Method and apparatus for determining time for GPS receivers
First Claim
Patent Images
1. 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.
0 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus of determining the time for a global positioning system receiver is disclosed. Timing signals derived from a communication system, such as cellular phone transmission signals, are received by a GPS receiver and decoded to provide accurate time information. The timing signals may be in the form of synchronized events marked by timing indicators, or as system time information. The timing signals in combination with satellite position signals received by the GPS receiver are used to determine the position of the GPS receiver.
302 Citations
14 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6)
transmitting said time-of-day to said mobile GPS receiver.
-
-
7. 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
transmitting a representation of said time-of-day to said mobile GPS receiver. - View Dependent Claims (8, 9, 10, 11)
-
-
12. A system for aiding the determination of a position of a mobile global positioning system (GPS) receiver which is coupled to a cellular communication receiver, said system comprising:
-
a receiver coupled to an antenna, said receiver monitoring transmissions of a cellular communications signal from a cellular communication cell site by a first entity not co-located with said mobile GPS receiver;
a processor coupled to said receiver, said processor determining by said first entity a time-of-day of at least a portion of said transmissions and determining a specific cell site associated with said portion; and
a transmitter coupled to said processor, said transmitter transmitting a representation of said time-of-day to a second entity in order to determine a position of said mobile GPS receiver. - View Dependent Claims (13, 14)
-
Specification