The Quasi-Zenith Satellite System (QZSS) is a Japanese regional satellite navigation system that, in addition to conventional GNSS signals, transmits an augmentation signal called LEX (L‐band Experimental Signal).
This project will investigate the use of the QZSS LEX signal for delivering high accuracy real-time positioning (especially RTK-PPP) on a national basis in support of a future national positioning infrastructure (NPI).
The LEX signal is potentially suited to meeting the communications needs of the NPI. This research will demonstrate the viability of and technical considerations for using the LEX signal in this role.
This proposal takes advantage of a unique opportunity afforded the CRCSI to collaborate with JAXA on the use of QZSS in Australia. JAXA is offering dedicated access to a LEX decoder for the purposes of this project as well as access to the QZSS ground segment in order to upload test messages to the QZSS satellite for transmission via the LEX signal.
Suelynn Choy, Xingwang Yu and Kefei Zhang presented at the 4th Asia Oceania Regional Workshop on GNSS in December about their Performance Assessment of a Combined GPS and QZSS Positioning System in Melbourne, Australia.
They worked from the RMIT GNSS Tracking Station and Bundoora, about 17km north east of Melbourne.
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