GPS and WLAN hybrid position determination
First Claim
1. A mobile device comprising:
- a global positioning system (GPS) receiver that receives GPS satellite signals;
a wireless local area network (WLAN) transceiver that measures WLAN access point signals; and
an environment profile sensor that calculates a Poor-to-Total Satellites Ratio (PTSR), wherein the PTSR is defined as a ratio of a total number of captured satellites and a number of captured satellites with a carrier-to-noise density below a threshold, to determine an environment area in which the mobile device is located, the environment profile sensor to;
register an outdoor area if the calculated PTSR is below a lower threshold;
register a shadow area if the calculated PTSR is between the lower threshold and an upper threshold; and
register an indoor area if the calculated PTSR is over the upper threshold.
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Accused Products
Abstract
The present disclosure provides a method for determining a real-time position of a mobile device using a global positioning system (GPS) and wireless local area network (WLAN) hybrid positioning mode. The method includes determining, by a mobile device, the mobile device'"'"'s environment area based on GPS satellite signals; determining an absolute position of the mobile device based on the GPS satellite signals while the mobile device is moving from an outdoor area to an indoor area; estimating a reference position of the mobile device based on the determined absolute position and WLAN access point signals while moving to a shadow area; and while moving to an indoor area, determining an estimated position of the mobile device based on calculated regressive coefficients and the WLAN access point signals, and updating the estimated position of the mobile device based on motion information and indoor floor map information.
22 Citations
31 Claims
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1. A mobile device comprising:
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a global positioning system (GPS) receiver that receives GPS satellite signals; a wireless local area network (WLAN) transceiver that measures WLAN access point signals; and an environment profile sensor that calculates a Poor-to-Total Satellites Ratio (PTSR), wherein the PTSR is defined as a ratio of a total number of captured satellites and a number of captured satellites with a carrier-to-noise density below a threshold, to determine an environment area in which the mobile device is located, the environment profile sensor to; register an outdoor area if the calculated PTSR is below a lower threshold; register a shadow area if the calculated PTSR is between the lower threshold and an upper threshold; and register an indoor area if the calculated PTSR is over the upper threshold. - 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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calculating, by an environment profile sensor, a Poor-to-Total Satellites Ratio (PTSR) based on global positioning system (GPS) satellite signals received by a mobile device, wherein the PTSR is defined as a ratio of a total number of captured satellites and a number of captured satellites with a carrier-to-noise density below a threshold; determining that the mobile device is in an outdoor area if the calculated PTSR is below a lower threshold; determining that the mobile device is in a shadow area if the calculated PTSR is between the lower threshold and an upper threshold; and determining that the mobile device is in an indoor area if the calculated PTSR is above the upper threshold.
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18. A method comprising
determining, by a global positioning system (GPS) position manager executed by one or more processors, an absolute position of a mobile device based on GPS satellite signals received by the mobile device as the mobile device moves from an outdoor area to an indoor area; -
calculating regressive coefficients of a linear regression formula using a least squares algorithm based on the determined absolute position and an estimated reference position; determining an estimated position of the mobile device based on the calculated regressive coefficients and wireless local area network (WLAN) access point signals received by the mobile device; and updating the estimated position of the mobile device based on motion information provided by a microelectromechanical systems (MEMS) sensor register and indoor floor map information provided by a map database as the mobile device moves to the indoor area. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification