From igs-rf at ign.fr Wed May 26 08:03:45 2010 From: igs-rf at ign.fr (igs-rf at ign.fr) Date: Wed, 26 May 2010 17:03:45 +0200 (CEST) Subject: [IGSREPORT-18620] Wk 1583 IGS SINEX Combination Message-ID: <20100526150345.45D53D4F467@newsmtp.ign.fr> ****************************************************************************** IGS Electronic Report 26 May 08:04:18 PDT 2010 Message Number 18620 ****************************************************************************** Authors: B. Garayt, P. Rebischung =============================================================== Combined AC solution for GPS week 1583 - 10/05/09 to 10/05/15 =============================================================== 1) Contacts: ============ e-mail: igs-rf at ign.fr Tel: 0033143988197 (Bruno Garayt) Fax: 0033143988450 2) Products: ============ All products are available at: CDDIS: ftp://cddis.gsfc.nasa.gov/gps/products SOPAC: ftp://garner.ucsd.edu/pub/products IGN: ftp://igs.ensg.eu/pub/igs/products ftp://igs.ign.fr/pub/igs/products igs10P1583.snx Combined weekly solution igs10P1583.erp Daily Earth Rotation Parameters igs10P1583.sum This file igs10P1583.itr Residuals between AC solutions and IGS05 for the RF stations igs10P1583.res Residuals between AC solutions and combined weekly solution IGS10P19.snx Cumulative combined solution IGS10P19.res Residuals between AC solutions and cumulative solution igs00p03.erp Daily Earth Rotation Parameters since GPS week 860 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) Constrained AC solutions are unconstrained according to the information given in their SOLUTION/APRIORI blocks and then minimally constrained. AC solutions given in the form of a normal matrix (esa) are inverted by adding minimal constraints. 3-4) The weekly AC solutions are combined. The 7-parameters singularity is avoided by using internal constraints. Iterations are performed until no residuals exceed 5 cm or 5 sigma. 3-5) The combined solution is compared to IGS05 propagated at current week (datum). Some outliers may be removed from the datum. Finally, the combined solution is aligned to the datum using a 7-parameters transformation. 3-6) The AC solutions NOT used in the combination are compared to the combined solution in order to identify and remove outliers. 3-7) The weekly combined solution is added to the cumulative solution. Iterations are performed until no residuals exceed 3 cm or 3 sigma in the weekly solution. 3-8) The updated cumulative solution is compared to IGS05 (datum). Some outliers may be removed from the datum. Finally, the cumulative solution is aligned to the datum using a 14-parameters transformation. 4) Remarks: =========== mit = mit15837.snx mig = mit1583g.snx ITR = IGS05.snx igs = igs10P1583.snx IGS = IGS10P19.snx sio, mig, ncl are not used in the combination. They are only used for comparison. Solutions with manual station deletion: emr NKLG gfz NKLG grg NKLG mit NKLG SOFI sio NKLG 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: ============================================= At each iteration, the variance factor for solution s is estimated by : VF = (vs'*Ps*vs)/fs with fs = nobss - tr(As*Q*As'*Ps) vs : residuals of solution s Ps : weight matrix of solution s nobss : number of observations of solution s As : design matrix of solution s Q : total covariance matrix