From sinex at geod.nrcan.gc.ca Wed Sep 9 18:14:14 2009 From: sinex at geod.nrcan.gc.ca (IGS SINEX) Date: Wed, 9 Sep 2009 21:14:14 -0400 Subject: [IGSREPORT-17780] Wk 1546 IGS SINEX Combination Message-ID: <200909100114.n8A1EECC018266@newton.geod.nrcan.gc.ca> ****************************************************************************** IGS Electronic Report 09 Sep 18:14:41 PDT 2009 Message Number 17780 ****************************************************************************** Author: R. Ferland, M. Piraszewski =============================================================== Combined AC solution for GPS week 1546 - 09/08/23 to 09/08/29 =============================================================== 1) Contacts: ============ e-mail: rferland at nrcan.gc.ca Tel: (613)995-4002 (Remi Ferland) Fax: (613)995-3215 2) Products: ============ All products are available at: CDDIS (cddis.gsfc.nasa.gov) and SOPAC (garner.ucsd.edu) igs09P1546.snx Combined weekly solution. igs09P1546.erp Daily Earth Rotation Parameters. igs00p03.erp Daily Earth Rotation Parameters since GPS week 860. IGS09P34.snx Cumulative Combined solution. igs09P1546.sum This file. igs09P1546.itr Residuals between the AC and the IGS05 for the RF stations. igs09P1546.res Residuals between the AC and the Combined Weekly solution. IGS09P34.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 IGS05 stations at the current epoch. ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS05.snx 3-4) The AC are compared to IGS05, 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 IGS05 of the current epoch using a 7-parameters transformation. The singular cumulative combined solution is aligned to the IGS05 of the reference epoch using a 14-parameters transformation and the 132 ITRF station positions and velocities. The IGS05 is a realization of ITRF2005. 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 = IGS05.snx igs = igs09P1546.snx IGS = IGS09P34.snx MIT = mit15467.snx mit = mit1546g.snx BuA = IERS Bulletin A grg mit ncl are used to quality control the weekly combination. gfz excluded from the geocenter estimation (Sec. 5-4). Solutions with manual station deletion: From the original solution: cod SATA X Y Z emr SATA X Y Z esa SATA X Y Z gfz SATA X Y Z MIT SATA X Y Z sio SATA X Y Z mit SATA X Y Z After unconstraining: grg AREQ FAIR NOVM YKRO emr BHR1 gfz BHR1 MIT BHR1 ngs BHR1 sio OUSD New stations in the cumulative solution IGS09P34.snx FAIV A 1 RCMV A 1 TABL A 1 4-1) Starting with GPS week 1400, the solutions are aligned to the IGS05.snx realization of ITRF2005. 4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A is included in the erp files. 4-3) Starting with GPS week 1412, the accumulated ERP file has been changed from "igs00p02.erp" to "igs00p03.erp". The main changes are: 1) Correction of the pole position from IGb00 to IGS05 using the transformation in: http://igscb.jpl.nasa.gov/mail/igsmail/2006/msg00178.html 2) Marginal ERP's in GPS week 1161 were replaced by reprocessed values. 