Description of the data flow

Trimble reciver is connected by the serial link to the personal computer, where the measured data are sent continuously. Some programs run in the computer under MS Windows 2000 operating system: primary program is the Trimble Reference Station software (TRS), which saves the measured data to the disk in the RINEX format and TRS runs special program after finish saving data to certain file. This special program checks the GPS data (in some cases it also merges the data) and it converts the data by another programs (CHECKRNX, LINKNAV, RNX2CRX, METRINTR) to the CompactRINEX format, attachs the meteorological data to the GPS data and prepares the data for sending.

Detailed information about meteorological data are shown on the page about meteorological data at the TUBO station.

The program for moving or delete the sent data and for management of primary data archive is runned at half an every hour. There are some other programs running on the computer. They are: a program for recording the meteorological sensors, a program for communication with computer network and a program for setting the computer clock by accurate time servers.

 

The proper transmittion is realized by operational center GOP (only in Czech). The GPS NAVSTAR data files are sent to the OLG data center in Graz. The data in files with 5-minutes length are sent to the experimental data center for DGPS.

Avialability of data from permanent GPS station TUBO in Brno is exactly described at page about TUBO station hosted by VUT.

 

 

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Horizon mask

The quantity and quality of measured data are depended on the plenty of obstacles around the antenna. The signal from satellite is observed, when the elevation angle of the satellite is above 5 degrees and the signal is not blocked by any obstacle. Review of obstacles is in the horizon mask scheme, which is actual for June 2001. The conditions of the receipt are very good at the TUBO station.