========================================================================= IGS-RNAAC-SIR ANALYSIS REPORT REPROCESSING OF THE SIRGAS-CON NETWORK FOR GPS WEEK 1170 (DAYS 160-166, DATES 09-06-2002 - 15-06-2002) ========================================================================= 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 ========================================================================= SI111707.SNX covariance matrix loosely constrained weekly solution SI111707.SUM this text file si102P1170.snx covariance matrix constrained weekly solution si102P1170.crd final SIRGAS-CON coordinates for week 1170 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 ------------------------------------------------ 1170 50 1.50 0.56 RESIDUALS WITH RESPECT TO ig101P1402 SOLUTION ============================================== Week No. Stations N [mm] E[mm] Up [mm] ------------------------------------------------------- 1170 IGS05 Stations (12) 1.0 1.5 1.0 1170 All IGS Stations (38) 2.1 3.5 6.7 RESIDUALS WITH RESPECT TO si101P1169 SOLUTION ============================================== Week No. Stations N [mm] E[mm] Up [mm] ------------------------------------------------------- 1170 All stations (49) 2.0 3.0 6.3 REPEATABILITY OF STATION POSITIONS ================================== Total number of stations: 50 ---------------------------------------------------- Weekday Repeatability (mm) Station #Days 0123456 N E U ---------------------------------------------------- AOML 49914S001 7 XXXXXXX 2.30 4.12 5.23 ASC1 30602M001 7 XXXXXXX 4.20 9.22 4.63 AUTF 41515S001 6 XXXX XX 1.84 3.17 3.15 BOGA 41901M002 7 XXXXXXX 1.14 2.61 7.83 BOGT 41901M001 7 XXXXXXX 3.76 2.35 23.99 BRAZ 41606M001 5 XXXXX 1.30 2.59 3.50 BRMU 42501S004 7 XXXXXXX 3.82 6.32 9.77 CFAG 41517S001 7 XXXXXXX 1.24 1.52 5.36 CIC1 40508M002 7 XXXXXXX 2.70 3.71 5.82 CONZ 41719M002 6 XXXXXX 0.76 1.19 3.61 CRO1 43201M001 7 XXXXXXX 1.53 2.95 8.03 CUIB 41603M001 7 XXXXXXX 1.15 1.77 3.53 EISL 41703M003 7 XXXXXXX 2.49 7.06 9.35 ELEN 40902S001 7 XXXXXXX 1.53 3.25 5.70 ESTI 41202S001 7 XXXXXXX 2.12 6.11 8.55 FORT 41602M001 7 XXXXXXX 4.43 7.53 13.10 GALA 42005M001 7 XXXXXXX 1.98 2.87 5.88 GOLD 40405S031 7 XXXXXXX 2.57 3.60 6.60 GOUG 30608M001 7 XXXXXXX 3.97 7.82 14.69 GUAT 40901S001 7 XXXXXXX 5.09 2.99 7.77 IGM0 41505M002 7 XXXXXXX 1.18 1.19 4.17 IMPZ 41615M001 5 XXX XX 4.14 2.39 4.17 JAMA 42601S001 7 XXXXXXX 1.24 3.05 2.90 KOUR 97301M210 6 XXXXXX 2.07 2.54 11.47 KYW1 49852S001 7 XXXXXXX 4.62 7.54 15.75 LPGS 41510M001 7 XXXXXXX 1.00 1.22 6.18 MANA 41201S001 7 XXXXXXX 1.16 4.87 7.71 MANZ 40513S001 7 XXXXXXX 3.58 3.37 11.73 MARA 42402M001 7 XXXXXXX 1.73 2.94 14.23 MDO1 40442M012 7 XXXXXXX 2.61 2.99 4.83 OHI2 66008M005 4 XXXX 2.14 2.82 2.89 PALM 66005M002 7 XXXXXXX 2.53 2.05 4.88 PARA 41610M001 7 XXXXXXX 1.36 1.72 5.71 PIE1 40456M001 7 XXXXXXX 2.47 3.45 6.87 POAL 41616M001 7 XXXXXXX 2.10 2.38 3.64 PUR3 82001S003 7 XXXXXXX 1.00 1.48 8.13 RECF 41617M001 7 XXXXXXX 3.75 3.11 8.08 RIOD 41608M001 7 XXXXXXX 1.50 0.94 3.84 RIOG 41507M004 7 XXXXXXX 2.40 1.64 3.47 RWSN 41513M001 7 XXXXXXX 1.18 1.70 3.62 SALV 41618M001 6 XXXX XX 2.92 3.78 5.50 SANT 41705M003 7 XXXXXXX 1.10 1.88 4.04 SCUB 40701M001 4 XXX X 0.66 2.80 1.91 SLOR 41102S001 6 XX XXXX 2.10 3.78 5.49 TEG1 41101S002 7 XXXXXXX 3.46 3.62 9.72 TUCU 41520S001 3 XXX 0.95 1.90 4.29 UEPP 41611M001 7 XXXXXXX 1.22 2.38 3.89 UNSA 41514M001 7 XXXXXXX 1.36 1.32 6.65 VBCA 41512M001 7 XXXXXXX 1.59 1.56 3.68 VICO 41613M001 7 XXXXXXX 0.68 1.55 1.61 ---------------------------------------------------- Total 331 2.51 3.80 8.08 ----------------------------------------------------