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 | 219 | 65 | 18.366 | 1.000 | 18.365 | emr | 76 | 34 | 4.807 | 1.000 | 4.807 | esa | 133 | 42 | 4.543 | 1.000 | 4.543 | gfz | 183 | 63 | 12.606 | 1.000 | 12.605 | jpl | 125 | 49 | 8.132 | 1.000 | 8.132 | MIT | 250 | 72 | 2.090 | 1.000 | 2.090 | ngs | 220 | 69 | 26.308 | 1.000 | 26.308 | sio | 252 | 70 | 1.680 | 1.000 | 1.680 | grg | 108 | 42 | 15.818 | 1.000 | 15.818 | mit | 402 | 69 | 1.803 | 1.000 | 1.803 | ncl | 215 | 72 | 2.310 | 1.000 | 2.310 | igs | 350 | 72 | 1.616 | 0.999 | 1.615 | ---------------|-----|-----|---------------|---------------|---------------| 5-2) Solution Residuals weighted Average & STD: ==================================================== 5-2-1) With respect to the IGS05 stations: ============================================= Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 65 | 1.2 0.1 0.1 | 2.6 3.3 7.7 | emr 34 | 0.4 0.0 0.3 | 3.4 4.3 9.0 | esa 42 | 0.3 -0.1 0.6 | 3.1 4.1 8.3 | gfz 63 | 0.6 0.1 0.0 | 2.7 3.3 8.3 | jpl 49 | 0.8 0.1 0.0 | 2.4 3.1 9.1 | MIT 72 | 1.3 0.1 0.2 | 2.5 3.4 8.1 | ngs 69 | 1.8 0.1 0.1 | 2.4 3.5 8.3 | sio 70 | 0.9 0.0 0.2 | 2.9 3.4 7.1 | grg 42 | 1.1 0.1 -0.1 | 2.5 1.3 6.0 | mit 68 | 0.8 0.1 0.0 | 2.4 3.3 7.5 | ncl 72 | 1.3 0.1 -0.1 | 2.6 3.2 7.9 | ---------------|---------------------------|---------------------------| 5-2-2) With respect to the Weekly Combination: ================================================= Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 206 | 0.1 0.1 0.8 | 0.8 0.6 2.3 | emr 74 | -0.8 0.0 -1.0 | 1.9 1.8 5.8 | esa 124 | -0.7 0.0 0.1 | 2.0 1.9 3.6 | gfz 180 | -0.4 0.2 -0.4 | 0.7 0.7 2.6 | jpl 122 | -0.1 -0.5 -0.2 | 1.2 2.6 5.0 | MIT 223 | 0.1 0.2 0.2 | 0.7 0.7 2.0 | ngs 208 | 0.7 0.2 -0.1 | 0.8 1.1 2.1 | sio 245 | 0.1 0.0 0.0 | 1.1 0.7 2.6 | grg 106 | -0.2 -0.3 -0.3 | 2.6 4.4 8.6 | mit 345 | -0.2 0.0 0.1 | 0.2 0.2 1.0 | ncl 208 | 0.1 0.1 0.0 | 0.7 0.7 1.3 | ITR 71 | -0.9 -0.3 0.1 | 2.2 3.1 7.1 | ---------------|---------------------------|---------------------------| 5-2-3) With respect to the Cumulative Combination: ===================================================== Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 172 | 0.1 0.2 0.6 | 1.5 1.5 4.4 | emr 73 | -1.0 0.2 -0.5 | 2.7 2.4 7.2 | esa 102 | -0.8 0.1 0.5 | 2.5 2.2 5.0 | gfz 162 | -0.5 0.5 -0.1 | 1.6 1.5 4.4 | jpl 118 | -0.1 -0.2 0.1 | 2.0 2.9 6.4 | MIT 191 | 0.3 0.4 0.3 | 1.5 1.5 4.3 | ngs 170 | 0.7 0.4 -0.4 | 1.6 1.9 4.3 | sio 203 | 0.2 0.2 -0.2 | 2.0 1.4 4.3 | grg 102 | -0.2 -0.3 -0.8 | 2.6 4.0 8.2 | mit 242 | -0.1 0.2 -0.1 | 1.4 1.4 3.5 | ncl 194 | 0.2 0.3 -0.1 | 1.6 1.5 4.0 | igs 245 | 0.1 0.2 -0.1 | 1.4 1.3 3.5 | ITR 115 | -0.8 -0.1 -0.2 | 2.5 2.7 9.7 | ---------------|---------------------------|---------------------------| 5-3) 7-Parameters Transformation: AC ----> IGS05.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 | -0.010 0.001 -0.012 0.1 0.5 1.2 -0.41 | emr | 0.122 -0.053 0.099 10.8 -3.7 -2.7 -0.07 | esa | 0.003 -0.051 0.045 4.2 -2.0 2.2 -0.16 | gfz | 0.013 -0.014 -0.001 0.0 0.7 1.3 -0.30 | jpl | 0.013 -0.008 0.014 -0.6 0.1 -1.1 0.04 | MIT | 0.012 0.002 -0.018 3.7 -5.9 12.3 -0.37 | ngs | -0.012 -0.041 -0.011 5.5 -2.2 4.9 -0.28 | sio | -0.115 -0.041 -0.009 0.4 -5.6 -6.8 0.02 | grg | -0.015 0.004 0.016 4.0 0.5 4.0 0.11 | mit | -0.001 0.017 -0.007 -1.3 0.7 0.0 -0.24 | ncl | 0.014 0.004 0.003 -0.3 0.7 0.8 -0.30 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 -0.20 | ---------------|---------------------------------------------------------------| 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 | 0.049 0.051 0.055 1.3 1.3 1.3 0.20 | emr | 