Welcome to the world of Global Positioning Systems (GPS) !

To find any specific location any time in this globe is not a mystery by the GPS 24 satellites constellation.

This presentation will briefly introduce the GPS data acquisition, Differential Global Navigation Satellite System (GNSS) setup, and the VDL Data Link technology in DGNSS applications, the Special Category - I DGNSS Instrument Approach Systems. (SCAT-I DIAS) Data modulation in Differential Phase Shift Keying is used in this data link, Time Division Multiple Access (TDMA) makes the physical layer offers more capacity than is required by any SCAT-I ground station.

Hardware and software designing consideration is included in this presentation. The result of flight test is not done yet, but will be report later in my thesis for performance of the VHF Data Link system.