From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f171.google.com (mail-ob0-f171.google.com [209.85.214.171]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 6F2442006AA for ; Wed, 9 May 2012 15:31:25 -0700 (PDT) Received: by obfk16 with SMTP id k16so1957480obf.16 for ; Wed, 09 May 2012 15:31:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:cc:content-type; bh=OxM64/fx/9ov3ZTwj6ppW1faNCnEPfgCe2nzJtNZ3L8=; b=YvbaNGx0WDfagwtjp4B9tvU244NQuSYaB4aA3BxqQI1nhIkthP9S/4w4DimrDkE+GZ Fxi3dUFomlrWdOtKdvWJCi1+UnFEuCgq2vgNoKZ11xiq/2BpTK/rugF3kBu6qeh5e1Xp XQVaGahHY1FzjcLhGF3gYXMj6azkw4H9XcKjINUMBrto/ax1nPCekRoVkHLUFsbqHvFN HcrQh80cQHDtLyWPrS+xPpQEuit10P1xtWpC52dXYikUbe1/BNfyLUQaHQH1d6S67Se0 Jb9E78qqGVwrY0Vkj7cH2ZcO2lqDNzcOepNNGBLBlmQMu+5sQxRrWsIB9sQpAVJUHqqC 8hfg== Received: by 10.182.31.11 with SMTP id w11mr2551614obh.64.1336602669938; Wed, 09 May 2012 15:31:09 -0700 (PDT) MIME-Version: 1.0 Sender: tz2026@gmail.com Received: by 10.182.113.40 with HTTP; Wed, 9 May 2012 15:30:49 -0700 (PDT) In-Reply-To: <20120509211427.GA4099@thyrsus.com> References: <02af01cd2daf$05b24bb0$1116e310$@navisys.com.tw> <20120509164726.GA2102@thyrsus.com> <4FAAAE4F.80409@techstarship.com> <4FAAD66F.3090405@techstarship.com> <20120509211427.GA4099@thyrsus.com> From: tz Date: Wed, 9 May 2012 18:30:49 -0400 X-Google-Sender-Auth: VYpf9c0ZPcz-BjWCf6QA44svbRk Message-ID: To: esr@thyrsus.com Content-Type: multipart/alternative; boundary=14dae93a149558f9be04bfa20fbb Cc: thumbgps-devel@lists.bufferbloat.net Subject: Re: [Thumbgps-devel] Article -- Macx-1: GPS receiver with standard USB connector and PPS support X-BeenThere: thumbgps-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 May 2012 22:31:25 -0000 --14dae93a149558f9be04bfa20fbb Content-Type: text/plain; charset=ISO-8859-1 On Wed, May 9, 2012 at 5:14 PM, Eric S. Raymond wrote: > Ron Frazier (NTP) : > > > * May or may not be relevant, but, would 5 - 10 Hz position sensing > > improve accuracy and stability for your purposes? > > No, not for a timing GPS. And modules with multiHz sampling are tres > expensive. > Multi Hz is usually a feature of the chipset. If ti is Antares/Ublox it might be able to do 5Hz with WAAS or 10Hz without. (I have 3 Wintec Bluetooth/USB modules that use antares/ublox that I used because they were 10Hz, and they weren't that much more expensive and that was a few years ago). (Even my Skytraq 20Hz isn't that much more expensive). But that might be a good question - would WAAS improve the timing? If there is a "first batch": available, I'd sign up to be on it. --14dae93a149558f9be04bfa20fbb Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Wed, May 9, 2012 at 5:14 PM, Eric S. Raymond <esr@thyrsus.com> wrote:
Ron Frazier (NTP) <timekeepingntplist@techstarship.com>:

> * May or may not be relevant, but, would 5 - 10 Hz position sensing > improve accuracy and stability for your purposes?

No, not for a timing GPS. =A0And modules with multiHz sampling are tr= es
expensive.

Multi Hz is usually a feature of the ch= ipset.=A0 If ti is Antares/Ublox it might be able to do 5Hz with WAAS or 10= Hz without.

(I have 3 Wintec Bluetooth/USB modules that use antares/= ublox that I used because they were 10Hz, and they weren't that much mo= re expensive and that was a few years ago).
(Even my Skytraq 20Hz isn't that much more expensive).

But that = might be a good question - would WAAS improve the timing?

If there i= s a "first batch": available, I'd sign up to be on it.


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