<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">I think that some meaningful work of integrating navigation and communication is possible here. I got the idea from some email where someone said something about using the sounding rocket behavior for something. </span></div><div><br></div><div>I had two ideas for experiments</div><div>1. Attach cheap accelerometers to crystal frequency sources and measure the frequency drifts during rapid accelerations. This measurement could provide an error signal somehow to correct the main clock frequency in a system.</div><div>2. It might be combined with something else, maybe a 3DOF Inertial measurement unit that would measure accelerations and maybe autocorrect Doppler shifts that occur during a flight. </div><div>I suspect that these ideas are pretty old in some areas, like ballistic missiles, but getting it to work wouldn’t be that easy. </div><div>I think that some meaningful work of integrating navigation and communication is possible here. </div><div><br></div><div>So, there you go.</div><div><br></div><div>Best</div><div>S</div><div><br><div dir="ltr">Sent from my iPad</div><div dir="ltr"><br><blockquote type="cite">On Apr 4, 2021, at 2:47 PM, Alex Wege via Ground-Station <ground-station@lists.openresearch.institute> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div>>>"Adapting to harsh and changing conditions quickly and reliably is a big systems challenge for us. Is a sounding rocket the right entry point to test this sort of work?"<br></div><div><br></div>I think this is an awesome idea! As a recent graduate of the University of Minnesota rocketry team I can tell you it's difficult to build a perfect telemetry system for a rocket -- especially supersonic ones.<div>They might even appreciate just running some adaptive coding and FEC blocks like in DVB-S2 to improve link stability (assuming they ran into similar issues).</div><div>That would also be an opportunity to test out (by proxy) the dynamics of our adaptive coding system in a stressful environment.</div><div><br></div><div><br></div><div>On a less related note, I think our system would be perfectly suited for any high altitude ballooning teams to experiment with -- that would be really cool to see.</div><div><br></div><div>-KE0RYT</div><div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Apr 4, 2021 at 11:32 AM Jay Francis via Ground-Station <ground-station@lists.openresearch.institute> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Michelle Thompson via Ground-Station wrote on 4/4/21 10:39 AM:<br>
> If we were to propose an FPGA experiment on a sounding rocket (this is <br>
> with a University), what would be the best experiment?<br>
It's probably easier to get FCC STA licenses for sounding rocket <br>
launches than orbital due to the limited duration. I've done it a <br>
couple times now for S-Band telemetry on vehicles. This could be a way <br>
to test very experimental modulation/protocols that might not be <br>
approved for orbital operation.<br>
<br>
Flight testing deployment of very small hardware (similar to Ambasat <br>
size or smaller) may also be possible since there's no orbital debris <br>
tracking issues. It could be interesting to have a sounding rocket <br>
deployment mechanism to test swarms of small networked "satellites".<br>
<br>
Experiments flown on sounding rockets aren't necessarily only activated <br>
in space (unlike cubesats). They can be designed to run through the <br>
whole flight.<br>
<br>
The flight environment (acceleration, shock and vibe) of most sounding <br>
rockets is a bit harsher than an orbital launch - be prepared for that, <br>
or take advantage of it :-)<br>
<br>
--Jay, KA1PQK<br>
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