Subject: [IGEXMail-0059] GLONASS SLR Report
From: Tim Springer <[email-masked]>
Date: 05 Nov 1998 17:10:55

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IGEX Electronic Mail    05-Nov-1998 17:10:55                   Message No 0059
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Author: Tim Springer <[email-masked]>
Subject: GLONASS SLR Report

Author: T.A. Springer

Dear Colleagues,

Below we present a "GLONASS SLR Residual Analysis Report" which is similar to
our "GPS Quicklook Residual Analysis Report" which we generate on a daily
basis. For this analysis we used the SLR observations of the GLONASS satellites
together with our IGEX orbits (computed from GLONASS microwave observations)
and the ITRF96 coordinates of the SLR sites to obtain the difference between
the observed SLR ranges and the computed ranges. This report is based on the
SLR tracking data from October 10-19, 1998.

Unfortunately our IGEX (Glonass) orbits do not yet have the quality of our IGS
(GPS) orbits which means that we do not get down to the noise level of the SLR
observations. We have estimated our IGEX orbit quality to be of the order of
300-500 mm. The overall "RMS" (last line of this report) of the GLONASS SLR
Residual Analysis shows that the agreement between the GLONASS orbits and the 
SLR observations is about 400 mm. This corresponds quite well with our
estimated orbit error.

So please note that the field "RMS" does not reflect the noise of the SLR 
observations! It reflects the quality of our GLONASS orbits.

The CODE Analysis Center very much appreciates the enormous effort of all the 
SLR stations tracking the 9 GLONASS satellites (and the 2 GPS satellites!). We
sincerely hope you all can "keep up the good work". With this report we hope
to give you some useful feedback about the performance of your station. The SLR
tracking of the GLONASS satellites is of great importance for the IGEX
campaign. As soon as we have some more experience with both the microwave and
SLR tracking of the GLONASS satellites we will try to combine the two
measurement types. 

We hope that you find the information in this report useful. If you want more 
information, please feel free to contact us.

Kind Regards,
         Tim Springer
         Markus Rothacher
         CODE Analysis Center

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 Tim Springer                       Astronomical Institute, University of Berne 
 Tel:   +41 31 6318592              Sidlerstrasse 5, CH-3012 Bern, Switzerland  
 Fax:   +41 31 6313869              ftp: ubeclu.unibe.ch  -or-  130.92.6.17
 e-mail: [email-masked]          after login: cd "aiub$ftp"
 www:   http://www.cx.unibe.ch/aiub/
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 Center for Orbit Determination in Europe/
 Astronomical Institute, University of Berne (CODE/AIUB)
 GLONASS Residual Analysis Report

 Contact: T.A. Springer ([email-masked])

 Processing Strategy:
 --------------------

 - We used the SLR observations together with our IGEX orbits and the ITRF96 
   coordinates of the SLR sites to obtain the difference between the 
   observed SLR ranges and the computed ranges (OMC).

 - A summary of the resulting OMC residuals per station and satellite pass is
   generated. We have tried to make it look like the CSR Lageos-1 & Lageos-2 
   Quicklook Reports. (It is identical to our GPS Quicklook Reports)

 - The summary contains:
     STATION ID: Station CDP number and first characters of the station name
     SAT PRN   : The satellite number which for the Glonass satellites refers
                 to the "slot" number (see below).
     START PASS: Start time of the SLR observation pass
     DUR       : Duration of the SLR observation pass
     #OBS GOOD : Number of accepted SLR observations.
     MEAN      : Mean of the accepted OMC residuals            (in millimeters)
     RMS       : RMS of the OMC residuals around the MEAN.     (in millimeters)
     #OBS BAD  : Number of rejected SLR observations.
     MEAN      : Mean of the rejected OMC residuals                 (in meters)
     RMS       : RMS of the rejected OMC residuals around the MEAN. (in meters)

 - Currently only observations with OMC larger than 3 meters are rejected.

 - The "MEAN" will absorb possible range biases, to a large extent time 
   biases and part of the orbit error. At present both the "MEAN" and the
   "RMS" (around the mean) are dominated by the orbital errors. 

