Which scan type uses a cone-shaped beam optimized for precision target tracking?

• A. Raster
• B. Circular
• C. Unidirectional
• D. Conical

Answer: (D)

A conical scan uses the beam sweeping in a cone around the target, so the antenna traces a circular path at a fixed offset from the target as it rotates. This pattern provides a continuous, directional error signal: as the beam shifts around the target, the received signal strength varies in a predictable way, letting the system determine which direction to move the beam to recenter the target. That constant, surrounding motion is ideal for precise tracking because it continuously checks the target from all azimuth angles and quickly corrects any off-center drift.

Raster scans sweep in lines to image an area, not focused tracking of a single target. Circular scans sweep the beam in a circle but don’t provide the same direct, azimuthal error feedback used for tight tracking. Unidirectional sweeps are single passes without the surrounding feedback needed for precise tracking.