RC3000 Antenna Controller Appendix TLE Two Line Element Tracking
TLE-2
2.0 INSTALLATION
Ephemeris tracking mechanizes an “open-loop” pointing of the antenna. No signal strength feedback is
used to follow the inclined orbit satellite’s path through the sky.
The need to open loop point the antenna makes correct calibration of the antenna sensors even more
critical. The calibration steps detailed in the baseline manual and basic tracking appendix must be
followed in addition to the few unique steps for ephemeris tracking that are discussed next.
2.3.2 Elevation Calibration
The ephemeris tracking option will estimate the tilt (pitch and roll) of the antenna platform by comparing
the elevation angle determined from the inclinometer with the angle from the elevation resolver. The
inclinometer will always read the elevation angle relative to the local horizontal while the resolver reads
the elevation angle relative to the antenna platform.
In order to correctly estimate the platform’s tilt, the elevation axis must be calibrated while the platform is
level. From this level position, the elevation inclinometer and the elevation resolver sensors must be
calibrated such that they read the same angle. This requirement is discussed in the following examples
where the antenna will be pointed to look at the same satellite.
If the antenna’s platform is setting level with respect to the local horizontal, the elevation angle reported
from the inclinometer and the angle reported from the resolver should be the same and the RC3000 can
determine that there is no tilt. If the antenna’s platform is not level with the local horizontal (as if it is
setting on a hill), the elevation angle from the inclinometer will be the same as in the case but the resolver
angle will be different since the antenna had to be rotated differently to achieve the same RF look angle.
This difference in the two angles can be used to characterize the tilt of the platform.
Therefore, to correctly calibrate the elevation axis the following steps must be performed with platform
perfectly level. From section 2.3.2 of the baseline RC3000 manual, perform steps 3a and 3b to obtain the
same angle derived from the inclinometer and the elevation resolver.
The TILT maintenance routine (see 3.2.2.7.4 of this appendix) should be performed to check the
correctness of the elevation calibration.
(9 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Commentaires sur ces manuels