This variance factor is used to rescale the covariance matrix of solution s for the next iteration. Another scale factor is computed for each solution s, by comparing it to the official cumulative solution of previous week (IGS) : SF = (vs'*Ps*vs)/(3*nstas) with vs : residuals of the comparison Ps : weight matrix of solution s nstas : number of common stations Solution |# sta| #RF | Final VF | SF | ---------------|-----|-----|---------------|---------------| cod | 246 | 65 | 6.605 | 23.237 | emr | 85 | 46 | 2.799 | 6.834 | esa | 142 | 43 | 2.741 | 5.192 | gfz | 197 | 57 | 4.545 | 16.679 | grg | 126 | 47 | 6.553 | 9.687 | jpl | 115 | 44 | 5.161 | 10.971 | mit | 253 | 70 | 0.696 | 2.673 | ngs | 210 | 68 | 16.099 | 37.386 | sio | 270 | 67 | 0.898 | 2.430 | ncl | 220 | 69 | ------ | 3.170 | igs | 388 | 71 | ------ | ------ | ---------------|-----|-----|---------------|---------------| 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 | -0.4 0.1 0.1 | 3.1 3.4 9.6 | emr 46 | 0.1 0.2 0.2 | 3.5 3.5 8.5 | esa 43 | -1.3 0.4 0.3 | 3.6 3.7 10.4 | gfz 57 | 0.0 0.1 -0.4 | 2.9 3.2 8.6 | grg 47 | 0.5 0.3 0.1 | 3.4 3.5 7.6 | jpl 44 | 0.1 0.1 -0.1 | 2.7 3.4 9.0 | mit 70 | -0.4 0.3 0.4 | 2.6 3.2 9.4 | ngs 68 | -0.0 0.3 0.1 | 2.7 3.4 9.1 | sio 67 | -0.5 0.3 0.3 | 3.1 3.1 8.6 | ncl 69 | -0.3 0.3 0.0 | 2.8 3.1 8.6 | ---------------|---------------------------|---------------------------| 5-2-2) With respect to the Weekly Combination: ================================================= Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 233 | 0.0 -0.0 0.0 | 1.0 0.7 2.4 | emr 84 | 0.5 0.0 -0.0 | 2.3 1.1 5.1 | esa 139 | 0.0 0.0 0.3 | 2.4 1.2 5.1 | gfz 191 | 0.1 -0.1 -0.0 | 0.6 0.7 2.4 | grg 123 | 0.4 -0.1 0.0 | 2.9 2.3 5.3 | jpl 115 | 0.7 0.0 -0.2 | 1.7 2.3 4.8 | mit 238 | -0.0 -0.0 0.0 | 0.6 0.6 1.7 | ngs 209 | 0.2 0.2 0.0 | 1.3 2.0 2.8 | sio 266 | -0.2 0.1 0.0 | 1.8 1.1 2.8 | ncl 219 | 0.0 0.0 0.0 | 0.7 0.7 0.9 | ITR 71 | 0.2 -0.2 -0.2 | 2.7 3.3 8.8 | ---------------|---------------------------|---------------------------| 5-2-3) With respect to the Cumulative Combination: ===================================================== Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 217 | -0.5 -0.1 0.1 | 1.9 2.0 5.2 | emr 84 | -0.2 0.2 0.1 | 2.6 2.5 5.9 | esa 131 | -0.8 0.1 0.3 | 2.7 2.3 6.2 | gfz 187 | -0.4 -0.0 -0.0 | 1.6 1.9 4.9 | grg 120 | -0.1 -0.0 0.0 | 3.1 2.3 5.4 | jpl 110 | -0.2 0.1 -0.2 | 2.7 3.4 7.1 | mit 229 | -0.6 -0.1 0.2 | 1.6 2.1 4.4 | ngs 200 | -0.3 0.2 0.1 | 1.9 3.0 4.9 | sio 252 | -0.7 0.1 0.1 | 2.4 2.1 4.7 | ncl 216 | -0.7 -0.0 0.0 | 1.5 2.0 4.2 | igs 341 | -0.6 -0.0 -0.0 | 1.8 2.2 4.3 | ITR 116 | -0.8 -0.1 -0.1 | 3.0 3.3 12.1 | ---------------|---------------------------|---------------------------| 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 | -0.004 -0.032 0.012 0.8 0.9 0.8 0.00 | emr | 0.021 -0.007 -0.050 2.5 1.2 -1.1 0.46 | esa | 0.038 0.058 -0.115 1.8 2.9 3.5 -0.05 | gfz | -0.003 0.056 -0.086 -1.6 1.5 0.3 0.35 | grg | -0.001 0.029 -0.029 2.8 -0.9 -5.0 0.54 | jpl | 0.018 -0.048 -0.033 5.6 0.1 -0.7 0.43 | mit | -0.018 -0.010 -0.016 4.1 -3.4 0.9 0.13 | ngs | 0.007 -0.042 0.003 3.4 0.4 3.1 0.27 | sio | -0.033 0.436 -0.672 -0.2 1.5 -7.0 0.45 | ncl | 0.023 0.216 -0.130 -5.3 0.8 0.4 0.22 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.30 | ---------------|---------------------------------------------------------------| 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 | 0.032 0.033 0.036 0.9 0.9 0.8 0.13 | emr | 0.033 0.035 0.039 0.9 0.9 0.9 0.14 | esa | 0.041 0.044 0.049 1.1 1.1 1.1 0.17 | gfz | 0.032 0.033 0.035 0.9 0.8 0.8 0.13 | grg | 0.032 0.034 0.036 0.9 0.9 0.8 0.13 | jpl | 0.036 0.037 0.041 1.0 1.0 1.0 0.15 | mit | 0.030 0.031 0.033 0.8 0.8 0.8 0.12 | ngs | 0.030 0.031 0.033 0.8 0.8 0.8 0.12 | sio | 0.028 0.030 0.031 0.8 0.8 0.7 0.12 | ncl | 0.029 0.029 0.031 0.8 0.8 0.7 0.12 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.20 | ---------------|---------------------------------------------------------------| 5-4) Geocenter: ==================== | X Y Z | s X s Y s Z | | (mm) (mm) (mm) | (mm) (mm) (mm) | ---------------|---------------------------|---------------------------| igs | 3.8 -0.1 3.3 | 1.4 1.2 3.3 | ---------------|---------------------------|---------------------------| 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 | --- -14.7 1.4 -4.5 3.7 20.7 | esa | --- 7.8 -0.5 -2.0 -0.9 19.2 | gfz | --- 0.7 -0.0 -1.3 0.7 -5.5 | grg | --- --- 3.1 11.9 -6.2 2.3 | jpl | --- -11.3 2.2 -6.7 -0.8 19.3 | mit | --- -0.9 0.3 3.5 0.6 -4.1 | ngs | --- 8.4 -2.5 -19.7 -7.6 -1.2 | sio | --- -9.4 0.9 -11.9 4.3 4.2 | ncl | --- --- --- --- --- --- | BuA | --- 5.6 -1.7 -2.6 4.8 3.7 | ---------------|------------------------------------------------------------| 5-5-2) STD: ============== Solution | UT LOD XPO XPOR YPO YPOR | | us us .01mas .01ma/d .01mas .01ma/d | ---------------|------------------------------------------------------------| cod | --- --- --- --- --- --- | emr | --- 11.9 3.3 10.5 2.0 12.8 | esa | --- 14.1 2.1 5.8 1.0 11.2 | gfz | --- 9.6 0.6 8.1 1.7 6.3 | grg | --- --- 6.2 16.7 4.8 13.3 | jpl | --- 8.8 2.0 10.9 0.8 10.9 | mit | --- 5.0 1.0 2.4 0.6 3.4 | ngs | --- 13.7 3.8 6.0 1.4 11.7 | sio | --- 0.6 1.2 5.4 0.9 3.8 | ncl | --- --- --- --- --- --- | BuA | --- 25.1 1.9 7.1 1.5 10.4 | ---------------|------------------------------------------------------------| 5-6) Satellite Antenna Offset Residuals weighted Average & STD: ==================================================================== No Satellite phase center ... 5-7) Outliers: =================== Outliers may be rejected at different stages of the processing: - During the combination (stage 3-4)), outliers may be removed from the weekly AC solutions. Thresholds are set to 5 cm and 5 sigma. - During stage 3-6), outliers may be removed from the AC solutions NOT included in the combination. Thresholds are set to 5 cm and 5 sigma. - During the stacking of the weekly combined solution on the cumulative solution (stage 3-7)), outliers may be removed from the weekly solution. Thresholds are set to 3 cm and 3 sigma. Solution Stage of rejection | Station | N E U | |code id soln| (mm) (mm) (mm)| -----------------------------------------|------------|-----------------------| | | | grg15837.snx Combination: Iter. 1 |CONZ A 3| -10.5 31.9 10.8| grg15837.snx Combination: Iter. 1 |AREQ A 6| -22.6 -30.5 -6.3| sio15837.snx Combination: Iter. 1 |HOB2 A 2| 10.2 0.0 2.5| | | | ncl1583g.snx Comp. to igs10P1583.snx |NKLG A 2| -3.4 2.6 -71.9| | | | igs10P1583.snx Stacking: Iter. 1 |XIAN A 1| -4.6 37.7 -24.2| | | | -----------------------------------------|------------|-----------------------|