Indoor positioning method based on WiFi (Wireless Fidelity) fingerprints

An indoor positioning and fingerprint technology, applied in the field of indoor positioning based on WiFi fingerprints, can solve the problems of low positioning accuracy, difference in received signals, and low prediction accuracy
CN103402256AActive Publication Date: 2013-11-20WUHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN UNIV
Publication Date
2013-11-20

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Abstract

The invention discloses an indoor positioning method based on WiFi (Wireless Fidelity) fingerprints. The method comprises the steps of continuously acquiring RSSI (Received Signal Strength Indication) values of WiFi signals within a certain period of time for each known position point in a place to be positioned, preprocessing the acquired data, counting times num that each AP (Access Point) occurs in the signal sequence of a certain position point, deleting AP signal data with num which is smaller than half of the total length of the sequence, calculating the average value mu and the standard deviation delta of the preprocessed data, and storing the average value mu and the standard deviation delta in a database; and acquiring the RSSI values of the WiFi signals at a point to be positioned, uploading the RSSI values to a sever, matching the acquired data of the point to be positioned with values in the database by adopting a multilevel probability algorithm to obtain W position estimation values with the maximum probability and performing time averaging to obtain the position estimation of the point to be measured. Compared with the prior art, the method has the advantages that the positioning accuracy is guaranteed, the operability and the practicability of the system are improved, and the goal of accurate positioning at distance of 3m can be achieved.
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Description

technical field

[0001] The invention belongs to the technical field of indoor positioning, and in particular relates to an indoor positioning method based on WiFi fingerprints. Background technique

[0002] A WiFi wireless network consists of an access point (AP) and a wireless network card. The AP is generally in a fixed position, and the signal it transmits contains information such as the global unique identifier of the hotspot, the network name, and the encryption method. By scanning, the mobile terminal can obtain the ID of the nearby hotspot, the name of the network, and the RSSI (Received Signal Strength Indication) of the location of the terminal.

[0003] At present, most of the general-purpose WiFi indoor positioning technologies are based on IEEE802.11b / g protocol wireless local area network (WLAN) signal strength positioning technology, which are mainly divided into geometric measurement method and position fingerprint positioning method. The relative principle ...

Claims

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