What is the difference between an azimuthal scan and an elevation scan in a surveillance radar?

What is the difference between an azimuthal scan and an elevation scan in a surveillance radar?

• A. An azimuth scan sweeps vertically to adjust coverage at different altitudes or distances.
• B. An elevation scan sweeps horizontally to cover a wide arc.
• C. Both scan the same plane; no difference.
• D. An azimuth scan sweeps horizontally to cover a wide arc; an elevation scan sweeps vertically to adjust coverage at different altitudes or distances.

Answer: (D)

The idea being tested is how radar beams are steered in two directions to map where something is. An azimuth scan moves the antenna in the horizontal plane, turning left to right to cover a wide arc around the radar and give you bearing information. An elevation scan tilts the antenna up and down, scanning a vertical slice so you can see targets at different heights and adjust coverage in the vertical dimension. So, describing azimuth as sweeping horizontally for a broad arc and elevation as sweeping vertically to cover different altitudes is the correct way to distinguish the two. In practice, many radars use both scans (often in succession) to build a full 3D picture of a target’s position.

The idea being tested is how radar beams are steered in two directions to map where something is. An azimuth scan moves the antenna in the horizontal plane, turning left to right to cover a wide arc around the radar and give you bearing information. An elevation scan tilts the antenna up and down, scanning a vertical slice so you can see targets at different heights and adjust coverage in the vertical dimension. So, describing azimuth as sweeping horizontally for a broad arc and elevation as sweeping vertically to cover different altitudes is the correct way to distinguish the two. In practice, many radars use both scans (often in succession) to build a full 3D picture of a target’s position.