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Wi-Fi fingerprint indoor positioning method low in complexity

An indoor positioning, low-complexity technology, applied in electrical components, wireless communication, network topology, etc., can solve the problems of signal time-varying, large positioning error, etc., to achieve the effect of low complexity

Active Publication Date: 2015-04-22
聊城来通国际贸易有限公司
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose a low-complexity indoor positioning method for the problem of relatively large positioning errors caused by time-varying signals in the Wi-Fi fingerprint indoor positioning system to reduce the number of Wi-Fi fingerprint indoor positioning systems. Computational Complexity of Matching Algorithms in Positioning and Improving Positioning Accuracy

Method used

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  • Wi-Fi fingerprint indoor positioning method low in complexity
  • Wi-Fi fingerprint indoor positioning method low in complexity
  • Wi-Fi fingerprint indoor positioning method low in complexity

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Embodiment Construction

[0022] Taking an indoor environment with a length and width of 60*30 as an example, the specific implementation steps of the floor discrimination algorithm provided by the present invention are described. The specific steps in the pre-deployment phase include the following:

[0023] Step (1): Establish a Cartesian coordinate system for the positioning area, such as figure 2 shown, and denoted as FP 1 (0,0), and then mark a sampling point every 3 meters, a total of 200 sampling points in the positioning area;

[0024] Step (2): Use a terminal with Wi-Fi function to detect the RSSI values ​​​​of the signal strengths of the five wireless access points AP at the first sampling point, that is, (-90, -85, -92, -86- 88), the unit is dBm, and the MAC address of the AP constitutes the sampling point location fingerprint FP, wherein the location fingerprint of the first sampling point FP m = ...

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Abstract

The invention discloses a Wi-Fi fingerprint indoor positioning method low in complexity and belongs to the field of Wi-Fi indoor positioning. In an indoor environment, the position of a terminal is determined by utilizing Wi-Fi signal intensity RSSIs, received by the terminal, of multiple APs and the direction of a magnetometer. In the fingerprint database building stage, a fingerprint database is built through a sampling and averaging method. In the real-time positioning stage, according to the direction of the terminal and the position of the terminal at the previous time, a fingerprint database subset is obtained for calculating the position, and the calculation complexity of a matching algorithm is reduced. Compared with a traditional fingerprint global matching algorithm, the Wi-Fi fingerprint indoor positioning method low in complexity can reduce the calculation complexity and improve the positioning precision.

Description

technical field [0001] The invention belongs to the field of wireless positioning, and in particular relates to a low-complexity indoor positioning method using Wi-Fi signals and built-in sensors of mobile terminals. Background technique [0002] In recent years, with the rapid development of wireless local area networks, mobile users have an increasing demand for real-time and accurate location information. Location-based services (LBS) and its applications have received constant attention and have broad market value. Existing LBS applications such as Dianping, WeChat, etc., they can recommend products and businesses according to people's location, and make friends in games. While these applications enrich our lives, they also make users have higher and higher requirements for location accuracy and real-time performance. The real-time location and accuracy of location are the key points of all location-based applications. At present, when the GPS satellite positioning that...

Claims

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Application Information

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IPC IPC(8): H04W64/00
CPCH04W64/00H04W84/12
Inventor 黎海涛齐双王奇
Owner 聊城来通国际贸易有限公司
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