WirelessHart location determination application

Presented By:VAIBHAV UKARANDE

SEMINAR ON WIRELESSHART: A REAL TIME APPLICATION FOR LOCATION DETERMINATION

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CONTENTS

What Is HART Technology

WirelessHART Architecture

Location Awareness In WSN

Localization In WirelessHART

Proposed Implementation

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Introduction to HART : What is HART?

Introduction Of WirelessHART: WirelessHART is the first

open wireless communication for process measurement and

control application.

Introduction

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What is HART Technology?

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Where it is used?

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The network uses IEEE 802.15.4 compatible radios operating in the 2.4GHz ISM radio band.

Distance Up to 250m line-of-sight between devices

Topologies: Mesh, Star, Combined Star & Mesh

Power Options: Line Powered or Battery Powered

What Is WirelessHART?

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WirelessHART Architecture:

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Physical Layer (IEEE 802.15.4)

Data Link Layer

Network Layer and Transport Layer

Network Manager

WirelessHART Architecture

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Maximum data rate (250 kbps)

Operating Frequency (2400 – 2483 MHz)

Defines radio characteristics, such as signaling method, signal strength and device sensitivity.

Physical Layer

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TDMA technology to provide collision free communication.

Channel Blacklisting

Channel Hoping

Data Link Layer

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To provide secure and reliable end to end communication for network devices.

To support mesh communication There are two routing protocol 1) Graph Routing

2) Source Routing

Network Layer and Transport Layer

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It is command oriented and hundreds of command have been already defined in it.

It is also possible for users to define their own commands.

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Application Layer

WirelessHART devices will be widely installed in thousands of factories. And it is valuable to know the locations of workers and assets because of the hazardous conditions in industrial environment, for example, a chemical leak, a tornado.

However, there is no location awareness support in WirelessHART

WHY THIS APPLICATION?

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All field devices are attached to fixed locations

We need to locate the handheld device The handheld device can sense the signal

strength from neighboring field devices Also, field devices can also sense the signal

strength of the handheld device However, two devices can not

communicate with each other for security issues

Then, how to compute the location?

Localization in WirelessHART : Solution

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Both field devices and the handheld device send neighbor health reports to the network manager periodically, which contain receive signal strength of their neighbors.

Thus, the network manager gets pairs of receive signal strength .e.g. field device 1 reports RSS of the handheld device is -50dbm and the handheld device report RSS of field device 1 is -51 dbm.

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Then, the network manager can choose most trustable pairs of receive signal strength by comparison and compute the location of the handheld device by trilateration

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Three kinds of distance indication information◦ RSSI (Received Signal Strength Indicator)

It makes use of signal strength decay models to estimate the distance

◦ TDOA(Time Difference of Arrival) It makes use of signal (usually sound) propagation

speed◦ AOA(Angle of Arrival)

It determines the direction with antenna array Our solution is based on RSSI because we

do not want to add extra devices to hardware

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Localization in WirelessHART: Example

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Proposed System

DEMO BOARD

DEMO BOARD

TRANSCIEVER

TRANSCIEVER

DEMO BOARD

HANDHELD DEVICE

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Demo board will be Microcontroller based board.

Transceiver will be IEEE 802.15.4 2.4 GHZ RF

Transceiver. Handheld device will be either GPS or GSM

based module.

Proposed Hardware

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In many large factories (e.g. refineries, chemical plants) to track the location of workers.

There is no location awareness application in WirelessHart.

Applications

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[1] HART Communication. http://www.hartcomm2.org[2] Saikat Guha, Rohan Narayan Murty and Emin Gun Sirer. Sextant:

A Unified Framework for Node and Event Localization in Sensor Networks. In Proc. of MobiHoc 2005, May 2005.[3] Shu Chen, Yingying Chen, Wade Trappe, "Exploiting Environmental Properties for Wireless Localization," the Thirteenth Annual International Conference on Mobile Computing and Networking (MobiCom 2007), Montreal, Canada, September 2007.[4] J. Song, S. Han, A. K. Mok, D. Chen, M. Lucas, M. Nixon, and W. Pratt, WirelessHART: Applying Wireless Technology in Real-Time Industrial Process Control. Real-Time Technology and Applications

Symposium, 2008.[5] BAHL, P., AND PADMANABHAN, V. RADAR: An In- Building RF-based User Location and Tracking System. In Proc. IEEE INFOCOM (Tel-Aviv, Israel, Mar. 2000].

REFERENCES

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THANK YOU

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