How does the radar system reduce ground clutter in its displays?

• A. Doppler processing
• B. All of the above
• C. Filtering of stationary echoes
• D. Clutter suppression

Answer: (B)

Ground clutter reduction relies on separating real moving targets from the many stationary returns such as terrain and structures. Doppler processing, often implemented as moving target indication, uses the Doppler shift to distinguish motion; stationary clutter has near-zero Doppler, so applying a Doppler filter suppresses those echoes while moving targets pass through to the display. Filtering of stationary echoes is a direct way to remove or diminish non-moving returns, further cleaning the scene by discarding echoes with little or no Doppler content. Clutter suppression refers to the broader set of techniques, including adaptive filters and processing methods that continuously adapt to the clutter environment to reduce its impact on targets. Because each method contributes to reducing clutter, using them together provides the most effective clutter reduction, which is why all of the above is the best answer.