Received: from hector.cls.fr (osis.cls.fr [62.161.32.21]) by sympa.cls.fr (8.13.1/8.11.2) with ESMTP id m8TFiP2O002099 for ; Mon, 29 Sep 2008 15:44:25 GMT Received: by hector.cls.fr (Postfix) id EE755ABE8E; Mon, 29 Sep 2008 15:44:24 +0000 (GMT) Delivered-To: ids.analysis.forum@cls.fr Received: from CLS-NHUNFAT.cls.fr (unknown [10.1.254.35]) by hector.cls.fr (Postfix) with ESMTP id B391B14999A; Mon, 29 Sep 2008 15:44:24 +0000 (GMT) Message-Id: <7.0.1.0.2.20080929173924.0381fdd8@cls.fr> X-Mailer: QUALCOMM Windows Eudora Version 7.0.1.0 Date: Mon, 29 Sep 2008 17:44:24 +0200 To: "Pascal Willis" , ids.analysis.forum@cls.fr From: Beatrice Nhun Fat In-Reply-To: <55006.82.121.91.76.1222522712.squirrel@webmail.ipgp.jussie u.fr> References: <55006.82.121.91.76.1222522712.squirrel@webmail.ipgp.jussieu.fr> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_441696079==.ALT" X-Validation-by: laurent.soudarin@cls.fr Subject: Re: [Fwd: [ids.analysis.forum] Beacon event: REUB] --=====================_441696079==.ALT Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: quoted-printable Dear Pascal, dear all Concerning REUB (La Reunion) recent problems and=20 what to do in order to detect such anomalies, it=20 is clear that SSALTO operations should play a key rule. In late August, I have pointed out the effects of=20 connection problem between the antenna and the beacon (see attached file). What we must improve now is , as you said, the distribtion of information. A plot of routine station coordinates over 2 days=20 for REUB is available at=20 ftp://ftp.cls.fr/pub/ids-cls/operations/REUB-2days-SSALTO.jpeg=20 . 50 cm in height really likes as if cables had=20 been inverted between 2GHz and 400MHz center of phase. Such plot is not generated everyday for all the=20 stations. However, we generate every day a=20 summary of stations that may face problems (very=20 few data or coordinates biais). Those last months we focussed our attention on=20 monitoring possible station displacement due to=20 earthquakes in the vicinity of a DORIS station.=20 We should improve the warnings based on routine SSALTO/positioning. In addtion to your propositions of discussion at=20 the next IDS meeting, my feeling is that a=20 responsable for transmitting permanently the=20 information from the DORIS system and its=20 operations to IDS is missing. The person would=20 also be in charge of managing the questions from=20 the IDS users and transfering to the technical responsables. Best regards B=E9atrice Nhun Fat CLS Le 15:38 27/09/2008,Pascal Willis =E9crit: >Dear all, > >I confirm that the data problem raised by Laurent Soudarin is a major >problem for DORIS data processing when generating station coordinates >solutions (errors are up to 1 meter!). Thanks Laurent for checking and for >putting those plots on Internet > >Looking at station coordinate residuals, I would suggest to delete DORIS >data from REUB >from 27-APR-2008 to 26-JUL-2008 (both included). This will be the >recommendation in the next update of DPOD2005 > >The good news is that after this period, data quality and results are back >to normal for REUB. So it seems that the cable connection was solved > >The problem that I see is that it took 5 months for such a critical >information to be disseminated properly throughout the IDS Analysis >Centers. > >My personnal conclusion is that we should discuss this issue briefly at a >future IDS meeting and find solutions to be more efficient in circulating >such warnings. It could come from : > >- special care of groups in Toulouse to distribute important information >(not all the information, but specific warning when needed) > >-better verifications by ACs of their internal products (I had similar >plots generated automatically but I did not check them for several months) > >- automatic verification of any new SINEX solution by the combination >center (even if only 1 solution is available for this week) > >- ... > >Best regards >Pascal > >---------------------------- Message original ---------------------------- >Objet: [ids.analysis.forum] Beacon event: REUB >De: "Laurent Soudarin" >Date: Ven 26 septembre 2008 17:31 >=C0: ids.analysis.forum@cls.fr >-------------------------------------------------------------------------- > >Dear colleagues, > >REUB POE residuals increased from 0.45 mm/s to 0.9 mm/s between >24.04.2008 and 29.07.2008. >This was reported by the CNES operation coordination group as a >problem with the beacon connection. > >You may look at the POE residuals at: >ftp://ftp.cls.fr/pub/ids/stations/statpoe/statpoe_sta_REUB_2008.pdf > > >Best regards, > >Laurent > > >**************************************************************************= ****************** >Laurent Soudarin CLS >Tel : +33 (0)5 61 39 48 49 DT/MSS >Fax : +33 (0)5 61 39 48 06 Parc Technologique du Canal >e-mail: laurent.soudarin @ cls.fr 8-10 rue Hermes > 31520 Ramonville > FRANCE >**************************************************************************= ****************** > > > >----------------------------- >Pascal Willis >Institut de Physique du Globe de Paris >UFR STEP / GSP Bat Lamarck Case 7011 >75205 Paris Cedex 13 France >Phone: +33-(0)1 57 27 84 81 >Em: willis@ipgp.jussieu.fr >http://www.ipgp.jussieu.fr/~willis >----------------------------- --=====================_441696079==.ALT Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear Pascal, dear all

