The radar system operates in S-band discrete frequencyislands in the range of 2910 - 3350 MHz and scans with two rotating antennas the heightlayers of the airspace two-dimensional (by side and distance). A separate height finder - radar is used to measure the altitude of individually selected targets. For the vertical radar coverage, a third radar antenna is required: a double antenna (Back to Back) for the height overlap "deep - medium" in place of the originally planned "Station Couverture Basse".