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Indoor positioning method combining geomagnetic field and WIFI (wireless fidelity) signals

An indoor positioning and geomagnetic field technology, applied in positioning, ground navigation, wireless communication, etc., can solve problems such as unfavorable use of ordinary consumer mobile phone terminals, failure to comprehensively consider geomagnetic field strength information, and adding complex anti-electromagnetic interference equipment

Active Publication Date: 2014-03-12
XIAMEN YAXON NETWORKS CO LTD
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Problems solved by technology

[0002] Indoor positioning technology has great value in indoor public place monitoring and indoor navigation applications. Among them, WIFI signals are widely present in most places in the city, and the smart phones currently consumed by the public have WIFI reception functions, so WIFI positioning is universal and easy. Realization; the earth's magnetic field is affected by the indoor environment (reinforced concrete structure, iron doors and windows, etc.), so that the earth's magnetic field has different field strength distributions in different indoor locations. The application is the electronic compass on the mobile phone), so the use of geomagnetic field strength information for positioning is also an easy and widely used method, but a single indoor positioning technology cannot achieve very ideal positioning accuracy
[0003] In invention patents 201010176333.1 and 201010176348.8, a device for indoor positioning and navigation using geomagnetic information is proposed. As stated in the patents, geomagnetic information is often subject to electromagnetic interference (usually WIFI, electrical appliances, etc. in indoor environments), so the invention A complex resonant giant magneto-impedance amorphous wire sensor is used to overcome interference. In fact, the WIFI signal itself is also an effective positioning information (invention patents 201310107068.5, 200910242700.0, etc.), and the single anti-interference method not only does not make full use of the effective Positioning information, and additional complex anti-electromagnetic interference equipment is required, which is not conducive to the use of ordinary consumer mobile phone terminals
Looking at the existing WIFI positioning technology, there is no comprehensive consideration of the geomagnetic field strength information.

Method used

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Embodiment Construction

[0035] As a specific embodiment, the indoor positioning method of the fusion of geomagnetic field and WIFI signal of the present invention comprises the following steps:

[0036] Step 1: In the WIFI environment, collect the WIFI signal and the geomagnetic signal of each sampling point, normalize the WIFI signal and the geomagnetic signal of each sampling point, so that the value range is in the same interval, and the same sampling point The normalized WIFI signal and the geomagnetic signal are combined into a normalized mixed fingerprint vector;

[0037] Step 11: Take uniform sampling at intervals in the room, and record each sampling point P i (i=1,2,3,...,N, N is a positive integer), latitude and longitude coordinates, M WIFI MAC IDs (physical address of the wireless network card, M is a positive integer), m WIFI signal strength x i (i=1,2,3,...,m, m is a positive integer and m≤M), the strength of the geomagnetic field b i Three components in X, Y, Z directions (b i x,b ...

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Abstract

The invention relates to the technical field of indoor positioning, in particular to an indoor positioning method combining geomagnetic field and WIFI (wireless fidelity) signals. According to the method, in an offline sampling stage, WIFI signal strength and geomagnetic field information samples are simultaneously collected and are uploaded to a positioning center database, data characteristic fusion and analysis are performed by adopting a principal component analysis method at a positioning center to generate a fusion projection matrix, and all sampling information in the database are projected by the projection matrix to obtain a fusion sample; in an online positioning stage, the vector of WIFI and geomagnetic field intensity information received by a terminal is projected by the fusion projection matrix to generate a fusion vector, and a positioning result is obtained by comparing the fusion vector with the fusion sample in the positioning center database. By adopting the method, accurate positioning combining WIFI and geomagnetic field intensity information can be realized on an existing ordinary smart phone.

Description

technical field [0001] The invention relates to the technical field of indoor positioning, in particular to an indoor positioning method for fusing geomagnetic fields and WIFI signals. Background technique [0002] Indoor positioning technology has great value in indoor public place monitoring and indoor navigation applications. Among them, WIFI signals are widely present in most places in the city, and the smart phones currently consumed by the public have WIFI reception functions, so WIFI positioning is universal and easy. Realization; the earth's magnetic field is affected by the indoor environment (reinforced concrete structure, iron doors and windows, etc.), so that the earth's magnetic field has different field strength distributions in different indoor locations. The most common application is the electronic compass on mobile phones), so using geomagnetic field strength information for positioning is also an easy and widely used method, but a single indoor positioning...

Claims

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Application Information

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IPC IPC(8): G01S5/02H04W64/00
CPCG01C21/08G01S5/0252G01S5/0257G01S5/04
Inventor 涂岩恺黄家乾陈典全时宜
Owner XIAMEN YAXON NETWORKS CO LTD
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