Lots of interesting stuff there (sandstorms are mentioned under "Clutter" too). While there is short wavelength radar, most of it is rather longer than the average size of sand particles in a storm. I think anything above "X" on the "Frequency Bands" list there shouldn't be too handicapped by being in a sandstorm.
Thank you very much again.
I think I have got it now, the English Wikipedia page was really helpful, it has
more and more easy to understand informations than the German counterpart
(never ask a German scientist or engineer to explain something, this is an art
they just never learnt - our leading "TV scientist" comes from India ...), I nor-
mally just hesitate to use the English Wikipedia because of the many technical
terms I have to look up in the dictionary ...