30
1. CONCLUSION
The first purpose of our experiments was to identify and
propose a DGPS correction diffusion system to be used
continuously on the whole CEI area, giving satisfactorily
accurate results.
We saw from our experiments that LW technology of
correction dissemination used to transmit from Podebrady
gives good results even tested at the edge of the coverage
area. As there are several unused LW transmitters on the
territories of the former Soviet block, and for this reason this
technology does not require big investments, they could be
combined in one network, to increase coverage and improve
data quality with a limited budget.
In some cases, where greater accuracy is required, it will be
necessary to provide by using local correction sources. For
this aim, DARC seems to be a very good transmission
system.
2. REFERENCES
Ahrer H., Doeller H. , 1998. GPS-Netz GesmbH-AREFl-
DARC-Technical Report GPS Netz Ziviltechniker GembH,
Voecklabruck, A 4840.
R. Cefalo, A. Di Girolamo, S. Greblo, G. Manzoni, R.
Pagurut, G. Plattner, T. Sluga, 1999. Which DGPS? Results
of Experiences with some RTCM Sources in Alpe Adria
Region. Proceedings of the 3 rd European Symposium on
GNSS, Genova - Italy 5-8 October 1999, pp 295-300.
de Robertis A., Gerin R, 1998. Public Transport GPS
Positioning in Trieste-Meeting on Data Radiobroadcasting
for Differential GPS Positioning and Navigation, University
of Trieste, March 6.
Dittrich J., Kuehmstedt E., Richter B., Reinhart E., 1997.
Accurate Positioning By Low Frequency (ALF) and other
services for emission of DGPS correction data in Germany-
Proceedings Int. Symp on DGPS in Engineering and
Cadastral Measurements, Education and Practice, Ljubljana,
August, 25-27,1997, Reports on Geodesy,
6(29), 1997,Politechnika Warszawska, Warsaw.
Faendrich H., 1998. DAB Pilot Project Baden Wuerttemberg-
Sueddeutschen Rundfunk Stuttgart, Heft 24, Stuttgart 1998.
Fernetti M„ Manzoni G„ 1997. A GPS+GLONASS
Multimedial Reference Station for DGPS+DGLONASS
Positioning and Terrestrial Navigation- Proceedings Int.
Symp on DGPS in Engineering and Cadastral Measurements,
Education and Practice, Ljubljana, August, 25-27,1997,
Reports on Geodesy, 6(29), 1997,Politechnika Warszawska,
Warsaw,pp 29,36.
Hoeggerl, 1997. DGPS Service in Austria- Proceedings Int.
Symp on DGPS in Engineering and Cadastral Measurements,
Education and Practice, Ljubljana, August, 25-27,1997,
Reports on Geodesy, 6(29), 1997,Politechnika Warszawska,
Warsaw.
Manzoni G., Planner G., 1999. DAB, Digital Audio
Broadcasting and DGPS experiments, Proceedings of the
Workshop on DGPS and GLONASS Tecniques and
Applications on Safety in CEI Area, Trieste, Italy, 9-12
March 1999, Reports on Geodesy, 3 (44), 1999, Politechnika
Warszawska, Warsaw.
Oszczak S., 1997. Egnos Project for Integration of GPS with
Glonass System- Proceedings Int. Symp on DGPS in
Engineering and Cadastral Measurements, Education and
Practice, Ljubljana, August, 25-27,1997, Reports on
Geodesy, 6(29), 1997, Politechnika Warszawska, Warsaw.
Vejrazka, F., 1997. Long Wave System of DGPS Correction
Dissemination in the Czech Republic. Proceedings of the
sixth CGSIC International Information Subcommittee
European Meeting. Polish Academy of Sciences, Committee
on Space Research. Warsaw, 11. - 13. 12. 1997.
Vejrazka F., Fiser J., Seidl L., Plasil J., 1998. One Year
Experience with DGPS Correction Dissemination by use of
Long Wave Transmitter.
KEYWOF
ABSTRAi
A number
support of
determinin
frequency
reference, ]
order to de
of the Soc
adopted fo
odometer. 1
The preser
positioning
particular,
survey, wh
about road
On the be
activity ca
employed '
data sampl
road. The
one-dimen;
chainage. r
points, whi
In most ca
measure t
possible, ;
correspond
or junction
In a typica
speed (abo
possible t(
points the
board con
localisatioi
determiner
relatively t
The most
board of l
positionin'
The desc
characteris
