Documentation |
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.
depAng = depressionang(H,R,MODEL) specifies the earth model used to compute the depression angle. MODEL is either 'Flat' or 'Curved'.
depAng = depressionang(H,R,MODEL,Re) specifies the effective earth radius. Effective earth radius applies to a curved earth model. When MODEL is 'Flat', the function ignores Re.
H |
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. |
R |
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. |
MODEL |
Earth model, as one of | 'Curved' | 'Flat' |. Default: 'Curved' |
Re |
Effective earth radius in meters. This argument requires a positive scalar value. Default: effearthradius, which is approximately 4/3 times the actual earth radius |
depAng |
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);
[1] Long, Maurice W. Radar Reflectivity of Land and Sea, 3rd Ed. Boston: Artech House, 2001.
[2] Ward, J. "Space-Time Adaptive Processing for Airborne Radar Data Systems," Technical Report 1015, MIT Lincoln Laboratory, December, 1994.