System and method for providing assistance data within a location network

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, the method comprising:

• a) processing Global Navigation Satellite System (GNSS) signals at a positioning-unit device to determine assistance data including the time-of-arrival of Global Navigation Satellite System (GNSS) signals relative to said synchronized network time;
• 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;
• 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.

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 frequency, the method comprising:

• a) processing Global Navigation Satellite System (GNSS) signals at a positioning-unit device to determine assistance data including 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 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 frequency.