-SPACE and VIRTUAL REALITY In-Reply-To: jthornto@ee.ubc.ca's message of Fri, 17 Apr 1992 00:06:53 GMT Message-ID: <BHANAFEE.92Apr17102901@deimos.ads.com> Sender: usenet@ads.com (USENET News) Organization: Advanced Decision Systems, Mountain View, CA 94043, +1 (415) 960-7300 References: <1992Apr7.031033.19729@njitgw.njit.edu> <drues.703291186@pv320a.vincent.iastate.edu> <1992Apr17.000653.4251@ee.ubc.ca> Date: Fri, 17 Apr 1992 18:29:01 GMT Lines: 21