****************************************************************************** dorisreport 28-Dec-2013 13:28:26 Message No 3521 ****************************************************************************** Author: "Lemoine, Frank G. (GSFC-6980)" Subject: GSC SINEX Delivery, gscwd20, 2013/188 to 2013/272 SUMMARY OF GSC DORIS SUBMISSION for 3rd Quarter wd20 SINEX files December 28, 2013 The files delivered today to the public archives consist of SINEX files for the wd20 series from 2013-DOY188 to 2013-DOY272. NOTE(1): Note that this series has suffered the loss of SPOT-4, as that satellite was decommissioned in June 2013. NOTE(2): The SPOT-5 used herein use the SAA-corrected DORIS data files supplied by H. Capdeville. The wd20 series is the baseline series for the ITRF computations, however for ITRF2013 we will apply the DORIS antenna phase law and a model of time-variable gravity perturbations, based on weekly solutions. The ITRF computation series are in progress, and those series are not yet publically available. As a reminder, this wd20 series has the following characteristics, compared to the previous series. 1. Explicit modelling of the pole according to the IERS2010 standards (Table 7.7, pp 115, IERS Conventions (2010), Petit and Luzum. 2. C21, S21 are modelled in the long term according to equation 6.5 of the above document. 3. A new DORIS station set was adopted (DPOD2008_1_12). This updates some of the stations, and adds new stations towards the end of the series. Consequently, compared to wd18, the newer DORIS stations not included in wd18 are now part of the wd20 processing. 4. In wd18, we identified stations which had less than 250 observations and removed them at the normal equation stage - however they had remained as part of the POD processing. In wd20, we explicitly deleted stations from the POD analyses that had less than 250 observations in any given week. In our experience, stations with too few observations were invariably associated with weak coordinate solutions. 5. A timing bias model was added for the DORIS processing of TOPEX, derived from the SLR-DORIS analyses (wd18). 6. Due to a discrepancy in the attitude law for Cryosat-2 in the previous version of GEODYN we now use the quaternions supplied by E.J.O. Schrama (TU Delft). We continue to use the CNES 7plate macromodel for Cryosat-2. quaternions supplied by E.J.O. Schrama (TU Delft). We continue to use the CNES 7plate macromodel for Cryosat-2. 7. For SPOT-5, from 2006.0 to 2013.0, the SAA-corrected data were used, instead of the standard DORIS data. No deweighting scheme was applied to the SPOT5/SAA stations, however Cacheoira (CACB, CADB) was explicitly deleted from the SPOT-5 POD processing, since this was the station whose data were most severely disrupted by the SAA. 8. More frequent Cd (drag) adjustments were applied for certain time periods, as per Laurent Soudarin from the DORIS AWG Meeting Toulouse (April 2013). This affected SPOT-2, SPOT-3, SPOT-4, SPOT-5, Envisat and Cryosat-2. 9. It was ascertained that the solar array pitch of SPOT-5 was modified on almost a monthly basis after March 2012. These modifications were explicitly incorporated into the SPOT-5 processing after March 2012. 