Patent ID: 8019541

Claim:
A method comprising: receiving a real-time GPS data stream from a satellite in a first GPS satellite network; receiving a feed-forward data stream from a satellite in a second satellite network different from the first GPS satellite network, the feed-forward data stream containing feed-forward GPS data that is identical to real-time GPS data contained by the GPS data stream and wherein the feed-forward data stream was previously received at the second satellite network from a ground control station, the feed-forward data stream being received at a later time than the real-time GPS data stream; and processing, using a digital signal processor, the real-time GPS data stream and the feed-forward data stream, the processing including: extracting feed-forward GPS data bits from the feed-forward data stream; and supplementing the real-time GPS data with the extracted feed-forward GPS data bits, at least where the real-time GPS data is impaired due to missing or attenuated data bits in the real-time GPS data stream.