Method and apparatus for determining time for gps receivers

摘要

The invention concerns a method for aiding the determination of a position of a mobile global positioning system (GPS) receiver which is coupled to a cellular communication receiver, said method comprising: monitoring transmissions of a cellular communications signal from a cellular communication cell site by an entity not co-located with said mobile gps receiver; determining by said entity a time-of-day of at least a portion of said transmissions and determining a specific cell site associated with said portion; and determining a position information of said mobile GPS receiver from said time-of-day and said specific cell site. The invention also concerns a system for aiding the determination of a position of a mobile global positioning system (GPS) receiver which is couple to a cellular communication receiver.