Indoor Positioning using TDOA Measurements from Switching GPS Repeater

Gyu-In Jee, Jae-Hyuk Choi and Sung-Chun Bu

Abstract:	Another new method for the GPS repeater based indoor positioning is proposed and its feasibility is verified by experiments in this paper. If we use a GPS repeater with RF switch, we can switch GPS signal re-radiation from one antenna to other one at a time. This RF switching enable us to re-radiate signal from only one antenna at certain moment and we know which antenna is transmitting now. When switching happens, there is a certain change in signal retransmission path. This change corresponds to the TDOA (Time Difference of Arrival) between the two switched retransmission antennas and the user. Therefore if we have four retransmission antennas connected to the switching repeater, we can obtain three TDOA measurements between the retransmission antennas and the user for 3D positioning. Indoor experiments using a 1x4 switching GPS repeater is performed and positioning accuracy about 2-4 m (2drms) is achieved.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1970 - 1976
Cite this article:	Jee, Gyu-In, Choi, Jae-Hyuk, Bu, Sung-Chun, "Indoor Positioning using TDOA Measurements from Switching GPS Repeater," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1970-1976.
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