GKÚ Bratislava undertakes to provide high-quality and modern services for users using GNSS receivers for work in national geodetic datums. This obligation is fulfilled by means of the SKPOS®, operation, which allows on-line or post-processing work in mandatory geodetic datums ETRS89 and S-JTSK (in JTSK03 realization). On account of this fact it is necessary to carry out continuous monitoring of the service quality. At present, the SKPOS® service monitoring is carried out at three levels, namely:
- monitoring provided using the control software of the service,
- analysis of the time series of SKPOS® permanent stations,,
- monitoring of the network solution quality.
Monitoring provided using the control software of the service
Continuous monitoring of the network integrity is provided as well as the monitoring of individual sections such as:
- monitoring of reference stations coordinates,
- observation data quality control,
- monitoring of the ionosphere state,
- monitoring of the troposphere state,
- prediction of geometric errors.
Analysis of the time series of SKPOS® permanent stations
Time series are generated from the topocentric coordinates of SKPOS® stations obtained through the processing of GNSS permanent observations using scientific software. The generated time series provide real preview of the operation or the performance of the station and in case of antennas mounted on the ground also valuable information about the kinematics of the region the antennas are located in.
In recently presented conclusions and results from the analyses of the SKPOS® stations time series it has been noted that the location and marking of the station have been selected correctly and despite a few discoveries concerning jump or anomalous performance of some stations (note: millimetre-level values), their markings fully meet the primary purpose of the service, which is provision of the reference frame for selected geodetic activities and work in the cadastre of real estate.
Monitoring of the network solution quality
The monitoring is provided using the application created at GKÚ Bratislava. The network solution monitoring is based on a virtual principle and uses open source program RTKNAVI, which is part of a software package RTKLIB. This processes baselines created by a virtual reference station (VRS) generated from SKPOS® (represents the field measurement of a virtual monitoring station) and a selected, as a rule the nearest, real SKPOS® reference station.
Criteria used to assess the network solution quality are deviations obtained from the coordinate differences between the computed and the known positions of the SKPOS® permanent stations used.
Monitoring of the network solution quality | desktop version
Monitoring of the network solution quality | mobile version