How would you handle a contact that continuously shows up on the radar but is not a real target (electromagnetic interference)?

• A. Confirm with other sensors, check for interference sources, and apply MTI/CFAR to separate real targets
• B. Ignore the contact
• C. Increase radar gain
• D. Switch to passive mode

Answer: (A)

When a contact keeps showing up but isn’t a real target, the best approach is to verify through multiple sources and use targeted signal processing to separate real targets from clutter. First, check with other sensors or systems to see if the contact is corroborated there. If it isn’t, you may be dealing with interference rather than a real object. Next, identify potential interference sources in the environment or on the platform that could be generating a persistent signal. Finally, apply the radar processing tools designed to distinguish moving targets from stationary or slowly moving clutter: Moving Target Indication helps suppress stationary or near-stationary signals by focusing on Doppler shifts associated with real motion, and Constant False Alarm Rate adaptively sets detection thresholds to keep alarms consistent in the presence of clutter. Real targets typically produce a detectable Doppler signature and a track across sweeps, while interference tends to remain fixed or vary irregularly and will fade when MTI/CFAR are applied. Together with cross-sensor verification and interference source mitigation, this approach reduces false contacts without missing genuine targets.

Ignoring the contact, cranking up gain, or switching to passive mode would either miss real threats, worsen interference, or remove the active sensing capability entirely, making them unsuitable in this scenario.