The effect of multipath and initial phase uncertainty on measurement time and epoch quantity was found to be
greater at points N1 and N2 where the sky was closed and semi-open. At point N1, referred to as a closed region, the
resolution time (constant time) of the initial phase uncertainty was generally longer than for other regions. Different
correction methods with network RTK when comparing point positions obtained from surface measurements with Static
GNSS and Totalstation, differences of up to dm were found for FLOAT, while differences of up to cm were found for
FIX. When comparing the statistical data obtained for each different variable, it is seen that the accuracy in the direction
of the h coordinate axes is low. Depending on the location of the measurement, better results were obtained, especially in
the N3, which has an open-air view. In addition, results were found to be better when signal multiplication was used when
looking at the point positions obtained for two different cases (with or without) whether the GNSS receiver's signal
reflection feature was used or not. When the statistical values obtained by different correction methods are examined,
they show similar features [10].
References
1.
Kanzaki
M.:
Inverted
RTK
system
and
its
applications
in
Japan,
International
Business
Planning
Office, Nippon GPS Solutions Corporation, 2006
2.
Kahveci, M., Kinematik GNSS ve RTK cors ağları, zerpa yayıncılık, ankara, 2009.
3.
Vollath, U., Buecherl, A., Landau H., “Long range RTK positioning using virtual reference stations”,
in proc. Institute of navigation national GPS 2000, salt lake city, utah, 19-22, september, 1143-1147,
2000.
4.
Rizos C.: Alternatives to current GPS-RTK services and some implications for CORS infrastructure
and operations, GPS Solut 11:151–158, 2007
5.
Wanninger, L., “Virtual reference stations for centimeter level kinematic positioning”, in proc of ion
gps (02), portland, oregon, pp 1400-1407, 2002.
6.
Wübbena G., Bagge A., Seeber G., Volker B., Hankemeier, P., “reducing distance dependent errors
for
real time precise dgps applications by establishing reference station Networks”, in proc.
Institute of navigation national gps 1996 kansas, 17-20 september, vol 2, 1845- 1852, 1996.
7.
Euler H.J., Keenan C.R., Zebhauser B.E., Wubenna G., “Study of a simplified approach in utilizing
information from permanent reference station arrays”, proceedings of ion GPS-01, salt lake city, 11-
14 september, 379-391, 2001.
8.
Uzel T., Eren K.: Sonuç Bildirgesi, Ulusal CORS Sisteminin Kurulması ve Datum Dönüşümü Projesi
İkinci Çalıştayı, İstanbul Kültür Üniversitesi, 18 Mayıs 2007
9.
Zhdanov A., Zhodzishsky M., Veitsel V., Ashjaee J.: Evolution of Multipath Error Reduction with
Signal Processing, GPS Solutions, Vol. 5, No. 3, pp. 19-28, 2002
10.
Xu G.: GPS Theory, Algorithms and Applications, Second Edition, Springer, Berlin, 2002
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