A WiFi indoor positioning method based on anchor points and location fingerprints

An indoor positioning and anchor point technology, applied in wireless communication services, electrical components, wireless communication, etc., can solve problems such as low positioning accuracy, inability to complete positioning, and increased signal uncertainty, so as to achieve high positioning accuracy and make up for inadequacy Certainty, the effect of reducing errors

Active Publication Date: 2016-08-10
大晶信息化学品(徐州)有限公司
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AI Technical Summary

Problems solved by technology

However, in the application process of the existing WiFi positioning technology, it is found that the WiFi signal itself in many environments is unstable, and the signal is attenuated by walls and other buildings, which increases the uncertainty, resulting in low positioning accuracy in practical applications. It may even happen that the positioning cannot be completed

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  • A WiFi indoor positioning method based on anchor points and location fingerprints
  • A WiFi indoor positioning method based on anchor points and location fingerprints
  • A WiFi indoor positioning method based on anchor points and location fingerprints

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Embodiment Construction

[0025] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0026] figure 1As shown, 4 WiFi signal access points AP (labeled A to D) and 204 RPs (reference points) are placed in a two-dimensional square grid in an area of ​​8m*5.5m, and the lower boundary of the area is The x-axis, the left boundary is the y-axis, and the distance between two adjacent points in the direction of the two coordinate axes is 0.5m. Set an anchor point on the indoor ceiling to receive the signal strength. The anchor point is preferably set in the center of the ceiling (the ceiling here only refers to the same area corresponding to the area of ​​8m*5.5m). All APs are active RFID, the operating frequency is 2.442GHz, the sensitivity is -118dBm, ...

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Abstract

The invention discloses a WiFi indoor positioning method based on an anchor point and a position fingerprint recognition algorithm. The signal strength of the anchor point is used to correct the position fingerprint data, so that the position of the terminal receiver can be accurately positioned and the response is quick. The present invention uses the anchor point as the reference value for strength correction, which better corrects the instantaneous signal strength change and makes up for the uncertainty of the average value of the position fingerprint at a specific moment. It is obtained by using the KNN matching algorithm and the weight-based coordinate calculation method. The location of the point to be measured effectively reduces the error caused by signal fluctuations. In addition, using the point vectors to be measured to refine the vector set in the database can avoid the RSS vector misalignment caused by AP changes. The present invention has high positioning accuracy and rapid response, and is especially suitable for indoor position positioning of Android device terminals.

Description

technical field [0001] The invention belongs to the technical field of position positioning, and relates to a positioning method based on an indoor wireless network signal, and more specifically, relates to a precise positioning method capable of correcting a position according to an anchor point. Background technique [0002] Location information plays an important role in people's daily life. In unfamiliar environments such as suburbs, exhibition halls, and parks, the use of positioning and navigation information can provide more convenient services for visitors to visit; in the process of warehousing and logistics, real-time positioning and tracking of items will greatly improve work efficiency; Accurately grasping the location information of relevant personnel will help improve the level of security management and simplify prison management. At present, the Global Positioning System (GPS, Global Positioning System) is the most common way to obtain the location informati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/04H04W64/00
Inventor 马廷淮杨蓉储彬彬田伟钟水明
Owner 大晶信息化学品(徐州)有限公司
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