[amsat-bb] Re: Technical question about radar reflectivity

[g0mrf at aol.com]

It's really cross sectional area rather than length.  Can't really 
assume military radar is on a specific frequency.

I think what perhaps should be avoided is the use of any angular 
surfaces in the body designed to keep the cubesat either in orbit or to 
help it pass through the atmosphere. i.e. sample return missions or 
atmospheric 'skipping'

Similarly, the use of titanium and heat resistant ceramics should be 
avoided although that is too specific for legislation. Perhaps....Not 
designed for atmospheric re entry, would be better.

Sorry, back to  the topic, angular surfaces and radar absorbing 
coatings not a good idea.

Thanks es gl

David G0MRF


-----Original Message-----
From: Graham Shirville <g.shirville at btinternet.com>
To: AMSAT BB <amsat-bb at amsat.org>
Sent: Tue, 7 Aug 2012 22:32
Subject: [amsat-bb] Technical question about radar reflectivity


Hi All,

I am preparing a response to the UK Space Agency Consultation Document 
on the
planned Reform of the UK Outer Space Act. Generally the proposals 
appear to
support cubesat development here in the UK  and therefore should be 
supported.

Included in the Impact Assessment document that comes with the 
Consultation
Document is a finding that “ Further, cubesat designers should be 
encouraged to
incorporate appropriate reflectors on the outside of their platforms to 
enhance
their radar cross-section/signatures and therefore their detectability 
from the
ground in order to minimise the potential collision risk with other 
operational
satellites.”

Would I be technically correct to be able to state something along the 
lines
of...  “Many/most cubesat platforms have communication systems that use
frequencies in the 435-438MHz amateur satellite service and use 
projecting 1/4
wave  monopole  or 1/2 wave dipole antennas. As these frequencies are 
adjacent
to those used by many of the ground based radars used for tracking 
space
objects, it can be demonstrated that this finding is being and will be
satisfied”

I assume that their reflection will be enhanced by these antennas but 
want to
make certain of the facts ..... so expert comments please.

thanks

Graham
G3VZV

_______________________________________________
Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite 
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb