To: igsreport@igscb.jpl.nasa.gov From: igs-rf@ign.fr Subject: [IGSREPORT-18368] Wk 1572 IGS SINEX Combination Message-Id: <20100310170624.7D0C7D4D774@newsmtp.ign.fr> Date: Wed, 10 Mar 2010 18:06:24 +0100 (CET) Sender: owner-igsreport Precedence: bulk ****************************************************************************** IGS Electronic Report 10 Mar 09:06:57 PST 2010 Message Number 18368 ****************************************************************************** Authors: B. Garayt, P. Rebischung =============================================================== Combined AC solution for GPS week 1572 - 10/02/21 to 10/02/27 =============================================================== 1) Contacts: ============ e-mail: igs-rf@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 igs10P1572.snx Combined weekly solution igs10P1572.erp Daily Earth Rotation Parameters igs10P1572.sum This file igs10P1572.itr Residuals between AC solutions and IGS05 for the RF stations igs10P1572.res Residuals between AC solutions and combined weekly solution IGS10P08.snx Cumulative combined solution IGS10P08.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 = mit15727.snx mig = mit1572g.snx ITR = IGS05.snx igs = igs10P1572.snx IGS = IGS10P08.snx grg, mig, ncl are not used in the combination. They are only used for comparison. Solutions with manual station deletion: 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 | 244 | 66 | 6.824 | 31.183 | emr | 86 | 48 | 2.443 | 6.194 | esa | 130 | 47 | 2.725 | 6.213 | gfz | 198 | 67 | 4.842 | 21.067 | jpl | 123 | 46 | 5.446 | 11.983 | mit | 269 | 72 | 0.686 | 3.180 | ngs | 218 | 70 | 12.602 | 41.612 | sio | 264 | 70 | 0.750 | 3.333 | grg | 105 | 43 | ------ | 12.493 | ncl | 223 | 72 | ------ | 2.525 | igs | 379 | 73 | ------ | ------ | ---------------|-----|-----|---------------|---------------| 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 66 | 0.1 -0.1 0.3 | 3.2 3.3 8.5 | emr 48 | 1.5 0.4 0.3 | 3.8 3.3 9.2 | esa 47 | 0.9 0.1 -0.1 | 3.5 3.3 10.0 | gfz 67 | 0.6 0.1 0.2 | 3.1 3.3 8.9 | jpl 46 | 0.9 0.2 -0.4 | 3.5 3.9 9.1 | mit 72 | 0.9 0.3 -0.1 | 2.9 3.4 9.0 | ngs 70 | 0.9 -0.0 -0.1 | 3.0 3.3 8.6 | sio 70 | 0.8 0.1 0.0 | 3.5 3.5 9.2 | grg 43 | 0.3 0.1 0.2 | 4.6 3.6 9.7 | ncl 72 | 0.8 0.2 -0.1 | 3.0 3.3 8.5 | ---------------|---------------------------|---------------------------| 5-2-2) With respect to the Weekly Combination: ================================================= Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 231 | -0.4 -0.1 0.1 | 0.8 0.7 2.5 | emr 86 | 0.5 0.1 -0.1 | 1.6 1.2 4.2 | esa 128 | 0.3 -0.1 0.0 | 2.7 1.2 4.7 | gfz 197 | -0.0 0.0 0.1 | 0.7 0.8 2.4 | jpl 123 | -0.0 0.0 -0.2 | 1.8 2.7 5.3 | mit 237 | 0.3 0.1 -0.1 | 0.6 0.6 1.7 | ngs 208 | -0.0 -0.0 0.1 | 1.6 1.3 2.8 | sio 261 | 0.1 -0.1 -0.0 | 1.1 0.7 2.4 | grg 104 | -1.0 -0.2 0.1 | 3.5 2.8 5.6 | ncl 223 | 0.1 0.0 -0.0 | 0.5 0.6 1.2 | ITR 73 | -0.6 -0.2 0.1 | 3.0 3.2 8.4 | ---------------|---------------------------|---------------------------| 5-2-3) With respect to the Cumulative Combination: ===================================================== Solution | Weighted Average (mm) | STD (mm) | | N E U | N E U | ---------------|---------------------------|---------------------------| cod 204 | -0.3 -0.2 0.4 | 2.5 2.5 6.3 | emr 84 | 0.9 0.2 0.2 | 2.8 2.1 6.3 | esa 117 | 0.5 -0.0 0.2 | 2.9 2.4 7.0 | gfz 193 | 0.3 -0.0 0.2 | 2.5 2.4 5.6 | jpl 118 | -0.0 0.0 0.1 | 3.0 4.1 7.3 | mit 224 | 0.4 