Subject: [IGSREPORT-1019] ESA07517.SUM
From: ESOC IGS-team
Date: Thu, 9 Jun 1994 10:34:46 PDT

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IGS Electronic Report    Thu Jun  9 10:34:46 PDT 1994      Message Number 1019
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Author: ESOC IGS-team
Subject: ESA07517.SUM

Subject: ESA07517.SUM

 -------------------------
 ANALYSIS CENTRE: ESA/ESOC
 -------------------------

 OUTLINE OF THE ESTIMATION OF GPS-ORBITS AND EARTH ROTATION PARAMETERS
 AT THE ESOC PROCESSING CENTRE FOR IGS

 J.M.Dow, T.Martin-Mur, J.Feltens, C.Garcia-Martinez, M.A. Bayona-Perez

 Description of analysis for period 1994 May 29 - Jun 04
                                                        (week 0751)
 1. SOFTWARE USED:   GPSOBS/BAHN-Version 5

 2. MODELS USED AND PARAMETERS ESTIMATED/FIXED:

  For a description of models and parameters used ==> see IGS - Mail  51
  For updates of the models and parameters used   ==> see IGS - Mail 114 and
                                                      see IGS - Rep. 224,277
 3. REMARKS:

    - From this week we have started to use a modified strategy for
    clock bias estimation. We are obtaining (but not using for the
    estimation) the residuals of double differenced pseudo-ranges and
    using them to estimate daily pseudo-range biases, using the
    following assumptions:
      - P-code pseudo-ranges are not biased.
      - The biases for CA-code pseudo-ranges for TurboRogue receivers
         have an apriori value of zero, with an uncertainty of 1 metre.
      - If a receiver is not tracking P-code pseudo-ranges, its
         average CA-code bias is zero.
      - If the std. dev. about the average of the values of the CA-code
         biases for a receiver is less than 3 metres, all of them are
         the same and equal to the average value.
    Only those combinations receiver-satellite for which it is possible
    to observe and estimate a bias using the previously defined
    procedure are used for clock bias estimation. As an example, for
    this week we were not able to obtain pseudo-range biases for MCMU,
    it seems that the value of the bias is pass dependent and not
    satellite dependent. For PAMA, only 3 to 4 biases are observable
    every day (sv 10, 17, 35, 39), but this can be because the way
    we do our dd combinations. It was not possible to obtain a value
    for the bias of sv-27 for non TurboRogue receivers for the last day,
    because they changed from AS to non AS tracking.
    We expect to obtain clock bias rms in the order of 1 metre (3 ns),
    that is the level of noise for the pseudo-ranges needed for
    clock bias initialization (this value including measurement noise
    and bias uncertainty).

 4. GROUND STATIONS: Altamimi and Boucher, IGS Mails 421 and 430,
                     ITRF92 at 1994.0 and localtie.tab.
 _______________________________________________________________________
 GPSweek|ALGO  GOLD  KIRU  KOUR  MCMU  PIE1  TAIW  TSKB  YAR1  |f |e |t
 0751___| AREQ  HART  KOKB  MADR  PAMA  RCM5  TIDB  USUD  YELL |i |s |o
    |DAY|  FAIR  HOB1  KOSG  MASP  PERT  SANT  TROM  WETT      |x.|t.|t.
 ---|---|------------------------------------------------------|--|--|--
    |149| FeF   FF-   eFF   eFe   --e   eeF   eFF   eeF   FF   |13|10|23
    |150| FeF   FFe   eFF   eFe   eee   -eF   eFF   eeF   FF   |13|12|25
    |151| FeF   FFe   eFF   eFe   eee   -eF   eFF   eeF   FF   |13|12|25
    |152| FeF   FFe   eFF   eFe   eee   -eF   eFF   eeF   FF   |13|12|25
    |153| FeF   FFe   eFF   eFe   eee   -eF   eFF   eeF   FF   |13|12|25
    |154| FeF   FFe   eFF   eFe   eee   -eF   eFF   eeF   FF   |13|12|25
    |155| FeF   FF-   eFF   eFe   eee   --F   eFF   eeF   FF   |13|10|23

    with: "F" ... coordinates of ground station kept fixed,
          "e" ... coordinates of ground station estimated,
          "-" ... ground station not included on that day.

