How does antenna stabilization improve ARPA accuracy?

• A. It increases the radar's maximum range.
• B. It keeps the radar image steady during vessel motion, improving target tracking stability.
• C. It automatically classifies targets.
• D. It reduces power consumption.

Answer: (B)

Antenna stabilization focuses on keeping the radar image steady as the vessel moves. When a ship pitches, rolls, or surges, a fixed antenna would cause the target image to appear to move on the screen. That apparent motion makes it harder for ARPA to measure true range and bearing and to maintain a consistent track.

By counteracting the vessel’s motion, stabilization keeps the scene steady in the display and the target’s position to remain consistent across scans. This reduces blurring and misleading motion in the target returns, allowing the ARPA to calculate more accurate range, bearing, and velocity information and to keep the track reliable even in rough seas. The improved stability directly enhances tracking accuracy and the reliability of collision avoidance calculations.

This doesn’t change the radar’s maximum range, nor does stabilization automatically classify targets, and it isn’t about reducing power use.