Indoor positioning method based on improved WKNN

A technology for indoor positioning and positioning points, which can be applied to services based on location information, services based on specific environments, wireless communications, etc., and can solve problems such as the impact of positioning accuracy

Active Publication Date: 2021-06-29
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]Aiming at the problems existing in the prior art, the present invention proposes an indoor positioning method that improves WKNN and reduces the influence of equipment heterogeneity ...

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  • Indoor positioning method based on improved WKNN
  • Indoor positioning method based on improved WKNN
  • Indoor positioning method based on improved WKNN

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment, as figure 1 Shown, the present invention comprises the steps:

[0072] 1) Divide the indoor scene into k positioning areas, and give labels 1, 2, 3...k;

[0073] 2) Carry out fence formation in each positioning area, establish a reference point, and record the position information of the reference point, for example, the coordinate of the i-th reference point is p i =(x i ,y i ), the RSS of the current reference point is collected by the mobile device every ΔT, and the RSS of the i-th reference point is recorded as: S i ={S i,1 ,S i ,2,...,S i,j ,...,S i,z}, where z is the number of wireless access points AP, s i,j Indicates the RSS of the jth wireless access point AP received by the ith reference point; S i,j ={S i,j,1 ,S i,j,2 ,...,S i,j,x ,...,S i,j,t}, t represents the number of acquisitions;

[0074] 3) Select a wireless access point...

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Abstract

The invention relates to an indoor positioning method based on improved WKNN, and the method comprises the following steps: fencing and determining reference points in a positioning area, selecting an AP set suitable for subsequent positioning according to RSS of APs collected in the reference points, and storing related data in a fingerprint database. recording RSS of an AP of a positioning point by using a portable device, judging a positioning area according to the same Mac address, selecting reference points similar to the numerical value change trend of the positioning point AP according to the quantity difference of wave crest and wave trough values between the positioning point and the reference points, selecting K reference points with the minimum Euclidean distance through a KNN algorithm, giving weights through normalization and a wasserstein distance, judging whether the reference points are similar reference points or not, giving weights, and obtaining a final result through weighted averaging.

Description

technical field [0001] The invention belongs to the field of indoor positioning, and in particular relates to an indoor positioning method for improving WKNN. Background technique [0002] At present, location-based services are divided into indoor positioning and outdoor positioning. In the field of outdoor positioning, GPS occupies a dominant position. With the emergence of Russia's GLONNASS satellite navigation system and China's Beidou satellite navigation system, outdoor positioning related technologies have become very mature. [0003] In the field of indoor positioning, according to the classification of its signal source, it can be divided into positioning technologies such as infrared, visible light, ultrasonic, ultra-wideband, Bluetooth, Zigbee, and WIFI. Among them, infrared, ultrasonic, and ultra-wideband technologies are expensive in hardware; visible light and Bluetooth technologies are greatly affected by environmental factors and are not easy to expand; Zigbe...

Claims

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Application Information

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IPC IPC(8): H04W4/02H04W4/33H04W4/021H04W64/00
CPCH04W4/023H04W4/33H04W4/021H04W64/006Y02D30/70
Inventor 王昌达赵显
Owner JIANGSU UNIV
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