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11-APR-06 Rev E OMACS3000
26 of 51
System Screens
Figure 18: Select Base Satellite Screen
Peak on Base Satellite
Once the satellite base is chosen, the antenna controller operator must peak up on that satellite. If the
beacon receiver is connected, the readings from the beacon level may be used to peak. Otherwise, the
operator must use another source to identify when the antenna is peaked on the satellite, refer to the satellite
acquisition procedure below. The operator may select and change from fast (slew) to slow (track) to facilitate
peaking. The azimuth and elevation initially displayed in the Satellite Info Box when this screen comes up
are the computed look angles of the antenna that should result in the satellite peak. The displayed az and el
on the top of the screen are NOT valid position readings as the resolvers have not been calibrated yet. If the
operator has more accurate antenna look angles for the antenna when it is peaked, he may modify the look
angles in the Satellite Info Box and use the more accurate angles to set the az and el offsets.
The satellite may be acquired by first noting in
Figure 19
that the current azimuth and elevation
(uncalibrated) resolver readings are 180.63° and 45.64° respectively and the selected base satellite, Norad
ID 25516, pointing angles to the satellite are an azimuth of 149.769° and an elevation angle of 47.200°. The
satellite acquisition requires the operator to:
1. Determine the actual antenna pointing angles corresponding to the indicated angles in
Figure 19
(Az of 180.63° and El of 45.64°)
2. Determining the course correction factors or the difference between the position readouts and the
actual antenna pointing angles
3. Correcting the required base satellite pointing angles
4. Peaking on the satellite.
The actual antenna pointing angles may be determined by using an inclinometer for the elevation pointing
angle and using the antenna foundation dead heading or a compass to determine the antenna azimuth
angle.