WirelessHart location determination application
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The document discusses location awareness in WirelessHART networks. It proposes a method for locating handheld devices by having field devices and the handheld device report received signal strength to the network manager. The network manager can then use trilateration to compute the location of the handheld device based on these signal strength measurements from multiple fixed field devices. A demonstration system is proposed using WirelessHART transceivers on demo boards to communicate and a handheld device with GPS or GSM to enable location tracking of workers in industrial environments like factories.
![[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].
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WirelessHart location determination application
- 2. CONTENTS What Is HART Technology WirelessHART Architecture Location Awareness In WSN Localization In WirelessHART Proposed Implementation 2
- 3. Introduction Introduction to HART : What is HART? Introduction Of WirelessHART: WirelessHART is the first open wireless communication for process measurement and control application. 3
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- 6. 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 6
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- 8. Physical Layer (IEEE 802.15.4) Data Link Layer Network Layer and Transport Layer Network Manager 8
- 9. Maximum data rate (250 kbps) Operating Frequency (2400 – 2483 MHz) Defines radio characteristics, such as signaling method, signal strength and device sensitivity. 9
- 10. TDMA technology to provide collision free communication. Channel Blacklisting Channel Hoping 10
- 11. 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 11
- 12. 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. 12
- 13. 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 13
- 14. 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? 14
- 15. 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. 15
- 16. 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 16
- 17. 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 17
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- 20. 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. 20
- 21. In many large factories (e.g. refineries, chemical plants) to track the location of workers. There is no location awareness application in WirelessHart. 21
- 22. [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]. 22
- 23. THANK YOU 23