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Method of indoor positioning through combination of WIFI and pedestrian dead reckoning (PDR)

A technology for indoor positioning and positioning coordinates, which is applied in the fields of short-distance communication, inertial navigation, and indoor positioning. It can solve problems such as difficult application, achieve a wide range of application scenarios, improve positioning accuracy, and solve the effect of dispersion in performance

Inactive Publication Date: 2017-05-03
北京金坤科创技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are not many methods for mixing the two positioning technologies in the true sense, and there are still problems in practical applications that are difficult to apply.

Method used

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  • Method of indoor positioning through combination of WIFI and pedestrian dead reckoning (PDR)
  • Method of indoor positioning through combination of WIFI and pedestrian dead reckoning (PDR)
  • Method of indoor positioning through combination of WIFI and pedestrian dead reckoning (PDR)

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Experimental program
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Effect test

Embodiment 1

[0041] Assuming that the target to be tested is an ordinary smart phone, the system schematic diagram is as follows Figure 4 Shown:

[0042] In this embodiment, the value of the time window utility function can be:

[0043]

[0044]

Embodiment 2

[0046] Assuming that the target to be tested is another smart terminal, the system schematic diagram is as follows Figure 5 Shown:

[0047] In this embodiment, the value of the time window utility function can be:

[0048]

[0049]

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Abstract

The invention provides a method of indoor positioning through combination of WIFI and pedestrian dead reckoning (PDR). The method is characterized in that the initial position of the object to be measured is obtained through a WIFI positioning subsystem, after the initial position of the object to be measured is acquired, the two sets of positioning subsystems such as a WIFI positioning subsystem and a PDR positioning subsystem respectively output the positions of the object to be measured, a time window utility function is used for effective linear weighting of coordinates output by the WIFI positioning subsystem and the PDR-based positioning subsystem, and after weighting, the coordinates are processed by Kalman filtering so that global positioning coordinates of mixed WIFI and PDR are obtained. The method utilizes characteristics of the WIFI indoor positioning technology and the PDR track, solves the problems of large WIFI indoor positioning volatility and performance dispersion after long-term operation of an inertial navigation device, improves a system positioning precision and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of indoor positioning, short-distance communication and inertial navigation. Background technique [0002] With the promotion of the concept of smart city and the rapid development of related technologies, people are increasingly aware of the importance of location information, which is the most important basic application element in the era of mobile Internet and Internet of Things. The demand for location information has promoted the rapid development of positioning technology, especially in the field of indoor positioning. Since the development of indoor positioning technology, common mainstream technologies include: Wi-Fi, Bluetooth, infrared, ultra-wideband (UWB, Ultra Wide Band), radio frequency identification (RFID), ZigBee, ultrasonic, inertial navigation, etc. [0003] Indoor positioning based on WIFI technology is the most widely used method at present, such as large shopping malls, supermarkets, large gath...

Claims

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Application Information

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IPC IPC(8): G01C21/20H04W64/00
CPCH04W64/00G01C21/206
Inventor 吴彤熊艳伟肖登坤
Owner 北京金坤科创技术有限公司
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