Below this introduction is part for the historic website of the GPS Signal Science Division
of the Collaborative Research Centre for Satellite Systems, the CRCSS. This Centre was directed by
Dr Elizabeth Essex-Cohen of La Trobe University, with much GPS and ionospheric research being undertaken
at La Trobe University, but other GPS related, especially more applied application research being undertaken at other Australian centres.
Readers are advised to start at the homepage of the GPS Signal Science Division of the CRCSS. The homepage includes a brief accounts of plans for CRCSS research conducted at other Australian centres. However the value of this site was greatly enhanced by providing an account of the history of satellites, and of Australia's involvement in this history.
Elizabeth Essex-Cohen with 1:1 FedSat model
The revamp of this historic webpage is dedicated to Dr Elizabeth Essex-Cohen (1940-2004)
who in 1974 was the only Australian involved in the design of
the US Air Force satellite navigation system NAVSAT, initially conceived of as a purely military system, later renamed GPS,
and made generally available when Selective Availability was turned off in May 2000.
After her initial contribution in the GPS design stage,
she returned to the US Air Force Geophysical Research Station in 1978
as a NASA Senior Post-doctoral Fellow, engaged then in basic ionospheric studies.
Returning to Australia in 1979 , she actively continued her research on the ionosphere,
and was active in lobbying for the second Australian satellite, FedSat.
She was in charge of GPS science program for FedSat.
Sadly she suddenly became seriously ill, and was hospitalised in the Xmas following the actual launch of FedSat. She had a partial remission in January 2004, enabling her to participate in an International Beacon Satellite Workshop held in Hobart, January 2004. But she then relapsed, and passed away in March 2004. After her death, a huge manual was found amongst her books, which was the Operators Manual for a Satellite of the 1960's; on her death she was probably the only Australian with over 35 years involvement with satellite technology.
To fully appreciate Elizabeth's pioneering work one needs an overview of GPS, while on this page an account is given of the GPS satellite constellation system, and brief explanation how and why the ionosphere interfere's with the use of GPS
A selection of Elizabeth's scientific papers is available here, whilst the account of her lifelong involvement in GPS is detailed here
This page dates from early 1997.
Orbit with the La Trobe Eagle
La Trobe University is a major facility in the plans for the Australian Cooperative Research Centre for Satellite Systems (CRCSS).
To establish the CRCSS, the Federal government has already pledged $20 million over seven years.
Plans call for the CRCSS to launch its first satellite, FedSat 1 in time for the centenary of Federation in 2001.
La Trobe is the only Victorian university that is in the CRCSS.
Once the CRCSS is formally established at the end of 1997, there will be new opportunities in Space Science and Technology for both undergraduate and research students. Subject to the final exchange of contracts formally establishing the CRC for Satellite Systems, top-up scholarships will be available for post-graduate students. Contact the listed researchers for details.
Listed Researchers in ATMOZ-GPS
Probing the atmosphere and ionosphere using GPS Signals