Comments on: E-GPS Offers More Accurate Handset Locating

CPS (Cambridge Positioning Systems Ltd) today announced the launch of their new E-GPS (Enhanced Global Positioning System) technology – harnessing their Matrix technology to improve satellite-based location performance indoors and in busy city centres.
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OK ...

RhinoSteve @ 2/3/2005 2:06:33 PM # Q
So who is this good for? I don't want ads popping up on my Palm when I walk by a resturant that has a daily special.
RE: OK ...
Frenchie @ 2/3/2005 3:39:35 PM # Q
I think this is good for Palm GPS products such as the Garmin Ique. If i am not mistaken wasn't accurate GPS technology restricted because of the US defense department's fears that terrorists would use a GPS enabled device to guide missles?

The world will end in 2006. Just as it was predicted in the bible along with the release of Microsoft Longhorn.... :p
RE: OK ...
grahamnind @ 2/3/2005 5:27:17 PM # Q
Quote Frenchie "If i am not mistaken wasn't accurate GPS technology restricted because of the US defense department's fears that terrorists would use a GPS enabled device to guide missles?"

My understanding is that in the early days GPS wasn't accurate for the reason you state, but this was later changed, except around sesitive sites. e.g. military sites

RE: OK ...
T. @ 2/3/2005 5:57:37 PM # Q
It is called "Selective Availability". It is still under US control which is one of the reasons Europe is talking of their own system.

There are 24 sats (I think) in orbit. Although they could control specific satellites to control accuracy or availability in specific regions, it would be difficult to do it just around specific sites.

Related to accuracy, a company in Europe (Reelektronika) and the US (Megapulse) are using the old Loran-C infastructure (yes it is still running) o transmit GPS correction data from surveyed Reference Stations to their specialized receivers and are acheiving 2.5 meter accuracy. The receiver can also use calibrated Loran which pentetrates the "Urban Canyons" better than GPS (since it is low frequency, 100 Khz I think) for determining positions.

I know it is working at some of the stations in Europe and either is working or soon will be in Saudi Arabia.

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Forget LORAN/GPS, use mobile phone providers

Tamog @ 2/6/2005 6:58:36 AM # Q
Hi,
did you know about the triangle ping system already? The mobile phone provider has three sending devices ping your mobile phone and calculates the time that the ping took.
Then, from these ping times the position can easily be calculated by drawing distance circles around the towers. Where the three towers hit->position.
Best regards
Tam Hanna

Find out more about the Palm OS in my blog:
http://tamspalm.blogspot.com
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