What is the disadvantage of an alpha scan radar?

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Prepare for the VT-IV Navigation Familiarization Exam II. Master navigation techniques with flashcards and multiple choice questions, with each answer fully explained. Boost your confidence and ace your exam!

Multiple Choice

What is the disadvantage of an alpha scan radar?

Explanation:
With alpha scan, the antenna moves through a series of predefined angular positions, spending a dwell time at each to collect returns before stepping to the next position. Because the full sweep is built up by many small steps rather than a continuous, fast rotation, the time needed to refresh the entire 360-degree picture is longer. That leads to a relatively slow update rate on the display, which can make fast-moving targets harder to track and new targets slower to appear.

With alpha scan, the antenna moves through a series of predefined angular positions, spending a dwell time at each to collect returns before stepping to the next position. Because the full sweep is built up by many small steps rather than a continuous, fast rotation, the time needed to refresh the entire 360-degree picture is longer. That leads to a relatively slow update rate on the display, which can make fast-moving targets harder to track and new targets slower to appear.

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