Figure 1-1.Radar surface angular measurements.
The pulses that are sent out by the radar and are received back from the target.
The air or surface contact that provides an echo.
The direction of the north geographical pole.
The angle measured clockwise from true north in the horizontal plane.
The length of the line from the radar set directly to the object.
All angles in the up direction, measured in a secondary imaginary plane.
The angle between the horizontal plane and the line of sight.
The surface of the Earth, represented by an imaginary flat plane which is
tangent (or parallel) to the Earths surface at that location.
Table 1-1.Radar Reference Coordinate Terms