Received: from cluster-jaune.cls.fr (cl1-jaune.cls.fr [91.207.20.90]) by sympa-ext.cls.fr (8.13.1/8.13.1) with ESMTP id p3BFn7mU006501 for ; Mon, 11 Apr 2011 15:49:08 GMT Received: by cluster-jaune.cls.fr (Postfix) id E0E6A144B47; Mon, 11 Apr 2011 15:49:07 +0000 (GMT) Delivered-To: ids.analysis.forum@ids-doris.org Received: from cluster-d.mailcontrol.com (cluster-d.mailcontrol.com [85.115.60.190]) by cluster-jaune.cls.fr (Postfix) with ESMTP id B72D87D234 for ; Mon, 11 Apr 2011 15:49:07 +0000 (GMT) Received: from chappe.cnes.fr (chappe.cnes.fr [132.149.22.2]) by rly40d.srv.mailcontrol.com (MailControl) with SMTP id p3BFn5O1008511 for ; Mon, 11 Apr 2011 16:49:07 +0100 Received: from cnes.fr by cnes.fr; Mon, 11 Apr 2011 17:49:05 +0200 (CEST) Received: from cnes.fr by cnes.fr; Mon, 11 Apr 2011 17:49:05 +0200 Received: from cnes.fr by cnes.fr; Mon, 11 Apr 2011 17:49:05 +0200 (CEST) Received: from cnes.fr by cnes.fr; Mon, 11 Apr 2011 17:49:05 +0200 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Date: Mon, 11 Apr 2011 17:49:04 +0200 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Error in CoM correction field of Cryosat-2 DORIS 2.2 files Thread-Index: Acv4X/vRaJ4uxaHQSiWIbjRWs1gLOw== From: "Cerri Luca" To: Cc: "Couhert Alexandre" , "Houry Sabine" , "Flavien Mercier" , "E Schrama" , X-OriginalArrivalTime: 11 Apr 2011 15:49:05.0495 (UTC) FILETIME=[FCACB670:01CBF85F] X-Mailcontrol-Inbound: tz6Sw7ZD8m5uMdaY9TbUI!1mlVxgI8bEdRprAwudHqk= X-Spam-Score: -1.9 X-Scanned-By: MailControl A_10_80_00 (www.mailcontrol.com) on 10.68.0.150 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by sympa-ext.cls.fr id p3BFn7mU006501 X-Validation-by: lsoudarin@cls.fr Subject: [ids.analysis.forum] Error in CoM correction field of Cryosat-2 DORIS 2.2 files Dear all, We have recently discovered a bug in our processing of DORIS 2.2 measurements files for the CRYOSAT-2 satellite. The bug concerns a wrong configuration file describing the phase center position of DORIS antenna. This error affects the CoM correction and the ionospheric correction fields in the DORIS measurement files between arc 031 and arc 048 . The correct file has been restored and measurement files frome arc 049 onward will be correct. Wrong files will be replaced as soon as possible, within two weeks. The impact on the orbit is completely negligible, however the impact on station positioning is not negligible. The error committed in the phase center position is 2 GHz phase center : Correct value : 0.312 m Wrong Value : 0.319 m Error : 0.007 m 400 MHz phase center: Correct value : 0.158 m Wrong value : 0.155 m Error :-0.003 m The impact on the ionospheric correction field is expected to be negligible : ~(7 mm + 3 mm)/(25-1) ~ 0.4 mm (25 is the square of doris frequency ratio) However the impact on the CoM correction field is in the order of 7 mm, and users of CoM correction field should see the impact in their scale factor. Please, let me know if you spot any discontinuity in your Cryosat-2 series starting from arc 031, On behalf of the CNES POD Team, I apologize for the inconvenience that this error might have caused to your processing, and will give you as soon as possible further updates. Best regards Luca __________________________________ Luca CERRI Centre National d'Etudes Spatiales DCT\SB\OR 18, av Edouard Belin 31401 Toulouse Cedex 09 - FRANCE tel. +33 (0)5 61283549 fax +33 (0)5 61281855 bpi 1323 email luca.cerri@cnes.fr Cliquez sur l'url suivante https://www.mailcontrol.com/sr/47QngNHuxuvTndxI!oX7UvPXYWN6neOGyRSVuEA9TfHPsiIRyEMVMv7b46ukrAgadGwjpm0YehUpdY6WjzZSeg== si ce message est indésirable (pourriel).