10. The DORIS data arcs were editted, truncated or recast in places to eliminate large data gaps at the beginning, middle, and end of the arcs. 11. GOCO2S is now applied only to 150x150 instead of 180x180. 12. For the wd18 series (and all previous series) the DORIS data in GEODYN used a POD sigma of 2 mm/s. At the normal equation level all satellite contributions in any week had unit weight. This resulted in overly pessemistic sigmas for the weekly station adjustments. Here in the wd20 series, we reweight the normal equations based on 1.25 * the average RMS of fit (computed over all the arcs). So in wd20, the normal equation scale factors by satellite are: TOPEX 9.6898 SPOT-2 11.5398 SPOT-3 10.2811 SPOT-4 11.8906 SPOT-5 13.5913 ENVISAT 9.9986 CRYOSAT2 12.755 JASON-2 17.6356 With respect to wd18, we note that the following features remain part of wd20. 1. As with wd18: GEODYN now explicitly accounts for the DORIS beacon frequency changes at the DORIS sites from the nominal value reported in the DORIS2.2 files. 2. The macromodels for the DORIS satellites are as described for the wd18 series, and presented at the DORIS AWG meeting (Toulouse, April 2013) in the GSC Analysis Center Report, and have not been changed. 3. We use the DORIS CoM/Offset corrections supplied on the DORIS2.2 data. The Troposphere refraction Corrections rely on the GPT model for a priori meteorological data, and the GMF mapping function. Only a correction for the wet delay is adjusted on a pass-by-pass basis. 5. With the exception of C21, S21. The field to 4x4 is represented as a series of terms including secular rates, annual, and semiannual terms. These are derived from a fit to an SLR-DORIS weekly solutions for the time-variable gravity field of the Earth (1993-2012). (cf. Lemoine et al., 2011). 6. The annual variations in the geopotential (other than 4x4) to 20x20 are modelled from a multi-year average of solutions to GRACE data. #---------------------------------------------------------- 1. List of files submitted for 2013 SINEX files in Normal equation format. All files have 7 X and 7 Y EOP weekly parameters. wd20 series ( Spot5, Jason 2, Cryosat 2) NAME DATE No. of No. of Stations Coord parms Used Edited gsc13188wd20.snx 130707 141 47 3 gsc13195wd20.snx 130714 147 49 1 gsc13202wd20.snx 130721 141 47 2 gsc13209wd20.snx 130728 141 47 3 gsc13216wd20.snx 130804 132 44 4 gsc13223wd20.snx 130811 135 45 4 gsc13230wd20.snx 130818 138 46 3 gsc13237wd20.snx 130825 138 46 3 gsc13244wd20.snx 130901 132 44 4 gsc13251wd20.snx 130908 144 48 2 gsc13258wd20.snx 130915 141 47 4 gsc13265wd20.snx 130922 150 50 1 gsc13272wd20.snx 130929 144 48 3 2. POD summary of arcs used Satellite Orbit Modelling: 7 calendar arcs beginning on Sundays at 00:00:00 goco02s.fit gravity field (to 4x4) using c(2,1)&s(2,1) from IERS standards (Fit terms derived from a time series of solutions 1993 - 2012 derived using SLR & DORIS data.) goco02s gravity field (5x5 to 180x180) ITRF-2008/DPOD-2008 version 1.9 station coordinates GOT4.8 ocean tide model (20x20) with ocean loading Ocean pole tide MSIS atmospheric density model ECMWF 6hr atmospheric gravity (to 50x50) 10 deg elevation cutoff angle GMF (mapping function) w.Saastamoinen Troposphere Model and GPT for met data. External quaternion attitude data