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lucas777 |
2010-06-18
, 09:34
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Posts: 738 |
Thanked: 179 times |
Joined on Mar 2010
@ Gold Coast, Australia
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#21
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WTF you guys must have dodgy gps then, as i get a lock on nokia maps pretty much instant on nokia maps and thats on 3g not wifi...
| The Following User Says Thank You to lucas777 For This Useful Post: | ||
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2010-08-16
, 16:18
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Posts: 30 |
Thanked: 10 times |
Joined on Jan 2010
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#22
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Originally Posted by 9000
No, they stopped doing that in 2000, that made the civilian GPS market viable. Thank Bill Clinton for that.
Because US adds noise to the reading for civilian GPS usage.
http://en.wikipedia.org/wiki/Global_Positioning_System
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2010-08-16
, 16:26
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Posts: 474 |
Thanked: 283 times |
Joined on Oct 2009
@ Oxford, UK
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#23
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Originally Posted by Soppa
Inside my house, GPS positions me on the opposite side of the road sometimes. That'll be about 30m away. That's proper GPS with a few satellites locked, according to the GPS diagnostic application. When it's only based on cell towers it's usually 300-500m off.
I think this is more related to the fact that the location was based only on A-GPS reading (estimate based on cell towers) and there was no real GPS satellite lock. A-GPS location is a really rough estimate.
Usually it's more accurate, but sometimes it does go quite far off. I've seen it occasionally when driving, too - the car is positioned off the side of the road, passing through houses
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2010-08-17
, 11:47
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Posts: 41 |
Thanked: 33 times |
Joined on Sep 2007
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#24
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Originally Posted by jjx
This is quite normal -- inside a building, you usually only get indirect signals that have been bounced once or several times, which will of course add delays. Since GPS uses signal timing to calculate your position, this will mess with the result.
Inside my house, GPS positions me on the opposite side of the road sometimes. That'll be about 30m away. That's proper GPS with a few satellites locked, according to the GPS diagnostic application. When it's only based on cell towers it's usually 300-500m off.
Originally Posted by jjx
GPS precision varies with a lot of factors. Read up on DOP (Dilution Of Precision) to get all the sordid details
Usually it's more accurate, but sometimes it does go quite far off. I've seen it occasionally when driving, too - the car is positioned off the side of the road, passing through houses
-- satellite constellation is one of them. If you drove the same route on a different time of day and/or another day a few weeks later, the reading might be spot on. This is where D-GPS (Differential GPS) comes in with receivers capable of it.Regards,
Chris.