Phase analysis of a geosynchronous satellite Ku band beacon

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David Lonard

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Aug 9, 2021, 1:19:07 PM8/9/21
to Amateur radio interferometry
Hello everyone,

I did some analysis of the SES2 geostationary satellite's beacon at 11.701 GHz using my XTRX based interferometer with some modified Ku band lnbs.

Tropospheric perturbations on the carrier are evident. See the attached file.

David

SES2 beacon analysis 8-9-2021.pdf

David Lonard

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Aug 9, 2021, 4:41:12 PM8/9/21
to Amateur radio interferometry
I would also add that by using a cross correlator, I can see the phase noise spreading out in frequency for many satellite carriers and of other narrow band carriers much more clearly than I can with a single channel receiver.

In a cross correlator, all noise that is not common to the carrier being measured will 'disappear' with sufficient averaging, isolating the energy coming from the transmitted carrier signal. The examples in the above document are not averaged, so I think I might be over-estimating phase noise here. 

Some links:



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