Technical description of solution bkg2007a_dsnx 1. Purpose of solution: 24 hour session solution for IVS time series of baseline lengths and basis solution for combination techniques 2 - Analysis Center: Federal Agency for Cartography and Geodesy (BKG Leipzig) and Geodetic Institute of the University of Bonn 3. Short narrative description of solution: All available dual-band Mark III/IV/V observations from 1984 on were analysed for this solution. The orientation of CRF is defined by fixing of the global estimated source coordinates RA, DEC of the BKG solution bkg00008. The TRF is defined by no-net-translation and rotation constraints for the coordinates of all sites in a VLBI session related to VTRF2003 except for BADARY, CTVASTJ, DSS65A, METSAHOV, ZELENCHK. The values of the official list of VLBI antenna axis offsets issued by the IVS Analysis Coordinator (update 20070516) were used (Appendix A). Mean pole coordinates used for computation of pole tide deformation were applied according to IERS Conventions 2003 (eq. 23a, 23b). The Vienna mapping function (VMF1) is applied for troposphere correction modeling. 4. Estimated parameters: a. celestial frame: No, except right ascension, declination for sources estimated as arc source parameters in BKG solution bkg00008 b. terrestrial frame: X, Y, Z c. Earth orientation: x, y, UT1-TAI, xdot, ydot, UT1dot, dpsi, deps d. zenith troposphere: 1h piece-wise linear functions, rate constraint generally 50 ps/hour, VMF1 wet partial derivative (segmented) e. troposphere gradient: east and north offset, offset constraint 0.5 mm, rate constraint 2.0 mm/day f. station clocks: 1h piece-wise linear functions, rate constraint generally 5.E-14 g. baseline clocks: set in initial analysis - usually used h. other: No 5. Celestial reference frame: a. a priori source positions: BKG solution bkg00008 b. source positions adjusted in solution: No, except used arc sources in BKG solution bkg00008 c. definition of orientation: fixed source coordinates of the BKG solution bkg00008 6 - Terrestrial reference frame: a. a priori station positions: VTRF2003 b. a priori station velocities: VTRF2003 c. reference epoch: 1997.0 d. station positions adjusted in solution: Yes e. definition of origin, orientation, and their time evolution: no-net-translation and no-net-rotation of position with respect to VTRF2003 for all stations of the VLBI session except BADARY, CTVASTJ, DSS65A, METSAHOV, ZELENCHK 7. Earth orientation: a. a priori precession model: IERS 2003 b. a priori nutation model: