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@btinternet.com To: AMSAT BB amsat-bb@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

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