 5. ORBIT FIT MINUS EXTRAPOLATION FROM PREVIOUS DAY, RMS IN <CENTIMETER>

  \DAY|  149   150   151   152   153   154   155
   \  |
    \ |
  SAT\|
  ----|-------------------------------------------
   02 |   72    70   103    32    85    83    68
   12 |   56   102    47    78    29    84    28
   14 |   81    38    45    27    37    40    30
   15 |   89    95    45    76    80    95    93
   16 |   63    84    23    25    39    26    28
   17 |   58    62    93    32    50    60    53
   18 |   44    72    64    44    29    50    51
   19 |   64    97    67    74    40    54    69
   20 |   61    75    84    28   130    43    87
   21 |   35    56    24    23    34    24    23
   22 |   55    65    66    43    58    62    96
   23 |   21    44    30    27    14    26    30
   24 |  112    93    64    66   117    66   103
   25 |   65    97    58    51    76    54    73
   26 |   39   157    36    43    29    90    62
   27 |   75    80   144    65    41    81    56
   28 |   54    43    36    67    68    37    38
   01 |   57    43    56    39    53    42    39
   29 |   36    79    56    37    33    36    54
   31 |   52    94    45    53    51    39    37
   07 |   53   108    50    65    45    47    52
   09 |   87   173    92    70   104    72    77
   05 |   66    66    63    36    32    43    66
   04 |   91   117    47    43    91    52    38
   06 |   97    50    47    37    59    45    63

 6. GROUND STATIONS STATISTICS, RESIDUALS RMS OF DOUBLE DIFFERENCE PHASES
    IN <MILLIMETER>, nmeas = NUMBER OF MEASUREMENTS

   \DAY|     149       150       151       152       153       154       155
    \  |
     \ |
  STAT\| nmeas/RMS nmeas/RMS nmeas/RMS nmeas/RMS nmeas/RMS nmeas/RMS nmeas/RMS
  -----|-----------------------------------------------------------------------
  ALGO |  2495/ 12  2550/ 10  2469/ 11  2272/ 11  2314/ 11  2267/ 10  2530/  9
  AREQ |  1906/ 10  1917/  8  1844/  8  1673/  8  1707/  8  1691/  9  1475/  9
  FAIR |   953/ 11   957/ 10   860/ 10   761/ 11   858/ 10   931/ 11  1270/ 10
  GOLD |  1995/  9   970/ 10  1029/ 10   980/ 10   980/ 10  1030/ 10  1251/  9
  HART |   412/ 15   528/ 10   599/ 10   695/ 10   709/ 10   704/ 10   717/ 10
  HOB1 |     0/  0  2126/  8  1992/  9  1125/  8  1827/  8  2325/  8     0/  0
  KIRU |   687/ 13   585/ 11   591/ 11   665/ 11   657/ 11   621/ 12   827/ 11
  KOKB |  1073/ 12    27/ 10   745/ 10  1520/ 10  1767/ 10  1837/ 11  2137/ 10
  KOSG |  1548/  9  1472/  8  1401/  9  1208/  9  1232/ 10  1253/  9  1448/  9
  KOUR |  1163/ 15  1084/ 10  1074/ 11   955/ 12   977/ 12  1099/ 11  1312/ 10
  MADR |  2790/ 10  2867/  9  2890/  9  2465/  9  2451/ 10  2547/ 10  3184/  9
  MASP |  1887/ 11  1785/  9  1763/  9  1597/  9  1720/  9  1753/  9  1949/  9
  MCMU |     0/  0  1302/  9  1776/  9  1624/  8  1601/  9  1534/  9  1982/  8
  PAMA |     0/  0    27/ 12    80/ 13   107/ 11   109/ 11   120/ 12   109/ 11
  PERT |  1846/ 14   944/ 11   900/ 11  1441/ 11  1603/ 10  1623/  9  1873/  9
  PIE1 |  1782/  9     0/  0     0/  0     0/  0     0/  0     0/  0     0/  0
  RCM5 |  1648/ 13  1648/ 10  1675/ 10  1488/ 10  1429/ 11  1463/ 10     0/  0
  SANT |  1993/ 11  2153/  9  2161/  9  1980/  9  2007/ 10  1507/  9   501/  9
  TAIW |  1436/ 12  1818/ 10  1833/ 10  1672/ 10  1770/ 10  1773/ 10  1922/ 10
  TIDB |  1605/ 13  2331/  9  2151/  9  2180/  9  2336/  8  2088/  8  2302/  9
  TROM |   720/ 10   532/ 10   599/ 10   640/  9   618/ 10   591/ 10   910/  9
  TSKB |  2102/ 13  1969/ 10  1993/  9  1864/  9  1954/  9  2023/  9  2171/  9
  USUD |  2368/ 13  2971/ 10  3211/ 10  2987/ 10  2916/ 10  2830/ 10  2845/ 10
  WETT |  1165/ 10  1223/  9   987/  9   573/  9   832/ 10  1136/ 10  1292/  9
  YAR1 |  2430/ 14  1563/ 10  1681/ 10  1944/ 10  1904/ 10  1914/  9  2521/  9
  YELL |   794/ 10   813/  9   788/  9   632/ 10   584/ 10   638/ 10  1060/  9

