Abstract
Short distance, millimeter-level ranging based on backscatter RF tags remains a challenge today. We propose a composite Dual-Frequency Continuous-Wave and Continuous- Wave (DFCW/CW) radar system for localization of backscatter RF tags. The coarse DFCW range result is used to correct the cycle ambiguity of the more accurate, CW range result. A Minimum Mean Square Error (MMSE) based method is employed to combine the DFCW and CW ranging data, given spectrum constraints. The composite radar concept is demonstrated with a custom, 5.8 GHz, backscatter RF tag system, in a typical indoor laboratory environment with a strong Line-of- Sight (LOS). Results show that the MMSE technique can resolve the CW cycle ambiguity for a moving tag and results in a range error of approximately 1 mm after an acquisition period.
Copyright Notice
The documents contained in these directories are included by the contributing authors as a means to ensure timely dissemination of scholarly and technical work on a non-commercial basis. Copyright and all rights therein are maintained by the authors or by other copyright holders, notwithstanding that they have offered their works here electronically. It is understood that all persons copying this information will adhere to the terms and constraints invoked by each author’s copyright. These works may not be reposted without the explicit permission of the copyright holder.