Methods and systems for improving the accuracy of expected error estimation in location determinations using a hybrid cellular and WLAN positioning system

Inactive Publication Date: 2009-12-17
SKYHOOK WIRELESS
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AI Technical Summary

Problems solved by technology

Each of these approaches has its strengths and weaknesses depending upon the nature of the signals and measurements and the positioning algorithms employed.
However, if the travel time is not measured correctly, the error in the location estimate can be higher than WLAN PS, for example, on the order of hundreds of meters up to a kilometer.
These copies of the transmitted signal can arrive at slightly different times, and the selection of the signal which represents the distance between the mobile device and cell tower (or is the best estimate of distance) can be a challenge and an important part of the design of TOA based CPS.
In some embodiments, consistent measurements between the WLAN based location estimate and the cellular po

Method used

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  • Methods and systems for improving the accuracy of expected error estimation in location determinations using a hybrid cellular and WLAN positioning system
  • Methods and systems for improving the accuracy of expected error estimation in location determinations using a hybrid cellular and WLAN positioning system
  • Methods and systems for improving the accuracy of expected error estimation in location determinations using a hybrid cellular and WLAN positioning system

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Embodiment Construction

[0056]Embodiments of the disclosed subject matter provide a method of integrating a WLAN-based positioning system (WLAN PS) and a cellular-based positioning system (CPS) to create a hybrid positioning system. An integrated or hybrid system refers to a system which inputs the measurements and location estimates from one system to another system before location estimate to improve the accuracy of the positioning and velocity and bearing estimates, and the accuracy of expected error estimate, as compared to each individual system working independently. The method of integrating a WLAN PS and CPS to create a hybrid positioning system can add CPS final estimates as another input to WLAN PS and WLAN PS final estimations as another input to CPS. In one embodiment, raw CPS measurements and raw WLAN PS measurements also can be integrated to select the best set of measurement to increase the accuracy of position estimate and HPE.

[0057]FIG. 3 illustrates a block diagram of a hybrid system of a...

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Abstract

The present disclosure relates to systems and methods for improving the accuracy of expected error estimations in hybrid cellular and WLAN location determination. In some embodiments, the method can include providing a WLAN based location estimate and an expected error estimate for the WLAN based location estimate, providing a cellular based location estimate and an expected error estimate for the cellular based location estimate, and determining the expected error of the location determination by evaluating the consistency of the cellular based location estimate to the WLAN based location estimate. In some embodiments, the location estimate with the lower expected error can be selected as the location determination of the WLAN and cellular enabled device. In some embodiments, the consistency of the estimates can include the distance between the cellular based location estimate and the WLAN based location estimate.

Description

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Application Information

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Owner SKYHOOK WIRELESS
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