POSITION DETERMINATION USING A WIRELESS SIGNAL
First Claim
1. A method comprising:
- determining with satellite positioning system enhanced dead reckoning an estimated position of a mobile station and a corresponding dead reckoning confidence level;
receiving wireless signals from a plurality of access points;
determining at least one of a received signal strength indicator and a round trip time for the wireless signals; and
improving the estimated position of the mobile station based on the dead reckoning confidence level and the at least one of a received signal strength indicator and a round trip time for the wireless signals.
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Accused Products
Abstract
A mobile station determines its position using measured parameters of a wireless signal to improve a satellite positioning system (SPS) enhanced dead reckoning based position estimate. The mobile station uses SPS enhanced dead reckoning to estimate a current position. The mobile station receives wireless signals and measures, e.g., received signal strength and/or round trip time, which is compared to a database to derive a wireless signal based position estimate. The SPS enhanced dead reckoning position estimate and the wireless signal based position estimate may then be fused using corresponding confidence levels. The database may be generated and stored in the mobile station. In another embodiment, the database is generated and stored on an online server that may be accessed by mobile stations.
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Citations
58 Claims
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1. A method comprising:
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determining with satellite positioning system enhanced dead reckoning an estimated position of a mobile station and a corresponding dead reckoning confidence level; receiving wireless signals from a plurality of access points; determining at least one of a received signal strength indicator and a round trip time for the wireless signals; and improving the estimated position of the mobile station based on the dead reckoning confidence level and the at least one of a received signal strength indicator and a round trip time for the wireless signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A mobile station comprising:
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a satellite positioning system receiver that provides positioning data; at least one sensor providing dead reckoning data; a wireless transceiver that receives and transmits wireless signals; a processor connected to the satellite positioning system receiver to receive positioning data, the at least one sensor to receive dead reckoning data, and the wireless transceiver; memory connected to the processor; and software held in the memory and run in the processor to determine an estimated position and corresponding confidence level based on the positioning data and the dead reckoning data, the software further controls the processor to determine at least one of a received signal strength indicator and round trip time for wireless signals received by the wireless transceiver and improve the estimated position using the confidence level and at least one of the received signal strength indicator and round trip time. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A mobile station comprising:
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means for determining an estimated position and corresponding confidence level of a mobile station using satellite positioning system enhanced dead reckoning; means for receiving wireless signals; means for determining at least one of a received signal strength indicator and a round trip time for the wireless signals; and means for improving the estimated position of the mobile station based on the confidence level and at least one of a received signal strength indicator and a round trip time for the wireless signals. - View Dependent Claims (31, 32, 33)
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34. A computer-readable medium including program code stored thereon, comprising:
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program code to estimate a position and a corresponding confidence level based on satellite position system enhanced dead reckoning; program code to determine at least one of a received signal strength indicator and round trip time for wireless signals; and program code to improve the estimate of the position using the confidence level and at least one of the received signal strength indicator and round trip time. - View Dependent Claims (35, 36, 37)
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38. A method comprising:
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receiving from at least one mobile station measurements for wireless signals and estimated positions for the measurement locations of the measurements for the wireless signals; estimating distances between access points for the wireless signals and the estimated positions for the measurement locations using a channel model; estimating the positions of the access points for the wireless signals based on the estimated distances and the estimated positions for the measurement locations; and storing the estimated positions of the access points for the wireless signals in a database. - View Dependent Claims (39, 40, 41, 42, 43, 44)
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45. A system comprising:
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means for receiving from at least one mobile station measurements for wireless signals and estimated positions for the measurement locations of the measurements for the wireless signal; means for estimating distances between access points for the wireless signals and the positions for the measurement locations using a channel model; means for estimating the position of access points for the wireless signals based on the estimated distances and the positions for the measurement locations; and means for storing the estimated positions of the access points for the wireless signals in a database. - View Dependent Claims (46, 47, 48, 49, 50, 51)
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52. An apparatus comprising:
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a wireless transceiver that receives and transmits wireless signals, the wireless transceiver receives from at least one mobile station measurements for wireless signals and estimated positions for the measurement locations of the measurements for the wireless signals; a processor connected to the wireless transceiver; memory connected to the processor; and software held in the memory and run in the processor to estimate distances between access points for the wireless signals and the positions for the measurement locations;
estimate the position of the access points for the wireless signals based on the estimated distances and the positions for the measurement locations; and
store the estimated positions of the access points for the wireless signals in the memory. - View Dependent Claims (53, 54, 55)
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56. A computer-readable medium including program code stored thereon, comprising:
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program code to estimate distances between access points for wireless signals and the positions for the measurement locations based on measurements of wireless signals and estimated positions for the measurement locations associated with the measurements for the wireless signals; program code to estimate the positions of the access points for the wireless signals based on the estimated distances and the positions for the measurement locations; and program code to store the estimated positions of the access points for the wireless signals in the memory. - View Dependent Claims (57, 58)
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Specification