Advantech INTRAC-305 user manual Technical Description, Antenna Motion Limits

TECHNICAL DESCRIPTION	INTRAC-305
	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	the model to be no longer valid.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	ephemeris data as being no longer valid.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

Page 62 INTRAC-305 MANUAL - Issue 3.2 © 2011 Advantech Wireless