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An Indoor Localization Method Based on Distance Measurement and Location Fingerprint

A technology for indoor positioning and distance measurement, which is used in measurement devices, mapping and navigation, instruments, etc., and can solve the problems of fingerprint matching interference and large positioning errors.

Active Publication Date: 2020-01-10
CHANGSHA UNIVERSITY
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Problems solved by technology

[0004] However, a non-negligible problem with this positioning method is that in the online phase, since there are fingerprints of reference points that are far away from the current location of the target in the offline fingerprint database, these irrelevant fingerprints may interfere with the fingerprint matching. resulting in large positioning errors

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  • An Indoor Localization Method Based on Distance Measurement and Location Fingerprint
  • An Indoor Localization Method Based on Distance Measurement and Location Fingerprint
  • An Indoor Localization Method Based on Distance Measurement and Location Fingerprint

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[0061] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0062] The overall idea of ​​the present invention is to propose an indoor positioning method based on distance measurement and location fingerprint (Indoor Localization Method based on Location Fingerprint and Range Measurement, referred to as ILLFRM), which includes two parts: an offline stage and an online stage. Among them, in the offline stage, the offline fingerprint library is constructed...

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Abstract

The invention discloses an indoor positioning method based on the distance measurement and position fingerprints. The indoor positioning method is characterized by comprising the following steps of deploying a plurality of reference points in an indoor region of interest; constructing a rectangular grid according to the positions of different reference points; constructing an ellipse with a WIFI transceiver as a focal point thereof and the dk (t) as a long axis thereof; according to the constructed ellipse, filtering all reference points in the rectangular grid, namely reserving reference points which fall within the coverage range of the ellipse, and obtaining a filtered reference point set; subjecting the filtered reference point set to fingerprint matching by adopting the k-nearest neighbor algorithm and according to an off-line position fingerprint map, and obtaining a matching result. According to the invention, before the fingerprint matching process, fingerprints irrelevant to the current position of a target in an off-line fingerprint database are filtered out through coarse positioning, so that the interference of irrelevant fingerprints is avoided. Therefore, the technical problem of the large positioning error during the existing passive fingerprint indoor positioning process, caused by the interference of irrelevant fingerprints on the fingerprint matching result, can be solved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to an indoor positioning method based on distance measurement and position fingerprint. Background technique [0002] With the rapid popularization of WiFi networks, WiFi-based indoor positioning technology has received widespread attention due to its low cost and easy implementation. Among them, WiFi-based passive fingerprint indoor positioning does not require any equipment to be positioned and has good non-invasiveness. , and gradually become a hotspot in the research of indoor positioning technology. [0003] Passive fingerprint indoor positioning generally includes two parts: an offline stage and an online stage. In the offline stage, corresponding signals are collected to build an offline fingerprint library; in the online stage, the online measured fingerprints are directly matched with all fingerprints in the offline fingerprint library to esti...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00G01C21/20
CPCG01C21/206H04W64/00H04W64/006
Inventor 彭小兵李方敏马小林刘凯栾悉道杨志邦
Owner CHANGSHA UNIVERSITY
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