Positioning with wireless local area networks and WLAN-aided global positioning systems
First Claim
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1. A wireless device comprising:
- a wireless baseband configured to;
receive decoded global positioning system (GPS) data from one or more access points in a communication system;
a GPS baseband configured to;
identify a first GPS satellite based at least in part on the decoded GPS data;
acquire a first GPS signal from the first GPS satellite;
determine a first frequency offset of the first GPS signal based at least in part on a frequency difference between an oscillator frequency of the first GPS satellite and a receiver frequency of the wireless device; and
determine a frequency offset for one or more other GPS satellites based at least in part on the first frequency offset of the first GPS signal.
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Abstract
Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device can quickly determine its relative and/or coordinate position based on information provided by an access point in the WLAN. Before a wireless device disassociates with the access point, the WLAN can periodically provide time, location, and decoded GPS data to the wireless device. In this manner, the wireless device can significantly reduce the time to acquire the necessary GPS satellite data (i.e. on the order if seconds instead of minutes) to determine its coordinate position.
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Citations
18 Claims
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1. A wireless device comprising:
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a wireless baseband configured to; receive decoded global positioning system (GPS) data from one or more access points in a communication system; a GPS baseband configured to; identify a first GPS satellite based at least in part on the decoded GPS data; acquire a first GPS signal from the first GPS satellite; determine a first frequency offset of the first GPS signal based at least in part on a frequency difference between an oscillator frequency of the first GPS satellite and a receiver frequency of the wireless device; and determine a frequency offset for one or more other GPS satellites based at least in part on the first frequency offset of the first GPS signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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receiving, by a wireless baseband of a wireless device, decoded global positioning system (GPS) data from one or more access points in a communication system; identifying, by a GPS baseband of the wireless device, a first GPS satellite based at least in part on the decoded GPS data; acquiring a first GPS signal from the first GPS satellite; determining a first frequency offset of the first GPS signal based at least in part on a frequency difference between an oscillator frequency of the first GPS satellite and a receiver frequency of the wireless device; and determining a frequency offset for one or more other GPS satellites based at least in part on the determined frequency offset of the first GPS signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification