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Fig. 9 - Comparison between two different GPS
profiles made approximately in maximum and
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Distance (m)
Fig.10 - Altimetric difference for homologous
points along the profile.
5. Conclusion
A. wide range of positioning problems relative
to moving sensors and vehicles can be solved
through GPS also in Antarctica.
The solution of trajectory can be easy solved
when the required precision does not need for
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35
the phase ambiguities solution. Also in the case
of high accuracy requirements the solution can
be easily obtained for relatively short distances
(less than 4-5 km).
For medium and long distances and for high
accuracy surveying in Antarctica, it is very
helpful the use of advanced post processing
software (complete with OTF algorithms), dual
code and frequencies GPS receivers. Moreover
the frequent presence of ionospheric noise,
recognised as a cycle slips from the software,
requires an analysis of reduced portion of data.
Acknowledgements
Research carried out in the framework of the
Project on Glaciology and Paleoclimatology
and the Project on Geophysical and Geodetic
Observatories of the Programma Nazionale di
Ricerche in Antartide, and financially supported
by ENEA through a co-operation agreement
with Università degli Studi di Milano and the
Istituto Nazionale di Geofisica .
References
Bondesan A., Capra A.,Gubellini A.,Tison J.L.,
1994, On the use of static GPS measurements to
record the tidal response of a small Antarctic ice
shelf (Hells Gate ice shelf, Victoria Land).
Geografia Fisica Dinamica Quaternaria, 17,
pp.123-129.
Capra A., Gubellini A., Vittuari L.,1995. Reti
GPS per il controllo di deformazioni : analisi
dei risultati ottenuti con differenti programmi di
elaborazione dati. Bollettino della S.I.F.E.T.,
n.4 (95), pp.133-144.
Hothem L.D., Marsella M., Vittuari L., 1994.
Airborne GPS dual frequency P-Code and P-
Codeless data- experience with recent software
advancements. Proceedings of International
Symposium of kinematic system in Geodesy,
Geomatics, Banff, Calgary, Canada, Sept. 1994.
Vittuari L., 1994. Advanced GPS kinematic in
Antarctica. In: Reports on Geodesy.
Proceedings of the 4" Geodetic Meeting
Poland-Italy, Sept.1994. Warsaw Univ. Of
Technology. No.4(12), pp.181-195.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996
