<div dir="ltr"><div>For the telemetry and telecommand UHF links I would highly recommend the CCSDS TM/TC protocol.</div><div><a href="https://public.ccsds.org/Pubs/131x0b3e1.pdf">https://public.ccsds.org/Pubs/131x0b3e1.pdf</a><br></div><div><br></div><div>The most common implementation I've seen is concatenated Reed Solomon (223/255) and Convolutional Coding (1/2 rate) on the downlink and BCH on uplink.</div><div>The coding's old school enough to be almost trivial to implement on low-power processors but gives a good bang for your buck in link resilience.</div><div>Often it's paired with GMSK modulation at 9600 bps.</div><div><br></div><div>The main reason I suggest this is it's the configuration that is about as standard as I've seen. You can talk to NASA groundstations with a few settings applied or you can more likely use gr-satellites (<a href="https://github.com/daniestevez/gr-satellites">https://github.com/daniestevez/gr-satellites</a>) or countless other implementations.</div><div><br></div><div>It also fits right into a lot of work done over at the LibreCube community where they've been implementing the high level protocols in the stack for file transfer and general operations tasks.</div><div><br></div><div>Cheers,</div><div>Thomas</div><div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 13 Jul 2020 at 19:44, <ground-station-request@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">Send Ground-Station mailing list submissions to<br>
ground-station@lists.openresearch.institute<br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
<a href="http://lists.openresearch.institute/listinfo.cgi/ground-station-openresearch.institute" rel="noreferrer" target="_blank">http://lists.openresearch.institute/listinfo.cgi/ground-station-openresearch.institute</a><br>
<br>
or, via email, send a message with subject or body 'help' to<br>
ground-station-request@lists.openresearch.institute<br>
<br>
You can reach the person managing the list at<br>
ground-station-owner@lists.openresearch.institute<br>
<br>
When replying, please edit your Subject line so it is more specific<br>
than "Re: Contents of Ground-Station digest..."<br>
<br>
<br>
Today's Topics:<br>
<br>
1. Zoom Office Hours tonight 13 July 2020! (Michelle Thompson)<br>
2. Re: Zoom Office Hours tonight 13 July 2020! (Michelle Thompson)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Mon, 13 Jul 2020 09:58:42 -0700<br>
From: Michelle Thompson <<a href="mailto:mountain.michelle@gmail.com" target="_blank">mountain.michelle@gmail.com</a>><br>
To: Michelle Thompson via Ground-Station<br>
<ground-station@lists.openresearch.institute><br>
Subject: [Ground-station] Zoom Office Hours tonight 13 July 2020!<br>
Message-ID:<br>
<<a href="mailto:CACvjz2Xb-AFdNkjjvo3wXFVznK3WkLNOwc78%2BWQByHHTspoEFw@mail.gmail.com" target="_blank">CACvjz2Xb-AFdNkjjvo3wXFVznK3WkLNOwc78+WQByHHTspoEFw@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Question and answer and work session tonight on Zoom.<br>
<br>
1900 US Pacific until whenever we run out of questions!<br>
<br>
This is 1100 JST so hopefully Sumio and others can attend. We'll try this<br>
session on Monday evenings for a while, and interleave with San Diego<br>
Microwave Group. They meet once or twice a month at the same day/time.<br>
<br>
We'll have other meetings at different times, so if this doesn't work out<br>
for you (East Coast kind of late, for example, and way too early in Europe)<br>
then don't worry.<br>
<br>
Drop in and leave at your convenience.<br>
<br>
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-<br>
Office Hours 13 July 2020<br>