 7. SATELLITES STATISTICS, RESIDUALS RMS OF DOUBLE DIFFERENCE PHASES
    IN <MILLIMETER>, nmeas = NUMBER OF MEASUREMENTS

   \DAY|     149       150       151       152       153       154       155
    \  |
     \ |
   SAT\| nmeas/RMS nmeas/RMS nmeas/RMS nmeas/RMS nmeas/RMS nmeas/RMS nmeas/RMS
  -----|-----------------------------------------------------------------------
  PRN02|  1547/ 13  1440/ 10  1543/ 10  1508/ 10  1560/ 10  1494/  9  1487/ 10
  PRN12|  1741/ 11  1598/  9  1619/  9  1532/  9  1572/ 10  1562/ 10  1620/  9
  PRN14|  1489/ 13  1406/  9  1359/  9  1301/ 10  1435/ 10  1429/  9  1498/  9
  PRN15|  1737/ 13  1554/ 10  1575/  9  1526/ 10  1589/ 10  1608/ 10  1621/  9
  PRN16|   969/ 12  1591/ 10  1568/ 10  1372/ 10  1427/  9  1466/  9  1438/  9
  PRN17|  1544/ 12  1553/ 10  1700/  9  1561/ 10  1684/ 10  1683/ 10  1528/  9
  PRN18|  1771/ 11  1732/  9  1695/ 10  1649/ 10  1700/ 10  1722/ 10  1813/  9
  PRN19|  1799/ 13  1727/  9  1670/ 10  1605/ 10  1745/ 10  1769/ 10  1682/  9
  PRN20|  1709/ 11  1517/  9  1503/  9  1013/  9   955/ 10  1411/ 10  1630/  9
  PRN21|  1270/ 10  1344/  9  1494/  9  1455/  9  1569/  9  1483/  9  1533/  9
  PRN22|  1635/ 13  1701/ 10  1675/ 10  1489/ 10  1576/ 10  1608/ 10  1574/ 10
  PRN23|  1295/  9  1215/  8  1356/  9  1333/  9  1409/ 10  1409/  9  1400/  9
  PRN24|  1401/ 12  1366/ 10  1392/ 10  1299/ 10  1457/ 10  1495/ 10  1498/ 10
  PRN25|  1394/ 13  1258/ 10  1243/ 11  1200/ 10  1242/ 10  1240/ 10  1213/ 10
  PRN26|  1039/ 11  1154/  9  1270/  9  1225/ 10  1337/  9  1374/  9  1318/  9
  PRN27|  1197/ 13  1161/  9  1119/ 10  1173/ 10  1348/ 10  1402/  9  1430/  9
  PRN28|  1728/ 11  1556/ 10  1634/ 10  1599/ 10  1654/  9  1659/  9  1641/ 10
  PRN01|  1203/ 12  1370/  9  1382/  9  1374/  9  1460/ 10  1372/ 10  1406/  9
  PRN29|  1388/ 12  1326/  9  1350/  9  1276/ 10  1311/  9  1317/  9  1275/  9
  PRN31|  1227/ 11  1190/  9  1260/ 10  1240/ 10  1293/ 10  1261/ 10  1231/ 10
  PRN07|  1432/ 12  1318/ 10  1420/ 10  1389/ 10  1438/ 10  1497/ 10  1440/  9
  PRN09|  1837/ 12  1719/  9  1777/ 10  1611/  9  1577/ 10  1565/ 10  1757/  9
  PRN05|  1591/ 11  1553/ 10  1571/  9  1512/  9  1557/ 10  1540/ 10  1655/ 10
  PRN04|  1312/ 13  1265/ 10  1322/ 10  1248/ 10  1320/  9  1356/  9  1358/ 10
  PRN06|  1543/ 12  1548/ 10  1595/ 10  1558/ 10  1647/ 10  1576/ 10  1542/ 10

 8. PRODUCTS GENERATED:

  The following products are generated and stored in CDDIS at NASA/GSFC:

  ESA0751*.EPH - Precise GPS orbits and clocks, * = day of the week (0-6)
  ESA07517.ERP - Earth rotation results for week 0751 (including DUT1R)
  ESA07517.SUM - This summary file

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