 - For those of you who are note familiar with the GLONASS slot numbers here
   a "translation table": SLR name: 68  70  69  79  65  66  62  71  72
                          Slot nr.:  3   4   6   9  12  16  17  20  22

 STATION ID       SAT  START PASSAGE   DUR   #OBS  MEAN  RMS   #OBS  MEAN   RMS
                  PRN  yy/mm/dd hh:mm (min)  GOOD  (mm) (mm)    BAD   (m)   (m)
 ------------------------------------------------------------------------------
 7237 CHANGCHUN    9   98/10/10 09:54    7     3   -446   29
 7237 CHANGCHUN    9   98/10/14 15:22   27     7    692   45
 7237 CHANGCHUN    9   98/10/15 13:07   59     6    791   86
 7237 CHANGCHUN    9   98/10/16 12:59   13     4    235   14
 7237 CHANGCHUN    9   98/10/17 10:33   39     9    125   15
 7237 CHANGCHUN    3   98/10/14 16:19   18     5   -205  132
 7237 CHANGCHUN    3   98/10/19 19:18   14     4     -1   29
 7237 CHANGCHUN   20   98/10/10 12:04    3     2   -922   17
 7237 CHANGCHUN   20   98/10/14 17:54   57     9   -381   25
 7237 CHANGCHUN   20   98/10/15 15:28   78     9   -699  151
 7237 CHANGCHUN   20   98/10/16 12:24   87     9    -48  228
 7237 CHANGCHUN   20   98/10/17 12:29   12     4   -304   20
 7237 CHANGCHUN    4   98/10/14 17:19   42    10   -380   56
 7237 CHANGCHUN    4   98/10/15 15:44   22     5   -233   64
 7237 CHANGCHUN    4   98/10/19 20:14   32     8    316   59
 7237 CHANGCHUN   12   98/10/10 13:58   38     7    620   54
 7237 CHANGCHUN   12   98/10/11 11:49   47     5    647  117
 7237 CHANGCHUN   12   98/10/12 10:34   11     3    448   37
 7237 CHANGCHUN   12   98/10/19 11:19   77     5    625  151
 7237 CHANGCHUN   22   98/10/10 15:07   45     5   -249  109
 7237 CHANGCHUN   22   98/10/11 13:23   20     4   -550   26
 7237 CHANGCHUN   22   98/10/12 10:09    3     2    101    4
 7237 CHANGCHUN   22   98/10/15 18:38   52    12    -11   25
 7237 CHANGCHUN   22   98/10/19 12:03   18     5    -71   42
 7237 CHANGCHUN   17   98/10/10 19:09    9     3    221   36
 7237 CHANGCHUN   17   98/10/11 16:58   89    12    235  122
 7237 CHANGCHUN   17   98/10/12 15:44    1     2   -595   50
 7237 CHANGCHUN   17   98/10/14 12:44   36     4   -640   58     1     4      0
 7237 CHANGCHUN   17   98/10/15 09:57   49    11    140   49
 7237 CHANGCHUN   17   98/10/19 16:43   93    11   -189   67
 7237 CHANGCHUN    6   98/10/14 18:58   54     8   -146   63
 7237 CHANGCHUN    6   98/10/15 17:39   55    11    -86   66
 7237 CHANGCHUN   16   98/10/14 13:33   54     9    538   89
 7237 CHANGCHUN   16   98/10/15 11:28   64     8    424   40

 7839 GRAZ         9   98/10/13 15:03   63     9   -558   21
 7839 GRAZ         3   98/10/10 11:48   52    12    132   35
 7839 GRAZ         3   98/10/13 06:53   72    12    -35   51
 7839 GRAZ        20   98/10/10 22:39  136    13   -182  139
 7839 GRAZ        20   98/10/13 17:33   35     8   -182    2
 7839 GRAZ         4   98/10/10 13:33   92    10    -25   40
 7839 GRAZ         4   98/10/11 12:53   68    14   -226   11
 7839 GRAZ         4   98/10/13 08:08   97    14   -648   91
 7839 GRAZ        12   98/10/11 10:29   57     8    415   42
 7839 GRAZ        22   98/10/13 21:33   89     7   -277   43
 7839 GRAZ        17   98/10/10 17:29   16     5     94   21
 7839 GRAZ        17   98/10/11 16:54   12     4    342    7
 7839 GRAZ        17   98/10/15 22:03   39     4    145   31
 7839 GRAZ         6   98/10/11 00:42  110    12    112   39
 7839 GRAZ        16   98/10/11 17:09   42     7   -134   10

