From ferland at geod.nrcan.gc.ca Thu Nov 13 13:16:18 2003 From: ferland at geod.nrcan.gc.ca (Remi Ferland) Date: Thu, 13 Nov 2003 16:16:18 EST Subject: [IGSREPORT-10772] Wk 1242 IGS SINEX Combination Message-ID: <200311132116.QAA14414@newton.geod.nrcan.gc.ca> ****************************************************************************** IGS Electronic Report 13 Nov 13:16:23 PST 2003 Message Number 10772 ****************************************************************************** Author: R. Ferland , D. Hutchison =================================================================== Combined AC solution for GPS week 1242 - 03/10/26 to 03/11/01 =================================================================== 1) Contacts: ============ e-mail: ferland at geod.nrcan.gc.ca Tel: (613)995-4002 (Remi Ferland) Fax: (613)995-3215 2) Products: ============ All products are available at cddisa.gsfc.nasa.gov igs03P1242.snx Combined weekly solution. igs03P1242.erp Daily Earth Rotation Parameters. igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013. IGS03P44.snx Cumulative Combined solution. igs03P1242.sum This file. igs03P1242.itr Residuals between the AC and the IGS00 for the RF stations. igs03P1242.res Residuals between the AC and the Combined Weekly solution. IGS03P44.res Residuals between the AC and the Cumulative Combined solution. Where IGSyyPww & igsyyPwwww represent: yy Last 2 digits of the year ww week in year yy wwww GPS week P GPS technique used 3) Combination Strategy: ======================== The AC solutions are processed using the following procedure: 3-1) The AC solutions are checked/corrected for possible format problems, station names inconsistencies, etc... 3-2) The AC solutions are unconstrained according to the information provided in the SOLUTION/APRIORI Block. 3-3) The AC solutions are aligned (using a 7-parameters) and compared to the IGS00 stations at the current epoch. ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS01P37_RS54.SNX.Z 3-4) The AC are compared to IGS00, to each other, to the previous week solution and to the cumulative solution in order to identify and remove outliers. 3-5) The weekly AC solutions are combined and added to the cumulative combined solution. The cumulative combination is done to ensures 14 parameters singularity. The weekly combined solution is aligned to the IGS00 of the current epoch using a 7-parameters transformation. The singular cumulative combined solution is aligned to the IGS00 of the reference epoch using a 14-parameters transformation and the 54 ITRF station positions and velocities. The IGS00 is a realization of ITRF2000. For more details, see: Blewitt, G., C. Boucher and J. Kouba, 1997, Procedure for ITRF continuous realization, the report of the IGS GB, presented to the IGS Governing Board Meeting held in San Francisco, Dec. 11. Kouba, J., J. Ray and M.M. Watkins, IGS Reference Frame Realization, 1998 IGS Analysis Center Workshop Proceedings, European Space Operations Centre, Darmstadt, Germany. The combination software was developed at NRCan. 4) Remarks: =========== ITR = IGS01P37_RS54.SNX igs = igs03P1242.snx IGS = IGS03P44.snx BuA = IERS Bulletin A mit ncl are used to quality control the weekly combination. gfz excluded from the geocenter estimation (Sec. 5-4). Solutions with manual station deletion: After unconstraining: esa RIOG SANT ngs KOKB mit TALA TNML 4-1) Starting with GPS week 1143, the solutions are aligned to the IGS01P37_RS54.SNX realization of ITRF2000. 4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A is included in the erp files. 