0.065 0.071 0.072 1.7 1.7 1.7 0.27 | esa | 0.059 0.065 0.068 1.6 1.6 1.6 0.25 | gfz | 0.050 0.051 0.055 1.3 1.3 1.3 0.20 | jpl | 0.056 0.057 0.064 1.5 1.5 1.5 0.23 | MIT | 0.048 0.049 0.052 1.3 1.3 1.2 0.19 | ngs | 0.049 0.050 0.053 1.3 1.3 1.3 0.20 | sio | 0.048 0.050 0.052 1.3 1.3 1.3 0.20 | grg | 0.061 0.062 0.071 1.6 1.6 1.6 0.25 | mit | 0.048 0.049 0.053 1.3 1.3 1.3 0.20 | ncl | 0.048 0.049 0.052 1.3 1.3 1.2 0.19 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.17 | ---------------|---------------------------------------------------------------| 5-4) Geocenter: ==================== | X Y Z | s X s Y s Z | | (mm) (mm) (mm) | (mm) (mm) (mm) | ---------------|---------------------------|---------------------------| igs | 2.9 -2.6 3.3 | 1.0 0.8 2.1 | ---------------|---------------------------|---------------------------| 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 | --- --- --- --- --- --- | emr | --- 4.3 4.2 24.5 1.4 -4.0 | esa | --- -3.5 1.2 7.3 -0.9 7.7 | gfz | --- -3.6 1.9 4.7 -0.4 3.6 | jpl | --- 20.9 -18.6 4.9 -0.1 -2.5 | MIT | --- 0.8 -0.5 -16.6 0.3 -7.5 | ngs | --- 1.6 -2.9 7.8 1.6 8.3 | sio | --- 7.7 1.1 --- 0.1 --- | grg | --- -7.4 -1.6 -5.8 -2.6 6.0 | mit | --- 22.6 0.0 15.6 -1.0 0.0 | ncl | --- --- --- --- --- --- | ITR | --- --- --- --- --- --- | BuA | --- -7.6 0.4 -2.9 0.2 1.9 | ---------------|------------------------------------------------------------| 5-5-2) STD: ============== Solution | UT LOD XPO XPOR YPO YPOR | | us us .01mas .01ma/d .01mas .01ma/d | ---------------|------------------------------------------------------------| cod | --- --- --- --- --- --- | emr | --- 16.2 1.5 16.6 1.6 4.9 | esa | --- 15.3 1.7 10.6 1.4 7.8 | gfz | --- 7.3 1.7 9.7 0.9 4.5 | jpl | --- 15.7 5.0 5.9 3.1 11.5 | MIT | --- 2.0 0.8 6.0 1.0 7.1 | ngs | --- 16.4 3.0 6.6 4.0 10.2 | sio | --- 5.6 0.5 --- 0.9 --- | grg | --- 20.6 2.2 7.9 2.4 10.6 | mit | --- 7.0 0.4 8.6 0.9 6.2 | ncl | --- --- --- --- --- --- | ITR | --- --- --- --- --- --- | BuA | --- 15.6 2.7 9.4 1.7 10.5 | ---------------|------------------------------------------------------------| 5-6) Satellite Antenna Offset Residuals weighted Average & STD: ==================================================================== No Satellite phase center ... 5-7) Outliers: =================== Thresholds set at 5 sigmas and 50 mm. Solution Solution | Station | N E U | Minus |code id soln| (mm) (mm) (mm)| -----------------------------------------|------------|-----------------------| | | | ITRF_IGS05.snx esa15467.snx |HOB2 A 2| 12.5 -0.8 17.1| | | | ITRF_IGS05.snx gfz15467.snx |NLIB A 2| 11.2 0.5 3.2| ITRF_IGS05.snx gfz15467.snx |POLV A 1| 2.3 -0.8 -25.2| | | | ITRF_IGS05.snx ngs15467.snx |NLIB A 2| 13.2 1.2 -0.8| | | | ITRF_IGS05.snx mit1546g.snx |NLIB A 2| 9.5 -0.2 1.0| | | | IGS09P33.snx cod15467.snx |POVE A 1| 1.6 2.2 -26.6| | | | IGS09P33.snx sio15467.snx |SJDV A 1| 3.6 32.2 22.4| | | | IGS09P33.snx mit1546g.snx |SJDV A 1| 3.2 33.0 23.9| | | | IGS09P33.snx mit1546g.snx |POVE A 1| 1.2 2.5 -27.1| IGS09P33.snx mit1546g.snx |WUHN A 4| -9.1 -2.6 -3.0| | | | IGS09P33.snx igs09P1546.snx |NLIB A 2| 8.0 -1.9 -7.1| IGS09P33.snx igs09P1546.snx |SALU A 1| -7.1 -3.6 -10.9| IGS09P33.snx igs09P1546.snx |UNSA A 1| -2.5 6.2 -0.5| -----------------------------------------|------------|-----------------------|