Filter
Top Products
TECHNICAL DESCRIPTION INTRAC-305
Page 62 INTRAC-305 MANUAL - Issue 3.2 © 2011 Advantech Wireless
The Basic algorithm available in the Rapid Model Generation
table is not of NORAD origin. It has none of the
embellishments found in the NORAD routines and is meant for
test purposes only.
Once the orbital model has been built using the ephemeris
data the INTRAC tracks the satellite from it and updates and
improves it over the following hours and days.
PROGRAM TRACK The IESS-412 and NORAD data can also be used by INTRAC
to calculate the satellite’s path which is then used for a simple
Program Track operation.
The selections available in Models - program Track are the
same as are available in Rapid Model Generate. On selecting
the required algorithm and pressing ENTER the INTRAC
enters Program Track mode.
Program Track is an open loop method of tracking and as such
is unable to correct for any transducer errors or distortions to
the antenna caused by wind.
RESERVE MODEL Once the orbital model has been built the INTRAC tracks the
satellite extremely accurately by continuously monitoring the
satellite’s position and updating the model. When the beacon
signal is not present INTRAC can still track accurately by
predicting the satellite’s position from the model. However if
the beacon signal is lost for more than 72hrs INTRAC deems
the model to be no longer valid. In such a situation INTRAC
can fall back to a Reserve Model. This is a Program Track
model built from either the IESS-412 or the NORAD data. The
selection is made in Models - Reserve Model. Assuming the
appropriated data has been loaded and is valid INTRAC will
automatically fall back to this model when it can no longer
predict accurately.
CLEAR MODELS The “Clear Models” menu is used to clear one or more of the
INTRAC Model, the IESS-412 Model or the NORAD model.
Clearing the INTRAC Model clears the current satellite model.
Selecting Auto Continue after this clearing will cause the
INTRAC to enter Learning Mode.
Clearing the IESS-412 or NORAD Models simply marks the
ephemeris data as being no longer valid. Selecting IESS-412
or NORAD for Rapid Model Generate or Program Track will
cause the menu to jump to the Edit IESS or NORAD data
menus for new data to be input. Also clearing the data will
mean that Reserve Model will not function.
ANTENNA MOTION LIMITS The INTRAC-305 has user setable software limits to confine
the antenna movement. If a limit is reached in an automatic
mode drive is inhibited, the INTRAC emters Standby Mode, a
primary alarm is raised and the System Alarm indicator is