5) Results: =========== 5-1) AC (Variance Factor)^0.5 estimates: ================================================== The residuals used in the estimation of the Variance Factor are the differences between the cumulative combined solution and each AC weekly solution. SF = (Variance Factor)^0.5 = (Chi^2/dof)^0.5 Final(SF) = Apriori(SF) * Aposteriori(SF) Solution |# sta| #RF | Apriori(SF)|Aposteriori(SF)| Final(SF)| ---------------|-----|-----|---------------|---------------|---------------| cod | 167 | 37 | 27.067 | 1.000 | 27.081 | emr | 45 | 25 | 3.747 | 1.001 | 3.749 | gfz | 182 | 43 | 8.303 | 1.001 | 8.309 | jpl | 115 | 30 | 4.654 | 1.001 | 4.657 | ngs | 80 | 43 | 23.405 | 1.001 | 23.429 | sio | 178 | 44 | 1.827 | 1.001 | 1.828 | mit | 259 | 43 | 1.437 | 1.122 | 1.612 | ncl | 147 | 42 | 1.813 | 1.036 | 1.878 | igs | 234 | 45 | 1.357 | 1.000 | 1.357 | ---------------|-----|-----|---------------|---------------|---------------| 5-2) Solution Residuals weighted Average & STD : ===================================================== 5-2-1) With respect to the IGS00 stations: ============================================= Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 37 | 1.3 0.8 -1.1 | 3.9 4.4 15.1 | emr 25 | -0.0 0.4 0.9 | 3.7 3.0 9.5 | gfz 43 | 0.3 0.7 -0.1 | 3.8 3.8 9.6 | jpl 30 | 0.3 0.2 -0.0 | 3.6 3.3 9.7 | ngs 43 | -2.0 0.9 -0.7 | 5.1 6.7 11.3 | sio 44 | 0.5 0.7 -0.5 | 3.8 3.7 6.4 | mit 43 | 1.1 0.9 -0.3 | 3.6 3.4 8.0 | ncl 42 | 0.7 0.7 -0.2 | 3.5 3.6 7.5 | ---------------|---------------------------|---------------------------| 5-2-2) With respect to the Weekly Combination: ================================================= Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 166 | 0.9 0.2 -1.0 | 1.4 1.6 7.6 | emr 45 | -0.4 -0.5 -1.8 | 2.0 1.9 6.3 | gfz 180 | -0.4 0.1 -0.6 | 1.1 0.9 4.6 | jpl 114 | -0.5 -0.1 0.3 | 1.4 1.3 6.5 | ngs 80 | -2.6 -0.1 0.8 | 2.7 6.2 11.2 | sio 167 | -0.1 -0.1 0.2 | 1.5 2.3 4.9 | mit 225 | 0.3 -0.2 -0.2 | 1.3 1.2 3.1 | ncl 146 | -0.2 -0.0 -0.3 | 0.5 0.5 2.5 | ITR 44 | -0.7 -1.1 0.1 | 3.7 3.2 7.4 | ---------------|---------------------------|---------------------------| 5-2-3) With respect to the Cumulative Combination: ===================================================== Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 140 | 1.4 0.1 -2.0 | 2.8 2.5 12.7 | emr 43 | -0.3 -0.5 -2.2 | 2.2 2.0 8.4 | gfz 167 | -0.1 0.1 -0.4 | 2.2 1.7 7.9 | jpl 102 | 0.2 -0.2 -0.0 | 2.5 2.0 9.5 | ngs 79 | -2.0 -0.2 -0.3 | 3.6 6.3 11.8 | sio 155 | 0.3 -0.0 -0.4 | 2.6 3.0 6.6 | mit 184 | 0.7 -0.0 -0.9 | 2.4 2.2 6.4 | ncl 140 | 0.4 -0.1 -1.0 | 2.1 1.6 6.5 | igs 189 | 0.3 0.1 -0.5 | 1.8 1.6 6.5 | ITR 54 | -0.7 -0.7 0.2 | 2.8 2.4 4.6 | ---------------|---------------------------|---------------------------| 5-3) 7-Parameters Transformation: AC ----> IGS01P37_RS54.snx ================================================================= 5-3-1) Estimates : ===================== Solution | R X R Y R Z T X T Y T Z SCL | | (mas) (mas) (mas) (mm) (mm) (mm) (ppb) | ---------------|---------------------------------------------------------------| cod | 0.006 -0.012 -0.036 7.6 12.5 -4.6 1.43 | emr | 0.019 0.030 -0.042 -1.4 8.6 -7.6 2.85 | gfz | 0.046 -0.044 0.025 -1.2 1.6 -2.3 1.05 | jpl | 0.001 0.004 0.023 -0.5 8.8 -7.0 0.34 | ngs | 0.037 -0.160 -0.013 7.1 5.1 -9.7 0.54 | sio | 0.018 -0.082 0.048 8.0 -0.6 34.4 1.56 | mit | 0.029 -0.022 -0.004 0.1 -0.1 -1.4 1.64 | ncl | -0.024 -0.055 -0.057 0.9 0.4 -4.0 1.32 | ---------------|---------------------------------------------------------------| 5-3-2) STD : =============== Solution | R X R Y R Z T X T Y T Z SCL | | (mas) (mas) (mas) (mm) (mm) (mm) (ppb) | ---------------|---------------------------------------------------------------| cod | 0.065 0.066 0.073 1.7 1.7 1.7 0.26 | emr | 0.080 0.078 0.092 2.0 2.0 2.0 0.32 | gfz | 0.059 0.061 0.068 1.6 1.6 1.6 0.24 | jpl | 0.072 0.072 0.082 1.9 1.9 1.9 0.29 | ngs | 0.060 0.060 0.069 1.6 1.6 1.6 0.24 | sio | 0.058 0.060 0.068 1.5 