What about a heavenly signal which is bumped 100 meter sideways, multipath faded, into the depths of the building, underground, skyscraper, mall or metro??
Vertical pico-GPS accuracy for business?? (obvious business to set up GPS-phantom-repeaters outside the restaurant, kind of like WLAN an bluetooth??)
Ilmarinen
My point is just that in these tough situations other aid is anyway needed, the same aid which works anyway where GPS doesn't.
Well, except being 0.5 mile off the lonely straight highway with only two marginal base stations within reach, but the ambulance can't drive there anyway, if it would, that road would lead somewhere and there would be a third base station there. |