Abstract
Indoor positioning systems based on Received Signal Strength Indicator (RSSI) in Wireless Sensor Networks (WSNs) are commonly used. The position accuracy in these systems is highly affected by the wireless medium variability, and therefore, a precise calibration is necessary to translate the power measurements to corresponding distance between each pair of nodes. In this paper, we propose a calibration scheme that is tailored to Body Area Networks (BANs) applications. The a priori knowledge about the environment conditions in these applications can increase the accuracy of the localization system, improve its robustness to interference, and reduce the number of RSSI measurements which are required for the calibration process compared to the traditional calibration methods. We define a criterion to obtain the calibration scheme using different a priori knowledge for both the mapping table and the path-loss model parameters. For evaluation of our new calibration scheme, we conducted a series of experiments in a real-world indoor environment, focusing on a proximate environment that is commonly used in BANs. We showed that for a tracking application, calibration methods utilizing the a priori knowledge are superior in terms of localization accuracy over other existing calibration methods with relatively small number of offline measurements.
| Original language | English |
|---|---|
| Pages (from-to) | 555-569 |
| Number of pages | 15 |
| Journal | Ad Hoc Networks |
| Volume | 11 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2013 |
| Externally published | Yes |
Bibliographical note
Funding Information:The authors would like to thank Ami Luttwak for his help in setting up the Polaris tracking system. The authors also thank the anonymous reviewers for their valuable comments. Gaddi Blumrosen holds a B.Sc. and M.Sc. in Electrical Engineering from Technion, Israel Institute of Technology and Tel Aviv university, respectively, and a Ph.D. from Hebrew university from the School of Computer Science and Engineering. He is currently a postdoctoral fellowship at Tel Aviv University focusing on exploring radar techniques. His main area of research includes signal processing for wireless communication, methods to exploit channel side information in telecommunication systems, and biological and medical systems modeling. Bracha Hod received her B.Sc. and M.Sc. degrees in Computer Science from The Hebrew University of Jerusalem in 2002 and 2005, respectively. She is currently pursuing a Ph.D. degree in Computer Science at the Hebrew University of Jerusalem. Her main research interests include computer networking, wireless communication, mobile ad hoc networks, and wireless sensor networks. Tal Anker received his B.Sc. M.Sc. and Ph.D. degrees in Computer Science from the Hebrew University, Jerusalem in 1994, 1997, 2001, respectively. He has been combining industry work along with research activities since 1994. His last position in the industry was as the CTO of Marvell Software Solutions Israel. He is currently a part time researcher at the Department of Computer Science, the Hebrew University of Jerusalem. His research interests include Networking in general, Security intrusion prevention systems, QoS, High Speed networks, Distributed Systems, Wireless Sensor Networks and Operating Systems. Danny Dolev received his B.Sc. degree in Mathematics and Physics from the Hebrew University, Jerusalem in 1971; M.Sc. in Applied Mathematics at the Weizmann Institute of Science, Israel, in 1973; and Ph.D. on Synchronization of Parallel Processors in 1979, also at the Weizmann Institute of Science, Israel. He was a Post-Doctoral fellow at Stanford University, 1979–1981, and an IBM Research Fellow 1981–1982. He joined the Hebrew University in 1982. From 1987 to 1993 he held a joint appointment as a professor at the Hebrew University and a research staff member at the IBM Almaden Research Center. He is currently a professor at the Hebrew University of Jerusalem. His research interests cover all aspects of distributed computing, fault tolerance, security and networking – theory and practice. Boris Rubinsky received his B.Sc. and M.Sc. at the Technion, Israel Institute of Technology in 1971 and 1977, respectively. He received his Ph.D. in Mechanical Engineering/Bioengineering from the Massachusetts Institute of Technology in 1980. He is a faculty member at the University of California at Berkeley since 1980. He is currently a professor of the Graduate School at U.C. Berkeley. His area of research is in biomedical device technology, with particular emphasis on thermodynamic aspect and bioelectronic aspects.
Funding
The authors would like to thank Ami Luttwak for his help in setting up the Polaris tracking system. The authors also thank the anonymous reviewers for their valuable comments. Gaddi Blumrosen holds a B.Sc. and M.Sc. in Electrical Engineering from Technion, Israel Institute of Technology and Tel Aviv university, respectively, and a Ph.D. from Hebrew university from the School of Computer Science and Engineering. He is currently a postdoctoral fellowship at Tel Aviv University focusing on exploring radar techniques. His main area of research includes signal processing for wireless communication, methods to exploit channel side information in telecommunication systems, and biological and medical systems modeling. Bracha Hod received her B.Sc. and M.Sc. degrees in Computer Science from The Hebrew University of Jerusalem in 2002 and 2005, respectively. She is currently pursuing a Ph.D. degree in Computer Science at the Hebrew University of Jerusalem. Her main research interests include computer networking, wireless communication, mobile ad hoc networks, and wireless sensor networks. Tal Anker received his B.Sc. M.Sc. and Ph.D. degrees in Computer Science from the Hebrew University, Jerusalem in 1994, 1997, 2001, respectively. He has been combining industry work along with research activities since 1994. His last position in the industry was as the CTO of Marvell Software Solutions Israel. He is currently a part time researcher at the Department of Computer Science, the Hebrew University of Jerusalem. His research interests include Networking in general, Security intrusion prevention systems, QoS, High Speed networks, Distributed Systems, Wireless Sensor Networks and Operating Systems. Danny Dolev received his B.Sc. degree in Mathematics and Physics from the Hebrew University, Jerusalem in 1971; M.Sc. in Applied Mathematics at the Weizmann Institute of Science, Israel, in 1973; and Ph.D. on Synchronization of Parallel Processors in 1979, also at the Weizmann Institute of Science, Israel. He was a Post-Doctoral fellow at Stanford University, 1979–1981, and an IBM Research Fellow 1981–1982. He joined the Hebrew University in 1982. From 1987 to 1993 he held a joint appointment as a professor at the Hebrew University and a research staff member at the IBM Almaden Research Center. He is currently a professor at the Hebrew University of Jerusalem. His research interests cover all aspects of distributed computing, fault tolerance, security and networking – theory and practice. Boris Rubinsky received his B.Sc. and M.Sc. at the Technion, Israel Institute of Technology in 1971 and 1977, respectively. He received his Ph.D. in Mechanical Engineering/Bioengineering from the Massachusetts Institute of Technology in 1980. He is a faculty member at the University of California at Berkeley since 1980. He is currently a professor of the Graduate School at U.C. Berkeley. His area of research is in biomedical device technology, with particular emphasis on thermodynamic aspect and bioelectronic aspects.
| Funders | Funder number |
|---|---|
| Tel Aviv University |
Keywords
- Auto-calibration
- Body area networks
- Calibration
- RSSI