From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt1-x833.google.com (mail-qt1-x833.google.com [IPv6:2607:f8b0:4864:20::833]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 9D2A13B29E for ; Mon, 5 Jun 2023 15:04:01 -0400 (EDT) Received: by mail-qt1-x833.google.com with SMTP id d75a77b69052e-3f7a546efb1so40060931cf.2 for ; Mon, 05 Jun 2023 12:04:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1685991841; x=1688583841; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=ubfcG7U5byeKExy+qokdvb+TutO2ANfUXIG0aicv834=; b=nDMzqw2TOgls4QDUQkBTTK0Ej8rjKzzCBGa1A/oKonFHQ7YimjCMrt6L5oF/mBQl/O bUypSdWoY27RAS8J8g1qnxseXfv/t+NclPt5CXc8t7tjcqaEjWzOaB4aAknj5YTh+t8S sSLcVi6Re4lwaoYIkLcv8ziagwAfT1X6I63d+Ma9h4xmQthwNVI4NgNEPtoMga8ftjen lqep9/xtRd/KjWcYn/MQLS5MTCBkbWNg4MXbgRamcbTUgTx/LNq2MDNfIuK6OgxByWAy Q7iD9OFqADDdwmY3wwM+YMXTW/lofIDw58pBgfwqf1Y+Fkekj6tYMMDQwBH5KxFLxgIR mTAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685991841; x=1688583841; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=ubfcG7U5byeKExy+qokdvb+TutO2ANfUXIG0aicv834=; b=FQvO7jc/gUcOpfA3s/1cqoi/zVBg7xf2/W0n17J1gh+ReWeVnyx0n7Jx6aVRoKk4VT sxgKA141Pj72e8Y7YbsRyOJ2zwztNKzvGoBU2CJYUxS4yGC+sTSimc4oZoeShvzHPJHo ejrivu64U1mwTnRmj+6/D1ycGUQGFmi9GCzVGM4NVwcmdqDLt/e1ezY4ULeV0fhUFmT1 ZamlqFWcDm35kYpEzgWiJWkS5epWadE4kkPJWUd4Kf4G+QJ94ulgGV5ZPeqbjZcIbKQS 1vXCx9bncEwoToma6xwITsonREEwJAm/XVGDlLbJDtGI0UFC9t6+qxMqHAufp4eQy7vE zedA== X-Gm-Message-State: AC+VfDzgNaPmDr/3Ak5mvIwif+CpF9ohCNc1/VQE+ICdXM/3pInHBKDV OW2jM03Wt+eRpbwd9FlK70WDnk877p8R+wK6Pc8= X-Google-Smtp-Source: ACHHUZ5aengzsjc6+AwNCjl5PjOwPfOjiNdy6NF5dnV3DHmit9YyB0kKQktVBLRaITGPZ5ibRWI9F9txqMTimgRbqVU= X-Received: by 2002:a05:622a:4d3:b0:3f4:ef5f:b5c7 with SMTP id q19-20020a05622a04d300b003f4ef5fb5c7mr8455215qtx.0.1685991840864; Mon, 05 Jun 2023 12:04:00 -0700 (PDT) MIME-Version: 1.0 References: <75e8f43a-5ac2-6ddf-4fb6-da2f6366e7c8@olegkutkov.me> In-Reply-To: From: Sirapop Theeranantachai Date: Mon, 5 Jun 2023 12:03:49 -0700 Message-ID: To: Eugene Y Chang Cc: David Lang , Oleg Kutkov , Dave Taht via Starlink Content-Type: multipart/alternative; boundary="000000000000c4dd3d05fd6690eb" Subject: Re: [Starlink] Quick questions about Starlink user terminal X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Jun 2023 19:04:01 -0000 --000000000000c4dd3d05fd6690eb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, I have a few follow-up questions We're simulating the Starlink on a + grid topology on the same inclination angle. 4 ISLs are static (but delay chages). Two of them connect to other sats within the same orbital plane, and the other connect to the adjacent plane (+1 or - 1) . We know that if the dish is connected to one satellite at the a time, the latency may not be as great when the orbital planes that the two nodes are connected to are far apart. It can double the RTT if the orbital planes are on thr opposite side to each other. If we have two GSL channels, one of them can connect to the satellite that moves north-bound, and the other that moves southbound. This assumption can provide a significant boost on latency. Oleg mentioned that HP hardware can do that? Questions are: Do you think is this the reason why HP has that kind of antenna? How did you get that information about HP just in case I need a reference. Thank you so much! Mark On Thu, May 11, 2023, 9:39 PM Eugene Y Chang wrote: > The comment (speculation?) about laser communications between satellites > in different orbital planes suggest challenges in tracking. I am really > curious about the mechanics of tracking and laser pointing. > > Gene > ---------------------------------------------- > Eugene Chang > IEEE Communications Society & Signal Processing Society, > Hawaii Chapter Chair > IEEE Hawaii Section, Industry Engagement Coordinator > IEEE Life Member Affinity Group Hawaii Chair > IEEE Senior Life Member > eugene.chang@ieee.org > m 781-799-0233 (in Honolulu) > > > > On May 11, 2023, at 6:28 PM, David Lang wrote: > > On Thu, 11 May 2023, Eugene Y Chang via Starlink wrote: > > What do we know about Starlink=E2=80=99s use of laser links for > satellite-to-satellite communications? I am most curious about the > challenges of pointing the laser at a moving target. > > > We know they do it, we see starlink coverage in areas that could not be > served without such communication. But we have no details of how they do = it > or the problems they solved in creating the system. > > David Lang_______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink > > > --000000000000c4dd3d05fd6690eb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi, I have a few follow-up questions
We're simulating the Starlink on a + grid topo= logy on the same inclination angle.=C2=A0

