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That's exactly the approach we were taking with Heimdallr Cube Quest Challenge. Separate smaller rad hard processors for specific functions that communicated with each other asynchronously. This was not popular with some. I wish I knew about Karl's thoughts
:) <br>
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Howie AB2S<br>
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Get <a href="https://aka.ms/ghei36">Outlook for Android</a></div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Ground-Station <ground-station-bounces@lists.openresearch.institute> on behalf of Bdale Garbee via Ground-Station <ground-station@lists.openresearch.institute><br>
<b>Sent:</b> Friday, June 1, 2018 11:18:02 AM<br>
<b>To:</b> Robert McGwier; Jonathan Brandenburg<br>
<b>Cc:</b> ground-station@lists.openresearch.institute; Zach Metzinger<br>
<b>Subject:</b> Re: [Ground-station] Satellite program</font>
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<div class="PlainText">Robert McGwier via Ground-Station<br>
<ground-station@lists.openresearch.institute> writes:<br>
<br>
> I can relate the tale that the strongest delivered proclamation I ever<br>
> received from Karl Meinzer was to never attempt this at all. He was<br>
> adamantly opposed to multiple processors and handoffs in spacecraft.<br>
<br>
Yep. He was intense about this in the Phase 5 early meetings.<br>
<br>
I've often thought that if faced with the need to develop a seriously<br>
radiation tolerant IHU, I'd want to at least re-consider Lyle's Am1601<br>
proposal circa 2001. Perhaps an updated derivative, since 32 bit<br>
math is something we mostly take for granted now, and see if it could<br>
be made to fit in a modern rad-hard FPGA. <br>
<br>
Perhaps our lust for on-orbit computation in support of SDR-style signal<br>
processing makes this less attractive today. But I can't help wonder if<br>
there might be immense value in separating control functionality into a<br>
really simple IHU... leaving complex signal processing to happen in<br>
"peripheral" processors that might run with acceptably higher radiation<br>
risk since they could be "drop kicked" when needed? <br>
<br>
[shrug] Food for thought.<br>
<br>
73 - Bdale, KB0G<br>
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