Calian SatService sat-nms ACU2-19V2 User Manual Download Page 30

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OFF --- No tracking is performed.
STEP --- Step track mode. In regular intervals, the antenna performs small search steps
to optimize the pointing. Chapter

'8.3.0 Step Track'

gives more information about this

mode.
STEP-TLE --- The antenna tries to optimize its pointing like in STEP mode. If the level of
the received signal is too low for this optimization, the antenna moves along the path
calculated from a TLE parameter set instead.
STEP-I11 --- The antenna tries to optimize its pointing like in STEP mode. If the level of
the received signal is too low for this optimization, the antenna moves along the path
calculated from an Intelsat 11 parameter set instead.
MEMORY --- The antenna tries to optimize its pointing like in STEP mode. If the level of
the received signal is too low for this optimization, the antenna moves to the position it
had exactly one siderian day before.
ADAPTIVE --- The adaptive tracking mode works the same way as step track, but it
additionally is capable to predict the satellite's position when the beacon reception fails.
It computes mathematical models of the satellites motion from the step track results
recorded over a certain time. Details about this tracking mode are given in chapter

'8.4.0 Adaptive Tracking'

PROGRAM --- The program tracking mode is different from the modes above. The ACU
moves the antenna along a path which is described in a data file. No beacon reception
is required for this. You have to create such a data file and copy it with FTP to the ACU
before you can use this mode. SatService GmbH provides a PC software which lets you
easily create data files for program track from commonly used ephemeris data sets for
geostationary satellites. Chapter

'8.5.0 Program Tracking'

describes this tracking mode

more detailed.
TLE --- The antenna moves along a path calculated from a TLE ephemeris data set.
There are no optimization steps and no receive signal is required for such an
optimization.
I11 --- The antenna moves along a path calculated from an Intelsat 11 parameter data
set. There are no optimization steps and no receive signal is required for such an
optimization.

Initial pointing mode --- The initial pointing mode specifies how the antenna finds its initial
position before it starts the tracking mode selected with the setting above. This parameter
only has an effect, when a target memory gets recalled. Changing the initial pointing mode
does not re-position the antenna. Possible selection are:

STORED-POSTION --- The antenna moves to the Az/El/Pol angles stored for the
particular satellite. After this position has been reached, the tracking selected by the
'tracking mode' is started.
ORBIT --- The antenna's Az/El/Pol angles are calculated from the satellite's orbit
position stored in the recalled target memory. The 'target azimuth offset' and 'target
elevation offset' values described later on this page are added to the calculated angled
before they are applied. After the commanded position has been reached, the tracking
selected by the 'tracking mode' is started.
TLE --- The antenna's Az/El angles are calculated from the TLE data set selected in the
recalled target memory. The 'target azimuth offset' and 'target elevation offset' values
described later on this page are added to the calculated angled before they are
applied. The Pol angle is set to its stored position in this mode. After the commanded
position has been reached, the tracking selected by the 'tracking mode' is started.
I11 --- The antenna's Az/El angles are calculated from the I11 data set selected in the
recalled target memory. The 'target azimuth offset' and 'target elevation offset' values
described later on this page are added to the calculated angled before they are