[Ground-station] Satellite program

Bruce Perens bruce at perens.com
Fri Jun 1 14:19:03 EDT 2018


Bdale,

Do you happen to know where there's a copy of Karl's old proposal?

Finding a viable part is important. There are consumer or industrial parts
that we may choose to trust based upon someone else's testing and our
understanding of their architecture. The most common seems to be a
Microsemi (formerly Actel) part that is reported upon here:
https://www.hevs.ch/media/document/1/20130612_cof_igloo-for-cubesat_1.pdf
This goes to 40 krad.
Parts that are specified as rad-hard seem to start in the $2000s and go up
from there. Do you know of less expensive ones?

Having a separate communications processor seems to be a good plan, as long
as we have a fallback position to operate the satellite if that processor
fails.

    Thanks

    Bruce

On Fri, Jun 1, 2018 at 8:18 AM, Bdale Garbee via Ground-Station <
ground-station at lists.openresearch.institute> wrote:

> Robert McGwier via Ground-Station
> <ground-station at lists.openresearch.institute> writes:
>
> > I can relate the tale that the strongest delivered proclamation I ever
> > received from Karl Meinzer was to never attempt this at all.  He was
> > adamantly opposed to multiple processors and handoffs in spacecraft.
>
> Yep.  He was intense about this in the Phase 5 early meetings.
>
> I've often thought that if faced with the need to develop a seriously
> radiation tolerant IHU, I'd want to at least re-consider Lyle's Am1601
> proposal circa 2001.  Perhaps an updated derivative, since 32 bit
> math is something we mostly take for granted now, and see if it could
> be made to fit in a modern rad-hard FPGA.
>
> Perhaps our lust for on-orbit computation in support of SDR-style signal
> processing makes this less attractive today.  But I can't help wonder if
> there might be immense value in separating control functionality into a
> really simple IHU... leaving complex signal processing to happen in
> "peripheral" processors that might run with acceptably higher radiation
> risk since they could be "drop kicked" when needed?
>
> [shrug]  Food for thought.
>
> 73 - Bdale, KB0G
>
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>


-- 
Bruce Perens K6BP - CEO, Legal Engineering
Standards committee chair, license review committee member, co-founder,
Open Source Initiative
President, Open Research Institute; Board Member, Fashion Freedom
Initiative.
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