Patent ID: 8570216

Claim:
A system for providing differential corrections for positioning, the system comprising: a roving reference device (RRD) that is aware of its geographic location via a first position-finding system, the RRD comprising: a RRD receiver for receiving a signal from at least one transmission source associated with a second position-finding system, wherein the RRD is aware of a location of the at least one transmission source, a RRD clock for collecting a first measurement of the signal, a RRD memory for storing the first measurement, a RRD processor for processing the first measurement, the location of the RRD, and the location of the at least one transmission source to generate differential correction information, a RRD transmitter for transmitting a differential correction information signal that includes the differential correction information; and a receiving device (RD) comprising: a RD first receiver for receiving the signal from the at least one transmission source, wherein the RD is aware of the location of the at least one transmission source, a RD clock for collecting a second measurement of the signal, a RD memory for storing the second measurement, a RD second receiver for receiving the differential correction information signal from the RRD, a RD processor for processing the differential correction information, the second measurement, and the location of the at least one transmission source to generate a location estimate for the RD.