for Jason-2 only UCL model for Envisat radiation pressure modelling Solve combined normal equations for: 6 state parameters Drag (cd/2-hr, Envisat, SPOT4, SPOT5, Cryosat2); (cd/8-hr, Jason2) Drags for ENV, SP4, SP5, CS2 using time correlation of 2hrs. Once per revolution radial and cross track accelerations Troposphere & Range-rate biases (pass-by-pass) X and Y EOP with 1 meter constraint X, Y, Z station positions with 1 meter constraint Spot-5 START STOP NoDOR DORRMS(mm/sec) CR 130707 0000 0.00 130714 0000 0.00 65755 0.42880 1.0000 130714 0000 0.00 130721 0000 0.00 64118 0.42880 1.0000 130721 0000 0.00 130728 0000 0.00 64736 0.42300 1.0000 130728 0000 0.00 130804 0000 0.00 64810 0.41940 1.0000 130804 0000 0.00 130811 0000 0.00 64128 0.42740 1.0000 130811 0000 0.00 130815 1600 0.00 42931 0.42740 1.0000 130815 1800 0.00 130818 0000 0.00 21236 0.42660 1.0000 130818 0000 0.00 130825 0000 0.00 64646 0.42580 1.0000 130825 0000 0.00 130901 0000 0.00 64519 0.41940 1.0000 130901 0000 0.00 130908 0000 0.00 64648 0.42500 1.0000 130908 0000 0.00 130915 0000 0.00 62012 0.42860 1.0000 130915 0000 0.00 130922 0000 0.00 62675 0.41180 1.0000 130922 0000 0.00 130929 0000 0.00 63194 0.40180 1.0000 130929 0000 0.00 131006 0000 0.00 62037 0.41120 1.0000 Jason-2 START STOP NoDOR DORRMS(mm/sec) CR 130707 0000 0.00 130714 0000 0.00 127373 0.38600 0.9450 130714 0000 0.00 130721 0000 0.00 125682 0.38520 0.9450 130721 0000 0.00 130728 0000 0.00 121469 0.37880 0.9450 130728 0000 0.00 130804 0000 0.00 119857 0.37620 0.9450 130804 0000 0.00 130811 0000 0.00 119723 0.38520 0.9450 130811 1800 0.00 130818 0000 0.00 105066 0.37640 0.9450 130818 0000 0.00 130825 0000 0.00 120490 0.38660 0.9450 130825 0000 0.00 130901 0000 0.00 122653 0.38280 0.9450 130901 0000 0.00 130905 0800 0.00 75074 0.38120 0.9450 130911 0000 0.00 130915 0000 0.00 59903 0.37040 0.9450 130915 0000 0.00 130922 0000 0.00 125993 0.39380 0.9450 130922 0000 0.00 130929 0000 0.00 125171 0.39040 0.9450 130929 0000 0.00 131006 0000 0.00 125364 0.40240 0.9450 Cryosat-2 START STOP NoDOR DORRMS(mm/sec) CR 130707 0000 0.00 130714 0000 0.00 68885 0.40540 1.0000 130714 0000 0.00 130719 0400 0.00 49989 0.40460 1.0000 130719 0600 0.00 130721 0000 0.00 16768 0.40620 1.0000 130721 0000 0.00 130728 0000 0.00 51894 0.40400 1.0000 130728 0000 0.00 130804 0000 0.00 65451 0.39440 1.0000 130804 0000 0.00 130811 0000 0.00 65502 0.40420 1.0000 130811 0000 0.00 130815 1200 0.00 42155 0.40600 1.0000 130815 1400 0.00 130818 0000 0.00 22866 0.39460 1.0000 130818 0000 0.00 130825 0000 0.00 65527 0.40180 1.0000 130825 0000 0.00 130901 0000 0.00 65644 0.40160 1.0000 130901 0000 0.00 130903 2000 0.00 26683 0.40080 1.0000 130904 0000 0.00 130908 0000 0.00 37701 0.40040 1.0000 130908 0000 0.00 130915 0000 0.00 64840 0.41360 1.0000 130915 0000 0.00 130922 0000 0.00 66498 0.41040 1.0000 130922 0000 0.00 130929 0000 0.00 67018 0.40520 1.0000 130929 0000 0.00 131006 0000 0.00 67760 0.41480 1.0000 RMS of orbit differences: Doris only arc vs SLR/Doris arc (cm) radial cross along j2130707 0.29604 1.94074 2.02472 j2130714 0.27840 2.07828 1.12245 j2130721 0.33702 1.70387 1.30585 j2130728 0.31592 2.23356 1.21040 j2130804 0.29523 1.68631 1.33891 j2130811 0.39045 1.62909 1.66245 j2130818 0.45533 2.19341 1.94785 