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Scheduling General setup

After starting VieVS and browsing to Scheduling/General setup the graphical user interface will display something like this: sched_main.png

Here you can specify all settings for your VLBI schedule. If you have troubles reading everything note that you can simply increase the window size.

Station network

You can select your participating stations in the Station network panel. A list of all available stations, which are described in the file, is displayed in the Available listbox. Simply select your stations by clicking on them. They will now appear in the Selected listbox.

If you want to deselect a station mark it and click on the Clear selected button below the Selected listbox.

If you plan to use the same network several times you can save your network via the Save button. Give your network a name and at your next start of VieVS this network will appear in the Predefined listbox. If you want to use one of your predefined networks, simply click on the network name in the Predefined listbox.


In the Parameters panel, you can specify some basic parameters for your schedule. Sundist is the minimum distance allowed between the sun and quasars. All quasars which are closer to this distance will not be scheduled. You can find the information which sources are too close in the output header when you start vie_sched.

Cut-off el means the minimum elevation angle for an observation.

Source specifies the minimum flux density of quasars. Quasars which are weaker will not be scheduled. You can find the information which sources are too weak in the output header when you start vie_sched.

Time options

Simply specify your start date in UTC and your session duration. Usually a session lasts for 24 hours and the start times for real sessions are defined in the scheduling master.


Several optimization strategies are supported.

Source-based strategy

This optimization strategy tries to optimize the distribution of sources from a global viewpoint. This might be a good option for VGOS sessions when you have a lot of fast slewing antennas. You can observe one, two or four sources simultaneously. One source might not be enough if you have a globally distributed network, two sources should work, if you observe four sources simultaneously you will loose a lot of baselines.

Currently it is mostly recommended to use the Station-based strategy instead.

Station-based strategy

This is the most commonly used optimization strategy for geodetic VLBI sessions. Here VieVS tries to optimize the distribution of sources over each stations, which is called the sky coverage.

:!: If you have no idea use this option :!:

It might improve the schedule if you select the Distribute observations over sources checkbox. Only use this if you have a smallish amount of sources which you would like to observe.

Satellite observations

If you want to add observations to satellites read the satellite scheduling manual.


If you want to schedule manually read the wikipage here.


if you check disp sky coverage a image will be displayed at the end of the scheduling creation with an overview of the sky coverage of each station. This image is also ALWAYS saved in your current output directory.

if you check open sched analyzer the scheduling analyzer will be opened automatically at the end of your scheduling creation. More information can be found here.

if you check multi-Scheduling you will use the multi-scheduling tool to create several schedules simultaneously. By clicking at the ? button the multisched.txt file will be opened. More information can be found here.

if you check write log file matlab will not display the output at the command window. Instead you will get corresponding files (header.txt, body.txt, footer.txt) in your output directory.

:!: it is recommended to always write log files.


At the bottom of your GUI window you can find several buttons where you can, for example, Load the newest version of the catalog files or save/load your current scheduling parameters.

Scheduling Minor parameters

If you browse in the VieVS GUI to Scheduling/Minor parameters you will get an windows somewhat similar to this: sched_minor.png Here you can specify some additional parameters.

General parameters

Here you can specify your Experiment name and description which will be written to your .skd file.

:!: Always check the Create and use new source file checkbox, otherwise you will not read in your source based catalogs.

Via the Open param.txt button you can open the param.txt file which stores some very important parameters for the scheduling creation.

:!: Always check your param.txt file, more info can be found here!


In the Bands panel you can specify the observed bands, their wavelength, their number of channels and the minimum requested signal to noise level in decibel.

:!: For normal VLBI sessions leave everything as it is.

Observing mode for twin telescopes

Here you can, in theory, specify how twin telescopes should be scheduled. :!: Please note that this might not be fully working at the moment.

Output options

Select the output files you want to create.


Here you can add some additional conditions to your schedule. Two different strategies are supported.

:!: It is recommended to use the iterative approach rather than the quick fillin approach. This will lead to a slightly longer computation time but is a more rigorous way. If you click on the specify condition button a new window should appear where you can select your condition. sched_conditions.png Simply close this window to submit your condition. If the condition is displayed at the main VieVS GUI below the specify condtion button worked.

Satellite observations

More information about this settings can surely be found here.

public/vievs_manual/scheduling/automatic.txt · Last modified: 2017/06/08 14:11 by mschartn