Technical description of solution bkg00007.eops 1. Purpose of solution: Session EOP 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 Mark III/IV/V sessions from 1984 were analysed for this solution except one baseline and small network sessions which are not suitable for reliable EOP determination. The orientation of CRF is defined by no-net-rotation constraints for 212 defining sources related to the ICRF-Ext.1 catalogue. The TRF is defined by no-net-translation and rotation constraints for the coordinates and velocities of 26 sites related to VTRF2003. The values of the official list of VLBI antenna axis offsets issued by the IVS Analysis Coordinator (update 20050106) were used (Appendix A). 4. Estimated parameters: a. celestial frame: right ascension, declination b. terrestrial frame: X, Y, Z, Xdot, Ydot, Zdot and coordinates series of stations SVETLOE, TIGOCONC, CTVASTJ estimated in respective session 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 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: ICRF-Ext.1 b. source positions adjusted in solution: Yes c. definition of orientation: no-net-rotation of sources with respect to ICRF-Ext.1 for 212 defining sources marked in the ITRF-Ext.1 catalogue 6 - Terrestrial reference frame: a. a priori station positions: VTRF2003 b. a priori station velocities: VTRF2003 c. reference epoch: 1997.0 d. definition of origin, orientation, and their time evolution: no-net-translation and no-net-rotation of position with respect to VTRF2003 for 26 stations: ALGOPARK BR-VLBA DSS45 FD-VLBA FORTLEZA HARTRAO HOBART26 KASHIM34 KASHIMA KAUAI KOKEE LA-VLBA MATERA MK-VLBA NL-VLBA NOTO NRAO20 NRAO85_3 NYALES20 ONSALA60 RICHMOND SANTIA12 SC-VLBA SESHAN25 WESTFORD WETTZELL no-net-translation and no-net-rotation of velocity with respect to VTRF2003 for the same 26 stations: ALGOPARK BR-VLBA DSS45 FD-VLBA FORTLEZA HARTRAO HOBART26 KASHIM34 KASHIMA KAUAI KOKEE LA-VLBA MATERA MK-VLBA NL-VLBA NOTO NRAO20 NRAO85_3 NYALES20 ONSALA60 RICHMOND SANTIA12 SC-VLBA SESHAN25 WESTFORD WETTZELL 7. Earth orientation: a. a priori precession model: IERS 1996 b. a priori nutation model: IERS 1996 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 NMF mapping function b. solid Earth tide: IERS Conventions c. ocean loading: IERS Conventions 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 9.12, SOLVE release: 2004.03.18 14. Other information: Field 18 contains the session code Field 19 contains the duration of experiments Appendix A. ----------- The official list of VLBI antenna axis offsets Issued by the IVS Analysis Coordinator all values in mm last update: 20050106 UTC $$ $$ Axis offsets as measured locally with high accuracy $$ $$ CRIMEA, source unknown, -1.8 +- 0.2 reported by Dan MacMillan, 2004 $$ EFLSBERG measured by Miebach/Werntgen, Bonn, 1980 $$ HARTRAO reported by Ludwig Combrinck: Conventional survey 1993 $$ (6695 +- 3 mm) and GPS survey 1995 (6695.6 +- 2.3 mm) $$ HOBART26 measured by John Dawson, mail from A.Nothnagel 2005/01/06 $$ MEDICINA reported by Pierguido Sarti, 2004 $$ 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 $$ by W. Schlueter $$ $$ offset sigma CRIMEA -1.8 0.2 mm EFLSBERG 10.3 1.0 mm HARTRAO 6695.3 2.3 HOBART26 8191.3 1.5 mm MEDICINA 1830.1 NYALES20 524.2 0.2 mm ONSALA60 -6.0 0.4 mm OHIGGINS 0.0 TIGOCONC 0.0 0.3 mm TIGOWTZL 0.0 0.3 mm WETTZELL 0.0 0.1 mm $$ $$ $$ $$ Axis offsets still under investigation $$ -------------------------------------- $$ $$ The following are axis offsets which have been estimated by two $$ groups, GSFC (Dan MacMillan) and BKG (Gerald Engelhardt). The values $$ listed here are the weighted means. $$ N.B.: In cases where axis offsets have been measured accurately it has $$ 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. $$ $$ offset sigma ALGOPARK 1.29 0.32 BR-VLBA 2131.45 0.23 DSS15 -3.91 1.24 DSS45 -4.05 1.28 DSS65 -2.03 0.70 FD-VLBA 2132.02 0.22 FORTLEZA 6.37 0.52 GILCREEK 7290.23 0.08 GOLDVENU 929.47 4.46 HATCREEK -11.71 1.12 HAYSTACK -2.03 0.99 HN-VLBA 2129.50 0.27 HRAS 085 6701.82 0.44 KASHIM34 -11.86 1.31 KASHIMA -4.79 0.88 KAUAI 2436.41 0.40 KOKEE 520.81 0.28 KP-VLBA 2131.97 0.22 LA-VLBA 2132.75 0.19 MARPOINT 6695.92 3.22 MATERA -5.00 0.35 MK-VLBA 2135.03 0.34 MOJAVE12 -3.29 0.21 NL-VLBA 2129.19 0.21 NOTO 1830.78 0.76 NRAO 140 14950.11 0.73 NRAO20 508.99 0.30 NRAO85 3 6711.77 0.25 OV-VLBA 2131.88 0.22 PIETOWN 2137.18 0.20 RICHMOND 5184.14 0.41 SANTIA12 -0.04 1.01 SC-VLBA 2133.46 0.43 SESHAN25 3.43 1.10 SVETLOE -12.53 1.67 TSUKUB32 0.01 0.52 WESTFORD 316.75 0.18 YEBES -1.61 2.07 ---------------------------------------- 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 -----------------------------------------