TM 11-5840-281-12-1
4-28. CIRCUIT ALINEMENT. (CONT)
DETERMINING ELEVATION CURSOR ALINEMENT ANGLE (CONT)
1.
Determine sine elevation 5-mile intercept angle (A) using following equation:
Sine of angle A = D x sine (Angle GP Angle GA)
D + 30,400
where
D
= distance from radar set group to td (para 4-26)
Angle GP = glidepath angle in degrees
Angle GA = elevation ground angle in degrees (para 4-25).
When elevation ground angle is negative, add it to glidepath angle. When elevation ground angle is positive, subtract it
from glidepath angle.
2.
After sine of elevation 5-mile Intercept angle (A) has been determined, convert it to the nearest tenth of a degree
using following table.
ANGLE
SINE
ANGLE
SINE
0.0
0.00000
3.0
0.05234
0.1
0.00175
3.1
0.05408
0.2
0.00349
3.2
0.05582
0.3
0.00524
3.3
0.05756
0.4
0.00698
3.4
0.05931
0.5
0.00873
3.5
0.06105
0.6
0.01047
3.6
0.06279
0.7
0.01222
3.7
0.06453
0.8
0.01396
3.8
0.06627
0.9
0.01571
3.9
0.06802
1.0
0.01745
4.0
0.06976
1.1
0.01920
4.1
0.07150
1.2
0.02094
4.2
0.07324
1.3
0.02269
4.3
0.07498
1.4
0.02443
4.4
0.07672
1.5
0.02618
4.5
0.07846
1.6
0.02792
4.6
0.08020
1.7
0.02967
4.7
0.08194
1.8
0.03141
4.8
0.08368
1.9
0.03316
4.9
0.08542
2.0
0.03490
5.0
0.08716
2.1
0.03664
5.1
0.08889
2.2
0.03839
5.2
0.09063
2.3
0.04013
5.3
0.09237
2.4
0.04188
5.4
0.09411
2.5
0.04362
5.5
0.09585
2.6
0.04536
5.6
0.09758
2.7
0.04711
5.7
0.09932
2.8
0.04885
5.8
0.10106
2.9
0.05059
5.9
0.10279
4-90
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