Depression angle of surface target
depAng = depressionang(H,R)
depAng = depressionang(H,R,MODEL)
depAng = depressionang(H,R,MODEL,Re)
depAng = depressionang(H,R) returns the depression angle from the horizontal at an altitude of 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.
Height of the sensor above the surface, in meters. This argument can be a scalar or a vector. If both H and R are nonscalar, they must have the same dimensions.
Distance in meters from the sensor to the surface target. This argument can be a scalar or a vector. If both H and R are nonscalar, they must have the same dimensions. R must be between H and the horizon range determined by H.
Earth model, as one of | 'Curved' | 'Flat' |.
Effective earth radius in meters. This argument requires a positive scalar value.
Default: effearthradius, which is approximately 4/3 times the actual earth radius
Depression angle, in degrees, from the horizontal at the sensor altitude toward surface targets R meters from the sensor. The dimensions of depAng are the larger of size(H) and size(R).
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);
 Long, Maurice W. Radar Reflectivity of Land and Sea, 3rd Ed. Boston: Artech House, 2001.
 Ward, J. "Space-Time Adaptive Processing for Airborne Radar Data Systems," Technical Report 1015, MIT Lincoln Laboratory, December, 1994.