05-27-2003, 09:54 AM
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Join Date: 05-08-2003
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Location: Dewitt, NY
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1,490 |
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Re: Qualcomm GPSone
Quote:
Originally posted by "George Israel"
Here is a link to the technology
http://www.cdmatech.com/solutions/products/gpsone.html
My understanding is that it's more accurate than standard GPS because it adds in Cell towers in addition to standard GPS and wouldn't driving directions be considered location based services?
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No, it isn't more accurate at all. In order for it to be more accurate you would have to have a connection to at least 3 towers at once to triangulate your position, much like you have to receive a minimum of three satellites on a GPS receiver to triangulate your position. This may work in a dense urban area, but once you get into a suburban setting the likelyhood you're connected to three towers declines.
Even under most ideal conditions the accuracy isn't very impressive.
Quote:
• ACCURACY - gpsOne Technology Provides Highest Accuracy Fixes
- Works indoors, outdoors, in urban and rural settings
- Accuracy to within 5-10m* outdoors/20m** suburban/indoors
- GPS capability even inside large concrete structures
- Only GPS-capable solution with ability to fix indoors
- Greatest sensitivity (-155dBm)
- Degrades gracefully in harsh RF environments
* Clear sky, single fix; accuracy is dependent on RF environment and satellite signal path
**Wood frame, low-rise environment
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A WAAS capable GPS has accuracy to within 3 meters outdoors, and no GPS works reliably indoors, so once you take your cell phone in a mall or office building, any location data the phone is providing is strictly from the cell towers. They don't specifically mention what that accuracy figure is. 
Check out the GPSOnce Fact Sheet at cdmatech.com. __________________
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