 7110 MONUMENTPEA 20   98/10/10 13:19   63     8   -165   56
 7110 MONUMENTPEA 20   98/10/12 07:17  295    16     59   83
 7110 MONUMENTPEA 20   98/10/13 04:53  167    15   -201   44
 7110 MONUMENTPEA 20   98/10/17 13:28   67    13   -193   17
 7110 MONUMENTPEA 20   98/10/19 13:18    8     3    -52    6

 7090 YARRAGADEE   9   98/10/15 15:08  129     8    314  348
 7090 YARRAGADEE   9   98/10/17 12:21    0     1    366    0
 7090 YARRAGADEE   9   98/10/18 11:04  106     6    156    6
 7090 YARRAGADEE   3   98/10/17 05:42   19     3   -210   19
 7090 YARRAGADEE   3   98/10/19 15:03  182    15    -83   70
 7090 YARRAGADEE  20   98/10/14 12:47   13     4   -172   22
 7090 YARRAGADEE  20   98/10/15 10:59  586    30   -646  141
 7090 YARRAGADEE  20   98/10/16 11:34   17     5     86    9
 7090 YARRAGADEE  20   98/10/17 09:16   91     7     76   47
 7090 YARRAGADEE  20   98/10/18 06:49   36     6    178   10
 7090 YARRAGADEE   4   98/10/15 11:43    3     2     41    8
 7090 YARRAGADEE   4   98/10/17 07:28    8     3   -176    4
 7090 YARRAGADEE   4   98/10/18 05:04   21     4   -240   18
 7090 YARRAGADEE   4   98/10/19 16:59  196    11    -53   40
 7090 YARRAGADEE  12   98/10/10 14:38  212    18     99  245
 7090 YARRAGADEE  12   98/10/11 14:30   98    14    421  369
 7090 YARRAGADEE  12   98/10/12 11:54  161    12    451  424
 7090 YARRAGADEE  12   98/10/13 11:58   16     5    637   64
 7090 YARRAGADEE  12   98/10/18 14:00   45    11    369   15
 7090 YARRAGADEE  12   98/10/19 12:44  222    11    271  362
 7090 YARRAGADEE  22   98/10/17 11:13   64     7     40   49
 7090 YARRAGADEE  22   98/10/18 09:29   91    11   -237   36
 7090 YARRAGADEE  22   98/10/19 10:42   27     7    -67   13
 7090 YARRAGADEE  17   98/10/18 00:52   20     5    -31   27
 7090 YARRAGADEE  17   98/10/19 12:24  533    11   -420  196
 7090 YARRAGADEE   6   98/10/15 14:35  176     8     99  207
 7090 YARRAGADEE   6   98/10/16 13:09   27     7     32   32
 7090 YARRAGADEE   6   98/10/17 09:43  147    18    219  212
 7090 YARRAGADEE   6   98/10/18 07:53  132    17    -41   96
 7090 YARRAGADEE   6   98/10/19 21:02    8     3    256    9
 7090 YARRAGADEE  16   98/10/12 18:28   29     7   -194    6
 7090 YARRAGADEE  16   98/10/16 12:29   16     5    277   28
 7090 YARRAGADEE  16   98/10/17 12:07    0     1    196    0
 7090 YARRAGADEE  16   98/10/19 20:44  172    10   -526   55