0.0 -0.0 | 2.4 2.3 5.3 | ngs 198 | 0.2 -0.1 0.1 | 2.0 2.4 6.1 | sio 247 | 0.5 -0.1 0.1 | 3.1 2.4 5.2 | grg 103 | -0.5 -0.3 0.1 | 3.9 3.1 7.3 | ncl 218 | 0.2 -0.0 0.0 | 2.5 2.3 5.3 | igs 323 | -0.0 0.0 -0.2 | 2.7 2.6 5.4 | ITR 116 | -0.8 -0.1 -0.1 | 2.9 3.1 11.8 | ---------------|---------------------------|---------------------------| 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 | -0.003 -0.010 -0.010 1.0 1.3 0.8 -0.17 | emr | 0.022 0.013 0.006 2.9 -2.9 4.7 0.16 | esa | 0.036 -0.080 0.009 8.3 0.6 0.9 -0.02 | gfz | 0.021 -0.013 -0.010 0.8 1.4 1.1 -0.17 | jpl | -0.007 -0.050 -0.067 3.2 0.1 12.7 0.34 | mit | -0.017 0.009 -0.046 7.8 -6.7 -4.2 -0.09 | ngs | -0.024 -0.152 0.011 8.5 -2.1 -8.8 0.13 | sio | -0.136 -0.154 0.052 7.8 -7.6 -11.4 0.22 | grg | 0.004 0.008 -0.051 5.3 -1.2 15.1 0.47 | ncl | -0.002 0.049 0.042 0.0 0.0 1.4 0.00 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.04 | ---------------|---------------------------------------------------------------| 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 | 0.029 0.030 0.032 0.8 0.8 0.8 0.12 | emr | 0.035 0.038 0.040 1.0 0.9 0.9 0.15 | esa | 0.037 0.040 0.043 1.0 1.0 1.0 0.16 | gfz | 0.029 0.030 0.033 0.8 0.8 0.8 0.12 | jpl | 0.036 0.038 0.041 1.0 1.0 1.0 0.15 | mit | 0.029 0.030 0.032 0.8 0.8 0.8 0.12 | ngs | 0.028 0.030 0.031 0.8 0.8 0.7 0.12 | sio | 0.029 0.031 0.033 0.8 0.8 0.8 0.12 | grg | 0.040 0.042 0.048 1.1 1.1 1.1 0.17 | ncl | 0.027 0.028 0.030 0.7 0.7 0.7 0.11 | igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.18 | ---------------|---------------------------------------------------------------| 5-4) Geocenter: ==================== | X Y Z | s X s Y s Z | | (mm) (mm) (mm) | (mm) (mm) (mm) | ---------------|---------------------------|---------------------------| igs | 9.3 -4.0 -5.5 | 1.6 1.3 3.8 | ---------------|---------------------------|---------------------------| 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 | --- -14.5 1.1 23.8 -1.1 -5.7 | esa | --- 1.5 -4.0 12.8 -4.5 -14.3 | gfz | --- -4.8 -0.6 -3.5 0.3 -17.3 | jpl | --- -2.5 0.8 22.0 -3.1 1.7 | mit | --- 1.8 1.5 -4.7 0.1 18.7 | ngs | --- -1.0 -1.9 6.2 -2.1 -21.4 | sio | --- -2.4 1.3 4.3 -1.2 0.9 | grg | --- 9.0 -1.4 14.2 5.0 7.5 | ncl | --- --- --- --- --- --- | BuA | --- 1.8 -1.9 16.2 1.9 4.0 | ---------------|------------------------------------------------------------| 5-5-2) STD: ============== Solution | UT LOD XPO XPOR YPO YPOR | | us us .01mas .01ma/d .01mas .01ma/d | ---------------|------------------------------------------------------------| cod | --- --- --- --- --- --- | emr | --- 7.8 4.2 12.9 3.1 19.9 | esa | --- 3.2 2.8 5.0 3.0 12.0 | gfz | --- 6.6 2.3 3.4 1.6 11.1 | jpl | --- 9.4 2.9 18.0 2.3 18.1 | mit | --- 1.0 0.9 2.6 1.0 6.9 | ngs | --- 5.2 4.0 15.2 5.6 10.7 | sio | --- 1.1 1.6 3.0 0.9 5.5 | grg | --- 19.3 3.6 8.2 3.3 7.3 | ncl | --- --- --- --- --- --- | BuA | --- 11.7 5.4 9.2 3.4 6.7 | ---------------|------------------------------------------------------------| 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)| -----------------------------------------|------------|-----------------------| | | | cod15727.snx Combination: Iter. 1 |KHAJ A 2| 2.0 -0.1 11.0| gfz15727.snx Combination: Iter. 1 |ADE1 A 1| -0.2 1.1 -9.5| sio15727.snx Combination: Iter. 1 |OHI3 A 1| -1.6 -1.7 20.9| | | | igs10P1572.snx Stacking: Iter. 1 |EIL1 A 1| -2.7 13.8 33.2| | | | -----------------------------------------|------------|-----------------------|