Indoor mobile phone positioning method based on TDOA (Time difference of Arrival)

A positioning method and mobile phone technology, applied in the field of indoor mobile phone positioning based on TDOA, can solve the problems of insufficient positioning accuracy, unsatisfactory accuracy and stability, large labor consumption, etc. Positioning accuracy and stability, the effect of improving measurement accuracy

Active Publication Date: 2017-09-01
FUJIAN NORMAL UNIV
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AI Technical Summary

Problems solved by technology

However, due to signal blocking and insufficient positioning accuracy, the above two mobile phone positioning systems cannot be applied to closed indoor environments
Signal fingerprint positioning based on WiFi network is currently the most common indoor wireless positioning method. However, the signal fingerprint positioning algorithm needs to establish an off

Method used

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  • Indoor mobile phone positioning method based on TDOA (Time difference of Arrival)
  • Indoor mobile phone positioning method based on TDOA (Time difference of Arrival)

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Embodiment Construction

[0023] Such as figure 1 Or shown in 2, the present invention discloses a kind of indoor mobile phone location method based on TDOA, comprises the following steps:

[0024] Step 1. During system deployment, pre-deploy multiple positioning base stations in the indoor environment with the function of sending acoustic beacons and wireless beacons. The number of base stations deployed should ensure that each mobile phone to be positioned has at least three base stations with line-of-sight transmission Condition; Specifically in the present invention, the wireless router can be transformed into a positioning base station, and the hardware solution selects a wireless router supporting OpenWRT, and increases a USB sound card and a sound box; the software platform adopts OpenWRT.

[0025] Step 2. In the initial stage of positioning, the positioning mobile phone first performs sound velocity detection to obtain the sound velocity value in the current environment V s ; Then download t...

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Abstract

The invention discloses an indoor mobile phone positioning method based on TDOA (Time difference of Arrival). Sound wave beacons and wireless beacons are transmitted and received through utilization of a microphone and a wireless network card built in a smart phone; distance measurement and positioning are carried out according to the time difference of transmission of the wireless signals and the sound wave signals; positioning base stations periodically transmit and broadcast the sound wave beacons and the wireless beacons and record transmitting time stamps of the signals through a drive layer; a positioning mobile phone receives the wireless beacons and the sound wave beacons of the nearby positioning base stations and records the arrival time stamps of the beacons through the drive layer; on the basis of the four time stamps, the positioning mobile phone can calculate the distance to the positioning base stations; frequency modulation is carried out on the sound wave beacons based on an MAC address; the modulation method can be used for identifying source addresses of the beacons; and the positioning mobile phone can calculate own position coordinate through adoption of a maximum likelihood method when measuring the arrival distance of the three positioning base stations. The method is independent of special hardware, time synchronization does not need to be carried out between system nodes, and the method has the advantages of simplicity, feasibility, high positioning precision and high stability.

Description

technical field [0001] The invention relates to an indoor positioning technology, in particular to a TDOA-based indoor mobile phone positioning method. Background technique [0002] With the widespread popularization of mobile smart terminals and wireless networks, the application of Location Based Services (LBS) has been increasing day by day, and it is playing an increasingly important role in driving navigation, smart management, social network, security monitoring and many other fields. effect. Among them, terminal positioning is the key premise of location services. Only when terminal location information is obtained, various applications and controls of physical and information fusion can be effectively switched. For example, some large indoor places (such as parking lots, logistics warehouses, mines, prisons, archaeological sites, and exhibition centers) all need to locate people or objects in order to realize navigation, monitoring, and management. In addition, in ...

Claims

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Application Information

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IPC IPC(8): H04W4/02H04W64/00
Inventor 叶阿勇金俊林
Owner FUJIAN NORMAL UNIV
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