Sea clutter mitigation methods typically include which approach?

• A. CFAR/gating
• B. Doppler processing
• C. MTI/clutter suppression
• D. Pulse compression

Answer: (C)

Sea clutter mitigation relies on separating moving targets from the rough, nearly stationary sea surface returns. The best approach is MTI (moving target indication) with clutter suppression. This technique uses Doppler processing to distinguish energy from clutter (which sits at near-zero Doppler because the sea surface is largely stationary over short times) from energy from moving targets (which has nonzero Doppler). By canceling or subtracting the stationary clutter across successive pulses, MTI reduces the sea clutter level and makes moving targets more detectable.

Doppler processing is the broader concept behind MTI, but on its own it doesn’t specify how clutter is removed. CFAR/gating adjusts detection thresholds in cluttered environments but doesn’t actively suppress clutter, and pulse compression mainly improves range resolution and SNR rather than reducing sea clutter.