Earth observation 2The 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).

Vector1SpatialThe 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.


The visit by Japanese Prime Minister Abe to Australia included a joint statement with the Australian Prime Minister on various matters including, importantly, "the promotion of the Geospatial Information Project using the Japanese Quazi-Zenith Satellite System". read more ...

The Project has been recognised by the selection of its latest research paper as the International Federation of Surveyors (FIG) "Article of the Month". The paper was presented at the FIG Congress 2014 in Kuala Lumpur, Malaysia.

Project Participants

RMIT   -   UNSW   -  JAXA   -   DSE   -   LPI   -   GA


Suelynn Choy sqDr Suelynn Choy
Project Leader P1.11