Which ES capability directly aids locating a threat emitter?

• A. Signal detection.
• B. Signal characterization.
• C. Direction finding (geolocation).
• D. Jamming.

Answer: (C)

Locating a threat emitter hinges on finding out where the signal is coming from. Direction finding supplies the bearing or angle of arrival to the source, which is the direct input needed to geolocate the emitter. With one sensor you get a line of bearing; with multiple sensors you can intersect those bearings or use timing differences to triangulate the emitter’s position. Signal detection only indicates a signal is present, not its location. Signal characterization tells you attributes of the signal (like frequency or waveform) to identify the emitter, but not its position by itself. Jamming is about disrupting the signal, not locating it. So the capability that directly aids locating an emitter is direction finding.