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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting

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To: pheilman_ who wrote (23170)	5/30/2002 11:14:27 AM
From: rkral	Read Replies (1) of 196647

Re: E-OTD (Enhanced-Observed Time Difference) technology "The linear array of stations doesn't give additional information on the radius to the mobile." No radius information? Obtaining three radii for three BTSs (to the mobile's location) is exactly how the system works. There's a great graphic at the link below. "Visualize the mobile and both base stations as colinear. All this system can determine is which direction the mobile is from the base stations, it cannot make any statement about where the mobile is along the road .. " Actually, I believe the colinear case is the only case where two BTSs are "sufficient". Visualize two stations as 10 km apart. The E-OTD method shows the mobile to be 6 km from one BTS, and 4 km from the other. That's a fairly good statement of position. Of course, after accounting for measurement errors, the actual location could be quite some distance to either side of the road .. worst when the mobile is at the midpoint between BTSs, imho. A third colinear BTS, at a greater distance from the mobile than the first two BTSs, would be of no help. You've used the terms "linear array" and "direction". Seems to me you are thinking of E-OTD as a Loran-like technology. It's not. Ron cursor-system.com

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