From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lj1-x235.google.com (mail-lj1-x235.google.com [IPv6:2a00:1450:4864:20::235]) (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 D3A5A3B2A4 for ; Tue, 30 Apr 2024 04:47:16 -0400 (EDT) Received: by mail-lj1-x235.google.com with SMTP id 38308e7fff4ca-2db13ca0363so86385401fa.3 for ; Tue, 30 Apr 2024 01:47:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1714466835; x=1715071635; darn=lists.bufferbloat.net; h=to:subject:message-id:date:from:mime-version:from:to:cc:subject :date:message-id:reply-to; bh=jTDqq+a7WFSGaPAvyWOcCws2yYbpLp/diOhvaJmW0Vc=; b=hVo4QRgq9x0i8ZGJRNFfM+2SX4JMIrG4i8p3QIu6boy6OhpA7GGFiY6RXR+BnX9SPO /0FggQrAkJ87MRo4K9BpI2zROodbJREnG0+i47mliC7YBBxreWkEwPwr+TrJ0+QG3okb ZANN75ggr4a5oNrYBLQYkedFsS1jlBalnvpWqQ633fT9q1BZQ84Lopow6lU0smq2mIbv bVPvUGR7kh0A0IwQMLgk65YWEK1J4JbHYI1lwAXOG0066PZYZszea9Cn9/1D0KOR1raL KiV8ZYHsdyeVjINhjRr54B3N6uxeda7jx+1ennCQN8JurcitVA5u3AhRUxEj2bEvTD/X s0KQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1714466835; x=1715071635; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=jTDqq+a7WFSGaPAvyWOcCws2yYbpLp/diOhvaJmW0Vc=; b=qmSr9PawMQlCyHa3RSMd0j8CTLFBjuGep3e5Jz1gpvowQWvONCN0vqI24WTIZjyAl9 +a7DC+dR1/60fU9SzL2s5KxQEB3F3qg6UqJu39n1EcKZOnYfpRMKXyiD9h96e55e/+m2 cl6DI2gQ8vaPBaElfSVeef/smVH1cVF+M0D74L8MASoAyI4f4v/vCwUa/O8JDEsI3UcU xLFHIeE/tLYx7gsyBppIgHuOSpC9yknq8X2MjYDE4EWVZUI4JZNNF3HcCZvsDwHWTcRc iTRcbRPgmsyER3Zu3fTRWQahGzAQb4bD6TOY/l5/3xqUJtRi2dFwlKg7Z1yhVoAsKyI8 TWGg== X-Gm-Message-State: AOJu0YyDsx4zOS3vnfQjw3akZowwZHewpddUTRAgpSPsPGa2wHTJnKyk SESBYj2ZSvWqCemi5tPMcX0EqyNqoC4WR0VeNZXuzrT0L8BITPTZ0JQ/E9i3ATT2IDpDWT6tJSl MDFMy0rgFCmQcQisIi2oBjxM5Q3RABmaU41NDtA== X-Google-Smtp-Source: AGHT+IEk2AigTW7+EexaaJaKiseU10Yk8DQ4BAeEquC3S0y2F6grJ9y4Xe5zs7Q9rsgQAq+ebuP+AeJsEZfgFFWsWBE= X-Received: by 2002:a2e:730c:0:b0:2d8:5af9:90c5 with SMTP id o12-20020a2e730c000000b002d85af990c5mr10455592ljc.39.1714466834642; Tue, 30 Apr 2024 01:47:14 -0700 (PDT) MIME-Version: 1.0 From: =?UTF-8?Q?David_Fern=C3=A1ndez?= Date: Tue, 30 Apr 2024 10:46:38 +0200 Message-ID: To: starlink Content-Type: multipart/alternative; boundary="000000000000a8a54706174c6ade" Subject: Re: [Starlink] Time Synchronization in Satellite Networks 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: Tue, 30 Apr 2024 08:47:17 -0000 --000000000000a8a54706174c6ade Content-Type: text/plain; charset="UTF-8" Dear Hesham, May I ask for what reason do you need the satellites to be synchronized in time? What application is requiring this? Earth observation? Then, go for GNSS-based time synchronization, as done by EO satellites in LEO: https://navi.ion.org/content/69/3/navi.531 "GNSS signals could even be used for reliable navigation in lunar orbit", so also for time synchronization: https://www.nasa.gov/missions/tech-demonstration/nasa-navigation-tech-shows-timing-really-is-everything It seems that as long as your device can have a GNSS receiver, that's the best way to keep it time-synchronized. Is there anything preventing the use of GNSS on your intended application? https://lists.bufferbloat.net/pipermail/starlink/2024-March/002605.html Regards, David --000000000000a8a54706174c6ade Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dear Hesham,

May I ask for w= hat reason do you need the satellites to be synchronized in time? What appl= ication is requiring this? Earth observation? Then, go for GNSS-based time = synchronization, as done by EO satellites in LEO: https://navi.ion.org/content/69/3/navi.531

<= div>
It seems that as long as your device can have a GNSS rec= eiver, that's the best way to keep it time-synchronized. Is there anyth= ing preventing the use of GNSS on your intended application?
=

Regards,

David
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