On Wed, 20 Jul 2005, Alex Rubenstein wrote:
GPS does not work through the fuselage of a aluminum airplane.
I've tried. More than once.
The gps carrier frequency is 1575.42mhz a decent gps antenna is unfortunately a bit larger than most small gps recivers let alone cellphones. multipath cancelation is a serious issue when dealing with gps, and being in a aluminum tube mailer, under tree cover or inside commercial construction doesn't help your situation when all you have is a tiny patch antenna printed on a pcb.
On Wed, 20 Jul 2005 Michael.Dillon@btradianz.com wrote:
If a person is calling 911 from a plane in flight, are we really so concerned about which PSAP receieves the call? The last known fix would likely have been the point of origin in any case...
If a picocell on board an airplane receives an E911 call, it shouldn't route it to any PSAP. The first responders in this situation are the flight attendants so it should ring the flight attendant's phone.
By the way, if GPS works in the air for small aircraft pilots, then why wouldn't it work for cellphones? The last known fix should be 100% up to date and 100% useless.
--Michael Dillon
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