Concerning REUB (La Reunion) recent problems and what to do in order to detect such anomalies, it is clear that SSALTO operations should play a key rule.
In late August, I have pointed out the effects of connection problem between the antenna and the beacon (see attached file).
What we must improve now is , as you said, the distribtion of information.


A plot of routine station coordinates over 2 days for REUB is available at ftp://ftp.cls.fr/pub/ids-cls/operations/REUB-2days-SSALTO.jpeg . 50 cm in height really likes as if cables had been inverted between 2GHz and 400MHz center of phase.
Such plot is not generated everyday for all the stations. However, we generate every day a summary of stations that may face problems (very few data or coordinates biais).

Those last months we focussed our attention on monitoring possible station displacement due to earthquakes in the vicinity of a DORIS station. We should improve the warnings based on routine SSALTO/positioning.


In addtion to your propositions of discussion at the next IDS meeting, my feeling is that a responsable for transmitting permanently the information from the DORIS system and its operations to IDS is missing. The person would also be in charge of managing the questions from the IDS users and transfering to the technical responsables.

Best regards

B=E9atrice Nhun Fat
CLS



Le 15:38 27/09/2008,Pascal Willis =E9crit:
Dear all,

I confirm that the data problem raised by Laurent Soudarin is a major
problem for DORIS data processing when generating station coordinates
solutions (errors are up to 1 meter!). Thanks Laurent for checking and for
putting those plots on Internet

Looking at station coordinate residuals, I would suggest to delete DORIS
data from REUB
from 27-APR-2008 to 26-JUL-2008 (both included). This will be the
recommendation in the next update of DPOD2005

The good news is that after this period, data quality and results are back
to normal for REUB. So it seems that the cable connection was solved

The problem that I see is that it took 5 months for such a critical
information to be disseminated properly throughout the IDS Analysis
Centers.

My personnal conclusion is that we should discuss this issue briefly at a
future IDS meeting and find solutions to be more efficient in circulating
such warnings. It could come from :

- special care of groups in Toulouse to distribute important information
(not all the information, but specific warning when needed)

-better verifications by ACs of their internal products (I had similar
plots generated automatically but I did not check them for several months)

- automatic verification of any new SINEX solution by the combination
center (even if only 1 solution is available for this week)

- ...

Best regards
Pascal

---------------------------- Message original ----------------------------
Objet:   [ids.analysis.forum] Beacon event: REUB
De:      "Laurent Soudarin" <laurent.soudarin@cls.fr>
Date:    Ven 26 septembre 2008 17:31
=C0:       ids.analysis.forum@cls.fr
--------------------------------------------------------------------------<= br>
Dear colleagues,

REUB POE residuals increased from 0.45 mm/s to 0.9 mm/s between
24.04.2008 and 29.07.2008.
This was reported by the CNES operation coordination group as a
problem with the beacon connection.

You may look at the POE residuals at:
ftp://ftp.cls.fr/pub/ids/stations/statpoe/statpoe_sta_REUB_2008.pdf


Best regards,

Laurent


***************************************************************************= *****************
Laurent Soudarin           &= nbsp;           &nbs= p;  CLS
Tel : +33 (0)5 61 39 48 49             DT/MSS
Fax : +33 (0)5 61 39 48 06            Parc Technologique du Canal
e-mail: laurent.soudarin @ cls.fr     8-10 rue Hermes
            &nb= sp;            =             &nb= sp;            =   31520 Ramonville
            &nb= sp;            =             &nb= sp;            =   FRANCE
***************************************************************************= *****************



-----------------------------
Pascal Willis
Institut de Physique du Globe de Paris
UFR STEP / GSP Bat Lamarck Case 7011
75205 Paris Cedex 13 France
Phone: +33-(0)1 57 27 84 81
Em: willis@ipgp.jussieu.fr
http://www.ipgp.jussieu.fr/~willis
-----------------------------
--=====================_441696079==.ALT--