From: Peter Pesec Subject: [IGSMAIL-2442] IGS site GRAZ, rearrangements-proposal Date: Mon, 23 Aug 1999 0:07:10 PDT ****************************************************************************** IGS Electronic Mail Mon Aug 23 0:07:10 PDT 1999 Message Number 2442 ****************************************************************************** Author: Peter Pesec Subject: IGS site GRAZ, rearrangements-proposal At present the observatory Graz-Lustbuehel in Austria operates 3 receivers with different dome-numbers and 4-char IDs: 11001M002: , Turborogue SNR-8000 --> 30-sec sample, main IGS site 11001M003: , Trimble 4000SSI --> DGPS site, 1-sec sample, hourly files 11001M004: , Ashtech Z-18 --> IGEX site, 1-sec sample rate, hourly files optional. All three receivers are working continuously, during the last month no data gaps could be detected for all receivers - in particular the Z-18 was working well, in contrary to data gaps reported elsewhere. First of all I would like to raise the general question wheather a station cluster which is centered to the mm-level can also be regarded as equivalent by IGS and/or EUREF - that means it makes no difference to use particular data from , which makes sense if one of the receivers is malfunctioning. In that case no action is required for Graz, we simply disseminate the appropriate data-files. We see however problems if IGS and/or EUREF only acknowledge the receiver situated above the main point (presently a Turborogue). We are not in the position to guarantee hourly data from the Turborogue, the percentage of COM-errors is about 2, which means that every 50th downloading leads to a blocking of the communication line, which is not reliable for 24 downloadings per day. Moreover the well-known ionospheric problems affect the Turborogue efficiency. One way out of this dilemma is to change receiver positions - i.e. to place the Z-18 or the 4000SSI on the main point and to operate the others on the auxilary points. In that case the installation of the Z-18 at the main pint would be the logical promising continuation of the IGEX-project. Here we can deliver pure GPS-Rinex-files, pure GLONASS-Rinex-files or combined ones of any sample rate and of arbitrary length (hourly, half-hourly, ..) as 1-sec data are stored in the PC for about half a year. This statement is also valid for the Trimble 4000SSI. I kindly ask the IGS- and EUREF-analysis centers to discuss this question. Best regards Peter -- ---------------------------------------------------------------- Dr. Peter Pesec Tel : +43-316-467350 Space Research Institute, Fax : +43-316-467356 Department Satellite Geodesy Mail: peter.pesec@oeaw.ac.at Austrian Academy of Sciences Lustbuehelstrasse 46, A-8042 Graz ---------------------------------------------------------------- [Mailed From: Peter Pesec ]