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35
Figure 9.2.1
An angular error occurs when the target's path
is not parallel to the radar antenna .
Small angles (less than 10°) have little effect on accuracy . As the angle
increases, the displayed target velocity erroneously decreases, as the
following table, Table 9 .2 .1, shows . At 90°, the target velocity is 0—
grossly incorrect .
You will see numbers such as these if you do not set the horizontal
angle compensation option in the software menu . (For how, see
Section 7 .2 Horizontal Angle Compensation .)
Horizontal Angle Degrees
Actual
velocity
in f/s
0
1º
3º
5º
10º
15º
20º
30º
45º
60º
90º
Displayed speed:
3
3 .0
3 .0
3 .0
3 .0
3 .0
2 .9
2 .8
2 .6
2 .1
1 .5
0 .0
5
5 .0
5 .0
5 .0
5 .0
4 .9
4 .8
4 .7
4 .3
3 .5
2 .5
0 .0
7
7 .0
7 .0
7 .0
7 .0
6 .9
6 .8
6 .6
6 .1
4 .9
3 .5
0 .0
9
9 .0
9 .0
9 .0
9 .0
8 .9
8 .7
8 .5
7 .8
6 .4
4 .5
0 .0
11
11 .0 11 .0 11 .0 11 .0 10 .8 10 .6 10 .3
9 .5
7 .8
5 .5
0 .0
13
13 .0 13 .0 13 .0 13 .0 12 .8 12 .6 12 .2 11 .3
9 .2
6 .5
0 .0
15
15 .0 15 .0 15 .0 14 .9 14 .8 14 .5 14 .1 13 .0 10 .6
7 .5
0 .0
17
17 .0 17 .0 17 .0 16 .9 16 .7 16 .4 16 .0 14 .7 12 .0
8 .5
0 .0
19
19 .0 19 .0 19 .0 18 .9 18 .7 18 .4 17 .9 16 .5 13 .4
9 .5
0 .0
21
21 .0 21 .0 21 .0 20 .9 20 .7 20 .3 19 .7 18 .2 14 .8 10 .5 0 .0
23
23 .0 23 .0 23 .0 22 .9 22 .7 22 .2 21 .6 19 .9 16 .3 11 .5 0 .0
25
25 .0 25 .0 25 .0 24 .9 24 .6 24 .1 23 .5 21 .7 17 .7 12 .5 0 .0
Table 9.2.1
Actual and displayed velocities at antenna-to-target angles
