RESEARCH CONCEPTS RC3000 Manuel d'utilisateur télécharger pdf (Page 8)

RC3000 Antenna Controller Appendix TLE Two Line Element Tracking

TLE-8

3.2.2.9.6 Ephemeris Track

The EPHEM_TRACK submode may be entered via two conditions:

1 – while STEP tracking, signal strength is lost or

2 – at TRACK initialization, the track_signal_source item is set to NONE

For the second case where no signal source is available, TRACK will enter a manual jog screen which

allows the user to jog the antenna until it is determined it is pointed at the satellite.

AZIM: 8.3 32974 TRACK

ELEV: 35.3 8824 SAT:SBS 4

POL: 71.1 V SPEED:SLOW

PEAKUP MANUALLY <ENTER>TLE TRACK

When the user presses the ENTER key, the controller will assume it is peaked up on the satellite. The

controller will then predict the azimuth and elevation position of the satellite and calculate offsets to be

used by EPHEM TRACK. This offset calculation is the same as is done when the first STEP TRACK is

done (if signal strength is available).

After entering EPHEM TRACK, the controller’s actions will sequence in a very similar manner as STEP

TRACK. When it is time to move the antenna, EPHEM TRACK will predict the azimuth and elevation

position for the current date and time. The controller will move the antenna the appropriate amount and

again be in IDLE until the next required move.

The EPHEM_TRACK submode will pass control to these TRACK submodes upon the following

conditions:

STEP_TRACK – receives control when signal strength returns ( if track_signal_source is set to SS1 or

SS2)

MEMORY_TRACK – when track table data is available

3.3.1.3.12 Track Factors

SEARCH ENABLE: 1 CONFIG-TRACK

MAX ERROR: 3 HOLDOFF: 120

SEARCH WIDTH: 4 SIG: 0 TIME: 2

SIG: SIGNAL SOURCE <0>NONE <2>SS1 <3>SS2

The TLE option allows the track signal source to be specified as “NONE”. If this value is

specified, TRACK mode will initially go to TRACK-MANUAL instead of STEP TRACK. From

TRACK-MANUAL the user will be required to initiate ephemeris tracking.

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RESEARCH CONCEPTS RC3000 Manuel d'utilisateur Page 8