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Measuring satellite end-to-end group delay

Posted: 28 Feb 2011     Print Version  Bookmark and Share

Keywords:transponder channels 

There is increasing demand for bandwidth on satellite systems, as with almost all telecoms systems, due to growing levels of Internet traffic, digital TV and other digital services being carried on these links. Consequently satellite operators are being forced to use all of the available bandwidth right up to the band edges, where signal quality can be degraded by components such as filters within the satellite transponder and the ground systems within the transmission path.

Established satellite transponders are typically configured with channel bandwidths in the range 36 MHz to 72 MHz – depending on the particular satellite system – although it is not unusual for newer systems to be configured with bandwidths of several hundreds of megahertz.

The relative group delay measurement across the bandwidth of these transponder channels is important, in order to determine the amount of distortion or signal degradation that could take place due to increased delay changes at the band edges of these channels. The delay must be measured in order to apply accurate compensation and thus avoid possible data corruption.

View the PDF document for more information.





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