j2130825 0.32656 2.12108 1.45761 j2130901 0.28428 2.38253 1.11388 j2130911 0.34910 1.50714 1.33445 j2130915 0.47595 2.08925 2.30837 j2130922 0.36979 2.03931 1.63782 j2130929 0.33783 2.15428 1.68420 c2130707 0.19564 1.79714 6.01852 c2130714 0.16138 1.08782 5.83200 c2130719 0.23263 1.11359 6.12115 c2130721 0.31163 2.08025 4.53029 c2130728 0.20395 0.98677 4.05962 c2130804 0.16621 1.16256 3.86926 c2130811 0.20564 1.62843 4.49738 c2130815 0.21173 0.76137 5.16442 c2130818 0.23614 1.53619 5.16032 c2130825 0.14174 1.42604 2.78849 c2130901 0.21746 1.34415 4.70487 c2130904 0.20112 1.10966 4.89216 c2130908 0.19762 1.25368 4.53447 c2130915 0.16364 0.90061 4.31946 c2130922 0.20641 1.14512 4.93531 c2130929 0.53162 1.53201 4.26018 3. Contact information for questions Frank Lemoine, GSFC/NASA Greenbelt, MD USA frank.g.lemoine@nasa.gov Douglas Chinn, SGT Inc., Greenbelt MD USA douglas.s.chinn@nasa.gov References: Le Bail, K. et al., GSFC DORIS Contribution to ITRF2008, Advances in Space Research, 45 (2010) 1481-1499. Zelensky, N. et al., DORIS/SLR POD modelling improvements for Jason-1 and Jason-2, Advances in Space Research, 46 (2010) pp.1541-1558 4. Internal comparison: Inversion of weekly combined normal equation and comparison with reference (ITRF2008). Stations used in comparisons (when available) ADEA ADEB ADFB ADGB AJAB AMSA AMTB AMUB AMVB AREA AREB ARFB ARLA ARMA ASDB ASEB BADA BADB BELB BEMB BETB CACB CADB CHAB CIBB CICB CIDB COBB COLA CROB CRPB CRQB DAKA DIOA DIOB DJIA DJIB EASA EASB EVEB FAIA FAIB FLOA FUTB GALA GAVB GOLA GOMA GOMB GR3B GREB GRFB GUAB HBKA HBKB HBLA HBMB HELA HELB HEMB HUAA HVOA IQUB JIUB KERA KERB KESB KETB KITA KITB KIUB KOKA KOLB KRAB KRBB KRUB KRWB LIBA LIBB LICB LIFB MAHB MALB MANA MANB MARA MARB MATB META MEUB MIAB MONB MOOB MORA MORB MSOB MSPB NOUA NOUB NOWB NOXB ORRA ORRB OTTA OTTB PAPB PAQB PASB PATB PAUB PDLB PDMB PURA RAQB REUA REUB REYA REYB RIDA RIKB RILB RIMB RIOA RIOB RIPB RIQB RIRB ROTA ROTB ROUB ROVB SAKA SAKB SALB SAMB SANA SANB SAOB SRCB SODA SODB SPIA SPIB STJB SYOB SYPB TANB THUB TLHA TLSA TLSB TRIA TRIB WALA YARA YARB YASB YELA YELB YEMB WRMS, TX, TY, TZ, Scale in mm (with respect to the above reference station set) (Note: Stations with less than 300 points are never used. Other stations are edited if they cause a high adjustment.) Spot-5, Jason-2, Cryosat-2 solution Year Mon Day DOY No.of STA WRMS TX TY TZ Scale 2013 07 07 188 47 11.11 -13.01 -15.02 -20.26 5.82 2013 07 14 195 49 11.24 -5.61 -16.04 -10.32 5.39 2013 07 21 202 47 11.73 -8.10 -14.61 18.89 8.65 2013 07 28 209 47 11.48 -6.29 -17.50 5.29 10.21 2013 08 04 216 44 11.00 -3.14 -16.59 -5.79 6.92 2013 08 11 223 45 11.20 -7.93 -16.02 -14.46 6.72 2013 08 18 230 46 11.98 -7.77 -17.69 -22.06 5.47 2013 08 25 237 46 11.08 -5.84 -12.30 -16.05 4.93 2013 09 01 244 45 10.66 -0.92 -16.42 11.09 5.28 2013 09 08 251 48 11.96 -1.84 -14.44 -20.01 9.13 2013 09 15 258 47 11.86 4.04 -7.32 -11.26 6.15 2013 09 22 265 50 11.64 -0.87 -9.96 -1.61 8.50 2013 09 29 272 48 11.75 1.63 -11.12 -3.79 6.95 Cliquez sur l'url suivante https://www.mailcontrol.com/sr/OOYuLogVEPvGX2PQPOmvUmzIM3fP2nK!R6auImRnt0YolNSCd3yB6EQdZ4VrCThdCGxBe8Czi8yTKOxjbsImtQ== si ce message est indésirable (pourriel). 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