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Currently the SWACI services are migrated to the Ionosphere Monitoring and Prediction Center (IMPC). This may cause downtimes of several products or parts of this webpage. To get latest news and product updates please visit impc.dlr.de!

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Beacon Measurements

Radio Beacons used in SWACI are coherent radio waves at 150 and 400 MHz transmitted by several satellites of LEO-systems such as:

  • NIMS (Navy Ionospheric Monitoring Systems)


When computing the differential phase of both signals, the relative, i.e. uncalibrated TEC may be derived. While measuring the signal strength, the scintillation index S4, a measure of signal strength fluctuations, is also estimated.
The reception is performed by the receiver ITS30S which has been especially developed for beacon measurements by Northwest Research Associates, Inc