🔍 Key Concepts
• MTI (Moving Target Indicator) function in marine RADAR systems
• Difference between mixer, filter, and detector stages in a RADAR receiver
• How RADAR distinguishes moving vs stationary (fixed-clutter) targets
💭 Think About
• Ask yourself: What is the primary job of an MTI circuit in radar—does it combine signals, remove unwanted echoes, or simply measure interference?
• Think about harbor or near‑shore navigation: what problem does MTI help solve when there are many land or sea clutter echoes?
• Which answer choice best describes an operation that would make moving ships stand out more clearly against fixed background returns?
✅ Before You Answer
• Verify which stage of the RADAR receiver normally acts as a mixer (hint: usually at the front end to create an intermediate frequency).
• Check which device/function is specifically designed to reduce or cancel fixed or stationary clutter on the screen.
• Confirm whether MTI is supposed to highlight moving targets or non‑moving targets before choosing.