From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oa1-x32.google.com (mail-oa1-x32.google.com [IPv6:2001:4860:4864:20::32]) (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 75FB03CB37 for ; Fri, 23 Jun 2023 12:12:43 -0400 (EDT) Received: by mail-oa1-x32.google.com with SMTP id 586e51a60fabf-1a997531cceso645439fac.3 for ; Fri, 23 Jun 2023 09:12:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687536762; x=1690128762; h=content-transfer-encoding:to:subject:message-id:date:from :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=A33wNUzFRcsqy75CE7aJmbKZ6T3YFUq1dnrMPB2Qugw=; b=RfV4ev0q7hFKttw3sBgnca+voP7WuSDuAObwSPQGhzwoITRf1ATfiTZ++oCQo3zQlv v4NwRAJgBxkPFotcZpUEVP479Wd0XKpbnr/t2qDYShS4nxetHZDnSFQe0r65P930hE/i geedcadUf1CeleAE1Q3LMnO+g8+Wt1Dz4TVb8K4LpmQRGJ4w7Ga6sTk2PcD1xQpgVSum 8TmZae0h3FqPBTi8ZYUeHn4cBYqHyhiN6i48D4efLSySxdaMWtKOAkdP41tSv3W02Ocu YOcPXfHXaZqq63R50DxXN8SB8smeAw/le5KvkCmXfEk1CRH+ZBbGDFiN4eTWUMKc8fqV sW9Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687536762; x=1690128762; h=content-transfer-encoding:to:subject:message-id:date:from :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=A33wNUzFRcsqy75CE7aJmbKZ6T3YFUq1dnrMPB2Qugw=; b=aiTw//WmZdIl3o9PPaJ04xOYSTlcJBlK19YvOqAFn4NTdtc7SXlQHINq7hD4PmyYN7 WT1f89tNFiF16dWWmPS0Z6ZmyTuX1TGNK3ZsMa4eIV3Ej76w6HRCmK2YtW8bb2IHBFes xA6qsgZHDmUT/jzvrAzUk/LHJi6aAFDIOhDKpdw/rwgXXkolGrzCNr/LemUqZ2b16bZK DS+hkNHnRsqK42db52qY3sLwLCHoEL7n/kOVRb9uiP/reOjtut+6AHIX/yTYt3P+AiWG carCIJDRNilMKK/TkuvFy7exXSY1ciiLlaupbbIzliD8wrhBtMkbqdnrfvyHZbFzZ7Uj 832A== X-Gm-Message-State: AC+VfDxs0jEVdeq5bEZ9S0luyEWf1EiU0EJqldqTSill4KslFouTwKoj fSQa9cvwCCgBv+TQpIczVueTn2hay19I7nVPD+HeFv85Hqo= X-Google-Smtp-Source: ACHHUZ54owKjFIbyFTxaQsptEJ0Ponl0VlTaH1tv+gDuNsm3a6tMmXHWnqMIaguvTYI5tEcnOwhrIlRgKiT8Eg6F5+4= X-Received: by 2002:a05:6870:7729:b0:1a2:a7bd:4a4a with SMTP id dw41-20020a056870772900b001a2a7bd4a4amr18483357oab.14.1687536762316; Fri, 23 Jun 2023 09:12:42 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a05:6359:6f9a:b0:130:e6dd:711c with HTTP; Fri, 23 Jun 2023 09:12:41 -0700 (PDT) From: =?UTF-8?Q?David_Fern=C3=A1ndez?= Date: Fri, 23 Jun 2023 18:12:41 +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 16:12:43 -0000 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 timin= g > (PNT), and explicitly evaluated two of these. The results in this paper > illuminate the *path to use of Starlink signals as a backup to traditiona= l > GNSS* for PNT." > > On Fri, Jun 23, 2023 at 6:09=E2=80=AFAM Joe Hamelin w= rote: > >> >> https://radionavlab.ae.utexas.edu/wp-content/uploads/2023/01/starlink_st= ructure.pdf >> >> Here's the PDF. >> >> On Fri, Jun 23, 2023 at 2:55=E2=80=AFAM Hesham ElBakoury via Starlink < >> 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 published i= n >>> 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