From sinex at geod.nrcan.gc.ca Wed Mar 26 18:54:39 2008 From: sinex at geod.nrcan.gc.ca (IGS SINEX) Date: Wed, 26 Mar 2008 21:54:39 -0400 Subject: [IGSREPORT-16078] Wk 1470 IGS SINEX Combination Message-ID: <200803270154.m2R1sdmQ006582@newton.geod.nrcan.gc.ca> ****************************************************************************** IGS Electronic Report 26 Mar 18:54:46 PDT 2008 Message Number 16078 ****************************************************************************** Author: R. Ferland, M. Piraszewski =============================================================== Combined AC solution for GPS week 1470 - 08/03/09 to 08/03/15 =============================================================== 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) igs08P1470.snx Combined weekly solution. igs08P1470.erp Daily Earth Rotation Parameters. igs00p03.erp Daily Earth Rotation Parameters since GPS week 860. IGS08P11.snx Cumulative Combined solution. igs08P1470.sum This file. igs08P1470.itr Residuals between the AC and the IGS05 for the RF stations. igs08P1470.res Residuals between the AC and the Combined Weekly solution. IGS08P11.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 = igs08P1470.snx IGS = IGS08P11.snx MIT = mit14707.snx mit = mit1470g.snx BuA = IERS Bulletin A mit are used to quality control the weekly combination. gfz ngs 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 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 | 174 | 88 | 19.218 | 1.001 | 19.231 | emr | 69 | 48 | 4.427 | 1.000 | 4.429 | esa | 110 | 74 | 6.229 | 1.000 | 6.230 | gfz | 173 | 92 | 11.423 | 1.001 | 11.430 | jpl | 118 | 63 | 4.773 | 1.001 | 4.776 | MIT | 251 | 101 | 2.377 | 1.001 | 2.379 | ngs | 192 | 101 | 43.495 | 1.001 | 43.524 | sio | 164 | 90 | 2.563 | 1.000 | 2.564 | mit | 309 | 97 | 1.566 | 0.875 | 1.370 | igs | 287 | 103 | 1.471 | 0.997 | 1.467 | ---------------|-----|-----|---------------|---------------|---------------| 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 88 | -0.5 0.0 -0.2 | 3.0 2.6 8.6 | emr 48 | -0.6 0.0 0.5 | 3.7 2.7 9.0 | esa 74 | 0.0 -0.1 -0.1 | 3.8 2.8 11.1 | gfz 92 | -0.1 0.0 0.0 | 3.1 2.6 8.4 | jpl 63 | 0.1 0.2 0.0 | 3.0 2.7 9.8 | MIT 101 | 0.1 0.1 -0.1 | 2.9 2.7 8.4 | ngs 101 | -0.1 0.0 0.0 | 2.8 2.5 7.6 | sio 90 | 0.6 0.0 0.3 | 3.2 2.5 8.4 | mit 95 | -0.2 0.1 -0.1 | 2.6 2.1 8.0 | ---------------|---------------------------|---------------------------| 5-2-2) With respect to the Weekly Combination: ================================================= Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 168 | -0.5 0.0 -0.9 | 1.3 0.9 3.0 | emr 68 | -0.6 -0.2 0.8 | 1.7 1.1 4.3 | esa 106 | 0.4 -0.1 -0.7 | 3.1 1.5 7.9 | gfz 169 | 0.3 0.1 -0.2 | 1.3 1.0 2.7 | jpl 118 | 0.7 0.1 0.3 | 1.2 2.1 5.0 | MIT 218 | 0.2 0.1 0.4 | 0.6 1.0 2.1 | ngs 186 | 0.0 -0.1 0.1 | 1.5 1.8 3.5 | sio 160 | 0.6 -0.2 -0.8 | 1.1 1.4 3.5 | mit 271 | 0.0 0.1 0.3 | 0.4 0.3 1.4 | ITR 102 | 0.1 -0.2 -0.2 | 2.7 2.2 7.9 | ---------------|---------------------------|---------------------------| 5-2-3) With respect to the Cumulative Combination: ===================================================== Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 158 | -0.6 0.0 -1.2 | 1.7 1.7 5.0 | emr 66 | -0.6 -0.2 0.8 | 2.5 2.2 5.7 | esa 100 | 0.1 -0.1 -1.0 | 3.3 2.2 9.5 | gfz 165 | 0.1 0.0 -0.2 | 2.2 1.8 5.2 | jpl 109 | 0.5 0.3 0.2 | 1.4 2.3 6.2 | MIT 192 | -0.1 0.0 0.1 | 1.4 1.9 4.8 | ngs 182 | 0.0 0.0 -0.3 | 1.8 2.6 5.7 | sio 159 | 0.4 -0.3 -0.8 | 1.9 2.3 5.5 | mit 233 | -0.3 0.1 -0.1 | 1.4 1.6 4.5 | igs 245 | -0.2 0.1 -0.3 | 1.4 1.6 4.3 | ITR 127 | -0.2 0.0 -0.1 | 2.0 1.8 7.3 | ---------------|---------------------------|---------------------------| 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 | -0.006 -0.011 -0.004 0.6 0.4 -0.3 -0.00 | emr | 0.019 -0.003 0.012 -0.6 -4.7 -6.7 0.18 | esa | 0.015 -0.009 0.009 1.3 1.1 2.7 -0.35 | gfz | 0.013 -0.019 0.007 0.7 0.2 0.9 -0.23 | jpl | -0.011 0.002 -0.028 2.7 -10.0 -3.4 0.12 | MIT | 0.005 0.004 0.008 7.4 -10.9 -3.4 0.01 | ngs | -0.003 -0.070 0.018 2.7 -0.5 -5.9 -0.99 | sio | -0.070 -0.018 0.023 -0.2 -6.6 3.3 0.56 | mit | -0.009 0.008 -0.008 -0.4 -0.3 0.1 -0.18 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 -0.09 | ---------------|---------------------------------------------------------------| 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 | 0.043 0.044 0.047 1.1 1.1 1.1 0.17 | emr | 0.054 0.056 0.066 1.5 1.5 1.5 0.23 | esa | 0.045 0.048 0.051 1.2 1.2 1.2 0.19 | gfz | 0.042 0.042 0.047 1.1 1.1 1.1 0.17 | jpl | 0.051 0.052 0.054 1.3 1.3 1.3 0.21 | MIT | 0.040 0.041 0.045 1.1 1.1 1.1 0.17 | ngs | 0.040 0.041 0.045 1.1 1.1 1.1 0.16 | sio | 0.041 0.043 0.048 1.1 1.1 1.1 0.17 | mit | 0.041 0.042 0.046 1.1 1.1 1.1 0.17 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.46 | ---------------|---------------------------------------------------------------| 5-4) Geocenter: ==================== | X Y Z | s X s Y s Z | | (mm) (mm) (mm) | (mm) (mm) (mm) | ---------------|---------------------------|---------------------------| igs | 3.9 -5.4 -1.8 | 2.1 2.1 2.7 | ---------------|---------------------------|---------------------------| 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 | --- -11.2 -2.3 1.7 1.6 -2.1 | esa | --- -13.4 1.3 9.7 -5.7 5.4 | gfz | --- -1.1 5.0 -4.6 2.4 5.8 | jpl | --- -22.0 -0.2 16.4 -5.6 -10.3 | MIT | --- 11.9 1.3 -11.5 2.0 2.6 | ngs | --- -20.5 -3.5 8.3 -1.7 -14.6 | sio | --- -7.0 0.5 --- -4.4 --- | mit | --- -1.3 -0.2 15.2 -2.8 9.2 | ITR | --- --- --- --- --- --- | BuA | --- -21.2 0.8 14.7 -3.6 7.3 | ---------------|------------------------------------------------------------| 5-5-2) STD: ============== Solution | UT LOD XPO XPOR YPO YPOR | | us us .01mas .01ma/d .01mas .01ma/d | ---------------|------------------------------------------------------------| cod | --- --- --- --- --- --- | emr | --- 4.7 3.1 20.7 4.3 6.0 | esa | --- 15.8 2.0 6.5 1.5 5.8 | gfz | --- 11.1 1.0 11.1 1.5 10.5 | jpl | --- 24.5 1.5 10.5 1.9 15.0 | MIT | --- 3.6 2.1 8.4 2.2 10.7 | ngs | --- 16.7 3.0 11.7 7.3 5.6 | sio | --- 4.3 2.3 --- 3.1 --- | mit | --- 3.1 0.9 6.1 1.5 9.2 | ITR | --- --- --- --- --- --- | BuA | --- 23.5 1.1 9.7 5.4 7.6 | ---------------|------------------------------------------------------------| 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 cod14707.snx |CAS1 A 3| 1.2 1.3 -22.7| ITRF_IGS05.snx cod14707.snx |VESL A 1| 1.9 0.2 -22.5| | | | ITRF_IGS05.snx gfz14707.snx |HOLM A 1| 10.7 5.3 1.5| | | | ITRF_IGS05.snx jpl14707.snx |QUIN A 3| 2.0 -0.8 35.5| | | | ITRF_IGS05.snx MIT14707.snx |CAS1 A 3| -0.7 2.4 -18.3| ITRF_IGS05.snx MIT14707.snx |QUIN A 3| 2.1 -3.7 25.1| | | | ITRF_IGS05.snx ngs14707.snx |QUIN A 3| 0.7 -1.3 26.5| | | | ITRF_IGS05.snx sio14707.snx |TSKB A 2| 1.1 -0.7 -16.5| | | | ITRF_IGS05.snx mit1470g.snx |BRAZ A 1| -1.0 9.4 17.2| ITRF_IGS05.snx mit1470g.snx |CAS1 A 3| 0.8 1.3 -19.5| ITRF_IGS05.snx mit1470g.snx |GUAM A 4| -8.9 -0.3 4.6| ITRF_IGS05.snx mit1470g.snx |HOLM A 1| 8.6 4.7 4.1| ITRF_IGS05.snx mit1470g.snx |QUIN A 3| 1.8 -2.4 26.8| | | | IGS08P10.snx gfz14707.snx |KIRU A 1| 6.8 2.1 -31.9| | | | IGS08P10.snx MIT14707.snx |KIRU A 1| 5.3 2.5 -29.6| | | | IGS08P10.snx mit1470g.snx |KIRU A 1| 5.5 2.4 -31.6| IGS08P10.snx mit1470g.snx |WUHN A 4| -9.6 -4.3 -6.1| IGS08P10.snx mit1470g.snx |YELL A 5| 2.6 -7.6 4.0| | | | IGS08P10.snx igs08P1470.snx |CCJM A 1| 4.4 -7.7 -2.9| IGS08P10.snx igs08P1470.snx |MOBJ A 1| -1.2 0.8 27.6| IGS08P10.snx igs08P1470.snx |TWTF A 2| -2.1 -6.1 -10.4| IGS08P10.snx igs08P1470.snx |UNSA A 1| -6.3 -0.2 8.2| IGS08P10.snx igs08P1470.snx |YELL A 5| 2.7 -7.4 3.3| -----------------------------------------|------------|-----------------------|