Calculate visibilities with datalink horizon masks

You may want to constraint the visibilities between satellites with datalink horizon masks.

First create a datalink in one of the satellites, e.g. Sentinel-2A. Do it with the datalink wizard, making sure the datalink is of type VIA DRS.
Still in the datalink wizard, create a horizon mask by inserting the following string of azimuth - elevation pairs:

5.00, -40.00 ;5.00, -33.00 ;16.00, -33.00 ;16.00, -11.00 ;26.00, -11.00 ;26.00, -0.50 ;184.00, -0.50 ;184.00, -10.00 ;200.00, -10.00 ;200.00, -86.50 ;300.00, -86.50 ;300.00, -40.00

Still in the datalink wizard, make sure the mask action is set to "MASK ABOVE"

Follow the wizard till the end and verify the new datalink appears on the satellite tree. Make sure the datalink is enabled.

On the scenario tree, click on the datalink to open the properties pane, and select the datalink horizon mask properties.
Enable the horizon mask sphere and the Az El labels. This will make the horizon mask visible on the map as shown in the figure below. The side in red shows the directions where contact is not allowed, the side in green shows where contacts are possible.

Now use the orbit wizard to create a geostationary satellite in longitude 0, and call it DRS.

Make sure the new satellite DRS appears on the scenario tree, and select it visible.
Now obtain the timeline of visibilities between Sentinel-2A and the new satellite DRS.

The new timeline complies with the datalink horizon profile. Verify it manually on the map and the Gantt, using the Hot Track function.

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