From sinex at geod.nrcan.gc.ca Wed Sep 10 17:35:25 2008 From: sinex at geod.nrcan.gc.ca (IGS SINEX) Date: Wed, 10 Sep 2008 20:35:25 -0400 Subject: [IGSREPORT-16612] Wk 1494 IGS SINEX Combination Message-ID: <200809110035.m8B0ZPrW007425@newton.geod.nrcan.gc.ca> ****************************************************************************** IGS Electronic Report 10 Sep 17:35:27 PDT 2008 Message Number 16612 ****************************************************************************** Author: R. Ferland, M. Piraszewski =============================================================== Combined AC solution for GPS week 1494 - 08/08/24 to 08/08/30 =============================================================== 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) igs08P1494.snx Combined weekly solution. igs08P1494.erp Daily Earth Rotation Parameters. igs00p03.erp Daily Earth Rotation Parameters since GPS week 860. IGS08P35.snx Cumulative Combined solution. igs08P1494.sum This file. igs08P1494.itr Residuals between the AC and the IGS05 for the RF stations. igs08P1494.res Residuals between the AC and the Combined Weekly solution. IGS08P35.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 = igs08P1494.snx IGS = IGS08P35.snx MIT = mit14947.snx mit = mit1494g.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 gfz SATA X Y Z MIT SATA X Y Z sio SATA X Y Z mit SATA X Y Z After unconstraining: sio AUCK grg FAIR NTUS YSSK mit KUUJ 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 | 197 | 87 | 18.573 | 1.000 | 18.573 | emr | 75 | 46 | 4.403 | 1.000 | 4.403 | esa | 117 | 61 | 4.420 | 1.000 | 4.420 | gfz | 200 | 86 | 12.385 | 1.000 | 12.385 | jpl | 130 | 68 | 5.177 | 0.997 | 5.160 | MIT | 253 | 98 | 2.016 | 1.000 | 2.016 | ngs | 232 | 95 | 34.860 | 1.000 | 34.858 | sio | 234 | 94 | 2.274 | 1.000 | 2.274 | grg | 81 | 50 | 13.511 | 1.000 | 13.511 | mit | 380 | 97 | 1.824 | 0.976 | 1.781 | ncl | 214 | 94 | 0.751 | 1.000 | 0.751 | igs | 331 | 100 | 1.598 | 0.998 | 1.596 | ---------------|-----|-----|---------------|---------------|---------------| 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 87 | 0.7 0.0 -0.2 | 2.8 2.9 7.7 | emr 46 | 0.2 0.2 -0.2 | 3.2 2.7 11.3 | esa 61 | 0.6 0.0 -0.1 | 3.4 3.4 9.6 | gfz 86 | 1.3 0.0 -0.1 | 2.7 2.9 7.7 | jpl 68 | 0.5 0.0 0.3 | 2.7 3.4 10.6 | MIT 98 | 1.1 0.2 0.1 | 2.6 3.0 8.5 | ngs 95 | 1.5 0.1 -0.1 | 2.5 3.2 7.4 | sio 94 | 0.9 0.0 -0.4 | 2.8 3.0 7.6 | grg 50 | 1.2 0.2 0.0 | 2.3 1.3 6.8 | mit 97 | 1.1 0.1 0.0 | 2.6 2.9 8.0 | ncl 94 | 0.4 0.1 0.0 | 2.6 3.1 9.1 | ---------------|---------------------------|---------------------------| 