MHB2000 c. Short-period tidal variations in x, y, UT1: a priori short-period tidal variations in x, y, UT1 were taken into account in accordance with the model presented in Appendix B. d. EOP estimation: x, xdot, y, ydot, UT1-TAI, UT1dot, dpsi, deps each session for the middle epoch of it 8. A priori geophysical models: a. troposphere: hydrostatic component with VMF1 mapping function b. solid Earth tide: IERS Conventions c. ocean loading: GOT00 model d. atmosphere loading: none 9. Data type: Group delays 10. Data editing: 5 deg elevation cutoff, editing of outliers during adjustment when necessary. 11. Data weighting: Observations are weighted using std reported in observational files; re-weighting iteration for each session to achieve the chi-square unity. 12. Standard errors reported: Reported formal errors are derived from least-squares estimation propagated from data uncertainties and weighted as discussed in #11. 13 Software: Calc 10, SOLVE release: 2006.12.15 Appendix A. ----------- The official list of VLBI antenna axis offsets issued by the IVS Analysis Coordinator $$ IVS VLBI Antenna Axis Offsets, Status May 16, 2007 $$ 070515 Format and units changed to match Solve flyby format $$ 051220 BADARY and ZELENCHK added $$ 050111 URUMQI, MIAMI20, MIZNAO10, OVRO 130 recommended to set to zero. $$ 050106 HOBART26 measured locally by John Dawson $$ $$ Data Format: $$ $$ Field 1:8 A8 IVS station name $$ Field 11:17 blank $$ Field 22:28 F7.4 offset in meters $$ Field 33:38 F6.4 Formal uncertainty of the estimate from VLBI solution $$ or from measurements in meters. May be empty if value $$ is not available $$ Field 40:79 A40 Comment $$ $$ $$ --------------------------------------------------- $$ Axis offsets as measured locally with high accuracy $$ --------------------------------------------------- $$ $$ BADARY and ZELENCHK reported by Zinovy Malkin, Dec. 20, 2005, $$ from geodetic measurements in Nov-Dec 2005 $$ CRIMEA, -1.8 +- 0.2 mm measured by Samoilenko 1994. $$ Samoilenko A.N. (1996): Local geodetic network at Simeiz $$ geodynamical test area (in Russian), Preprint GAO-96-1P, Kiev $$ EFLSBERG measured by Miebach/Werntgen, Bonn, 1980 $$ HARTRAO reported by Ludwig Combrinck: Conventional survey 1993 $$ (6695 +- 3 mm) and GPS survey 1995 (6695.6 +- 2.3 mm) $$ HOBART26 reported by John Dawson via Oleg Titov, 2005 $$ MEDICINA reported by Pierguido Sarti, 2004 $$ NYALES20 published by Steinforth et al. (2003) 16th Working Meeting $$ on European VLBI, 524.2 +- 0.2 mm $$ ONSALA60 published by