Subject: [IGSREPORT-4247] Wk 0926 COD Analysis Report
From: M. Rothacher
Date: Fri, 17 Oct 1997 7:14:56 PDT

******************************************************************************
IGS Electronic Report    Fri Oct 17  7:14:56 PDT 1997      Message Number 4247
******************************************************************************

Author: M. Rothacher
Subject: Wk 0926 COD Analysis Report

*******************************************************************************
CODE ANALYSIS REPORT GPS WEEK 0926 (DAYS 278-284, DATES 05-10-97 - 11-10-97)
*******************************************************************************
Submitted by: Astronomical Institute, University of Berne, Switzerland
              Products available through anonymous ftp using:
              ftp ubeclu.unibe.ch  -or-  ftp 130.92.6.11
              after login: cd aiub$ftp; cd code
 
FILES SENT TO CDDIS:
-----------------------------------------------------------------------------
COD09267.SUM           THIS TEXT FILE
COD09267.ERP           GPS DAILY EARTH ROTATION ESTIMATES, IGS FORMAT
COD0926N.EPH           GPS DAILY SATELLITE EPHEMERIDES, SP3 FORMAT (N=0..6)
COD09267.SNX_Z         GPS WEEKLY COORDINATE SOLUTION, SINEX FORMAT
-----------------------------------------------------------------------------
COD0926N.TRO           GPS DAILY TROPOSPHERE ESTIMATES, SINEX FORMAT (N=0..6)
                       (SEND TO GFZ ONLY)
-----------------------------------------------------------------------------
 
THREE DAY SOLUTION STATISTICS:
------------------------------------------------------
MIDDLE DAY  FILES  OBSERVATIONS   PARAMETERS  RMS (MM)
------------------------------------------------------
278         266    511825         13429        1.5
279         264    506542         12534        1.5
280         259    499909         11354        1.5
281         265    499464         11908        1.5
282         264    487371         12415        1.5
283         273    495311         13413        1.5
284         281    511630         13247        1.5
------------------------------------------------------
SINEX WEEKLY STATISTIC:
------------------------------------------------------
281        1872   3512052         86869        1.5
------------------------------------------------------
 
 REFERENCE CLOCKS:
 ---------------------------------------------------------
 DAY: 278  NUSN used as reference clock
 DAY: 279  NUSN used as reference clock
 DAY: 280  NUSN used as reference clock
 DAY: 281  NUSN used as reference clock
 DAY: 282  NUSN used as reference clock
 DAY: 283  NALG used as reference clock
 DAY: 284  NALG used as reference clock
 ---------------------------------------------------------
 
 ORBIT REPEATABILITY (CM) FOR PRN: (-- = NOT INCLUDED)
 -------------------------------------------------------------------------------
      1  2  3  4  5  6  7  9E10 13 14 15 16 17 18 19E21 22 23 24 25E26 27E29 30 31 
 -------------------------------------------------------------------------------
 278  6  5  5  5  4  4  4 10  4  6 14  5 66  6 31  7  7  5 10  4  4  4  7497  5  4
 279  4  4  4  4  4  3  3  5  5  4  9 10134  6 33  6  3  3  7  2  2  3  4170  4  3
 280  5  4  4  4  3  3  3  5  4  5  7  4 58  6 24  6  6  4 10  3  4  3  4137  4  3
 281  5  5  4  5  4  3  4  6  4  5 12  8 68  9 33  6  4  4  9  4  4  4  4113  5  3
 282  4  5  3  4  4  3  3  5  3  5 19  7 31  5 42  4  4  5 12  3  3  3  4 66  5  3
 283  5  4  3  3  3  3  4  4  4  4 23  8 57  6 57  6  6  4  9  3  4  3  3101  4  3
 284  5  7  4  5  5  3  5  5  5  6 58  7 46  7178  7  6  6 10  4  6  5  5 99  6  4
 -------------------------------------------------------------------------------
 ALL  5  5  4  4  4  3  4  6  4  5 26  7 73  7 76  6  5  5 10  3  4  4  5218  4  3
 -------------------------------------------------------------------------------

