[Ground-station] Ground-Station Digest, Vol 28, Issue 12
Thomas Parry
yrrapt at gmail.com
Mon Jul 13 11:57:32 PDT 2020
For the telemetry and telecommand UHF links I would highly recommend the
CCSDS TM/TC protocol.
https://public.ccsds.org/Pubs/131x0b3e1.pdf
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.
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.
Often it's paired with GMSK modulation at 9600 bps.
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 (
https://github.com/daniestevez/gr-satellites) or countless other
implementations.
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.
Cheers,
Thomas
On Mon, 13 Jul 2020 at 19:44,
<ground-station-request at lists.openresearch.institute> wrote:
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> 1. Zoom Office Hours tonight 13 July 2020! (Michelle Thompson)
> 2. Re: Zoom Office Hours tonight 13 July 2020! (Michelle Thompson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 13 Jul 2020 09:58:42 -0700
> From: Michelle Thompson <mountain.michelle at gmail.com>
> To: Michelle Thompson via Ground-Station
> <ground-station at lists.openresearch.institute>
> Subject: [Ground-station] Zoom Office Hours tonight 13 July 2020!
> Message-ID:
> <
> CACvjz2Xb-AFdNkjjvo3wXFVznK3WkLNOwc78+WQByHHTspoEFw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Question and answer and work session tonight on Zoom.
>
> 1900 US Pacific until whenever we run out of questions!
>
> This is 1100 JST so hopefully Sumio and others can attend. We'll try this
> session on Monday evenings for a while, and interleave with San Diego
> Microwave Group. They meet once or twice a month at the same day/time.
>
> We'll have other meetings at different times, so if this doesn't work out
> for you (East Coast kind of late, for example, and way too early in Europe)
> then don't worry.
>
> Drop in and leave at your convenience.
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Office Hours 13 July 2020
> Monday, July 13?19:00 ? 21:00 US Pacific Time
>
> Join Zoom Meeting
> https://us02web.zoom.us/j/87630502013?pwd=NE5hbkI2V2MxR3p4akgyNWw4UVpFZz09
>
> Meeting ID: 876 3050 2013
> Password: 220310
> One tap mobile
> +16699009128,,87630502013#,,,,0#,,220310# US (San Jose)
> +13462487799,,87630502013#,,,,0#,,220310# US (Houston)
>
> Dial by your location
> +1 669 900 9128 US (San Jose)
> +1 346 248 7799 US (Houston)
> +1 253 215 8782 US (Tacoma)
> +1 312 626 6799 US (Chicago)
> +1 646 558 8656 US (New York)
> +1 301 715 8592 US (Germantown)
> Meeting ID: 876 3050 2013
> Password: 220310
> Find your local number: https://us02web.zoom.us/u/kdeV1cHBI7
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
> -Michelle W5NYV
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>
> Message: 2
> Date: Mon, 13 Jul 2020 10:43:18 -0700
> From: Michelle Thompson <mountain.michelle at gmail.com>
> To: Douglas Quagliana <dquagliana at gmail.com>, Michelle Thompson via
> Ground-Station <ground-station at lists.openresearch.institute>
> Subject: Re: [Ground-station] Zoom Office Hours tonight 13 July 2020!
> Message-ID:
> <
> CACvjz2U7Prx4X9d1zefM6r3dL6xoi1dhZpJjWS7VNTiYJYU9+A at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Douglas can't make the call and wants to talk about telemetry, so let's
> take it on!
>
> Attached is the current draft of the system architecture document for
> Gateway (and P4DX).
>
> Telemetry views start at the very bottom of page 17 (will fix that break).
>
> I think we should plan for telemetry being both a separate signal and also
> interleaved with the digital downlink.
>
> I don't know what things are going to be measured. There are assumptions in
> the document (temperature, voltage, current, power, channel assignments,
> operators active, metadata for operator activity, SNR).
>
> For a separate signal (Gateway has a 435MHz transceiver) we should talk
> about what that signal should look like.
>
> If we had to handle our own stationkeeping or propulsion, what would that
> require.
>
> -Michelle W5NYV
>
>
>
>
> On Mon, Jul 13, 2020 at 10:24 AM Douglas Quagliana <dquagliana at gmail.com>
> wrote:
>
> > Maybe this is the wrong place to ask. But here's a question for you or
> > anybody who knows:
> >
> > What details do we know about how the telemetry will be sent from Lunar
> > Gateway to the ground? Specifically, will it be a part of a multiplexed
> > stream, or will the telemetry be sent down as its own separate signal, or
> > both?
> >
> > Does anybody have any details about what "things" will be measured and
> > what values will be sent? Do we know any of the "things" that will
> > definitely be measured?
> >
> > Or... still way too early? I realize that the answers might still be
> > "Doug, we don't know yet".
> >
> > 73 and stay safe,
> > Douglas KA2UPW/5
> >
> >
> > On Mon, Jul 13, 2020 at 11:59 AM Michelle Thompson via Ground-Station
> > <ground-station at lists.openresearch.institute> wrote:
> >
> >> Question and answer and work session tonight on Zoom.
> >>
> >> 1900 US Pacific until whenever we run out of questions!
> >>
> >> This is 1100 JST so hopefully Sumio and others can attend. We'll try
> this
> >> session on Monday evenings for a while, and interleave with San Diego
> >> Microwave Group. They meet once or twice a month at the same day/time.
> >>
> >> We'll have other meetings at different times, so if this doesn't work
> out
> >> for you (East Coast kind of late, for example, and way too early in
> Europe)
> >> then don't worry.
> >>
> >> Drop in and leave at your convenience.
> >>
> >> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> >> Office Hours 13 July 2020
> >> Monday, July 13?19:00 ? 21:00 US Pacific Time
> >>
> >> Join Zoom Meeting
> >>
> https://us02web.zoom.us/j/87630502013?pwd=NE5hbkI2V2MxR3p4akgyNWw4UVpFZz09
> >>
> >> Meeting ID: 876 3050 2013
> >> Password: 220310
> >> One tap mobile
> >> +16699009128,,87630502013#,,,,0#,,220310# US (San Jose)
> >> +13462487799,,87630502013#,,,,0#,,220310# US (Houston)
> >>
> >> Dial by your location
> >> +1 669 900 9128 US (San Jose)
> >> +1 346 248 7799 US (Houston)
> >> +1 253 215 8782 US (Tacoma)
> >> +1 312 626 6799 US (Chicago)
> >> +1 646 558 8656 US (New York)
> >> +1 301 715 8592 US (Germantown)
> >> Meeting ID: 876 3050 2013
> >> Password: 220310
> >> Find your local number: https://us02web.zoom.us/u/kdeV1cHBI7
> >>
> >> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> >>
> >> -Michelle W5NYV
> >>
> >>
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