The Beacon receiver in Neustrelitz (53.3°N / 13.1°E / 116 m) is monitoring TEC since 2007. The relative, i.e. uncalibrated TEC, is derived by computing the differential phase of both transmitted signals at 150 and 400 MHz.
Next to measuring the signal strength, the scintillation index S4, a measure of signal strength fluctuations, is also presented. Furthermore the projected measurement path between the beacon receiver at DLR Neustrelitz and the respective satellite is shown.