Patent ID: 7574215

Claim:
A positioning information distribution system comprising: a plurality of satellite data receiving stations receiving data from at least one satellite in a positioning system and performing a plurality of satellite specific operations comprising: extracting satellite information, calculating differential correction data relative to its own position, and transmitting satellite specific data including said satellite information and said differential correction data via a data link for each satellite in said positioning system from which data was received; an information processing station coupled with said data link, said information processing station receiving a plurality of said satellite specific data transmissions from each of said plurality of satellite data receiving stations, conjoining said plurality of satellite specific data transmissions into a data file comprising satellite information and differential correction data for a plurality of said satellites in said positioning system, and distributing said data file via a network; and a mobile unit including a positioning system receiver and a data processing unit, said mobile unit accessing said network and receiving said data file without providing any location information to said information processing station, said mobile unit selecting a portion of said data file correlating to satellites being in line-of-sight of said mobile unit and utilizing said portion of said data file to assist in computing a measured position of said mobile unit.