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Terminal difference eliminating method in indoor positioning technology based on signal intensity

An indoor positioning and signal strength technology, applied in positioning, wireless communication, measuring devices, etc., can solve the problems of reducing the universality of the positioning system and the error of positioning results, so as to eliminate equipment differences, reduce positioning errors, and ensure positioning accuracy Effect

Inactive Publication Date: 2017-06-06
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, due to the differences in antenna gain, feeder loss, and RF chips between developers and user terminals, there are differences in the signal strength received by the same wireless access point (AP), which leads to increased errors in positioning results and reduces the universality of the positioning system.

Method used

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  • Terminal difference eliminating method in indoor positioning technology based on signal intensity
  • Terminal difference eliminating method in indoor positioning technology based on signal intensity
  • Terminal difference eliminating method in indoor positioning technology based on signal intensity

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Embodiment Construction

[0059] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0060] The implementation schematic diagram of the present invention is as figure 1 As shown, the following is a specific embodiment, and its specific steps are as follows:

[0061] Step 1: offline training phase;

[0062] Step 1-1: Establish location fingerprint database:

[0063] will be like figure 2 The shown room 1411 and room 1412 are positioning areas, which are gridded, and each vertex of the grid is used as a reference point, and a Cartesian coordinate system is established to establish the coordinates of the sampling points.

[0064] Open the application software for collecting signals in the mobile terminal, collect the RSSI values ​​of the surrounding wireless access points at the sampling point, record the first 7 wireless access points with strong signal values ​​obtained at the same time as a set of data, and write it into In th...

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Abstract

The invention discloses a terminal difference eliminating method in an indoor positioning technology based on signal intensity. First, in an offline stage, a positioning region is divided into grids and a rectangular coordinate system is built, signal intensity and position coordinates collected at sampling points are obtained, equalization processing is performed, and a position fingerprint database is generated; then, in a positioning stage, signal intensity information of an actual positioning position is collected, and is preprocessed; Pearson similarity between actual collected data and position fingerprint database data is calculated, and is utilized to update the database; and finally, the preprocessed signal intensity information corresponding to the actual position is matched with the updated database, the sampling point with relatively small distance is selected, and the position coordinates of the sampling point are utilized to estimate the positioning position. The terminal difference eliminating method provided by the invention effectively reduces adverse effects caused to a positioning result by difference of different terminal equipment in received signal intensity, improves the degree of accuracy of indoor positioning, and has relatively high practical application value.

Description

technical field [0001] The invention relates to the field of WIFI positioning, in particular to a terminal difference elimination method in indoor positioning technology based on signal strength. Background technique [0002] In recent years, the business covered by smartphones has become more and more extensive. The user groups of various positioning applications based on mobile terminals, such as AutoNavi Maps, Baidu Maps, and Tencent Maps, have grown rapidly, and people are increasingly relying on these applications for travel. . The ubiquitous WIFI and increasingly high-speed data traffic allow users to exchange various information anytime and anywhere, including user location information. These have brought a huge user market to indoor positioning applications based on smart terminals. The indoor positioning system based on WLAN is favored by developers because of its convenient implementation and high positioning accuracy. However, due to the differences in antenna g...

Claims

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Application Information

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IPC IPC(8): H04W64/00G01S5/02
CPCH04W64/00G01S5/0252
Inventor 陈建新施莹鲁希若李一帆
Owner NANJING UNIV OF POSTS & TELECOMM
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