Electromagnetic Sensor (EMS), Active
Sophisticated form of radar. The signals from the EMS are subjected to aggressive computer analysis for detailed information. The unit projects radio pulses in sweeping scans of an area and interprets the returned signals (echoes) for information about an object's size, distance, and speed.
“Traveller 5.10 Core Rules Book 3 : Worlds and Adventures”, Miller, Marc , Far Future Enterprises