From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) (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 1114B3CB37 for ; Fri, 23 Jun 2023 09:17:21 -0400 (EDT) Received: by mail-ed1-x536.google.com with SMTP id 4fb4d7f45d1cf-51be5db4e35so613521a12.1 for ; Fri, 23 Jun 2023 06:17:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687526240; x=1690118240; h=cc:to:subject:message-id:date:from:reply-to:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=gWNZxJZmBXGNMGlxDz4XZNe3QSEyLLTC9fR+p3XJFvc=; b=gdyEY83fdljLokvR4T6944b57XssOZPfGXdxYqfGR9etkwOFiWCUWxAsDmggJPQyyA lSTDBHN5/8p3rEZF9BbaN2LKBMzIb3dLmzR+1pMe86oka0c1lTvU4ATcW8iVOUm533XD Z6yXznuaT7+zoOIJ250XbOnXjwTrd5Q5ct/kwRGLV6ISUZYNfmLy2WY82taFf00QYKQH dleIs3IhNctaAnXmxPD352XSYD9GWi8EzoU6owjurL6OXNM6BdjdqVaKyN7qr9ABdKlt 3LbHuZYld9arzedmM5yvkB9x8fJlbvmtvXRKSNROckrDQh6dEGdu44sgb8tJak9yl0Oj w4Hw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687526240; x=1690118240; h=cc:to:subject:message-id:date:from:reply-to:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=gWNZxJZmBXGNMGlxDz4XZNe3QSEyLLTC9fR+p3XJFvc=; b=eKWXBM6NGEMW5jxCWix4sEwmfGRU5NOJ6gz9iaGsh8Qs37GIza6KpzntBa4jt+jCKU j5TVqYM1LqBwisY14b0aV3Q7zUJAspgt4ieKK3PLRT/UVVF11onvwhVaRPQiuj4h1UrW OoP987lVFbwqRRaxr1AJE8MixDtmHjy2hJ7e5LDqmnc/wjw2o9bj771JzlidnNtYyrJ2 DTd1+vYHcaRmoJk4KurWXNPN30DlCNXHYUE46xspP1hyZtEKeGwRelpLK0zynkqKvanZ ZElIbC74yAX1uUpyADvrYMFxmzf7dnDRo4kCovwxCY+GuZYSr9Y03UbK0mjkhsLmM16/ xZWw== X-Gm-Message-State: AC+VfDypbW3Phqg3UweSdhfBkc0bPOz/jshPh6jqmz+NwoxQ6WVPtrkB ySjxztc2+b1GucttSMtVBv2ra29CN/OiN7lYr4I= X-Google-Smtp-Source: ACHHUZ5+bept1GLw0ylTUuNo//g7c6uAY75H5WBec1Ynj/YijDWQgzAbbI7IE7msCok/YtJt+8B13SokBwSye38jXYE= X-Received: by 2002:a17:907:7255:b0:989:55b4:416a with SMTP id ds21-20020a170907725500b0098955b4416amr8814854ejc.35.1687526239515; Fri, 23 Jun 2023 06:17:19 -0700 (PDT) MIME-Version: 1.0 References: <71psq926-osqr-70n0-264s-363162o77958@qbaryna.pbz> <2d6314f0-1742-20c0-ab0d-7f5fcdf3809b@mtcc.com> <84894b58-528a-a032-3f3d-a884f5b4a24f@tinka.africa> <95633c24-c7c0-e0d9-3c74-d946acfccb41@mtcc.com> <09222329-da10-21c2-9905-0b9a23d86852@gmail.com> In-Reply-To: Reply-To: joe@hamelin.us From: Joe Hamelin Date: Fri, 23 Jun 2023 06:17:08 -0700 Message-ID: To: Hesham ElBakoury Cc: starlink@lists.bufferbloat.net Content-Type: multipart/alternative; boundary="0000000000000e3cbc05fecbd210" 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 13:17:21 -0000 --0000000000000e3cbc05fecbd210 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 paper 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 wro= te: > > https://radionavlab.ae.utexas.edu/wp-content/uploads/2023/01/starlink_str= ucture.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 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 > --=20 -- Joe Hamelin, W7COM, Tulalip, WA, 360-474-7474 --0000000000000e3cbc05fecbd210 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
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 paper illuminate the path to use of Starlink signals as a backup to traditional GNSS for PNT."
On Fr= i, Jun 23, 2023 at 6:09=E2=80=AFAM Joe Hamelin <nethead@gmail.com> wrote:
https://radionavlab.ae.utexas.edu/wp-content/uploads/2023/01/st= arlink_structure.pdf

Here's the PDF.

On= Fri, Jun 23, 2023 at 2:55=E2=80=AFAM Hesham ElBakoury via Starlink <starlink@l= ists.bufferbloat.net> wrote:
Has anyone looked at this paper (Signal Structure of th= e Starlink
Ku-Band Downlink) by Todd E. Humphreys ? This paper will be published in IEEE Transactions on Aerospace and Electronic Systems. Are there other
research efforts which try to do the same?

Thanks

Hesham


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Joe Hamelin, W7COM, Tulalip, WA, 360-474-7474


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Joe Hamelin, W7COM, Tulalip, WA, 360-474-7474
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