Right Hand Circularly Polarized (RHCP) Effects on the Measurements and Solutions of the Pseudolite-based Indoor Navigation Systems

Haeyoung Jun

Abstract:	The GPS system uses Right-Hand Circularly Polarized signals. When the signal is received by a patch antenna, the measurement has a phase error term depending on the line of sight (LOS) vector from a transmitter to a receiver. The LOS vectors from GPS satellites to the reference or the users are almost same, and the RHCP effects are eliminated by double differencing method on the outdoor GPS. On the other hand, The LOS vectors from pseudolites to the reference and the user are different from each other and changed when the user moves, therefore, the RHCP effects are not removed even by double difference in the indoor navigation system. The RHCP effect is as big as several centimeters, which should not be negligible considering the error of the system is just several centimeter-level. This paper shows the RHCP effect on the asynchronous pseudolite-based indoor navigation system on simulations and experiments. The RHCP effect on time synchronization of the synchronous pseudolite-based indoor navigation system is also introduced. Then, it shows the RHCP-compensated results and the improvement on double difference measurements and position results.
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:	1977 - 1987
Cite this article:	Jun, Haeyoung, "Right Hand Circularly Polarized (RHCP) Effects on the Measurements and Solutions of the Pseudolite-based Indoor Navigation Systems," 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. 1977-1987.
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