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To: JohnG who wrote (5859)	1/29/2000 5:59:00 PM
From: RocketMan	Respond to of 13582

So, what is so special about Snap Track GPS. Those of us who have used GPS know it is line of sight. It doesn't work inside glass and steel buildings because of signal attinuation or in city concrete canyons because of attinuatuon and reflection. Well, it turns out that Snap Track's patented CDMA does work in these extreme situations because it operates well despite signal attinuation and reflections. Thanks for the reference, but that still leaves me a bit confused. I don't understand what "Snap Track's patented CDMA" does for GPS. GPS just broadcasts framed timing signals in L-band, there is no multiplexing going on. Maybe the CDMA they refer to is the cueing that they would do to transmit some of the ephemeris information to the cellulars via CDMA, but the phones would still have to receive the direct GPS L-band signal to do positioning. So I just don't understand how they deal with attenuation and reflections inside buildings. Can any comm engineers on the thread help me understand?