Rh = horizonrange(H)
Rh = horizonrange(H,Re)
Rh = horizonrange(___,
Height of radar system above surface, specified as a scalar or a length-M vector. Units are in meters.
Effective earth radius, specified as a positive scalar. Units are in meters
Height of earth surface at the horizon,
specified as a scalar or
length-M vector. This input can
also be interpreted as the height of significant
ground clutter at the horizon. If
Horizon range in meters of radar system at altitude
Find the range to the horizon from an antenna that is 30 m high.
R = horizonrange(30)
The horizon range of a radar system is the distance from the radar system to the earth along a tangent. Beyond the horizon range, the radar system detects no return from the surface through a direct path.
The value of the horizon range is:
where Re is the effective earth radius and H is the altitude of the radar system.
 Long, Maurice W. Radar Reflectivity of Land and Sea, 3rd Ed. Boston: Artech House, 2001.
 Skolnik, M. Introduction to Radar Systems, 3rd Ed. New York: McGraw-Hill, 2001.
Usage notes and limitations:
Does not support variable-size inputs.