Monday, July 13?19:00 ? 21:00 US Pacific Time<br>
<br>
Join Zoom Meeting<br>
<a href="https://us02web.zoom.us/j/87630502013?pwd=NE5hbkI2V2MxR3p4akgyNWw4UVpFZz09" rel="noreferrer" target="_blank">https://us02web.zoom.us/j/87630502013?pwd=NE5hbkI2V2MxR3p4akgyNWw4UVpFZz09</a><br>
<br>
Meeting ID: 876 3050 2013<br>
Password: 220310<br>
One tap mobile<br>
+16699009128,,87630502013#,,,,0#,,220310# US (San Jose)<br>
+13462487799,,87630502013#,,,,0#,,220310# US (Houston)<br>
<br>
Dial by your location<br>
+1 669 900 9128 US (San Jose)<br>
+1 346 248 7799 US (Houston)<br>
+1 253 215 8782 US (Tacoma)<br>
+1 312 626 6799 US (Chicago)<br>
+1 646 558 8656 US (New York)<br>
+1 301 715 8592 US (Germantown)<br>
Meeting ID: 876 3050 2013<br>
Password: 220310<br>
Find your local number: <a href="https://us02web.zoom.us/u/kdeV1cHBI7" rel="noreferrer" target="_blank">https://us02web.zoom.us/u/kdeV1cHBI7</a><br>
<br>
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-<br>
<br>
-Michelle W5NYV<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://lists.openresearch.institute/pipermail/ground-station-openresearch.institute/attachments/20200713/c7add1dc/attachment-0001.html" rel="noreferrer" target="_blank">http://lists.openresearch.institute/pipermail/ground-station-openresearch.institute/attachments/20200713/c7add1dc/attachment-0001.html</a>><br>
<br>
------------------------------<br>
<br>
Message: 2<br>
Date: Mon, 13 Jul 2020 10:43:18 -0700<br>
From: Michelle Thompson <<a href="mailto:mountain.michelle@gmail.com" target="_blank">mountain.michelle@gmail.com</a>><br>
To: Douglas Quagliana <<a href="mailto:dquagliana@gmail.com" target="_blank">dquagliana@gmail.com</a>>, Michelle Thompson via<br>
Ground-Station <ground-station@lists.openresearch.institute><br>
Subject: Re: [Ground-station] Zoom Office Hours tonight 13 July 2020!<br>
Message-ID:<br>
<<a href="mailto:CACvjz2U7Prx4X9d1zefM6r3dL6xoi1dhZpJjWS7VNTiYJYU9%2BA@mail.gmail.com" target="_blank">CACvjz2U7Prx4X9d1zefM6r3dL6xoi1dhZpJjWS7VNTiYJYU9+A@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Douglas can't make the call and wants to talk about telemetry, so let's<br>
take it on!<br>
<br>
Attached is the current draft of the system architecture document for<br>
Gateway (and P4DX).<br>
<br>
Telemetry views start at the very bottom of page 17 (will fix that break).<br>
<br>
I think we should plan for telemetry being both a separate signal and also<br>
interleaved with the digital downlink.<br>
<br>
I don't know what things are going to be measured. There are assumptions in<br>
the document (temperature, voltage, current, power, channel assignments,<br>
operators active, metadata for operator activity, SNR).<br>
<br>
For a separate signal (Gateway has a 435MHz transceiver) we should talk<br>
about what that signal should look like.<br>
<br>
If we had to handle our own stationkeeping or propulsion, what would that<br>
require.<br>
<br>
-Michelle W5NYV<br>
<br>
<br>
<br>
<br>
On Mon, Jul 13, 2020 at 10:24 AM Douglas Quagliana <<a href="mailto:dquagliana@gmail.com" target="_blank">dquagliana@gmail.com</a>><br>
wrote:<br>
<br>
> Maybe this is the wrong place to ask. But here's a question for you or<br>
> anybody who knows:<br>
><br>
> What details do we know about how the telemetry will be sent from Lunar<br>
> Gateway to the ground? Specifically, will it be a part of a multiplexed<br>
> stream, or will the telemetry be sent down as its own separate signal, or<br>
> both?<br>
><br>
> Does anybody have any details about what "things" will be measured and<br>
> what values will be sent? Do we know any of the "things" that will<br>
