International Journal of Navigation and Observation 
Volume 2008 (2008), Article ID 462062, 7 pages
doi:10.1155/2008/462062
Research Article

Remote Synchronization Simulation of Onboard Crystal Oscillator for QZSS Using L1/L2/L5 Signals for Error Adjustment

Toshiaki Iwata,1 Michito Imae,1 Tomonari Suzuyama,1 Yuji Hashibe,2 Satoshi Fukushima,2 Akira Iwasaki,3 Kenji Kokubu,3 Fabrizio Tappero,4 and Andrew G. Dempster4

 1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
2Space Engineering Development Co. Ltd., Tokyo, Nakano-ku 164-0001, Tokyo, Japan
3Department of aeronautics and astronautics, Faculty of Engineering, University of Tokyo, Tokyo 113-8656, Japan
4School of Surveying and Spatial Information Systems Faculty of Engineering, University of New South Wales, Sydney 2052, Australia
Received 17 July 2007; Accepted 6 October 2007

Recommended by Demetrios Matsakis

Abstract

A new error adjustment method for remote synchronization of the onboard crystal oscillator for the quasi-zenith satellite system (QZSS) using three different frequency positioning signals (L1/L2/L5) is proposed. The error adjustment method that uses L1/L2 positioning signals was demonstrated in the past. In both methods, the frequency-dependent part and the frequency-independent part were considered separately, and the total time information delay was estimated. By adopting L1/L2/L5, synchronization was improved by approximately 15% compared with that using L1/L2 and approximately 10% compared with that using L1/L5 and a synchronization error of less than 0.77 nanosecond was realized.