Patent ID: 7466264

Claim:
A method for providing assistance to a position receiver in a location system consisting of a Global Navigation Satellite System (GNSS) and a synchronized network of positioning-unit devices, said synchronized network of positioning-unit devices providing synchronized network time and synchronized network frequency, the method comprising: a) processing Global Navigation Satellite System (GNSS) signals at a positioning-unit device to determine assistance data, including: i) the time-of-arrival of Global Navigation Satellite System (GNSS) signals relative to said synchronized network time, and; ii) the frequency of Global Navigation Satellite System (GNSS) signals relative to said synchronized network frequency; b) incorporating said determined assistance data in a positioning signal transmitted by said positioning unit device; c) analyzing said positioning signal at said position receiver to: i) extract said determined assistance data, and ii) determine said synchronized network time and said synchronized network frequency; d) searching for Global Navigation Satellite System (GNSS) signals at said position receiver in a range responsive to said extracted assistance data, and said determined synchronized network time and said synchronized network frequency.