Data flow description

The Ashtech receiver is connected by serial line to a personal computer (on-site computer) to which the measured data are permanently sent. In on-site computer under Windows 95, several programs are running: the primary program is Geodetic Base Station Software (GBSS), prepared by Ashtech; this program stores the measured data on a disk in binary and in RINEX formats, and every hour starts a special program AUTOZ18; this program transforms the data by means of other programs (ASRINEXO, ASRINEXN, ASRINEXG, LINKRNX, RNX2CRX, METRINEX) to the format CompactRINEX, adds the meteorological data from another computer, and prepares the data to transmittion. The data in 5 and 15 minutes files are generated by the program HRLLDATA from the RINEX data files (continuously formed by the program GBSS). Every half on hour, another program is run with the aim to delete data being already transmitted and to organize primary data archive. Also a program to communicate with computer network and to set up accurate time for the local PC is running.

 

The proper transmittion is realized by operational center GOP (only in Czech). The files with measurements from GPS NAVSTAR satellites are only copied to data archive. The files with mixed measurements from both GPS NAVSTAR and GLONASS satellites are transmitted into both the data center OLG, Graz and the regional data center BKG, Frankfurt Am Main. The data of the 5 minute files is transmitted into an experimental data center for DGPS; the data of the 15 minute files is transmitted into global data center CDDIS.

Providing of unordinary data form permanent GPS observations has own separately page (only in Czech).