Moving Target Detection (MTD) is used to determine whether video returns are ground based on what comparison?

• A. Zero Doppler returns against a clutter map
• B. Doppler frequency against weather data
• C. Range returns against terrain map
• D. Manual inspection

Answer: (A)

MTD distinguishes stationary ground clutter from moving targets by using Doppler information alongside a stored map of where ground clutter typically appears. Ground returns generally have near-zero Doppler because the ground isn’t moving relative to the radar. A clutter map records these zero-Doppler return locations over time. By comparing the current Doppler content of video returns to this clutter map, those that match zero Doppler and align with known ground clutter are classified as ground, while returns with non-zero Doppler or that don’t fit the clutter map stand out as potential moving targets. This is why comparing zero Doppler returns against a clutter map is the method used in MTD. The other options don’t fit because they either don’t use zero Doppler with a clutter model, or they rely on different data or manual inspection rather than the Doppler-clutter approach.