  WEEKLY COORDINATE COMPARISON OF 1-DAY (G1) SOLUTIONS  
 -------------------------------------------------------------------------------
 TOTAL NUMBER OF STATIONS:    84
 -------------------------------------------------------------------------------
                       WEEKDAY  RESIDUAL RMS IN MM
 STATION        #DAYS  0123456     N     E     U
 -------------------------------------------------------------------------------
 ALBH 40129M003     7  PPPPPPP     3     4     4
 ALGO 40104M002     7  PPPPPPP     -     -     -   FIXED
 ANKR 20805M002     4  PP PP       5     4     4
 AREQ 42202M005B    7  PPPPPPP     7    15    11
 ASC1               7  PPPPPPP     7    19    30
 AUCK 50209M001     7  PPPPPPP     5     3    13
 BAHR 249010M02     7  PPPPPPP     7     8    10
 BOR1 12205M002     7  PPPPPPP     2     4     7
 BRAZ 41606M001     5  PPP P P    10    17    11
 BRUS 13101M004     7  PPPPPPP     2     4     5
 CHAT 50207M001     7  PPPPPPP     7     5     8
 CHUR               7  PPPPPPP     2     2     7
 COCO               1        P     -     -     -
 CRO1 43201M001     7  PPPPPPP     5     8     8
 DGAR               2  P     P    14     4    32
 DRAO 40105M002     7  PPPPPPP     3     3     5
 ELAT               7  PPPPPPP     6     6    15
 FAIR 40408M001B    7  PPPPPPP     -     -     -   FIXED
 FLIN          B    7  PPPPPPP     2     3     8
 FORT 41602M001     7  PPPPPPP     8    13    16
 GODE 40451M123     7  PPPPPPP     2     2     7
 GOLD 40405S031     7  PPPPPPP     -     -     -   FIXED
 GOPE 11502M002     5  P  PPPP     2     4     3
 GRAS 10002M006B    6  P PPPPP     2     3     4
 GRAZ 11001M002B    7  PPPPPPP     2     3     5
 GUAM 50501M002     7  PPPPPPP     9    18    17
 HOB2 50116M004     1        P     -     -     -
 IISC 22306M001B    4  P   PPP    10    10    20
 IRKT 12313M001     6  PPPPP P     9    12     6
 JOZE 12204M001     7  PPPPPPP     2     4     6
 KATZ               6  PPPP PP     6     6    10
 KERG 91201M002     6  PPP PPP     9    17    21
 KIRU 10403M002     7  PPPPPPP     2     2     5
 KIT3 12334M001     6  PP PPPP    10    10     6
 KOKB 40424M004     7  PPPPPPP     -     -     -   FIXED
 KOSG 13504M003     7  PPPPPPP     -     -     -   FIXED
 KOUR 97301M210B    5    PPPPP     3     2    10
 KSTU 12349M002     6  PPPPP P    10    12     7
 KWJ1               7  PPPPPPP    10    10    31
 LAMA 12209M001     6   PPPPPP     2     3     8
 LHAS 21613M001     7  PPPPPPP    10     9     9
 LPGS 41510M001     7  PPPPPPP     8    12    14
 MALI 33201M001     7  PPPPPPP     8     9    20
 MASP 31303M002C    7  PPPPPPP     4     5    15
 MATE 12734M008B    7  PPPPPPP     2     4     9
 MCM4 66001M003     7  PPPPPPP    11    10    16
 MDO1 40442M012     7  PPPPPPP     3     6    10
 MDVO 12309M002     7  PPPPPPP     4     6    15
 METS 10503S011     7  PPPPPPP     3     4     8
 MKEA               7  PPPPPPP     2     6     9
 MONP 40497M004     7  PPPPPPP     4     5     3
 NICO 14302M001     6  PPPPP P     5     3     6
 NLIB 40465M001     7  PPPPPPP     1     3     6
 NTUS 22601M001     4  PP   PP    16    12    11
 ONSA 10402M004     5  PPP PP      2     4     8
 PERT 50133M001     7  PPPPPPP     3    11     8
 PIE1 40456M001     7  PPPPPPP     2     4    12
 POL2 12348M001     4  P PP  P     7     9     8
 POTS 14106M003     7  PPPPPPP     1     3     5
 REYK 10202M001     7  PPPPPPP     2     4     9
 RICH 40499S018C    7  PPPPPPP     5     7    19
 SANT 41705M003B    5    PPPPP     -     -     -   FIXED
 SHAO 21605M002     3     P PP     5    14     4
 STJO 40101M001B    7  PPPPPPP     1     5     9
 TAEJ 23902M001B    7  PPPPPPP     7    10    11
 TAHI 92201M006     6  P PPPPP     5    16     9
 TAIW 23601M001     2     P  P     4    16     5
 TELA               7  PPPPPPP     6     5    10
 THU1 43001M001     7  PPPPPPP     3     2     5
 TIDB 50103M108C    7  PPPPPPP     -     -     -   FIXED
 TSKB 21730S005     7  PPPPPPP     8     9    13
 UPAD 12750M002     4  PPPP        2     2     3
 USNO 40451S003     7  PPPPPPP     1     2    11
 USUD 21729S007     7  PPPPPPP     8    11    20
 VILL 13406M001     7  PPPPPPP     2     3    11
 WES2 40440S020     7  PPPPPPP     2     4     4
 WHIT               7  PPPPPPP     2     2     5
 WSRT 13506M005     7  PPPPPPP     2     1     3
 WTZR 14201M010     7  PPPPPPP     -     -     -   FIXED
 WUHN 21602M001     7  PPPPPPP    11    11     7
 XIAN               7  PPPPPPP    10    10     7
 YAR1 50107M004B    6  PPP PPP     3    11     8
 YELL 40127M003B    7  PPPPPPP     -     -     -   FIXED
 ZIMM 14001M004     7  PPPPPPP     2     5     6
 -------------------------------------------------------------------------------
 # Coordinate Estimates:   464     5     8    11

