[Starlink] Starlink filings for D-Band via Tonga

[Alexandre Petrescu]

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.petrescu at gmail.com>
>> To: starlink at lists.bufferbloat.net
>> Subject: Re: [Starlink] Starlink filings for D-Band via Tonga
>> Message-ID: <805d52ce-b517-49b9-a053-8306cd20b8aa at 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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