Interference Radio 48 Radar 12 Cellular telephone systems 11 Ionospheric radio wave propagation 10 Global Positioning System 8 Security measures 8 Adaptive antennas 7 Transmitters and transmission 6 Electronics in military engineering 5 Military telecommunication 5 Antenna arrays 4 Fading 4 Prevention 4 Protection 4 Wireless communication systems 4 Information warfare 3 Paths and cycles (Graph theory) 3 Radio wave propagation 3 Switching circuits 3 Artificial satellites in navigation 2 Artificial satellites in telecommunication 2 Celular telephone systems 2 Cognitive radio networks 2 Deep Space Network 2 Electronic noise 2 Identification 2 Millimeter waves 2 Radar targets 2 Radio frequency 2