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Indoor passive positioning method based on geographic fingerprints

A passive positioning and fingerprinting technology, applied in electrical components, wireless communication and other directions, can solve the problem of insufficient indoor positioning and other problems

Active Publication Date: 2015-09-02
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the defect in the prior art that the indoor positioning is not accurate enough when the RSS value is non-Gaussian in a complex environment

Method used

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  • Indoor passive positioning method based on geographic fingerprints
  • Indoor passive positioning method based on geographic fingerprints
  • Indoor passive positioning method based on geographic fingerprints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] figure 2 It is a flow chart of the steps of the geographic fingerprint-based indoor passive positioning method provided in this embodiment.

[0046] First, when the mobile terminal is offline, use the access point device to collect the received signal strength value RSS of the mobile terminal at the reference point, and count the prior probability that the access point device collects the RSS value within a period of time (step S210).

[0047] Wi-Fi mobile terminals first need to discover surrounding wireless services through active / passive scanning, and then pass two processes of authentication and association before they can establish a connection with the AP and finally access the WLAN.

[0048] There are two ways for a Wi-Fi mobile terminal to obtain the surrounding wireless network information: one is passive scanning, the mobile terminal just listens to the Beacon (beacon frame) sent by the surrounding AP, which provides AP and RSS information, etc.; The other ...

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Abstract

The invention discloses an indoor passive positioning method based on geographic fingerprints. The method is applied to the technical field of indoor positioning and comprises: in a situation that a mobile terminal is in an off-line state, collecting a received signal strength (RSS) value of each reference point where the mobile terminal is by utilizing an access point device; calculating a prior probability that the access point device collects the RSS values in a period; establishing a geographic fingerprint database according to a coordinate position of each reference point, the RSS values and the prior probability; when the mobile terminal is in an on-line state, testing an RSS value of each test point where the mobile terminal is; matching the test points with reference points in the geographic fingerprint database based on a prior probability nearest neighbor algorithm according to the RSS value at each test point where the mobile terminal is; and determining the positioning position of the mobile terminal. According to the invention, the prior probability is applied to the K-nearest neighbor algorithm for positioning, and the positioning accuracy is improved at the same time and space complexity.

Description

technical field [0001] The invention relates to the technical field of indoor positioning, in particular to an indoor passive positioning method based on geographic fingerprints. Background technique [0002] With the development of location-based service technology, traditional indoor positioning systems such as GPS have been widely developed and used. Due to the weakness of the GPS signal indoors, it cannot be used in indoor positioning services. Therefore, a large number of indoor positioning technologies have emerged, such as radio frequency identification technology (RFID), Bluetooth technology (BlueTooth) and indoor WLAN positioning technology. With the development of wireless communication technology, wireless local area networks are widely deployed indoors. Therefore, low cost and low risk make indoor WLAN positioning technology the most mainstream technology at present. [0003] Existing WLAN networks usually use the nearest neighbor (Nearest Neighborhood, NN) cla...

Claims

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Application Information

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IPC IPC(8): H04W64/00
CPCH04W64/00
Inventor 陈昊张轶凡冯志勇杨雷崔琪楣杨旭虹刘哲
Owner BEIJING UNIV OF POSTS & TELECOMM
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