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System and method for wifi positioning

A technology for determining location and predetermined threshold, applied in the field of Wi-Fi-based positioning system, which can solve the problems that cannot be incorporated into database consistency check

Inactive Publication Date: 2014-07-02
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the cost involved and the hassle of frequently downloading the database on the user's smartphone or personal computer, it is not always desirable
Therefore, if the user does not update the AP database frequently, the user cannot incorporate the consistency checks performed by the database vendor to improve the database from time to time

Method used

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  • System and method for wifi positioning

Examples

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Embodiment Construction

[0042] The present invention overcomes the problems encountered with conventional Wi-Fi communication systems by providing a solution at the user's site such that the method for determining the user's location is robust to outliers. Aspects of the invention provide reliable and accurate Wi-Fi positioning that is robust to low AP visibility issues and also to inaccurate AP locations in the database caused by moving APs.

[0043] Aspects of the invention provide a recursive centroid method to estimate a user's location. The method starts by computing the weighted centroids of all visible APs. The centroid of a plane figure or a two-dimensional shape X is the average (arithmetic mean) of all X points. As an example, the centroid is calculated by taking the average of all AP positions available from the AP database. In one example embodiment, the centroid calculation is weighted based on the RSSI from the AP. Finally, the distances of all visible APs are determined according to...

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Abstract

An aspect of the invention provides instantaneous Wi-Fi positioning that is robust to outliar APs using a recursive centroid method. It estimates user position and uncertainty based on the current list of scanned APs. Another aspect of the invention provides a Wi-Fi navigation solution that estimates good Wi-Fi positions even in the areas of low AP density and further improves robustness to outliar APs. Wi-Fi navigation solution improves the estimate of instantaneous Wi-Fi positioning by using a 4-state Kalman filter, which models user dynamics. As a result, the uncertainty estimate of the Wi-Fi positions is accurately estimated, thereby, making it suitable for blending with GNSS.

Description

technical field [0001] The present invention relates to Wi-Fi based positioning systems, in particular to Wi-Fi based positioning systems for location based services. Background technique [0002] Location-based services are an emerging field of mobile applications that exploit the ability of new devices to calculate and report their current geographic location to users or service agencies. Some examples of these services include identifying the location of people or objects in entertainment, work, health, or personal life environments. [0003] Wi-Fi is a mechanism that allows electronic devices to exchange data wirelessly over a computer network. Some technologies based on the IEEE 802.11 standard using Wi-Fi include Wireless Local Area Network (WLAN) and Wi-Fi Direct. A Wi-Fi enabled device such as a smartphone, personal computer, tablet or video game console can connect to a network resource such as the Internet via a wireless network access point (AP). An AP or hotsp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00G01S5/14H04W4/02H04W4/029
CPCH04W4/023H04W4/02H04W4/029G01S19/46
Inventor 斯坦纽纳坦·罗摩克里希南德里克·沃特斯
Owner TEXAS INSTR INC
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