========================================================================= IGS-RNAAC-SIR ANALYSIS REPORT REPROCESSING OF THE SIRGAS-CON NETWORK FOR GPS WEEK 1049 (DAYS 044-050, DATES 13-02-2000 - 19-02-2000) ========================================================================= 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 stations 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 ========================================================================= SI110497.SNX covariance matrix loosely constrained weekly solution SI110497.SUM this text file si100P1049.snx covariance matrix constrained weekly solution si100P1049.crd final SIRGAS-CON coordinates for week 1049 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 ------------------------------------------------ 1049 39 1.51 0.57 RESIDUALS WITH RESPECT TO ig100P1049 SOLUTION ============================================== Week No. Stations N [mm] E[mm] Up [mm] ------------------------------------------------------- 1049 IGS05 Stations (10) 1.5 3.0 0.6 1049 All IGS Stations (30) 2.2 5.8 7.3 RESIDUALS WITH RESPECT TO si100P1048 SOLUTION ============================================== Week No. Stations N [mm] E[mm] Up [mm] ------------------------------------------------------- 1049 All stations (39) 2.2 2.1 4.8 REPEATABILITY OF STATION POSITIONS ================================== Total number of stations: 39 ---------------------------------------------------- Weekday Repeatability (mm) Station #Days 0123456 N E U ---------------------------------------------------- AOML 49914S001 7 XXXXXXX 0.85 3.52 4.71 AR1Q 42202M005 6 XXXXXX 4.22 15.95 7.75 ASC1 30602M001 6 XXXX XX 2.80 7.47 14.04 BOGA 41901M002 7 XXXXXXX 1.99 3.47 8.39 BRAZ 41606M001 5 XXXXX 1.98 3.21 5.52 BRMU 42501S004 7 XXXXXXX 1.96 4.53 5.70 CART 41902M001 7 XXXXXXX 1.81 2.69 5.91 CFAG 41517S001 7 XXXXXXX 2.09 2.39 3.60 CIC1 40508M002 7 XXXXXXX 2.61 4.68 4.46 CORD 41511M001 7 XXXXXXX 1.38 3.16 4.85 COYQ 41715S001 6 XXXXXX 1.98 2.26 4.33 CRO1 43201M001 7 XXXXXXX 1.64 6.16 10.52 EISL 41703M003 7 XXXXXXX 3.66 8.50 15.35 FORT 41602M001 6 XXXX XX 3.04 10.59 17.29 GALA 42005M001 5 XXXXX 2.34 9.70 14.66 GOUG 30608M001 7 XXXXXXX 4.83 9.18 14.36 IGM0 41505M002 7 XXXXXXX 1.36 3.05 6.24 JAMA 42601S001 7 XXXXXXX 2.13 2.47 5.42 KYW1 49852S001 7 XXXXXXX 2.18 3.02 5.79 LPGS 41510M001 7 XXXXXXX 2.04 2.42 6.13 MARA 42402M001 7 XXXXXXX 2.37 3.59 6.91 MDO1 40442M012 7 XXXXXXX 2.78 3.63 4.07 OHIG 66008M001 7 XXXXXXX 4.11 2.92 6.27 PALM 66005M002 7 XXXXXXX 3.61 2.26 5.69 PARA 41610M001 5 XXXXX 3.95 3.46 8.12 PARC 41716S001 7 XXXXXXX 2.38 2.62 5.21 PIE1 40456M001 7 XXXXXXX 2.15 4.75 3.63 POAL 41616M001 7 XXXXXXX 1.84 3.56 3.99 PUR3 82001S003 7 XXXXXXX 1.28 6.16 9.70 RECF 41617M001 7 XXXXXXX 3.99 8.63 9.22 RIOG 41507M004 7 XXXXXXX 2.70 2.04 2.04 RIOP 42006M001 7 XXXXXXX 3.51 5.37 10.38 SALV 41618M001 6 XXXXXX 2.52 11.69 5.12 SANT 41705M003 7 XXXXXXX 2.08 1.91 4.89 SCUB 40701M001 6 XX XXXX 1.33 2.92 4.60 UEPP 41611M001 7 XXXXXXX 4.11 4.24 7.98 UNSA 41514M001 2 X X 2.12 8.34 6.24 VESL 66009M001 7 XXXXXXX 3.06 5.36 5.17 VICO 41613M001 7 XXXXXXX 2.47 4.90 8.09 ---------------------------------------------------- Total 256 2.72 5.72 7.98 ----------------------------------------------------