Precise Positioning (1.01)

This project will capitalise on collaboration with international GNSS/RNSS receiver and software providers to focus on Australia, where a national CORS network will have inter-station distances greater than those used in smaller and more densely populated regions of the world. (Commercial solutions will target these larger and more profitable markets and may therefore not be ideally suited to the Australian context).

Enabling successful and reliable integer ambiguity resolution for multi-GNSS/RNSS positioning in real-time over large distances is a fundamental requirement for any ultra-precise GNSS parameter (position, attitude, time, troposphere, ionosphere) estimation.

Research themes

Two important research challenges will be addressed that emerge when processing multi-constellation, multi-frequency GNSS/RNSS data and that underpin the CRCSI program objectives of “instantaneous GNSS/RNSS positioning, anywhere, anytime, with the highest possible accuracy and the highest possible integrity”

  1. The development of new integer inference theory to allow the estimation and validation of large integer ambiguity sets under the emerging multi-GNSS/RNSS environment and the proliferation of CORS networks across Australia
  2. The facilitation of new ambiguity resolution-enabled precise point positioning through improved ionosphere and troposphere modelling

The multi-GNSS research continues to be highlighted in print and electronic media, with the mixing of the established Global Positioning System (GPS) with the newest satellite system in the sky, the Chinese-developed Beidou attracting significant coverage.  By combining GPS with Beidou, satellite availability is increased with 14 new satellites crossing our sky at a high angle, improving positioning capability and ultimately creating a system that is perfect for both urban and mining environments.


Last quarter saw the completion of an 80km long baseline experiment conducted with 10 multi-GNSS receivers between Curtin University and Muresk Agricultural Institute.


This research is unique because it combines all the known Australian expertise on GNSS carrier phase ambiguity resolution; it is based on advanced integer inference theory mastered by only a few; and the research outputs are new and improve quality of GNSS ambiguity resolution based positioning

Project Participants

Research and Education   -   Curtin University   -   QUT   -   RMIT - UNSW

43pl   -   AAM   -   GPSat   -   Leica   -   Omnistar   -   Septentrio

Government   -   Geoscience Australia   -   Landgate