From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oo1-xc35.google.com (mail-oo1-xc35.google.com [IPv6:2607:f8b0:4864:20::c35]) (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 366B23CB37 for ; Fri, 23 Jun 2023 12:56:15 -0400 (EDT) Received: by mail-oo1-xc35.google.com with SMTP id 006d021491bc7-55e0706af99so573203eaf.1 for ; Fri, 23 Jun 2023 09:56:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687539374; x=1690131374; h=content-transfer-encoding:to:subject:message-id:date:from :references:in-reply-to:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=IyNhmN8EqGd19qhRyBwii7ZM48KLLWaacqyD+0n4AqE=; b=AwjJuW1j10lJwAZX/hhvM+gKwkN25E7JcOD67KGiA3Jv3RKpv3w7utNjSwPXoQCRTU cUHOVRPa2q1bieZOnw8IOj97HZkSrtODJdRbJF2bfoyYraWVarowhHKqLRetP68+gmzX Q0eV/bY5Dxon/hHZMqfqOcx1uAkFNfKEP5xBJs/ejFJr1YypMvw8aZSr8RrRFxGS8pwf 8SnBHqJ15e7zn7pxi4tum65o/sFjrdvzU/3mlKSRmgIQm+1oaD2B2h8KSruXKWzUeF8I W3HkNCWPN8ZXsEleYbiLCVHZQcqprefcaNOPjo5diZR981S1SZb/hQcrpd2tmdQgEGQ+ OJZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687539374; x=1690131374; h=content-transfer-encoding:to:subject:message-id:date:from :references:in-reply-to:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=IyNhmN8EqGd19qhRyBwii7ZM48KLLWaacqyD+0n4AqE=; b=FK+PYVmTc8jdqnKYxqdLnom5ewvursK/iraghJUvtqONsKhYXj2tTRgJKfe20SNclF 05ND5YAnr4BXuOSgFdeSuKiWoG1vKo2zZ/WjVcOvGK8mS/2cUyw+iLJo8IoVm3GHUlMh ZWVOtwG0RwjWiuQIfIdjRHuDXIio8dzsispdu98yaa5j8j2PSzFlS1c16Xz7qEcU3zva y6eAUTdqCT8qyMxX2bUfKmBL83Gk/9EbB/2HG1CIZggPvlaIoH1Cf5assN+5x1gfqgBA iJVnVFKj6OTYIUumzlJevBTGmzxM45l2zlWtvEcCGyyzQUFO9tuOKxGPHGgEJEToDtL8 waOw== X-Gm-Message-State: AC+VfDwFjn2tvOAOZH5nXzTDovAbLYK2XOitmmp8t7tmWeh0un+HGzmJ itpR4UruHn1ZxWgbnijm2inuhKtz/hX73PKdhDCSJVe9+gw= X-Google-Smtp-Source: ACHHUZ5Xg+mf3eJ+x7Y6nEQNTWwwBfKcMgK+kzRRbs6Z4JAGww18XSPsCh/5voCUxEgieRrzLzvQJo80OGyzU/NrQyE= X-Received: by 2002:a05:6820:151a:b0:55a:f44b:43cd with SMTP id ay26-20020a056820151a00b0055af44b43cdmr13637778oob.7.1687539374250; Fri, 23 Jun 2023 09:56:14 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a05:6359:6f9a:b0:130:e6dd:711c with HTTP; Fri, 23 Jun 2023 09:56:13 -0700 (PDT) In-Reply-To: <0401A097-59CD-4A30-B853-04D1F3945DA0@olegkutkov.me> References: <0401A097-59CD-4A30-B853-04D1F3945DA0@olegkutkov.me> From: =?UTF-8?Q?David_Fern=C3=A1ndez?= Date: Fri, 23 Jun 2023 18:56:13 +0200 Message-ID: To: starlink@lists.bufferbloat.net Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Starlink] Signal Structure of the Starlink Ku-Band Downlink 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, 23 Jun 2023 16:56:15 -0000 This may be a reaction, but not from Elon, of course: https://www.esa.int/Applications/Navigation/Industry_invited_to_bid_for_low= -Earth_orbit_satnav_demo 2023-06-23 18:50 GMT+02:00, contact@olegkutkov.me : > > No reaction from SpaceX or Elon > >> On 23 Jun 2023, at 19:15, Hesham ElBakoury via Starlink >> wrote: >> >> =EF=BB=BF >> What was Elon Musk reaction to this research? >> >> Hesham >> >> On Fri, Jun 23, 2023, 9:12 AM David Fern=C3=A1ndez via Starlink >> wrote: >>> >>> I think that paper has already been discussed in this list. It >>> appeared in the news a while ago: >>> https://www.theregister.com/2022/10/24/starlink_signal_decoded_for_use >>> >>> Regards, >>> >>> David >>> >>> > Date: Fri, 23 Jun 2023 06:17:08 -0700 >>> > From: Joe Hamelin >>> > To: Hesham ElBakoury >>> > Cc: starlink@lists.bufferbloat.net >>> > Subject: Re: [Starlink] Signal Structure of the Starlink Ku-Band >>> > Downlink >>> > Message-ID: >>> > >>> > >>> > Content-Type: text/plain; charset=3D"utf-8" >>> > >>> > Most interesting: >>> > >>> > " VIII. CONCLUSIONS We have developed and applied a blind signal >>> > identification technique to uncover the frequency- and time-domain >>> > structure of the Starlink Ku-band downlink signal. We further >>> > identified >>> > four synchronization sequences that can be used to *passively exploit= * >>> > Starlink signals for pseudorange-based positioning, navigation, and >>> > timing >>> > (PNT), and explicitly evaluated two of these. The results in this pap= er >>> > illuminate the *path to use of Starlink signals as a backup to >>> > traditional >>> > GNSS* for PNT." >>> > >>> > On Fri, Jun 23, 2023 at 6:09=E2=80=AFAM Joe Hamelin wrote: >>> > >>> >> >>> >> https://radionavlab.ae.utexas.edu/wp-content/uploads/2023/01/starlin= k_structure.pdf >>> >> >>> >> Here's the PDF. >>> >> >>> >> On Fri, Jun 23, 2023 at 2:55=E2=80=AFAM Hesham ElBakoury via Starlin= k < >>> >> starlink@lists.bufferbloat.net> wrote: >>> >> >>> >>> Has anyone looked at this paper (Signal Structure of the Starlink >>> >>> Ku-Band Downlink) by Todd E. Humphreys ? This paper will be publish= ed >>> >>> in >>> >>> IEEE Transactions on Aerospace and Electronic Systems. Are there >>> >>> other >>> >>> research efforts which try to do the same? >>> >>> >>> >>> Thanks >>> >>> >>> >>> Hesham >>> >>> >>> >>> >>> >>> _______________________________________________ >>> >>> Starlink mailing list >>> >>> Starlink@lists.bufferbloat.net >>> >>> https://lists.bufferbloat.net/listinfo/starlink >>> >>> >>> >> >>> >> >>> >> -- >>> >> -- >>> >> Joe Hamelin, W7COM, Tulalip, WA, 360-474-7474 >>> _______________________________________________ >>> Starlink mailing list >>> Starlink@lists.bufferbloat.net >>> https://lists.bufferbloat.net/listinfo/starlink >> >> _______________________________________________ >> Starlink mailing list >> Starlink@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/starlink >