Author:  AC Coordinator / NRCan GSDivision

Rapid IGS Orbit Prediction Combination - Week 0914   Day: 1   (Jul 14, 1997)

Contacts: J. Kouba (kouba@geod.emr.ca), Y. Mireault (mireault@geod.emr.ca)


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 11 days after the end of the GPS week.


REMARKS on IGS Rapid Orbit Prediction Combination:


1. Clock corrections found in the IGP sp3 orbit file are clock predictions 
   provided by COP. Users are reminded to use them with extreme caution.

_______________________________________________________________________________


Table 1: Daily transformation of each centre to the combined IGP orbit and
         clocks. 

         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 1.0914.1   GPS week: 0914   Day: 1   MJD: 50643.0

CENT STA|  DX   DY   DZ    RX    RY    RZ  SCL  RMS WRMS |   TOFT  TDRFT    RMS
--------|------------------------------------------------|---------------------
cop  n/a| .00 -.01 -.05  -.56  1.20  1.57   .5  .48  .29 |     .0     .0     .0
emp  n/a| .00  .00  .07   .67  1.46  4.73  -.4  .98  .64 |     .0     .0     .0
esp  n/a| .01  .00 -.01  1.50  -.29 -1.14   .6 1.22  .18 |     .0     .0     .0
gfp  n/a| .00  .00  .03   .05 -1.08   .76  -.3  .32  .24 |     .0     .0     .0
jpp  n/a|-.01 -.01  .00   .12  -.28  2.38   .4  .64  .21 |     .0     .0     .0
sip  n/a| .01  .00  .04  -.66   .29-10.75  -.4  .59  .59 |     .0     .0     .0


Table 2: Daily fit for each satellite and each centre resulting from weighted
         average combination. 

         The last column gives the IGP resulting satellite accuracy measures 
         found in the IGP SP3 header. 
         "MEDI" stands for median of the centre's satellite RMS.

         Units: cm.

Table 2.0914.1   GPS week: 0914   Day: 1   MJD: 50643.0

               Weighted Average
 PRN  | cop emp esp gfp jpp sip  IGP |
------|------------------------------|
   1  |  19  17  11  17  11  31    8 | 
   2  |  46  28   7  15  12  92   18 | 
   3  |  22  28  25  22   7  26   10 | 
   4  |  13 109  21  11  21  39   15 | 
   5  |  21  24  21   7  35 115   20 | 
   6  |  11  36  10  20  24  19    9 | 
   7  |  30  80  14  11  36  61   17 | 
   9  |  38  55  11  39   9  17   15 | 
  10  |  43 133  44 --- ---  27   36 | 
  14  |  24 235 277 ---  22  17   61 | 
  15  |  18  40  11  15  24  57   12 | 
  16  | 119 252  50 ---  29  62   55 | 
  17  |  31  19  16  13  24  30   10 | 
  18  |  16  20  15  34  19  22   11 | 
  19  |  16  25  22  13  16  19    8 | 
  21  |  55 166 282  99  66 108   54 | 
  22  |  36  19   9  22  10  22   10 | 
  23  | 148 --- 457 --- 286  94  146 | 
  24  |  23 137  13  18   8  79   21 | 
  25  |  23  18  24  19  45  78   17 | 
  26  |  15  23  14  29  18  97   18 | 
  27  |  12  44  28  17  13  58   12 | 
  29  |  28  21   8  30  12  26   11 | 
  30  |  32 125  11  31  30  19   19 | 
  31  |  51  44  21  48   8  34   18 | 
------|------------------------------|
 RMS  |  48  98 122  32  64  59      | 
 WRMS |  29  64  18  24  21  59      |
 MEDI |  24  38  16  19  20  34      |