Eschelbach & Haas (2003) 16th Working Meeting $$ on European VLBI, -6.0 +- 0.4 mm (negative sign corrected) $$ OHIGGINS reported by Andreas Reinhold/Gerald Engelhardt BKG, 2004, $$ on the basis of local measurements $$ TIGOCONC reported by Hayo Hase BKG, 2004 on the basis of local measurements $$ TIGOWTZL reported by Hayo Hase BKG, 2004 on the basis of local measurements $$ WETTZELL confirmed through several local measurements, reported $$ by W. Schlueter $$ $$ offset sigma BADARY 0.0025 0.0005 CRIMEA -0.0018 0.0002 EFLSBERG 0.0103 0.0010 HARTRAO 6.6953 0.0023 HOBART26 8.1913 0.0015 MEDICINA 1.8301 0.9999 error unknown NYALES20 0.5242 0.0002 ONSALA60 -0.0060 0.0004 OHIGGINS 0.0000 0.9999 error unknown TIGOCONC 0.0000 0.0003 TIGOWTZL 0.0000 0.0003 WETTZELL 0.0000 0.0001 ZELENCHK -0.0115 0.0005 $$ $$ $$ $$ -------------------------------------- $$ Axis offsets still under investigation $$ -------------------------------------- $$ $$ The following are axis offsets which have been estimated by $$ Leonid Petrov, GSFC. A couple of entries have been corrected manually $$ when identical antennas had various names, e.g. NRAO85 3 -> LEFT85 3, etc. $$ N.B.: In cases where axis offsets have been measured accurately it has $$ happened that the (test) estimates were way off the measured values. $$ So, handle these estimates with care. They are only valid until offsets $$ have been measured locally. $$ Nevertheless, in the absence of more reliable figures these are the $$ recommended values. $$ $$ offset sigma AIRA -0.0126 -+ 0.0022 ALASKANO 7.2850 -+ 0.0001 ALGOPARK 0.0014 -+ 0.0004 ATCA_014 0.0000 AUSTINTX 0.0000 AZORES 0.0000 BERMUDA 0.0000 BLKBUTTE 0.0000 BLOOMIND 0.0000 BR-VLBA 2.1306 -+ 0.0003 BREST 0.0000 CARNUSTY 0.0000 CARROLGA 0.0000 CEDUNA 0.0000 CHICHI10 -0.0025 -+ 0.0023 CHLBOLTN 0.3060 CTVASBAY 0.0000 CTVASTJ 0.0011 -+ 0.0048 DAITO 0.0000 DEADMANL 0.0000 DSS13 0.0000 DSS15 -0.0039 -+ 0.0015 DSS45 -0.0013 -+ 0.0018 DSS65 -0.0026 -+ 0.0009 DSS65A -0.0026 -+ 0.0009 ELY 0.0000 FD-VLBA 2.1324 -+ 0.0003 FLAGSTAF 0.0000 FORT ORD 0.0000 FORTLEZA 0.0060 -+ 0.0006 FORTORDS 0.0000 FTD 7900 0.0000 GBT-VLBA -0.0883 -+ 0.0066 GGAO7108 -0.0021 -+ 0.0024 GIFU11 -0.0072 -+ 0.0036 GIFU3 0.0000 GILCREEK 7.2850 -+ 0.0001 GOLDECHO 6.7060 GOLDMARS 0.0000 GOLDVENU 0.9295 -+ 0.0060 GORF7102 0.0000 GRASSE 0.0000 HALEAKAL 0.0000 HATCREEK -0.0097 -+ 0.0011 HAYSTACK 0.0000 -+ 0.0014 HN-VLBA 2.1295 -+ 0.0004 HOFN 0.0000 HOHENFRG 0.0000 HOHNBERG 0.0000 HRAS 085 6.7007 -+ 0.0006 JPL MV1 0.0000 KAINAN 0.0000 KALYAZIN 2.2000 