 7843 ORRORAL      9   98/10/13 21:37    4     2   -227    7
 7843 ORRORAL      9   98/10/16 15:08    3     2     21   25
 7843 ORRORAL      3   98/10/14 10:39    8     3   -199    2
 7843 ORRORAL      3   98/10/15 09:20   11     4   -137   12
 7843 ORRORAL      3   98/10/16 09:21    0     1    111    0
 7843 ORRORAL     20   98/10/13 22:41    4     2    173   21
 7843 ORRORAL     20   98/10/16 10:13    3     2    -41   28
 7843 ORRORAL     20   98/10/17 08:24   11     4   -201   19
 7843 ORRORAL      4   98/10/14 14:54    8     3    131    9
 7843 ORRORAL      4   98/10/15 10:59    7     3   -103    1
 7843 ORRORAL      4   98/10/16 09:44    6     3   -110   13
 7843 ORRORAL     12   98/10/14 11:29   12     4    -96   16
 7843 ORRORAL     12   98/10/15 09:53    5     2    -60   20
 7843 ORRORAL     12   98/10/16 22:39    6     3    397   20
 7843 ORRORAL     17   98/10/14 09:03    3     2   -128   17
 7843 ORRORAL     17   98/10/15 08:04    6     3    357   22
 7843 ORRORAL     17   98/10/18 23:23    4     2    -58    3
 7843 ORRORAL      6   98/10/14 04:04    8     0      0    0     3****** 202818
 7843 ORRORAL      6   98/10/15 14:39    7     3   -300   22
 7843 ORRORAL      6   98/10/16 13:27    4     2   -150   14
 7843 ORRORAL     16   98/10/11 01:33    9     3   -520   11
 7843 ORRORAL     16   98/10/12 22:57    3     2   -300    8
 7843 ORRORAL     16   98/10/13 20:54    6     3   -318    8
 7843 ORRORAL     16   98/10/15 14:30    6     3    275   18
 7843 ORRORAL     16   98/10/16 13:00    8     3    199   27

 7105 GREENBELT   20   98/10/11 10:42   49     8     -7   28
 7105 GREENBELT   20   98/10/15 04:18   90     9   -494   49
 7105 GREENBELT   20   98/10/16 03:14    6     3   -210    9
 7105 GREENBELT   12   98/10/11 21:53    8     3    394    3
 7105 GREENBELT   12   98/10/14 17:14    3     2    224    4
 7105 GREENBELT   12   98/10/19 21:34  117    11    609  127
 7105 GREENBELT   16   98/10/11 14:46   25     6   -490   30
 7105 GREENBELT   16   98/10/14 23:04   18     5    379   13

 7210 MAUI        20   98/10/14 04:19    3     2   -301    2
 7210 MAUI        20   98/10/15 18:44   21     6   -633   17
 7210 MAUI        20   98/10/19 08:38   38     7   -106   14
 7210 MAUI        12   98/10/14 09:14   66    10    185  103
 7210 MAUI        16   98/10/12 04:13   13     4    -37    3
 7210 MAUI        16   98/10/18 09:08    3     2   -604    2
 7210 MAUI        16   98/10/19 05:13  184    15   -674   65

 7080 MLRS        20   98/10/13 07:32   17     5   -184    6
 7080 MLRS        20   98/10/14 07:59    2     2   -190   13
 7080 MLRS        20   98/10/15 02:47   79     7   -391   50

 7236 WUHAN        9   98/10/14 14:20   39    21    518  287
 7236 WUHAN        9   98/10/15 13:59   22    12    861  248
 7236 WUHAN       20   98/10/14 15:27   16    10    208  378
 7236 WUHAN       20   98/10/15 14:31   13     8   -204  175
 7236 WUHAN        4   98/10/14 15:47   16     9    342  169
 7236 WUHAN       16   98/10/14 13:00   51    27    429  186
 7236 WUHAN       16   98/10/15 11:23   25    14    349  255

 7837 SHANGHAI    17   98/10/15 10:23   28     7    470    8

 7836 POTSDAM      4   98/10/18 00:12   34     7    -34   23
 7836 POTSDAM     22   98/10/15 18:33   12     4     33   31
 7836 POTSDAM      6   98/10/19 23:18   18     5    378   26

 7810 ZIMMERWALD   9   98/10/19 19:26   12     4    130    7
 7810 ZIMMERWALD  20   98/10/19 21:41   56     6     93   41
 7810 ZIMMERWALD  12   98/10/19 22:27   80     6    713   70
 7810 ZIMMERWALD  22   98/10/19 23:06    3     2     53    2
 7810 ZIMMERWALD  17   98/10/16 19:17   83    14    197   14
 7810 ZIMMERWALD   6   98/10/19 23:16    2     2    518    1
 7810 ZIMMERWALD  16   98/10/16 20:20   10     2    489   52

 8834 WETTZELL     3   98/10/17 00:49   10    51   -155   45
 8834 WETTZELL    20   98/10/17 00:35   11    53    -57   38
 8834 WETTZELL    12   98/10/17 11:47   17    50    542   37
 8834 WETTZELL    17   98/10/16 20:18    4     2     83    1
 8834 WETTZELL    16   98/10/16 22:29   11   105    261   44

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