From: Jon Clarke Date: 13 Dec 1999 20:11:35 Subject: [IGEXMail-0583] NPL Igex station restarts Reply-To: IGEX Mail Sender: IGEXMail-owner@ensg.ign.fr Precedence: list ****************************************************************************** IGEXMail 13-Dec-1999 20:11:35 Message No 0583 ****************************************************************************** Author: Jon Clarke Subject: NPL Igex station restarts ------ =_NextPart_000_01BF459A.E20DD260 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear Colleagues,=20 I am happy to announce that NPL is once again gathering data from our 3S = Navigation R100-40T receiver, NPLC.=20 This follows a disappointingly long period since July 27 of this year in = which either the R100 receiver or myself were not available. There is = some data during this 127 day gap, but not much - I shall process and = contribute any worthwhile lengths.=20 Tonight I shall tentatively FTP the data for MJDs 51513 - 51517 to BKG = to restart our contribution to IGEX (TEQC.exe did not report any severe = problems with this data).=20 Our contributions should then continue as "normal" if there are no = problems, and the receiver continues working. Also, the CCTF-format = common view data from NPLC is now being posted to the NPL ftp site again = (please see attached text files).=20 Note on R100 phase resets ------------------------- Other users may not be aware that the R100 appears to reset all its = carrier phase measurements to 50000000 cycles upon receipt of the = "HEADER" command (which must be sent if the raw data is gathered via the = serial port and then processed into Rinex). This has been confirmed by = several other R100 users, and it caused all NPLC measurements taken = before July 27 to have hourly resets to that value. This should now only = occur at midnight, as I now only collect data into daily files.=20 Note on incorrect ordering of R100 measurements ----------------------------------------------- Also, I have been informed by BKG that some NPLC Rinex files have some = measurements in the wrong order, and again this has been experienced by = at least two other R100 users - please be aware of this if you use our = data.=20 My apologies for the severe delay in restarting our contributions.=20 Regards, Jon Clarke ------------------------------------------------------------------------ Mr Jon Clarke Time and Frequency Section, jon.clarke@npl.co.uk Centre for Electromagnetic and Time Metrology, tel: +44 (0) 20 8943 6548 National Physical Laboratory, fax: +44 (0) 20 8943 7138 Queens Road, Teddington, TW11 0LW, U.K. ------------------------------------------------------------------------ ------ =_NextPart_000_01BF459A.E20DD260 Content-Type: application/ms-tnef Content-Transfer-Encoding: base64 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