KANOZAN 0.0000 KARLBURG 0.0000 KASHIM11 0.0013 -+ 0.0023 KASHIM34 -0.0090 -+ 0.0014 KASHIMA -0.0023 -+ 0.0011 KAUAI 2.4350 -+ 0.0005 KIRSBERG 0.0000 KODIAK 0.0000 KOGANEI 0.0077 -+ 0.0023 KOGANEI3 0.0000 KOKEE 0.5182 -+ 0.0003 KP-VLBA 2.1327 -+ 0.0003 KWAJAL26 0.0000 LA-VLBA 2.1329 -+ 0.0003 LEFT85 1 6.7074 -+ 0.0058 LEFT85 3 6.7076 -+ 0.0003 LEFTKOK 0.5182 -+ 0.0003 LEONRDOK 0.0000 MADRID64 0.0000 MAMMOTHL 0.0000 MARCUS 0.0000 MARPOINT 6.6887 -+ 0.0042 MATERA -0.0038 -+ 0.0004 MCD 7850 0.0000 METSAHOV 0.0051 -+ 0.0037 METSHOVI 0.0000 MIAMI20 0.0068 -+ 0.0050 MILESMON 0.0000 MIURA 0.0065 -+ 0.0024 MIYAZAKI 0.0000 MIZNAO10 -0.0013 -+ 0.0068 MIZUSGSI 0.0000 MK-VLBA 2.1343 -+ 0.0005 MOJ 7288 0.0000 MOJAVE12 -0.0031 -+ 0.0003 MOJAVLBA 0.0000 MON PEAK 0.0000 MOPRA 7.0000 MV2ONSLA 0.0000 NL-VLBA 2.1296 -+ 0.0003 NOBEY 6M 0.0000 NOBEYAMA 0.0000 NOME 0.0000 NOTO 1.8310 -+ 0.0009 NOTOX 1.8310 -+ 0.0009 NRAO 140 14.9398 -+ 0.0011 NRAO20 0.5091 -+ 0.0004 NRAO85 1 6.7074 -+ 0.0058 NRAO85 3 6.7076 -+ 0.0003 OCOTILLO 0.0000 ONSALA85 2.1500 OV-VLBA 2.1323 -+ 0.0003 OVR 7853 0.0000 OVRO 130 0.0106 -+ 0.0022 OVRO 90 0.0000 PARKES -0.0310 -+ 0.0089 PBLOSSOM 0.0000 PENTICTN 0.0000 PIETOWN 2.1377 -+ 0.0003 PINFLATS 0.0000 PLATTVIL 0.0000 PRESIDIO 0.0000 PT REYES 0.0000 PVERDES 0.0000 QUINCY 0.0000 RICHMOND 5.1822 -+ 0.0005 ROBLED32 6.7060 SAGARA 0.0000 SANPAULA 0.0000 SANTIA12 0.0023 -+ 0.0013 SC-VLBA 2.1337 -+ 0.0006 SEATTLE1 0.0000 SESHAN25 0.0001 -+ 0.0012 SEST 0.0000 SHANGHAI 1.1170 SINTOTU 0.0000 SINTOTU3 -0.0030 -+ 0.0054 SNDPOINT 0.0000 SOURDOGH 0.0000 SUWON 0.0000 SVETLOE -0.0096 -+ 0.0007 SYOWA -0.0056 -+ 0.0079 TATEYAMA 0.0069 -+ 0.0024 TIDBIN64 0.0000 TITIJIMA 0.0000 TOMAKO11 -0.0004 -+ 0.0083 TOULOUSE 0.0000 TROMSONO 0.0000 TRYSILNO 0.0000 TSUKU3 0.0000 TSUKUB32 0.0006 -+ 0.0005 TSUKUBA 0.0000 URUMQI -0.0057 -+ 0.0020 USSURISK 4.0000 USUDA64 0.0000 VANDENBG 0.0000 VERAIRIK 0.0000 VERAISGK 0.0000 VERAMZSW -0.0108 -+ 0.0038 VERAOGSW 0.0000 VERNAL 0.0000 VICTORIA 0.0000 VLA 0.0000 VLA-N8 0.0000 VLBA85 3 6.7076 -+ 0.0003 VNDNBERG -0.0029 -+ 0.0019 WESTFORD 0.3163 -+ 0.0002 WHTHORSE 0.0000 WIDE85 3 6.7076 -+ 0.0003 YAKATAGA 0.0000 YAMAGUCH 0.0000 YEBES -0.0005 -+ 0.0028 YELLOWKN 0.0000 YLOW7296 0.0070 -+ 0.0024 YUMA -0.0179 -+ 0.0097 ---------------------------------------- Appendix B. ----------- A priori short-period tidal variations in polar motion and UT1. (GSFC hf1102a.txt) UT1 tidal terms (microseconds) l l' F D Om GST | Cos | Sin | +pi | | | ----------------------------------------- 2 0 2 0 2 -1 -.13 -1.24 0 0 2 2 2 -1 .19 -.82 1 0 2 0 1 -1 -.50 -.92 1 0 2 0 2 -1 -2.64 -4.90 -1 0 2 2 2 -1 -1.10 -.77 0 0 2 0 1 -1 -2.51 -3.34 0 0 2 0 2 -1 -13.31 -17.72 -1 0 2 0 2 -1 .34 .63 1 0 0 0 0 -1 .48 .77 0 1 2 -2 2 -1 -.21 -.43 0 0 2 -2 2 -1 -3.20 -5.32 0 1 0 0 0 -1 .50 1.89 0 0 0 0 -1 -1 -.19 -.33 0 0 0 0 0 -1 9.83 16.45 0 0 0 0 1 -1 1.33 2.23 0 -1 0 0 0 -1 -.17 .41 0 0 -2 2 -2 -1 .08 -.04 -1 0 0 0 0 -1 .13 1.25 0 0 -2 0 -2 -1 .68 .33 0 0 -2 0 -1 -1 .44 .21 -1 0 -2 0 -2 -1 .18 .75 -1 0 -2 0 -1 -1 .12 .48 2 0 2 0 2 -2 -.30 .61 0 0 2 2 2 -2 -.83 .47 1 0 2 0 2 -2 -1.94 3.13 -1 0 2 2 2 -2 -.19 .67 0 0 2 0 1 -2 .37 -.57 0 0 2 0 2 -2 -9.88 15.37 -1 0 2 0 2 -2 .12 -.34 0 1 2 -2 2 -2 -.06 .17 0 0 2 -2 2 -2 -1.25 7.73 0 1 0 0 0 -2 .24 .27 0 0 0 0 0 -2 .28 2.48 0 0 0 0 1 -2 .08 .74 0 0 3 0 3 -3 .24 .03 0 0 0 4 1 -1 .26 .10 1 0 4 -2 2 -1 .43 -.52 0 0 0 1 0 -1 -.29 -.23 3 -1 2 0 2 -2 .14 .00 1 1 2 0 1 -2 -.26 -.40 0 0 0 -2 2 -2 .23 .09 ----------------------------------------- Polar motion tidal terms (microarcseconds) l l' F D Om GST | Cos | Sin | +pi | | | ----------------------------------------- -2 0 -2 0 -2 1 -6.90 5.52 0 0 -2 -2 -2 1 -8.63 3.00 -1 0 -2 0 -1 1 -5.58 1.48 -1 0 -2 0 -2 1 -29.56 7.83 1 0 -2 -2 -2 1 -7.86 3.64 0 0 -2 0 -1 1 -25.03 8.53 0 0 -2 0 -2 1 -132.70 45.21 1 0 -2 0 -2 1 2.59 .60 -1 0 0 0 0 1 3.26 -8.76 0 -1 -2 2 -2 1 1.25 9.68 0 0 -2 2 -2 1 -49.40 19.23 0 -1 0 0 0 1 25.06 6.71 0 0 0 0 1 1 -3.09 1.76 0 0 0 0 0 1 156.21 -88.75 0 0 0 0 -1 1 21.18 -12.04 0 1 0 0 0 1 4.99 .50 0 0 2 -2 2 1 3.25 2.62 1 0 0 0 0 1 .51 -4.99 0 0 2 0 2 1 5.93 -10.38 0 0 2 0 1 1 3.80 -6.65 1 0 2 0 2 1 .46 .59 1 0 2 0 1 1 .30 .37 -2 0 -2 0 -2 2 4.13 -.28 0 0 -2 -2 -2 2 -1.37 .40 -1 0 -2 0 -2 2 10.48 -12.69 1 0 -2 -2 -2 2 4.33 1.81 0 0 -2 0 -1 2 -1.06 2.12 0 0 -2 0 -2 2 28.34 -56.83 1 0 -2 0 -2 2 1.92 .54 0 -1 -2 2 -2 2 5.42 -4.28 0 0 -2 2 -2 2 -.48 -20.16 0 -1 0 0 0 2 2.61 1.85 0 0 0 0 0 2 -.83 -18.26 0 0 0 0 -1 2 -.25 -5.44 0 0 -3 0 -3 3 1.92 -1.16 0 0 0 -4 -1 1 5.23 -1.47 -1 0 -4 2 -2 1 -1.28 -3.62 0 0 0 -1 0 1 2.33 -2.61 -3 1 -2 0 -2 2 -.88 -1.13 -1 -1 -2 0 -1 2 .24 .00 0 0 0 2 -2 2 .05 -1.31 2 0 2 0 2 -2 2.33 7.19 0 0 2 2 2 -2 2.87 7.66 1 0 2 0 2 -2 .59 43.62 -1 0 2 2 2 -2 -3.07 8.30 0 0 2 0 1 -2 .50 -9.59 0 0 2 0 2 -2 -13.37 257.07 -1 0 2 0 2 -2 1.83 -7.67 0 1 2 -2 2 -2 -7.08 .33 0 0 2 -2 2 -2 -72.53 106.95 0 1 0 0 0 -2 .34 -4.29 0 0 0 0 0 -2 -18.74 12.64 0 0 0 0 1 -2 -5.59 3.77 0 0 3 0 3 -3 -.56 -1.57 3 -1 2 0 2 -2 -.98 4.60 1 1 2 0 1 -2 -.62 4.28 0 0 0 -2 2 -2 -.83 2.72 -----------------------------------------