What does "slant range" refer to in radar terminology?

Slant range in radar terminology refers to the distance from the radar system to the target while taking into account the altitude of the target. This measurement is typically represented as a straight-line distance, meaning it reflects both the horizontal and vertical components of the distance to the target. In practical terms, when a radar system is tracking an object, it needs to incorporate the target's height in relation to the radar's own position. This is important for accurate distance calculations and understanding the exact position of the target in three-dimensional space.

The other options do not accurately capture the definition of slant range. For instance, a distance measured without altitude consideration overlooks an essential aspect of the target's position, while horizontal and vertical distances alone fail to represent the complete, three-dimensional relationship necessary for radar functions.