RF Bearing Estimation in Wireless Sensor Networks

TitleRF Bearing Estimation in Wireless Sensor Networks
Publication TypeConference Proceedings
Year of Conference2009
AuthorsLedeczi, A., J. Sallai, and P. Volgyesi
Conference NameGovernment Microcircuit Application and Critical Technology Conference (GOMACTech 09)
Date Published03/2009
Conference LocationOrlando, FL

This paper introduces a novel method for bearing estimation based on a rotating antenna generating a Doppler shifted RF signal. The small frequency change can be measured even on low cost resource constrained nodes using a radio interferometric technique introduced previously. Measuring the Doppler shift at two known locations provides a bearing estimate to the rotating node. An alternative approach employing a switched antenna array is proposed that provides improved robustness by avoiding moving parts.