5-2-2) With respect to the Weekly Combination: ================================================= Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 195 | 0.1 0.3 0.0 | 1.1 1.0 2.8 | emr 75 | -0.8 0.0 0.4 | 2.1 1.2 5.1 | esa 117 | -0.1 -0.1 -1.4 | 1.7 1.7 4.2 | gfz 197 | 0.7 -0.1 -1.1 | 0.6 0.8 2.7 | jpl 129 | 0.2 0.1 0.4 | 1.4 2.0 5.4 | MIT 231 | 0.2 0.1 -0.2 | 0.6 0.7 2.0 | ngs 218 | 0.8 0.1 -0.7 | 1.1 2.2 3.4 | sio 230 | 0.2 -0.1 0.1 | 1.2 1.3 3.2 | grg 81 | 0.4 -0.3 1.2 | 2.5 3.2 6.9 | mit 327 | 0.4 0.1 -0.2 | 0.4 0.3 1.4 | ncl 209 | -0.3 0.0 -0.1 | 1.2 1.3 4.5 | ITR 99 | -0.7 -0.1 0.2 | 2.5 2.8 7.7 | ---------------|---------------------------|---------------------------| 5-2-3) With respect to the Cumulative Combination: ===================================================== Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 179 | 0.3 0.4 0.0 | 1.6 1.6 4.7 | emr 71 | -0.4 0.0 0.4 | 2.7 1.9 7.6 | esa 109 | 0.1 0.0 -1.0 | 2.2 2.5 6.0 | gfz 183 | 0.9 0.1 -1.1 | 1.5 1.6 4.8 | jpl 119 | 0.3 0.0 -0.2 | 2.2 2.7 7.3 | MIT 205 | 0.5 0.3 0.0 | 1.3 1.5 4.7 | ngs 188 | 0.9 0.3 -0.8 | 2.0 2.9 5.4 | sio 202 | 0.5 0.1 -0.3 | 2.2 1.9 4.7 | grg 79 | 0.8 0.0 0.4 | 2.6 3.1 7.4 | mit 255 | 0.7 0.2 -0.3 | 1.5 1.4 4.4 | ncl 198 | 0.0 0.1 -0.2 | 1.9 2.1 6.2 | igs 257 | 0.3 0.2 -0.2 | 1.4 1.4 4.3 | ITR 127 | -0.4 -0.1 -0.1 | 2.2 2.1 8.2 | ---------------|---------------------------|---------------------------| 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 | -0.015 -0.014 0.002 0.5 0.2 1.1 -0.53 | emr | 0.040 -0.011 0.046 0.2 -2.1 -10.7 -0.49 | esa | 0.052 -0.017 0.024 2.3 4.1 0.4 -0.47 | gfz | 0.014 -0.036 0.010 1.2 0.4 1.7 -0.69 | jpl | 0.012 0.031 0.006 -4.9 4.2 -6.2 -0.41 | MIT | 0.013 -0.012 -0.010 1.1 1.4 -2.7 -0.53 | ngs | -0.006 -0.044 0.025 3.0 -1.1 0.7 -0.38 | sio | 0.025 -0.010 0.015 -3.1 3.1 -4.7 -0.18 | grg | -0.024 -0.022 -0.007 2.6 2.7 6.6 -0.25 | mit | -0.008 -0.006 -0.005 -0.3 0.5 -0.7 -0.53 | ncl | 0.026 -0.015 0.025 0.5 1.0 0.3 -0.38 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 -0.46 | ---------------|---------------------------------------------------------------| 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 | 0.042 0.045 0.047 1.1 1.1 1.1 0.18 | emr | 0.055 0.059 0.069 1.5 1.5 1.5 0.24 | esa | 0.048 0.053 0.056 1.3 1.3 1.3 0.20 | gfz | 0.043 0.045 0.047 1.1 1.1 1.1 0.18 | jpl | 0.048 0.049 0.055 1.3 1.3 1.3 0.20 | MIT | 0.040 0.043 0.045 1.1 1.1 1.1 0.17 | ngs | 0.041 0.044 0.045 1.1 1.1 1.1 0.17 | sio | 0.041 0.044 0.045 1.1 1.1 1.1 0.17 | grg | 0.054 0.057 0.067 1.5 1.5 1.5 0.23 | mit | 0.040 0.042 0.045 1.1 1.1 1.1 0.17 | ncl | 0.041 0.043 0.046 1.1 1.1 1.1 0.17 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.15 | ---------------|---------------------------------------------------------------| 5-4) Geocenter: ==================== | X Y Z | s X s Y s Z | | (mm) (mm) (mm) | (mm) (mm) (mm) | ---------------|---------------------------|---------------------------| igs | 1.4 0.4 -1.4 | 1.1 0.7 2.4 | ---------------|---------------------------|---------------------------| 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 | --- 6.6 -2.7 38.3 -3.5 -3.0 | esa | --- 2.8 -0.4 19.5 -1.0 -15.2 | gfz | --- 0.3 2.1 3.9 0.5 2.7 | jpl | --- 5.6 -2.5 19.7 -2.7 10.1 | MIT | --- -0.4 0.3 -18.2 0.7 -10.1 | ngs | --- -5.4 2.8 -7.2 3.1 8.7 | sio | --- 15.3 0.4 --- 1.9 --- | grg | --- 12.9 0.7 -3.1 3.2 -5.2 | mit | --- 30.4 -0.3 -0.5 1.0 -2.3 | ncl | --- --- --- --- --- --- | ITR | --- --- --- --- --- --- | BuA | --- -0.8 1.3 -2.8 5.8 -2.9 | ---------------|------------------------------------------------------------| 5-5-2) STD: ============== Solution | UT LOD XPO XPOR YPO YPOR | | us us .01mas .01ma/d .01mas .01ma/d | ---------------|------------------------------------------------------------| cod | --- --- --- --- --- --- | emr | --- 2.4 1.8 10.8 1.1 4.1 | esa | --- 4.9 1.7 5.4 2.0 9.7 | gfz | --- 2.9 1.7 6.3 0.7 6.5 | jpl | --- 8.4 1.8 5.3 1.8 10.8 | MIT | --- 2.6 1.6 4.2 1.9 11.2 | ngs | --- 13.5 5.6 10.1 6.9 12.6 | sio | --- 5.6 2.9 --- 2.5 --- | grg | --- 37.9 4.8 10.1 3.9 18.9 | mit | --- 6.6 2.9 15.7 2.5 7.9 | ncl | --- --- --- --- --- --- | ITR | --- --- --- --- --- --- | BuA | --- 18.7 6.2 10.7 4.6 12.6 | ---------------|------------------------------------------------------------| 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 cod14947.snx |CAS1 A 3| 6.3 2.7 -26.7| | | | ITRF_IGS05.snx gfz14947.snx |CAS1 A 3| 2.9 2.5 -25.7| ITRF_IGS05.snx gfz14947.snx |POLV A 1| 2.8 0.6 -22.8| ITRF_IGS05.snx gfz14947.snx |TSKB A 2| 2.9 -9.4 -1.7| | | | ITRF_IGS05.snx MIT14947.snx |CAS1 A 3| 4.4 3.5 -27.8| | | | ITRF_IGS05.snx ngs14947.snx |CAS1 A 3| 3.4 3.6 -29.7| | | | ITRF_IGS05.snx mit1494g.snx |CAS1 A 3| 4.3 2.9 -26.2| | | | ITRF_IGS05.snx ncl1494g.snx |ARTU A 3| 3.0 -5.2 -20.9| ITRF_IGS05.snx ncl1494g.snx |CAS1 A 3| 3.3 4.4 -31.9| ITRF_IGS05.snx ncl1494g.snx |MBAR A 1| 0.0 -3.7 21.8| | | | IGS08P34.snx cod14947.snx |MOBJ A 1| 0.0 2.1 31.1| | | | IGS08P34.snx MIT14947.snx |COPO A 1| 2.5 -11.5 4.1| | | | IGS08P34.snx igs08P1494.snx |HARV A 3| -6.8 -2.4 -2.9| IGS08P34.snx igs08P1494.snx |NISU A 1| 7.7 2.6 0.7| -----------------------------------------|------------|-----------------------|