1. School of Engineering University of Newcastle Callaghan New South Wales Australia
2. School of Electrical Engineering and Computing University of Newcastle Callaghan New South Wales Australia
3. Geodesy and Geophysics Laboratory NASA Goddard Space Flight Center Greenbelt MD USA
4. Institute of Geodesy Graz University of Technology Graz Austria
5. Institute of Geodesy Leibniz University of Hanover Hannover Germany