passive detection : 26 phrases in 10 subjects |
Astronautics | 2 |
Electronics | 2 |
Metrology | 1 |
Military | 12 |
Mobile and cellular communications | 1 |
Quantum electronics | 1 |
Radioengineering | 1 |
Technology | 4 |
United Nations | 1 |
Weapons of mass destruction | 1 |