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RSS and CSI integrated indoor positioning method based on WiFi signal

An indoor positioning and signal technology, applied in the direction of location information-based services, specific environment-based services, wireless communication, etc., can solve problems such as difficult positioning accuracy and lack of positioning, and achieve the effect of reducing redundancy

Inactive Publication Date: 2019-06-28
NORTHWEST NORMAL UNIVERSITY
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Problems solved by technology

However, in some cases, CSI is more susceptible to the impact of dynamic environments than RSS, so it is difficult for traditional indoor positioning systems based on CSI or RSS to achieve relatively high positioning accuracy in real environments. There is a lack of solutions for integrating CSI and RSS for indoor positioning

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  • RSS and CSI integrated indoor positioning method based on WiFi signal
  • RSS and CSI integrated indoor positioning method based on WiFi signal
  • RSS and CSI integrated indoor positioning method based on WiFi signal

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Embodiment Construction

[0057] The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0058] see figure 1 , figure 2 and image 3 , provide a kind of indoor positioning method based on WiFi signal fusion RSS and CSI, comprising the following steps:

[0059] S1: Select a reference point, collect CSI and RSS information of the reference point including reference coordinates, WiFi signal feature value fingerprint feature data, preprocess the fingerprint feature data, and establis...

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Abstract

The invention discloses an RSS and CSI integrated indoor positioning method based on a WiFi signal, and the method comprises the steps: collecting CSI and RSS information of reference points which comprises reference coordinates and WiFi signal characteristic value fingerprint characteristic data, carrying out the preprocessing of the fingerprint characteristic data, and building a fingerprint database; collecting fingerprint characteristics of a test point, and roughly estimating the position based on a kNN algorithm according to the RSS information in the fingerprint database; roughly estimating the test coordinates of the test point, calculating the Euclidean distance between the test coordinates and the reference coordinates according to a rough estimation result, arranging the Euclidean distance from small to large, and selecting and screening the reference points according to a set radius; constructing a sub-fingerprint database from the screened reference points selected according to the rough estimation result; calculating the similarity between the fingerprint measurement value of the test point and the sub-fingerprint database, and calculating the weight according to thefingerprint characteristics of the test point, the sub-fingerprint database and the similarity; and accurately estimating the position coordinates of the test point through a weighted average method.Positioning errors are reduced, and positioning precision is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of indoor positioning, and in particular to an indoor positioning method based on WiFi signals integrating RSS and CSI. Background technique [0002] At this stage, Bluetooth, infrared, RFID (Radio Frequency Identification), visible light, WiFi and other technologies are usually used for indoor positioning research. Among them, positioning methods based on Bluetooth and infrared require expensive equipment, and the transmission distance is small, which is not suitable for large-scale commercial applications; RFID is limited by power and can only be used for short-distance positioning; when the light source is blocked, visible light positioning will be affected. Therefore, visible light positioning becomes impossible; WiFi positioning technology is a research hotspot at present, and many positioning methods based on WiFi are gradually proposed. WiFi positioning mainly adopts the fingerp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/029H04W4/33H04W4/80H04W64/00
Inventor 郝占军李彩霞邵晨光唐续豪党小超李焱
Owner NORTHWEST NORMAL UNIVERSITY
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