========================================================================= IGS-RNAAC-SIR ANALYSIS REPORT REPROCESSING OF THE SIRGAS-CON NETWORK FOR GPS WEEK 1274 (DAYS 158-164, DATES 06-06-2004 - 12-06-2004) ========================================================================= Responsible: Deutsches Geodaetisches Forschungsinstitut (DGFI) Wolfgang Seemueller (seemueller@dgfi.badw.de) Laura Sanchez (sanchez@dgfi.badw.de) Since the IGS standards include absolute calibration values for the antenna phase centre corrections since the GPS week 1400, the SIRGAS-CON weekly solutions from January 2000 to November 2006 computed with relative phase centre corrections and referred to former ITRF solutions have been reprocessed including absolute phase centre corrections and the IGS05 as reference frame. This report describes the main features of the reprocessing. On the other hand, constrained weekly solutions between weeks 1401 and 1494 were recomputed by applying the same constraint described in the item 10) of the following section. ========================================================================= Processing strategy ========================================================================= 1) Elevation mask and data sampling rate are set to 3° and 30 s, respectively. 2) Absolute calibration values for the antenna phase centre corrections published by the IGS are applied. 3) Satellite orbits, satellite clock offsets, and Earth orientation parameters are fixed to the combined IGS weekly solutions. Earlier satellite orbits are transformed from ITRF97 or ITRF2000 to ITRF2005. 4) The quasi ionosphere free (QIF) strategy is applied for solving the L1 and L2 phase ambiguities. 5) Periodic site movements due to ocean tide loading are modelled according to the FES2004 ocean tide model. The corresponding values are provided by M.S. Bos and H.-G. Scherneck at http://www.oso.chalmers.se/~loading/. 6) Zenith delay due to the tropospheric refraction (~ wet part) is estimated at a 2 hours interval within the network adjustment. The Niell (1996) dry mapping function is applied to the a priori delay (~ dry part) modelled using the Saastamoinen model. 7) Daily free normal equations are computed by applying the double differences strategy (Bernese Software 5.0). 8) Daily free normal equations are combined for computing a loosely constrained weekly solution for station coordinates (all station coordinates are constrained to +/- 1 m). 9) Stations with large residuals in the weekly combination (more than 20 mm in the N-E component, and more than 30 mm in the Up component) are reduced from the normal equations. Steps (8) and (9) are iterative. 10) A weekly solution for station positions aligned to the IGS05 is computed. The datum realization is giving by constraining the IGS weekly coordinates of the IGS05 stations. In this case, weekly coordinates of the IGS reprocessing (series ig1) are applied as reference values. The applied constraint (in Bernese Software) is 1E-04 m. ========================================================================= Results ========================================================================= SI112747.SNX covariance matrix loosely constrained weekly solution SI112747.SUM this text file si104P1274.snx covariance matrix constrained weekly solution si104P1274.crd final SIRGAS-CON coordinates for week 1274 These results are available at ftp://ftp.dgfi.badw-muenchen.de//pub/gps/SIRGAS/ ...wwww... (wwwww=GPS week) STATISTICS ********** Week