Hybrid Visible Light and Ultrasound-Based Sensor for Distance Estimation.

Jose Rabadan,Julio Rufo,Rafael Perez-Jimenez,Rafael Rodríguez,Martin Luna-Rivera,Victor Guerra

doi:10.3390/s17020330

Jose Rabadan, Julio Rufo + Show 4 more

Open Access

https://doi.org/10.3390/s17020330

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Abstract

Distance estimation plays an important role in location-based services, which has become very popular in recent years. In this paper, a new short range cricket sensor-based approach is proposed for indoor location applications. This solution uses Time Difference of Arrival (TDoA) between an optical and an ultrasound signal which are transmitted simultaneously, to estimate the distance from the base station to the mobile receiver. The measurement of the TDoA at the mobile receiver endpoint is proportional to the distance. The use of optical and ultrasound signals instead of the conventional radio wave signal makes the proposed approach suitable for environments with high levels of electromagnetic interference or where the propagation of radio frequencies is entirely restricted. Furthermore, unlike classical cricket systems, a double-way measurement procedure is introduced, allowing both the base station and mobile node to perform distance estimation simultaneously.

Highlights

Indoor distance measurement has traditionally been a challenging problem for many indoor applications that require positioning information
4, where the measurement devices are aligned and the mobile node to that shown in Figure 4, where the measurement devices are aligned and the mobile node changes changes its along position along a line
This work has presented a new distance measurement scheme based on a Time Difference of Arrival (TDoA) technique that uses a dual optical-ultrasound system

Summary

Introduction

Indoor distance measurement has traditionally been a challenging problem for many indoor applications that require positioning information. Light Positioning or VLP, are being proposed for these kinds of applications [6,7,8,9]. One example could be robot guidance inside an industrial facility (that can be heavily affected by electromagnetic (EM) noise) or positioning inside a building when security forces are under a bomb threat and jamming devices are activated, in order to avoid remote control or cell phone detonators. It takes advantage of the relative high switching speed of Light-Emitting Diode (LED)

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Discussion

Conclusion