What do you call the use of contiguous beams stacked in elevation?

The term for the use of contiguous beams stacked in elevation is known as stacked beam radars. This technology involves arranging multiple beams in such a way that they are layered or "stacked" vertically. This configuration allows for enhanced coverage, as each beam can be directed to monitor different elevation angles, improving the ability to detect and track targets over a range of altitudes.

This approach is particularly beneficial in radar systems where tracking multiple objects at various heights is crucial, such as in air traffic control or missile guidance systems. By stacking beams, radar systems can effectively create a three-dimensional view of the airspace, which is essential for precise monitoring and response.

Other terms listed do not specifically refer to the technique of stacking beams in elevation. For example, phased array refers to a certain type of antenna where the beam direction can be electronically altered, but it does not imply that beams are stacked vertically. Truncated and cylindrical paraboloids relate more to antenna shapes and profiles than to the concept of having beams arranged in an elevation stack.