Author:  AC Coordinator / AIUB/CODE

Ultra Rapid IGS Orbit Comparison - Week 1180   Day: 0 Hour: 00  (Aug 18, 2002)

Contacts: R. Weber (rweber@luna.tuwien.ac.at),
          H. Bock (bock@aiub.unibe.ch),
          R. Dach (dach@aiub.unibe.ch)


COMBINATION STRATEGY:

For a complete description of the combination strategy along with all tables 
and statistics, please refer to the IGS Final Combination reports posted on 
CDDIS within 13 days after the end of the GPS week.


REMARKS on IGS Ultra Rapid Orbit Comparison:


1. The following Ultra-rapid orbits were excluded from the combination but 
   kept for statistics:

            -> Centre: COU GFU SIU USU IGU 

_______________________________________________________________________________


Table 1: Daily transformation of each centre to the combined IGS Rapid orbit 
         and clocks (IGR). 

         WRMS - RMS weighted by the centres SP3 header accuracy codes.
         STA  - Number of stations in the daily solutions.
         Units: meters, mas, ppb, nano-sec, nano-sec/day.

Table 1.1180.0   GPS week: 1180   Day: 0   MJD: 52504.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
brd  n/a|0.13 0.47 0.15 -6.35 -4.26  6.61 -1.6 2.96 2.96 |    0.9    0.0   5.53
cou  n/a|-.05-0.04 0.01  0.09  1.25 -2.00 -0.4 0.34 0.16 |   -1.0   -5.5  16.86
gfu  n/a|-.01 0.01 0.01  0.22 -0.09 -0.74  0.0 0.18 0.15 |   -4.5   -6.0   5.90
siu  n/a|0.02-0.01-0.02  0.68  0.93 -0.50  0.2 2.42 2.51 |    0.0    0.0   0.00
usu  n/a|-.04-0.01 0.02 -0.11  0.12 -1.82  0.1 0.31 0.18 |-1727.8  -34.6   4.21
igu  n/a|-.03 0.01 0.02  0.04 -0.04 -1.11  0.1 0.21 0.12 |   -2.6   -3.0   4.42
igr  n/a|0.00 0.00 0.00  0.00  0.00  0.00  0.0 0.00 0.00 |   -0.5    1.5   0.00


Table 2: Daily fit for each satellite and each centre resulting from the 
         comparison of the individual solutions to the IGS Rapid solution. 

         The "igr" and "IGR" columns are zero since all centres are compared  
         to the "igr" solution. Eclipsing satellites are flagged with
         and "E" beside the PRN number.
         "MEDI" stands for median of the centre's satellite RMS.

         Units: cm.

Table 2.1180.0   GPS week: 1180   Day: 0   MJD: 52504.0

        Weighted Average
 PRN  | brd cou gfu siu usu igu igr  IGR |
------|----------------------------------|
   1  | 224   6   8   7  11   9   0    0 | 
   2  |  63 ---  13  22  51  32   0    0 | 
   3  | 185   8   3  12  16   8   0    0 | 
   4  | 228 151  18  60  98  57   0    0 | 
   5  | 115   8   6  11   6   5   0    0 | 
   6  | 289  19  44 144  19  30   0    0 | 
   7  | 174   7   7  18   6   4   0    0 | 
   8  | 116   6  56  35  92  72   0    0 | 
   9  | 140  23  23  23  11  13   0    0 | 
  10  | 203   7   8  69   5   6   0    0 | 
  11  | 110  25   6  33  11   7   0    0 | 
  13  | 248  13   9  11   8   5   0    0 | 
  14  |  60  24   9  33  19   7   0    0 | 
  15  | 184 --- --- --- --- ---   0    0 | 
  17  | >>> --- --- >>> --- ---   0    0 | 
  18  |  97  10   9  50   9   7   0    0 | 
  20  | 177  16  10  13   9   7   0    0 | 
  21  | 216 --- ---  29 --- ---   0    0 | 
  22  |  96  33  11  62  27  10   0    0 | 
  23  | 276  12   7  37 --- ---   0    0 | 
  24  | 247 ---  26 --- --- ---   0    0 | 
  25  | 192  12  11  34  57  33   0    0 | 
  26  |  52   8  17  39   5   8   0    0 | 
  27  | 152  68  25  92 --- ---   0    0 | 
  28  | 127   6  16  47  16  16   0    0 | 
  29  |  91  11  13  28   4   7   0    0 | 
  30  | 119  14  13  44  10  10   0    0 | 
  31  | 349  11   5  18   7   3   0    0 | 
------|----------------------------------|
 RMS  | 296  34  18 242  31  21   0      | 
 WRMS | 296  16  15 251  18  12   0      |
 MEDI | 176  12  11  34  11   8   0      |