 REMARKS: Day 278: Modeling problems for PRN  29

          Day 279: Modeling problems for PRNs 14, 29

          Day 280: Modeling problems for PRN  16

          Day 284: Modeling problems for PRNs 14, 18

Processing changes (last changes week 0873, see IGSREPORT.3056)
===============================================================

Starting with GPS week 0926 the CODE Analysis Center has made essential
changes to its routine processing:

 1) The elevation cut-off was changed from 20 to 10 degrees.

 2) An elevation-dependent weighting of the observations is applied 
    (1/cos(zenith)**2).

 3) The Niell mapping function (dry) is used to map the tropospheric 
    zenith delays 

 4) We adopted the solid Earth tide model as given in the IERS 1996 
    conventions. Only ocean loading is not yet applied.

Observed changes in the orbit and EOPs
--------------------------------------
        orbit            EOPs
 -----------------------------------
 rot x.  0.03 mas   x:   0.06 mas 
 rot y. -0.07 mas   y:   0.02 mas
 rot z. -0.01 mas   ut:  0.01 us/day
 tra z.     3 mm
 -----------------------------------

From the above table we conclude that there are no significant systematic
changes in both our orbit and EOP estimates.

For the station coordinates we see the following relatively large changes:
  - scale decreased by 0.8 ppb. This is caused mainly by the change of the
    tropospheric mapping function. 
    It must be noted that the change in cut-off elevation (20 to 10 degrees) 
    changes the scale significantly but the elevation-dependent weighting 
    counteracts this effect.

  - repeatability of the coordinates improves significantly,
    especially the height component.

  - Unfortunately some station coordinates will show a jump in our time-series!
    This is, in our opinion, mainly caused by multipath and antenna phase
    center variations. This means that those stations for which we see a 
    jump are probably in a bad multipath environment or have a very different
    antenna setup. For the following stations we see a systematic
    change in the coordinates larger than 15 mm (the values in brackets are
    the observed systematic height changes):
     MDVO (+30), TAIW (-20), IRKT (+25), MCMU (-20)

    It should be noted that MDVO has a "special" antenna without a ground
    plane. So it is very likely to have strong multipath effects. Furthermore
    we have no antenna phase center variations for this antenna which will
    cause a bias as well.
 
See IGSMAIL.1705 for more information about these changes!

Note that the "RMS" values as given in our weekly summary reports
now refer to the noise of a "one-way L1 phase observation (at zenith)"

global: ALBH ALGO ANKR AREQ ASC1 AUCK BOR1 BOGT BRAZ BRMU BRUS CAS1 CHAT CRO1
global: DAV1 DRAO EISL FAIR FORT GODE GOLD GOPE GRAS GRAZ GUAM HART HRAO HOB2
global: IISC IRKT JOZE KERG KIT3 KOKB KOSG KWJ1 LAMA LHAS LPGS MAC1 MALI MAS1
global: MATE MCM4 MDO1 MDVO METS MOIN MONP NYAL NLIB OHIG ONSA PAMA PERT PIE1
global: POL2 POTS QUIN RCM5 REYK SANT SEY1 SHAO STJO TAHI TAIW TIDB TAEJ THU1
global: TSKB UPAD USUD WTZR YAR1 YELL WES2 ZIMM COCO CHUR FLIN WHIT BAHR WUHN
global: MKEA DGAR XIAN VILL ZWEN KSTU WSRT USNO NTUS KIRU NICO KOUR

[Mailed From: MARKUS ROTHACHER <[email-masked]>]