=
4 ISLs are static (but delay chages). Two of them connect= to other sats within the same orbital plane, and the other connect to the = adjacent plane (+1 or - 1) .

W= e know that if the dish is connected to one satellite at the a time, the la= tency may not be as great when the orbital planes that the two nodes are co= nnected to are far apart. It can double the RTT if the orbital planes are o= n thr opposite side to each other.=C2=A0

<= div dir=3D"auto">
If we have two GSL channels, o= ne of them can connect to the satellite that moves=C2=A0 north-bound, and t= he other that moves southbound. This assumption can provide a significant b= oost on latency.=C2=A0

Oleg mentioned that HP hardware can do that?
Ques= tions are:
Do you think is this the reason why HP ha= s that kind of antenna?
How did you get that informa= tion about HP just in case I need a reference.=C2=A0

Thank you so much!
Mark=

On Thu, May 11, 2023, 9:39 PM Eugene Y Chang <eugene.chan= g@ieee.org> wrote:
The comment (specu= lation?) about laser communications between satellites in different orbital= planes suggest challenges in tracking. I am really curious about the mecha= nics of tracking and laser pointing.

Gene
----------------------------------------------Eugene Chang
IEEE Communications Society & Signal Processin= g Society, =C2=A0 =C2=A0
=C2=A0 =C2=A0 Hawaii Chapter Chair
IE= EE Hawaii Section, Industry Engagement Coordinator
IEEE Life Memb= er Affinity Group Hawaii Chair
IEEE Senior Life Member
= eugene.chang@ieee.org
m 781-799-0233 (in Honolulu)


=

On May 11, 2023, at 6:28 PM, David = Lang <david@lang.hm> wrote:

On Thu, 11 M= ay 2023, Eugene Y Chang via Starlink wrote:

What do we know about Starlink=E2=80=99s use of laser links for satellite= -to-satellite communications? I am most curious about the challenges of poi= nting the laser at a moving target.

We know they do it,= we see starlink coverage in areas that could not be served without such co= mmunication. But we have no details of how they do it or the problems they = solved in creating the system.

David Lang___________________________= ____________________
Starlink mailing list
Sta= rlink@lists.bufferbloat.net
https:/= /lists.bufferbloat.net/listinfo/starlink

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