Wi-Fi fingerprint-assisted indoor mobile terminal inertial navigation method

A mobile terminal and inertial navigation technology, which is applied in the field of indoor navigation, can solve problems such as inability to work accurately for a long time, cumulative error of inertial navigation, etc., and achieve the effect of solving fingerprint positioning deviation and improving positioning accuracy

Inactive Publication Date: 2015-04-22
BEIJING UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] At present, most of the indoor positioning and navigation technologies use inertial navigation technology based on mobile terminal sensors, but because inertial navigation is prone to cumulative errors, it cannot work accurately for a long time

Method used

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  • Wi-Fi fingerprint-assisted indoor mobile terminal inertial navigation method
  • Wi-Fi fingerprint-assisted indoor mobile terminal inertial navigation method
  • Wi-Fi fingerprint-assisted indoor mobile terminal inertial navigation method

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Experimental program
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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and implementation steps.

[0030] There are 5 wireless access points APs in the implementation site layout, such as image 3 shown.

[0031] The flow chart of the indoor mobile terminal inertial navigation method assisted by Wi-Fi fingerprint is as follows figure 1 shown, including the following steps:

[0032] (1) Establish a rectangular coordinate system in the room plan, take the first sampling point as the origin, and record it as the reference point FP 1 (0,0), and then mark a sampling point every 2 meters, a total of 48 sampling points in the entire plan, that is, 48 ​​reference points, such as figure 2 shown;

[0033] (2) The terminal is at the reference point FP 1 (0,0) position, 5 wireless access points AP1~AP5 are scanned, and the signal strength values ​​RSSI of AP1~AP5 are detected, respectively: -66, -73, -100, -90, -80, unit dBm ;

[0034] (3) The f...

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Abstract

The invention provides a Wi-Fi fingerprint-assisted indoor mobile terminal inertial navigation method which comprises the following steps: calculating a weighting coefficient by using the value of Euclidean distance, obtained by virtue of a Wi-Fi fingerprint positioning technology, and the value of an inertial navigation distance of a mobile terminal; periodically weighing the pedestrian position obtained by Wi-Fi fingerprint positioning and the position obtained by inertial navigation of the mobile terminal; and calculating the final position of the mobile terminal. Compared with existing pure indoor navigation methods based on an inertial sensor of the mobile terminal, the method provided by the invention can be used for eliminating accumulative errors in the navigation of the inertial sensor, so that the indoor navigation precision is effectively improved.

Description

technical field [0001] The invention relates to the field of indoor navigation, and is especially suitable for an indoor navigation method of a mobile terminal sensor. Background technique [0002] At present, the demand for positioning and navigation in indoor environments is increasing day by day. However, due to the limitations of complex indoor environments and positioning accuracy, the satellite-based Global Positioning System (GPS) cannot give full play to its advantages in places such as indoors and buildings. Therefore, it is necessary to Use other technologies to complete the indoor positioning and navigation functions. [0003] Indoor positioning technologies mainly include Wi-Fi, radio frequency identification (RFID), ultrasonic, Zigbee, Bluetooth, infrared, inertial navigation based on motion sensors and other technologies. Considering the cost and implementation complexity, Wi-Fi positioning and inertial navigation technology have great advantages. [0004] Wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/16
CPCG01C21/165
Inventor 黎海涛王奇齐双
Owner BEIJING UNIV OF TECH
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