METHOD AND APPARATUS FOR PROCESSING A SATELLITE POSITIONING SYSTEM SIGNAL USING A CELLULAR ACQUISITION SIGNAL
First Claim
1. A method of processing satellite positioning system signals, comprising:
- receiving assistance data at a mobile receiver from a first wireless network using a wireless transceiver;
obtaining a time synchronization signal from a second wireless network at said mobile receiver using a wireless receiver;
determining a time offset in response to said time synchronization signal; and
processing satellite signals at said mobile receiver using said assistance data and said time offset.
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Accused Products
Abstract
Method and apparatus for processing satellite positioning system signals is described. In one example, assistance data is received at a mobile receiver from a first wireless network using a wireless transceiver. The first wireless network may be a non-synchronized cellular network. A time synchronization signal is obtained from a second wireless network at the mobile receiver using a wireless receiver. A time offset is then determined in response to the time synchronization signal. Satellite signals are processed at the mobile receiver using the assistance data and the time offset. The second wireless network may be a synchronized cellular network or may be a non-synchronized cellular network that is externally synchronized to GPS time.
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Citations
18 Claims
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1. A method of processing satellite positioning system signals, comprising:
- receiving assistance data at a mobile receiver from a first wireless network using a wireless transceiver;
obtaining a time synchronization signal from a second wireless network at said mobile receiver using a wireless receiver; determining a time offset in response to said time synchronization signal; and
processing satellite signals at said mobile receiver using said assistance data and said time offset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- receiving assistance data at a mobile receiver from a first wireless network using a wireless transceiver;
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9. A mobile receiver, comprising:
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a wireless transceiver for communicating with a first cellular network; a cellular acquisition receiver for receiving a time synchronization signal from a second wireless network; a satellite signal receiver for receiving satellite signals from satellite positioning system satellites; a local clock in communication with said satellite signal receiver; and a processor for determining a time offset between local time output by said local clock and satellite time output by said satellite positioning system satellites in response to said time synchronization signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A position location system, comprising:
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a server for providing assistance data; a mobile receiver, including; a wireless transceiver for communicating with said server through a first wireless network; a cellular acquisition receiver for receiving a time synchronization signal from a second wireless network; a satellite signal receiver for receiving satellite signals from satellite positioning system satellites; a local clock in communication with said satellite signal receiver; and a processor for determining a time offset between local time output by said local clock and satellite time output by said satellite positioning system satellites in response to said time synchronization signal. - View Dependent Claims (18)
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Specification