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Probability locating method and locating device based on WLAN

A positioning method and positioning device technology, applied in the direction of electrical components, wireless communication, etc., can solve the problems of difficult accurate positioning and poor universality, and achieve the effect of improving accuracy and good universality

Inactive Publication Date: 2014-07-09
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, the inventors found that the existing probability-based methods mainly determine the prior probability of each reference point for the user's personal historical location records. Therefore, the existing probability-based methods are not suitable for users who lack historical location records, and the universality is poor

Method used

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  • Probability locating method and locating device based on WLAN
  • Probability locating method and locating device based on WLAN
  • Probability locating method and locating device based on WLAN

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An embodiment of the present invention is a probabilistic positioning method based on WLAN, the flow chart is as follows figure 1 shown, including:

[0030] 101. Acquire location fingerprints of at least two reference points in an area to be positioned, and acquire a set of measured signals of points to be positioned by a terminal in the area to be positioned.

[0031] Multiple reference points can be set in the area to be positioned. The location fingerprints may be collected during an offline measurement phase. The location fingerprint includes information such as the MAC address, signal strength, and standard deviation of the visible access point, and may also include the visibility of the access point. In this step, the terminal detects the signal of the access point at the point to be located to obtain a measured signal set, and the measured signal set includes information such as the MAC address and signal strength of the visible access point.

[0032] 102. Acc...

Embodiment 2

[0038] An embodiment of the present invention is a probabilistic positioning method based on WLAN, the flow chart is as follows figure 2 shown, including:

[0039] 201. Acquire location fingerprints of at least two reference points in an area to be positioned, and acquire a set of measured signals of points to be positioned by a terminal in the area to be positioned.

[0040] The location fingerprints may be collected during an offline measurement phase. The location fingerprint includes information such as MAC addresses, signal strengths, and standard deviations of visible access points. The area to be positioned may be an indoor area or an outdoor area. In this step, the terminal detects the signal of the access point at the point to be located to obtain a measured signal set, and the measured signal set includes information such as the MAC address and signal strength of the visible access point.

[0041] 202. According to the access points included in the location finge...

Embodiment 3

[0086] This embodiment further describes the present invention in conjunction with specific application scenarios.

[0087] Such as image 3 As shown, APs are arranged indoors 1 ~AP 6 Six access points, in order to simplify the description process, the following only set L 1 and L 2 Two reference points are used as examples for illustration.

[0088]First, in the offline measurement stage, respectively, in L 1 and L 2 The signal samples of all visible AP nodes are collected at the two reference points, and the RF fingerprint library F={F(L 1 ), F(L 2 )}, assuming that the location fingerprints are:

[0089] F ( L 1 ) = mac 1 - 66 2.7 0.87 ...

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Abstract

The invention discloses a probability locating method based on a WLAN. The probability locating method based on the WLAN comprises the steps that position fingerprints of at least two reference points in an area to be located are obtained, and an actual measurement signal set of points to be located of a terminal in the area to be located is obtained; according to the actual measurement signal set and the position fingerprints, the matching degrees of the actual measurement signal set and the position fingerprints are obtained, and serve as prior probabilities of the reference points; according to the prior probabilities of all the reference points, the probabilities of all the points to be located at all the reference points are obtained through calculation through a Bayes criterion probability method; the reference point corresponding to the maximum probability value is selected as the locating point of the locating terminal. The probability locating method based on the WLAN can solve the problem of locating deviation brought by the incomplete matching of the actual measurement signal set and the position fingerprints, the accuracy of a traditional probability locating method can be improved effectively, historical locating records are not relied on in the whole locating point judging process, and the universality is good.

Description

technical field [0001] The present invention relates to the technical field of wireless positioning, in particular to a probabilistic positioning method and positioning device based on WLAN. Background technique [0002] At present, Location Based Services (LBS) is gradually becoming one of the mobile Internet value-added services with the most market prospect and development potential. Typical LBS services include finding surrounding people and resources, recommending points of interest, traveling navigation, meeting guides, etc. [0003] With the widespread deployment of wireless local area network (WLAN) hotspots indoors in offices, residential quarters, hospitals, airports, shopping centers, etc., and in mobile terminal devices such as PDAs, notebooks, netbooks, MP4, and Support, WLAN-based indoor positioning technology has gradually attracted people's attention. Since the WLAN indoor positioning technology makes full use of the existing wide-coverage wireless local ar...

Claims

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Application Information

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IPC IPC(8): H04W64/00
Inventor 李莉丁强
Owner HUAWEI TECH CO LTD