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RC4000 ACU Boardset
4) Use the following formula to calculate the Elev Constant:
( (CNT_2 - CNT_1) / (DEG_2 - DEG_1) ) * 57.29
If the result is negative, change the sign to positive. Here is an example:
Higher Position
Lower Position
Difference
(32227 / 20.4) * 57.29 = 9062 pulses/radian
The azimuth scale factor is obtained by noting the difference in the azimuth pointing solution
angles between two satellites and the pulse counts when on the satellites. For best results, use
satellites that are as far apart as possible and make sure you have positively identified the
satellites.
Example : Kansas City (38'56N,94'45W) heading of 180.0
SATELLITE
SPACENET 2 (69.0W)
SATCOM C5 (135.0W)
Difference
(22333 / 90.9) * 57.29 = 14075 pulses/radian
SCALE FACTOR FOR RESOLVER SYSTEMS
The RC4000 uses the actual digitized resolver count in the same way it uses a pulse count. The RC4000
utilizes a 16 bit resolver to digital converter which generates a count value from 0 to 65,535. Typically the
resolver sensor rotates with the antenna. The resulting "pulse scale factor" therefore is:
65536 reslover counts / ( 360 degrees * 1 radian/57.29 degrees) = 10430.2 "pulses" / radian
The default scale factor for a resolver system is therefore rounded up to 10431.
The constants are entered via the azimuth count movement (3.3.1.3.3) and elevation count movement
(3.3.1.3.6) configuration item screens.
Chapter 4
Inclinometer
Pulse
Angle
Count
50.2
32768
29.8
541
20.4
32227
AZIMUTH POINTING
SOLUTION ANGLE
-37.5
53.4
90.9
161
PULSE
COUNT
33333
11000
22333
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