NAV Portugal uses different types of air traffic management support systems:

Surveillance Systems: 

Secondary radars;
Primary radars;
Ground radars.

Communication Systems: 
Tower control desks; 
Radio-relay links;
VHF/UHF transmitters;
Voice and data recorders.

Navigation Systems: 
ILS (Instrument Landing Systems);
VOR (VHF Omnidirectional Range);
DME (Distance Measuring Equipment);
NDB (Non Directional Beacon)