> definitely be measured?<br>
><br>
> Or... still way too early? I realize that the answers might still be<br>
> "Doug, we don't know yet".<br>
><br>
> 73 and stay safe,<br>
> Douglas KA2UPW/5<br>
><br>
><br>
> On Mon, Jul 13, 2020 at 11:59 AM Michelle Thompson via Ground-Station<br>
> <ground-station@lists.openresearch.institute> wrote:<br>
><br>
>> Question and answer and work session tonight on Zoom.<br>
>><br>
>> 1900 US Pacific until whenever we run out of questions!<br>
>><br>
>> This is 1100 JST so hopefully Sumio and others can attend. We'll try this<br>
>> session on Monday evenings for a while, and interleave with San Diego<br>
>> Microwave Group. They meet once or twice a month at the same day/time.<br>
>><br>
>> We'll have other meetings at different times, so if this doesn't work out<br>
>> for you (East Coast kind of late, for example, and way too early in Europe)<br>
>> then don't worry.<br>
>><br>
>> Drop in and leave at your convenience.<br>
>><br>
>> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-<br>
>> Office Hours 13 July 2020<br>
>> Monday, July 13?19:00 ? 21:00 US Pacific Time<br>
>><br>
>> Join Zoom Meeting<br>
>> <a href="https://us02web.zoom.us/j/87630502013?pwd=NE5hbkI2V2MxR3p4akgyNWw4UVpFZz09" rel="noreferrer" target="_blank">https://us02web.zoom.us/j/87630502013?pwd=NE5hbkI2V2MxR3p4akgyNWw4UVpFZz09</a><br>
>><br>
>> Meeting ID: 876 3050 2013<br>
>> Password: 220310<br>
>> One tap mobile<br>
>> +16699009128,,87630502013#,,,,0#,,220310# US (San Jose)<br>
>> +13462487799,,87630502013#,,,,0#,,220310# US (Houston)<br>
>><br>
>> Dial by your location<br>
>> +1 669 900 9128 US (San Jose)<br>
>> +1 346 248 7799 US (Houston)<br>
>> +1 253 215 8782 US (Tacoma)<br>
>> +1 312 626 6799 US (Chicago)<br>
>> +1 646 558 8656 US (New York)<br>
>> +1 301 715 8592 US (Germantown)<br>
>> Meeting ID: 876 3050 2013<br>
>> Password: 220310<br>
>> Find your local number: <a href="https://us02web.zoom.us/u/kdeV1cHBI7" rel="noreferrer" target="_blank">https://us02web.zoom.us/u/kdeV1cHBI7</a><br>
>><br>
>> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-<br>
>><br>
>> -Michelle W5NYV<br>
>><br>
>><br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://lists.openresearch.institute/pipermail/ground-station-openresearch.institute/attachments/20200713/059989a0/attachment.html" rel="noreferrer" target="_blank">http://lists.openresearch.institute/pipermail/ground-station-openresearch.institute/attachments/20200713/059989a0/attachment.html</a>><br>
-------------- next part --------------<br>
A non-text attachment was scrubbed...<br>
Name: 20200617-AREx-System-Architecture.pdf<br>
Type: application/pdf<br>
Size: 1091315 bytes<br>
Desc: not available<br>
URL: <<a href="http://lists.openresearch.institute/pipermail/ground-station-openresearch.institute/attachments/20200713/059989a0/attachment.pdf" rel="noreferrer" target="_blank">http://lists.openresearch.institute/pipermail/ground-station-openresearch.institute/attachments/20200713/059989a0/attachment.pdf</a>><br>
<br>
------------------------------<br>
<br>
Subject: Digest Footer<br>
<br>
_______________________________________________<br>
Ground-Station mailing list<br>
Ground-Station@lists.openresearch.institute<br>
<a href="http://lists.openresearch.institute/listinfo.cgi/ground-station-openresearch.institute" rel="noreferrer" target="_blank">http://lists.openresearch.institute/listinfo.cgi/ground-station-openresearch.institute</a><br>
<br>
<br>
------------------------------<br>
<br>
End of Ground-Station Digest, Vol 28, Issue 12<br>
**********************************************<br>
</blockquote></div></div>