Airbus Defence and Space Gmbh

European Space Agency

Matthias Soellner

Michael Kirchner

Joachim Schupp

Martin Goetzelmann

A method and apparatus for detecting an Equivalent Isotropically Radiated Power (EIRP) degradation of a satellite radio frequency (RF) transmitter being in a repeating ground track orbit. Sets of signal-to-noise (C/N) and satellite orbit data are obtained from first and second sources. Each data set is associated with the satellite and one of several receivers. Computing temporal information on an elevational and azimuthal satellite direction for each receiver location. A temporal information based time interval is determined for a single ground track. Determining, for each receiver, one of a first plurality of differences between a first time point data set value and a second time point data set value. The two time points differ by the time interval. A first average of the first plurality of differences is computed and compared with a predetermined threshold. A signal is triggered when the computed first average is larger than the threshold.

Near-real time EIRP monitoring device/system

In a method and apparatus for processing a received navigation signal x'(t) of a satellite navigation system, the received navigation signal x&#x2032;(t) contains at least four navigation codes. The navigation codes are modulated by a complex BOC signal and a defined subcarrier frequency such that the resulting signal has a constant amplitude. The resulting signal is then also modulated by means of a carrier signal. The navigation signal x&#x2032;(t) is demodulated and then processed by a complex correlation with at least one reference signal.

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Gauting, Germany

Matthias Soellner