| Topic: |
Science > Physics |
| User: |
"Robert11" |
| Date: |
24 Aug 2007 01:42:04 PM |
| Object: |
Cel-Phone GPS ? |
Hi,
Just curious about the navigation and position mapping functions apparently
built into my new cel- phone.
Using Verizon.
Is there a "true" GPS receiver built into the phone, or is your position
determined by some sort of triangulation from several of the nearby cel
towers ?
Or,...?
Thanks,
Bob
.
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| User: "Randy Poe" |
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| Title: Re: Cel-Phone GPS ? |
24 Aug 2007 02:04:23 PM |
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On Aug 24, 2:42 pm, "Robert11" <rgs...@notme.com> wrote:
Hi,
Just curious about the navigation and position mapping functions apparently
built into my new cel- phone.
Using Verizon.
Is there a "true" GPS receiver built into the phone, or is your position
determined by some sort of triangulation from several of the nearby cel
towers ?
Something in between?
http://www.travelbygps.com/articles/tracking.php
"accurate location determination requires the assistance of the
wireless network..."
I've been involved with some studies using "triangulation" (actually
it's the SNR information, not direction) to locate transmitters. It's
not that difficult. But apparently carriers decided it would be easier
to have the phones have at least some GPS capability
on-board rather than solve the problem with the towers.
- Randy
.
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| User: "Sam Wormley" |
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| Title: Re: Cel-Phone GPS ? |
24 Aug 2007 04:47:42 PM |
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Robert11 wrote:
Hi,
Just curious about the navigation and position mapping functions apparently
built into my new cel- phone.
Using Verizon.
Is there a "true" GPS receiver built into the phone, or is your position
determined by some sort of triangulation from several of the nearby cel
towers ?
A gps receiver (chip) is a gps receiver. Ephemeris data is supplied
by cell tower networks so that the GPS receiver (chip) can get a position
fix in a few seconds as required for 911 calls mandated by the FCC.
.
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