1.5 1.5 0.24 | mit | 0.059 0.061 0.069 1.6 1.6 1.6 0.24 | ncl | 0.060 0.061 0.069 1.6 1.6 1.6 0.25 | ---------------|---------------------------------------------------------------| 5-4) Geocenter: ==================== | X Y Z | s X s Y s Z | | (mm) (mm) (mm) | (mm) (mm) (mm) | ---------------|---------------------------|---------------------------| igs | 4.1 3.9 -5.9 | 1.8 2.0 4.2 | ---------------|---------------------------|---------------------------| 5-5) ERP Residuals Weighted Average & STD : ================================================ 5-5-1) Weighted Average : ============================ Solution | UT LOD XPO XPOR YPO YPOR | | us us .01mas .01ma/d .01mas .01ma/d | ---------------|------------------------------------------------------------| cod | --- -6.5 -0.6 --- -1.2 --- | emr | --- -7.2 -0.1 17.4 -5.6 -18.9 | gfz | --- 11.0 -0.1 2.8 0.4 -5.6 | jpl | --- -34.6 -2.7 -15.5 -0.8 -5.2 | ngs | --- -36.1 -3.2 -23.4 20.1 28.8 | sio | --- -5.3 2.8 1.1 0.7 3.3 | mit | --- 41.0 -0.0 2.1 4.2 1.3 | ncl | --- 15.7 5.2 --- 0.9 --- | ITR | --- --- --- --- --- --- | BuA | --- -3.7 -9.0 -0.5 23.5 5.5 | ---------------|------------------------------------------------------------| 5-5-2) STD : =============== Solution | UT LOD XPO XPOR YPO YPOR | | us us .01mas .01ma/d .01mas .01ma/d | ---------------|------------------------------------------------------------| cod | --- 6.3 1.5 --- 1.9 --- | emr | --- 11.1 3.6 8.3 1.8 13.2 | gfz | --- 5.5 1.1 4.4 1.4 7.0 | jpl | --- 64.5 2.8 19.2 4.3 11.0 | ngs | --- 58.7 6.2 49.9 11.1 46.1 | sio | --- 11.1 2.8 8.9 3.7 3.5 | mit | --- 7.5 2.9 10.7 10.1 5.5 | ncl | --- 1.8 0.5 --- 0.8 --- | ITR | --- --- --- --- --- --- | BuA | --- 16.6 7.5 11.3 4.0 7.4 | ---------------|------------------------------------------------------------| 5-6) Outliers: =================== Thresholds set at 5 sigmas and 50 mm. Solution Solution | Station | N E U | Minus |code id soln| (mm) (mm) (mm)| -----------------------------------------|------------|-----------------------| | | | IGS01P37_RS54.snx jpl12427.snx |YAR1 A ----| -1.8 4.3 -59.3| | | | cod12427.snx jpl12427.snx |DWH1 A ----| 1.2 -0.6 -55.3| | | | igs03P1241.snx jpl12427.snx |OHI3 A ----| 10.8 -13.8 -59.0| | | | igs03P1241.snx mit1242g.snx |OHI3 A ----| 15.2 -12.0 -67.5| | | | IGS03P43.snx gfz12427.snx |YSSK A ----| 12.9 -6.0 -6.6| | | | IGS03P43.snx jpl12427.snx |USN1 A ----| -1.4 0.2 78.2| | | | IGS03P43.snx igs03P1242.snx |YSSK A ----| 12.8 -4.0 -3.4| -----------------------------------------|------------|-----------------------| 5-7) Conflicts: ==================== IERS DOMES NO cod emr gfz jpl ngs sio IGS igs ============= ====== ====== ====== ====== ====== ====== ====== ====== 40405S031 GOLD A GOLD A GOL2 A GOL2 A GOLD A GOLD A 22306M002 IISC A IISC A IISC A IISC A IISC B IISC A IISC A IISC A 10422M001 KIR0 A KR0G A 43001M002 THU2 A THU3 A THU2 A THU3 A THU2 A THU3 A THU2 A THU3 A THU3 A 50103M108 TIDB A TIDB A TIDB A TID2 A TIDB A TIDB A TIDB A TID2 A TID2 A 50107M004 YAR2 A YAR2 A YAR2 A YAR2 A YAR2 A YAR1 A YAR2 A YAR2 A 13407S012 MADR A MAD2 A MAD2 A MADR A MADR A 49928S001 EPRT A EPRT A EPRT A EPRT A MISSING IERS DOMES NOS AT gfz: ----------------------------- BISH A PALM A MISSING IERS DOMES NOS AT sio: ----------------------------- PUR2 A CONZ A SG21 A OUSD A CNCL A KARA A MERS A CAVA A SFEL A VOLT A BRAS A IERS DOMES NO mit ncl IGS igs ============= ====== ====== ====== ====== 13407S012 MAD2 A MADR A MADR A MADR A 43001M002 THU2 A THU2 A THU3 A THU2 A THU3 A THU3 A THU3 A 40405S031 GOLD A GOLD A GOLD A GOL2 A 50103M108 TIDB A TID2 A TIDB A TIDB A TID2 A TIDB A TID1 A 50107M004 YAR2 A YAR2 A YAR1 A YAR2 A YAR2 A 10422M001 KIR0 A KR0G A 11206M006 PENC A PENC A PENC A MISSING IERS DOMES NOS AT mit: ----------------------------- BISH A --