FGR
I worked 3 years at the SAM Sytem Roland in Germany as a missile operator, maybe the following facts can help a bit.
FGR stands for Führungs-Gefechts-Stand/Fire-Control-Unit
The FGR is a radar which can detect targets at approx. 60 km distance and up to 6000m, it has a 2D Doppler-Radar. The Roland Lunchers (FRR) are connected with a Data Link (wire or radio) to the FGR. So they can see what the FGR does, the FGR can detect up to 127 targets and track 50 of them. The FGR can work with up to 10 Roland II Systems with the Data Link and can be connected to 30 other SAM Systems. A normal Roland SAM group in Germany were six FRR and one FGR, as long the FGR was in search mode, the FRR's didn't use their radars.
In Germany we used four SAM Systems ... Stinger for the close range, Roland for low level 9m up to 3000m and 6km range, Hawk for medium range 3000m up to 13000m, 25km range, and Patriot for long range 13000 up to 45000m and 70km range. All systems worked as one group.
Here you can see the FGR and FRR in action
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