Depression angle of surface target
depAng = depressionang(H,R)
depAng = depressionang(H,R,MODEL)
depAng = depressionang(H,R,MODEL,Re)
returns
the depression angle from the horizontal at an altitude of depAng
= depressionang(H
,R
)H
meters
to surface targets. The sensor is H
meters above
the surface. R
is the range from the sensor to
the surface targets. The computation assumes a curved earth model
with an effective earth radius of approximately 4/3 times the actual
earth radius.
specifies
the earth model used to compute the depression angle. depAng
= depressionang(H
,R
,MODEL
)MODEL
is
either 'Flat'
or 'Curved'
.
specifies
the effective earth radius. Effective earth radius applies to a curved
earth model. When depAng
= depressionang(H
,R
,MODEL
,Re
)MODEL
is 'Flat'
,
the function ignores Re
.

Height of the sensor above the surface, in meters. This argument
can be a scalar or a vector. If both 

Distance in meters from the sensor to the surface target. This
argument can be a scalar or a vector. If both 

Earth model, as one of  Default: 

Effective earth radius in meters. This argument requires a positive scalar value. Default: 

Depression angle, in degrees, from the horizontal at the sensor
altitude toward surface targets 
Calculate the depression angle for a ground clutter patch that is 1000 m away from the sensor. The sensor is located on a platform that is 300 m above the ground.
depang = depressionang(300,1000);
[1] Long, Maurice W. Radar Reflectivity of Land and Sea, 3rd Ed. Boston: Artech House, 2001.
[2] Ward, J. "SpaceTime Adaptive Processing for Airborne Radar Data Systems," Technical Report 1015, MIT Lincoln Laboratory, December, 1994.