On Mar 2, 2014, at 7:05 AM, Pete Lancashire <[email protected]> wrote:
> Idea. On the next go around for the board put the copper down and holes for
> a couple small daughter cards and any support logic needed to interface
> with the BBB.
> The the only additional cost would be limited to the daughter board I/O
> since my guess it would be SMT hence a bit hard to leave it unpopulated.
Good idea. Also the Beagle spec allows for multiple, stacked interface boards
('capes' they call them). So for a backwards compatible solution an
experimental GPSDO + backup power cape could be interposed between the Beagle
and 5370 board. I say experimental because I have no idea if any of the SDGPS
projects out there would be ultimately suitable for a DO.
This brings up a question I have about how the PPS edge is actually derived by
a GPS receiver. Does it originally come from the NAV data stream and then get
corrected by the (fixed-mode) positioning solution to account for
transmission/system delays? I know about the issue of alignment with the VCTCXO
clock, but I'm talking about upstream of that.
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