1-2
Figure 1-1.—Radar surface angular measurements.
Term
Definition
Energy pulses
The pulses that are sent out by the radar and are received back from the target.
Reflecting target
The air or surface contact that provides an echo.
True north
The direction of the north geographical pole.
True bearing/azimuth
The angle measured clockwise from true north in the horizontal plane.
Line-of-sight range
The length of the line from the radar set directly to the object.
Vertical plane
All angles in the up direction, measured in a secondary imaginary plane.
Elevation angle
The angle between the horizontal plane and the line of sight.
Horizontal plane
The surface of the Earth, represented by an imaginary flat plane which is
tangent (or parallel) to the Earth’s surface at that location.
Table 1-1.—Radar Reference Coordinate Terms
