[Ground-station] Satellite program

[Bruce Perens]

It would be great for LEO. I have a whole community telling me not to do
LEO, so I have to look at other solutions. I agree It feels silly paying
$700 for a 50 MHz CPU. If this chip goes out off production we would have
to turn to a gate array implementation.

On Tue, May 29, 2018, 05:05 Zach Metzinger via Ground-Station
<ground-station at lists.openresearch.institute> wrote:

> On Mon, May 28, 2018 at 11:23:00AM -0700, Bruce Perens wrote:
> > Please take a look at the Vorago VA10820. We can afford it. A board
> design
> > we can copy exists in their tech notes and Open Source software supports
> > it. Rather than redundant CPUs,  it triples all registers. It runs at
> only
> > 50 MHz so maybe is not your communications processor.
>
> Hello Bruce,
>
> While AMSAT can likely afford the VA10820, a silicon-on-insulator design,
> other groups might not be able to do so. One is also concerend about the
> long-term availability of this part, lack of performance versus cost, and
> the lack of a CAN controller for forward-looking spacecraft bus designs.
>
> The TI TMS570 "Hercules" processors implement lock-step dual processors
> with automatic fault detection and EDAC for flash. SRAM, and peripheral
> FIFOs.
> They are designed to handle SEUs in safety-of-life missions such as
> automotive ABS and SRS applications. Highlights of this processor can be
> found
> in the AMSAT 2018 Symposium proceedings.
>
> This is quite the step up from the Fox-series "commodity" processors, for
> the about $20 per chip.
>
> This, combined with the redundant primary/secondary design of the RT-IHU,
> provides an experimental platform for future low-cost, but
> high-reliability,
> IHUs for those organizations with shallower pockets than AMSAT.
>
> We are about 85% complete with the layout of the initial prototype and
> expect
> to be testing real hardware sometime in late June.
>
> (I am not on the openresearch list, btw.)
>
> --- Zach
> N0ZGO
>
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