System and Method for Estimating Positioning Error Within a WLAN-Based Positioning System
First Claim
1. In a WLAN positioning system for estimating the position of a WLAN-enabled device, a method of estimating an expected error of a position estimate, a method comprising:
- the WLAN-enabled device receiving signals transmitted by at least one WLAN access point in range of the WLAN-enabled device;
estimating the position of the WLAN-enabled device based on the received signals from the at least one WLAN access point in range of the WLAN enabled device;
measuring a signal strength value for the signals transmitted by the at least one WLAN access point;
determining a maximum signal strength value for the measured signal strength values; and
estimating an expected error of the position estimate based on the maximum signal strength value of the signals transmitted by the at least one WLAN access point in range of the WLAN enabled device, wherein the expected error predicts a relative accuracy of the position estimate.
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Abstract
The invention features a method of estimating an expected error of a position estimate for use in a WLAN positioning system that estimates the position of a WLAN-enabled device. The WLAN-enabled device receives signals transmitted by at least one WLAN access point in range of the WLAN-enabled device, and a position of the WLAN-enabled device is estimated based on the received signals from the at least one WLAN access point in range. A signal strength value is measured for the signals transmitted by the at least one WLAN access point, and a maximum signal strength value is determined. The method also estimates an expected error of the position estimate based on the maximum signal strength value of the signals transmitted by the at least one WLAN access point in range of the WLAN enabled device. The expected error predicts a relative accuracy of the position estimate.
178 Citations
16 Claims
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1. In a WLAN positioning system for estimating the position of a WLAN-enabled device, a method of estimating an expected error of a position estimate, a method comprising:
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the WLAN-enabled device receiving signals transmitted by at least one WLAN access point in range of the WLAN-enabled device; estimating the position of the WLAN-enabled device based on the received signals from the at least one WLAN access point in range of the WLAN enabled device; measuring a signal strength value for the signals transmitted by the at least one WLAN access point; determining a maximum signal strength value for the measured signal strength values; and estimating an expected error of the position estimate based on the maximum signal strength value of the signals transmitted by the at least one WLAN access point in range of the WLAN enabled device, wherein the expected error predicts a relative accuracy of the position estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a WLAN positioning system for estimating the position of a WLAN-enabled device, a system for estimating an expected error of a position estimate, the system for estimating the expected error comprising:
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a WLAN-enabled device for receiving signals transmitted by at least one WLAN access point in range of the WLAN-enabled device; a computer readable medium comprising instructions that, when executed, cause a computer system to; estimate the position of the WLAN-enabled device based on the received signals from the at least one WLAN access point in range of the WLAN enabled device; measure a signal strength value for the signals transmitted by the at least one WLAN access point; determine a maximum signal strength value for the measured signal strength values; and estimate an expected error of the position estimate based on the maximum signal strength value of the signals transmitted by the at least one WLAN access point in range of the WLAN enabled device, wherein the expected error predicts a relative accuracy of the position estimate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification