METHOD AND APPARATUS FOR RECEIVING A GLOBAL POSITIONING SYSTEM SIGNALUSING A CELLULAR ACQUISITION SIGNAL
First Claim
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2. A method for receiving a Global Positioning System (GPS) signal to a GPS handheld device, comprising:
- obtaining a time synchronization burst from a cellular network;
determining a timing offset responsive to the time synchronization burst; and
determining a time of day responsive to the timing offset for receiving the GPS signal without having to have a subscription to the cellular network.
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Abstract
Method and apparatus for a GPS device that uses at least one cellular acquisition signal is described. More particularly, a GPS device is configured to receive at least one cellular acquisition signal for obtaining benefits associated with AGPS with only a small subset of AGPS circuitry to interact with a cell phone network. This facilitates use of GPS devices without subscription to a cell phone service provider, thus avoiding cellular subscription fees.
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Citations
41 Claims
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2. A method for receiving a Global Positioning System (GPS) signal to a GPS handheld device, comprising:
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obtaining a time synchronization burst from a cellular network;
determining a timing offset responsive to the time synchronization burst; and
determining a time of day responsive to the timing offset for receiving the GPS signal without having to have a subscription to the cellular network. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. A method for determining position of a Global Positioning System (GPS) handheld device in proximity to a cellular basestation of a cellular network, comprising:
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obtaining at least one of location information and identification information from the cellular basestation; and
determining a position estimate of the GPS handheld device responsive to the at least one of location information and identification information without having to have fee-based access to the cellular network. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A Global Positioning System (GPS) mobile device, comprising:
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at least one antenna;
a cellular acquisition signal front end couple to the at least one antenna to receive a cellular acquisition signal;
a GPS signal front end coupled to the at least one antenna to receive a GPS signal;
a GPS/cellular processor coupled to the GPS front end and to the cellular acquisition front end, the GPS/cellular processor is configured with a GPS baseband processor in electrical communication with the GPS front end and a cellular acquisition signal baseband processor in electrical communication with the cellular acquisition signal front end;
a reference oscillator coupled to the GPS/cellular processor;
a general purpose processor coupled to the cellular acquisition signal baseband processor and to the GPS baseband processor; and
memory coupled to the general-purpose processor. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for receiving a Global Positioning System (GPS) signal, comprising:
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obtaining a frequency correction burst from a cellular network;
determining a frequency offset responsive to the frequency correction burst; and
determining a window of frequency search responsive to the frequency offset for receiving the GPS signal without having to transmit a cellular signal to the cellular network.
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26. A method for receiving a Global Positioning System (GPS) signal to a GPS handheld device, comprising:
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obtaining a time synchronization burst from a cellular network;
determining a timing offset responsive to the time synchronization burst; and
determining a time of day responsive to the timing offset for receiving the GPS signal without having to transmit a cellular signal to the cellular network. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. A method for determining position of a Global Positioning System (GPS) handheld device in proximity to a cellular basestation of a cellular network, comprising:
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obtaining at least one of location information and identification information from the cellular basestation; and
determining a position estimate of the GPS handheld device responsive to the at least one of location information and identification information without having to transmit a cellular signal to the cellular network. - View Dependent Claims (1, 35, 36, 37, 38, 39, 40, 41)
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39-1. The method of claim 34 wherein the identification information is a cell identifier.
Specification