From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) (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 3EB603B29D for ; Fri, 12 May 2023 00:39:16 -0400 (EDT) Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-6434e263962so7062281b3a.2 for ; Thu, 11 May 2023 21:39:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ieee.org; s=google; t=1683866355; x=1686458355; h=references:to:cc:in-reply-to:date:subject:mime-version:message-id :from:from:to:cc:subject:date:message-id:reply-to; bh=VVc1K+BOs4tavxzCibLvKNFTwuLWr3sOzB5HC4JuFLE=; b=C3ICb4hhMM9b/X0u0XsBW9PkBlSQhvfBz1+G4Zyy5Zvxjxm/OCFbadBrV9T/MLa+rj LfbWJdqj9ee+TYvOG2JlTsR7ZQ+KZXOo3HeV0euxZ3+pqCp6lKlQObQO+2miQ2uxfr2O PQhJfRyPFjPDIMGLQJlzWNVdH5pXJXXGkkUKQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683866355; x=1686458355; h=references:to:cc:in-reply-to:date:subject:mime-version:message-id :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=VVc1K+BOs4tavxzCibLvKNFTwuLWr3sOzB5HC4JuFLE=; b=Qr1cHPNxhA6dX5osc8BKOhIBb1/n4hUBLphn9f4rcv41tEHvLbjhkitPlh3OKuptSq ITsZIKQMUibuhfg7rZpc//hsG5lPU4sML6a6cscmujSZpIrvFR/9/16dOO5Niczreija zDBdev95b/PGalLhUeaYvnGljXu+K93z1qhLDytrx0WeRdakV1RY1CYUTJLqy+XJH/Ca tDg4WKXZ4+hD9vQdj2uv+VilS1waPmortnPM14b8+HJAB1boiStpv3w1k0zq6BUEiTfN kZt/M0oM1ubZAoajH6cunYxfKCprRNBOIlyKOgyqjxtoMTQTUcP4F2di9VpfsUHovu4l DcCA== X-Gm-Message-State: AC+VfDwIprjzdzaVum7rZ5gcbhYdEdGRe2M8FDe2XzzhV3tKqzv2T3k5 c9MhUL3S8SAiXY236/x4qctrPQ== X-Google-Smtp-Source: ACHHUZ6qe4/SM7zY942ErHm5835v+IzKIlzS8nSpfESNIo29SOL7RXk+xnKJWdf3QBv4NxfEqpk8DA== X-Received: by 2002:a05:6a00:2d97:b0:636:f899:4696 with SMTP id fb23-20020a056a002d9700b00636f8994696mr31485819pfb.24.1683866355105; Thu, 11 May 2023 21:39:15 -0700 (PDT) Received: from smtpclient.apple (dhcp-72-253-196-65.hawaiiantel.net. [72.253.196.65]) by smtp.gmail.com with ESMTPSA id e11-20020a62ee0b000000b00642ea56f06dsm6102919pfi.26.2023.05.11.21.39.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 May 2023 21:39:14 -0700 (PDT) From: Eugene Y Chang Message-Id: Content-Type: multipart/signed; boundary="Apple-Mail=_9ACD12EB-11EE-46DB-8C30-CD81364AF8D8"; protocol="application/pgp-signature"; micalg=pgp-sha256 Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.120.41.1.3\)) Date: Thu, 11 May 2023 18:39:12 -1000 In-Reply-To: Cc: Eugene Chang , Oleg Kutkov , Sirapop Theeranantachai , Dave Taht via Starlink To: David Lang References: <75e8f43a-5ac2-6ddf-4fb6-da2f6366e7c8@olegkutkov.me> X-Mailer: Apple Mail (2.3696.120.41.1.3) 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: Fri, 12 May 2023 04:39:16 -0000 --Apple-Mail=_9ACD12EB-11EE-46DB-8C30-CD81364AF8D8 Content-Type: multipart/alternative; boundary="Apple-Mail=_7E34DEDE-9C06-46BF-8890-C5DE091AA70A" --Apple-Mail=_7E34DEDE-9C06-46BF-8890-C5DE091AA70A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 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: >=20 > On Thu, 11 May 2023, Eugene Y Chang via Starlink wrote: >=20 >> 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. >=20 > 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. >=20 > David Lang_______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink --Apple-Mail=_7E34DEDE-9C06-46BF-8890-C5DE091AA70A Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 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 <david@lang.hm> = 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

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