X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Received: from [24.51.79.189] (account rob HELO [10.1.1.3]) by logan.com (CommuniGate Pro SMTP 5.1.4) with ESMTPSA id 1743149; Mon, 08 Jan 2007 01:03:41 -0500 Message-ID: <45A1DEBD.5030304@Logan.com> Date: Mon, 08 Jan 2007 01:03:41 -0500 From: Rob Logan User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.0.8) Gecko/20061030 SeaMonkey/1.0.6 MIME-Version: 1.0 To: Lancair Mailing List Subject: Re: [LML] Re: AHRS References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit > the more expensive Crossbow 500 which is purely inertial the 500 uses both gps and airdata for aiding. this was added in CFS v4.1 and refined in CFS v5.0 early 2004. CFS spent quite abit of time at xbow, on CFS expense to refine this aiding. its a long story. you can see the hole aiding packet received via 232 in the xbow manual on page 30 http://xbow.com/Support/Support_pdf_files/AHRS500GA_Operators_Manual.pdf this reduced acceleration errors, commonly seen as a tilt on landing. > Pinpoint's single page web site if their unit is GPS augmented > or entirely inertial. Pinpoint/Chelton uses 3d accelerometer, 3d rate, 3d flux, airdata, gps (internal or external) internal temp and internal heater with oat and lots of kalman filter like math to control drift and provide an inertial fix. wonder how the http://www.cheltonsatcom.com antenna's stay fixed on a point? > GPS in the Pinpoint is standard or an option CFS needs some kinda gps... you can buy a freeflight, garmin gps35, (don't use the gps18, but it will work) or one that's an option on the pinpoint/chelton. > so you'd have to add the ADC function to a Crossbow installation. very good point.. if any d2a depositors are too upset to spend another $10,300 pls forward your proof of deposit and I'll mail you $5,000. that is if CFS's deal is transferable which I kinda doubt. Rob