Method and apparatus for receiving a global positioning system signal using a cellular acquisition signal
First Claim
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1. A method, comprising:
- obtaining a time synchronization signal from a cellular network at a global positioning system (GPS) handheld device without a subscription to the cellular network using a front end only capable of receiving signals from said cellular network;
determining a timing offset responsive to the time synchronization signal;
determining a time of day responsive to the timing offset without having to have a subscription to the cellular network; and
processing satellite trajectory data within the GPS handheld device using the time of day.
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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
16 Claims
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1. A method, comprising:
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obtaining a time synchronization signal from a cellular network at a global positioning system (GPS) handheld device without a subscription to the cellular network using a front end only capable of receiving signals from said cellular network;
determining a timing offset responsive to the time synchronization signal;
determining a time of day responsive to the timing offset without having to have a subscription to the cellular network; and
processing satellite trajectory data within the GPS handheld device using the time of day. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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obtaining a time synchronization signal from a cellular network without transmitting a cellular signal to the cellular network using a front end only capable of receiving signals from said cellular network;
determining a timing offset responsive to the time synchronization signal;
determining a time of day responsive to the timing offset; and
processing satellite trajectory data within the GPS handheld device using the time of day. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification