GPS device
First Claim
1. A device comprising:
- a first circuit arranged to receive at least one first signal and arranged to output first timing information dependent on said first signal;
a second circuit arranged to receive at least one a second signal and arranged to output second timing information dependent on said second signal; and
a third circuit arranged to determine timing information of said device, said third circuit arranged to receive at least one of said first and second timing information, and further arranged to produce a third timing information dependent on at least one of said received first and second signals,wherein said third circuit is farther arranged to produce a location estimate dependent on said first and third timing information;
wherein said third timing information is initially synchronised to said first timing information and maintained substantially synchronised to said at least one first signal using said second timing information; and
wherein said third circuit further comprises a cellular reference clock and wherein said third timing information is further maintained substantially synchronized to said at least one first signal using said cellular reference clock.
2 Assignments
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Accused Products
Abstract
A GPS device comprising: a first circuit arranged to receive at least one first signal and arranged to output first timing information dependent on the first signal; a second circuit arranged to receive at least one second signal and arranged to output second timing information dependent of the second signal; and a third circuit arranged to determine timing information of the device. The third circuit is arranged to receive at least one of the first and second timing information, and further arranged to produce third timing information dependent on at least one of the first and second signals. The third circuit further is arranged to produce a location estimate dependent on the first and third timing information. The third timing information is initially synchronized to the first timing information and maintained substantially synchronized to the at least one first signal using the second timing information.
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Citations
23 Claims
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1. A device comprising:
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a first circuit arranged to receive at least one first signal and arranged to output first timing information dependent on said first signal; a second circuit arranged to receive at least one a second signal and arranged to output second timing information dependent on said second signal; and a third circuit arranged to determine timing information of said device, said third circuit arranged to receive at least one of said first and second timing information, and further arranged to produce a third timing information dependent on at least one of said received first and second signals, wherein said third circuit is farther arranged to produce a location estimate dependent on said first and third timing information; wherein said third timing information is initially synchronised to said first timing information and maintained substantially synchronised to said at least one first signal using said second timing information; and wherein said third circuit further comprises a cellular reference clock and wherein said third timing information is further maintained substantially synchronized to said at least one first signal using said cellular reference clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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receiving at least one first signal; producing first timing information dependent on said at least one first signal; receiving at least one second signal; producing second timing information dependent on said at least one second signal;
producing third timing information dependent on said at least one of said first and second timing information;initially synchronising said third timing information to said first signal, maintaining synchronisation to said first signal using said second timing information, and further maintaining synchronization to said first signal using said cellular reference clock, and determining a location of said device dependent on said first timing information and said third timing information, wherein said determining step comprises the step of calculating a difference between said third timing information and said first timing information to determine location estimates. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification