Hi, David
Sorry, I've mistaken twitter for reddit.
The link is reddit. It is
https://www.reddit.com/r/spacex/comments/175ttvz/spacex_files_29988satellite_wband_network_using/
The person is 'spacerfirstclass' (_if_ it is a person, I dont know).
Referring to the ITU orbit filing he says (emphasis his):
This is exactly the same as Starlink Gen2 orbits filed with FCC, so *I
don't think this is a new constellation, this is just SpaceX adding G
band gateway connection to the existing Gen2 constellation*, and for
some reason they don't want to go through FCC to do this.
Alex
Le 16/11/2023 à 18:29, David Fernández via Starlink a écrit :
Hi Alex,
"A person on twitter seems to be saying this filing is precisely the
filing that spacex did at FCC"
Would you mind linking to that tweet, if it is public?
Thank you.
Regards,
David
Date: Thu, 16 Nov 2023 14:27:03 +0100
From: Alexandre Petrescu <alexandre.petre...@gmail.com>
To: starlink@lists.bufferbloat.net
Subject: Re: [Starlink] Starlink filings for D-Band via Tonga
Message-ID: <805d52ce-b517-49b9-a053-8306cd20b...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Towards clarification,
The .mdb file of the ITU filing can be read with Excel (tab Data ->
leftmost button 'Access'). The .mdb is on the web page of the ITU
filing, at the bottom of the page.
https://www.itu.int/ITU-R/space/asreceived/Publication/DisplayPublication/53068
It might be that this 'ESIAFI II' is just a name because of some reason.
There are some interesting dates like '06/03/2023', '13/03/2023' and
'20/03/2023' and '6/10/2023'.
There is much data about orbits, powers, beams that I dont know how to
interpret. I would need the precise description of the database format,
but I dont know where to get it from.
The frequencies are listed, as I interpret these fields: 123 GHz - 130
GHz centered on 126.5 GHz, 158.5-164 c 161.25 and 167-174.5 c 170.75.
About D-band: I am not sure what is precisely a 'D band' and I think
that discussion about bands is very complicated. I know there is
wikipedia page about it, yes.
A person on twitter seems to be saying this filing is precisely the
filing that spacex did at FCC; but comparing the numbers shows some
differences: total sats per plane differ at some altitudes like at 525km
altitude: ITU says 3600 sats whereas FCC says 3360 sats. There can be
speculations as to why they differ as there can be errors of various
people including myself.
The person on twitter tells that ITU filing is in this table, but I dont
know how he generated it. Not sure whether he made some syntax error.
Altitude (km) Inclination (degrees) Satellites per Plane Planes
Total Satellites
340 53 110 48 5280
345 46 110 48 5280
350 38 110 48 5280
360 96.9 120 30 3600
525 53 120 28 3600 [nota by me: FCC says 3360 and not 3600,
see
table below]
530 43 120 28 3600
535 33 120 28 3600
604 148 12 12 144
614 115.7 18 18 324
I found this earlier FCC document has this table at this URL
https://docs.fcc.gov/public/attachments/FCC-22-91A1.pdf (not sure
whether it is the most authoritative, but at least the mathematics
28*120 at altitude 525 does make sense to be 3360).
Altitude (km) Inclination (degrees) Orbital Planes sats/plane Total sats
340 53 48 110 5280
345 46 48 110 5280
350 38 48 110 5280
360 96.9 30 120 3600
525 53 28 120 3360 [nota by me:
28*120 == 3360 indeed]
530 43 28 120 3360
535 33 28 120 3360
604 148 12 12 144
614 115.7 18 18 324
Alex
Le 16/11/2023 à 10:30, Alexandre Petrescu via Starlink a écrit :
Le 15/11/2023 à 16:48, David Fernández via Starlink a écrit :
I have got news about the recent filing by Starlink for the use of
frequencies in D-band:
https://www.itu.int/ITU-R/space/asreceived/Publication/DisplayPublication/53068
This has been done via Tonga, not the USA, and is for both, uplink and
downlink frequencies, although only downlink seems to be allocated now
for satellite use.
Thanks for the pointer.
It is the first time I hear about this 'ESIAFI II' constellation. I
understand it is a different thing than the starlink existing
constellation.
It adds to the list of plans of LEO Internet constellations (starlink,
kuiper, oneweb etc.)
Alex
Regards,
David
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