No. Stations RMS [mm] Chi**2/DOF ------------------------------------------------ 1274 64 1.46 0.54 RESIDUALS WITH RESPECT TO ig101P1402 SOLUTION ============================================== Week No. Stations N [mm] E[mm] Up [mm] ------------------------------------------------------- 1274 IGS05 Stations (15) 1.4 1.2 0.6 1274 All IGS Stations (38) 2.3 2.0 5.0 RESIDUALS WITH RESPECT TO si101P1273 SOLUTION ============================================== Week No. Stations N [mm] E[mm] Up [mm] ------------------------------------------------------- 1274 All stations (59) 1.4 1.4 4.2 REPEATABILITY OF STATION POSITIONS ================================== Total number of stations: 64 ---------------------------------------------------- Weekday Repeatability (mm) Station #Days 0123456 N E U ---------------------------------------------------- ANTC 41713S001 7 XXXXXXX 1.75 1.35 9.56 AREQ 42202M005 7 XXXXXXX 0.85 2.54 4.68 ASC1 30602M001 7 XXXXXXX 1.07 3.04 4.39 BDOS 43401M001 2 XX 0.98 0.88 2.73 BELE 41622M001 7 XXXXXXX 1.56 0.73 8.69 BOGA 41901M002 7 XXXXXXX 1.52 2.55 2.77 BOGT 41901M001 6 X XXXXX 3.75 3.23 21.32 BOMJ 41612M001 7 XXXXXXX 1.76 1.44 1.90 BRAZ 41606M001 7 XXXXXXX 1.86 1.87 2.26 BRMU 42501S004 7 XXXXXXX 2.25 2.12 6.78 CALI 41903S001 7 XXXXXXX 0.79 1.63 6.90 CFAG 41517S001 7 XXXXXXX 1.13 1.80 2.28 CHPI 41609M003 7 XXXXXXX 2.03 1.65 3.40 CIC1 40508M002 7 XXXXXXX 1.18 1.74 3.47 CONZ 41719M002 7 XXXXXXX 1.83 1.90 4.10 COPO 41714S001 7 XXXXXXX 1.02 1.33 3.32 CRAT 41619M001 7 XXXXXXX 2.03 2.42 4.03 CRO1 43201M001 7 XXXXXXX 1.27 3.05 6.57 CUCU 41904S001 6 XXXX XX 3.70 2.37 8.14 CUIB 41603M001 7 XXXXXXX 1.59 2.08 3.54 EISL 41703M003 7 XXXXXXX 2.74 1.77 6.18 ELEN 40902S001 7 XXXXXXX 1.45 1.68 6.58 ETCG 40602M001 7 XXXXXXX 0.78 2.52 3.65 FORT 41602M001 5 XXX XX 4.06 2.42 10.71 GLPS 42005M002 7 XXXXXXX 0.90 1.26 3.77 GOLD 40405S031 7 XXXXXXX 1.52 1.48 4.85 GOUG 30608M001 4 XXXX 2.64 5.24 13.91 GUAT 40901S001 7 XXXXXXX 2.07 1.85 4.65 IGM1 41505M003 6 X XXXXX 1.49 0.97 6.55 IMPZ 41615M001 7 XXXXXXX 1.96 1.18 6.37 ISPA 41703M007 7 XXXXXXX 1.91 4.28 8.35 KOUR 97301M210 6 XXXX XX 2.85 2.03 12.88 KYW1 49852S001 7 XXXXXXX 1.06 3.39 5.15 LPGS 41510M001 7 XXXXXXX 1.40 0.72 7.70 MANA 41201S001 6 XXXXXX 2.01 2.54 9.21 MARA 42402M001 7 XXXXXXX 0.77 1.07 5.50 MDO1 40442M012 7 XXXXXXX 1.32 2.48 6.01 MPLA 41521M001 2 XX 0.72 0.78 11.85 MZAC 41503M001 4 XXXX 1.68 1.87 2.92 OHI2 66008M005 6 XXXXXX 1.31 0.56 5.83 PALM 66005M002 7 XXXXXXX 2.06 0.97 4.92 PARA 41610M001 7 XXXXXXX 1.54 1.78 2.42 PARC 41716S001 5 XX XXX 0.84 4.37 10.63 PERA 41905S001 7 XXXXXXX 2.12 2.59 6.25 PIE1 40456M001 7 XXXXXXX 0.71 2.10 3.34 POAL 41616M001 5 XXXXX 1.28 2.26 5.67 PUR3 82001S003 7 XXXXXXX 2.35 3.44 8.61 QUI1 42003S003 7 XXXXXXX 1.22 1.94 4.62 RECF 41617M001 7 XXXXXXX 1.60 2.05 3.61 RIOD 41608M001 7 XXXXXXX 2.99 1.80 2.51 RIOG 41507M004 7 XXXXXXX 1.52 1.45 2.98 RWSN 41513M001 7 XXXXXXX 1.71 0.99 2.83 SALV 41618M001 5 XXXXX 1.79 2.85 7.46 SANT 41705M003 7 XXXXXXX 1.88 1.70 1.91 SCUB 40701M001 7 XXXXXXX 2.31 2.00 5.36 SMAR 41621M001 7 XXXXXXX 3.58 1.15 6.03 UCOR 41502M001 7 XXXXXXX 1.14 1.76 7.88 UEPP 41611M001 7 XXXXXXX 2.03 2.44 2.20 UNRO 41525M001 6 X XXXXX 1.89 1.80 4.14 UNSA 41514M001 3 XXX 0.90 1.17 4.13 VALL 41906S001 4 XX XX 0.82 3.45 5.73 VBCA 41512M001 7 XXXXXXX 1.91 0.85 4.13 VESL 66009M001 7 XXXXXXX 1.79 1.40 5.21 VICO 41613M001 7 XXXXXXX 0.99 1.13 3.28 ---------------------------------------------------- Total 410 1.87 2.15 6.38 ----------------------------------------------------