Patent ID: 7158752

Claim:
A communications method comprising the steps: continuously transmitting to a plurality of receivers in a target service area one or more data signals from a transmitters on a plurality of satellites deployed in a digital audio radio service network, said one or more data signals comprising a plurality of data channels, at least one of said data channels comprising at least one geographic specific information portion for locations in said target service area, said receivers having one or more probable locations in said target service area and having a constant or time-varying delay pattern for said one or more data signals; receiving said data signals at said receivers; continuously comparing said receivers' delay patterns for said one or more data signals with known delay patterns for a plurality of actual locations in said target service area that are delivered with said one or more data signals to said receiver; determining said receivers' actual or probable locations in said target service area from said comparing step; and selecting, in said receivers, and outputting from said receivers, said at least one geographic specific information portions for said locations.