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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2
Radar Facts
5-2
AD–12055–R2@
40
20
100
WX
AIRCRAFT HEADING
80
60
+0.6
Positional Relationship of an Airplane and
Storm Cells Ahead as Displayed on Indicator
Figure 5–1
The drawing is laid out to simulate the face of the indicator with the
semicircular range marks. To derive a clearer concept of the picture that
the indicator presents, imagine that the storm is a loaf of sliced bread
standing on end. From a point close to the surface of earth, it towers
to a high–altitude summit. Without upsetting the loaf of bread, the radar
removes a single slice from the middle of the loaf, and places this slice
flat upon the table. Looking at the slice of bread from directly above, a
cross section of the loaf can be seen in its broadest dimension. In the
same manner, the radar beam literally slices out a horizontal cross
section of the storm and displays it as though the viewer was looking
at it from above, as shown in figure 5–2. The height of the slice selected
for display depends upon the altitude and also upon the upward or
downward TILT adjustment made to the antenna.