scholarly journals GPS Satellite Interference in Hungary

2001 ◽  
Vol 196 ◽  
pp. 319-323
Author(s):  
T. Borza ◽  
I. Fejes
Keyword(s):  
Radio Frequency ◽  
Global Positioning System ◽  
Digital Data ◽  
Signal Frequency ◽  
Control Network ◽  
Radio Frequency Interference ◽  
Positioning System ◽  
Gps Measurements ◽  
Global Positioning ◽  
Geodetic Control

Civil users of the NAVSTAR Global Positioning System (GPS) in Hungary occasionally experience interference at the 1575.42-MHz GPS signal frequency. As the application of the GPS technique spreads rapidly in our country, radio frequency interference (RFI) should be considered a serious threat. The new geodetic control network (OG-PSH) in Hungary is based on GPS measurements and incorporates more than 1100 sites. The paper reports the experiences gained during the establishment of the network. Interference sources were tracked to ground-based digital data transmissions for telecommunications, which operate mostly in the Western part of Hungary. Telecommunication regulations exceptionally allow such transmissions in specified countries. In order to warn potential GPS users, the interference sources are being mapped.

Integration of the global positioning system with geodetic leveling surveys in ground subsidence studies

CISM journal ◽  
1989 ◽  
Vol 43 (4) ◽  
pp. 377-386 ◽  
Author(s):  
Adam Chrzanowski ◽  
Chen Yong-qi ◽  
Roger W. Leeman ◽  
Julio Leal ◽  
Maraven
Keyword(s):  
Global Positioning System ◽  
Vertical Component ◽  
Monitoring Network ◽  
Oil Fields ◽  
Ground Subsidence ◽  
Deformation Analysis ◽  
Positioning System ◽  
Gps Measurements ◽  
Global Positioning ◽  
Moderate Climate

Integration of GPS measurements with terrestrial geodetic leveling has been implemented by the authors in monitoring ground subsidence in oil fields in Venezuela in an area of about 50 km x 50 km. The subsidence rate reaches up to 20 cm/year. A mathematical model for combining the GPS surveys with dynamic leveling measurements has been developed by utilizing the well known University of New Brunswick generalized method of deformation analysis. The implementation of GPS was preceded by test surveys (5 survey campaigns) in Canada on a network with 0.7 km to 30 km baselines, using TI 4100, WM101, and Trimble 4000SX receivers, and on a portion of the monitoring network in Venezuela (2 survey campaigns) using WM101 receivers. The accuracy of the test surveys has been evaluated using MINQE technique and by comparing the subsidences determined with GPS and precise leveling. The results indicate that with C/A-code receivers and with the present geometry of the satellite distribution, the vertical component of the short and medium (up to 30 km) length of the GPS baselines can be determined with an accuracy ranging from 15 mm in a moderate climate to 30 mm in hot and humid conditions.

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