Technical description of session EOP extended from solution GSFC1122 1. Purpose of solution: session EOP from GSFC1122 TRF/CRF 2. Analysis center: GSFC 3. Short narrative description of solution: Session EOP values are estimated using the TRF/CRF of GSFC1122. The full covariance of the GSFC1122 station and source parameters is incremented with the data from a single new session. Arc parameters for EOP/nutation as well as troposphere zenith values, gradients, clocks and baseline clocks (as necessary) are estimated for the new session. The EOP and nutation time series include both sessions used in creating the TRF/CRF of GSFC1122 and sessions analyzed subsequently. Note that this submission represents a change from the original 1122 submission first made in 1999. On 3/8/2000, the eop epoch was changed from the mid-point of the session to the first 0 hour epoch in the session. Also, on 5/15/2000, session names (e.g., $99APR15XA) were appended to the lines in the statistics file. This distinguishes between same-day sessions, which could be identified by the epoch printed in the statistics file when the mid-point epoch was used but can no longer be identified now that the first 0 hour epoch is used. 4. Estimated parameters: a. celestial frame: right ascension, declination b. terrestrial frame: X, Y, Z, Xdot, Ydot, Zdot c. Earth orientation: x, y, UT1-TAI, UT1dot, dpsi, deps d. zenith troposphere: continuous piecewise linear, 20 min interval rate constraint generally 50 ps/hr NMF wet partial derivative e. troposphere gradient: 6hr east and north piecewise continuous at nonmobile stations offset constraint 0.5 mm, rate 2.0 mm/day f. station clocks: quadratic + continuous piecewise linear with 1 hr interval rate constraint generally 5 E-14 g. baseline clocks: set in initial analysis - usually used h. other: global antenna axis offsets for nonmobile stations 5. Celestial reference frame: a. a priori source positions: ICRF b. source positions adjusted in solution: yes If yes, c. definition of orientation: no-net-rotation tie to the ICRF using only the ICRF defining sources d. source position estimation: all global 6 - Terrestrial reference frame: a. a priori station positions: ITRF97 b. a priori station velocities: NUVEL1-A NNR c. reference epoch: 1997.0 d. station positions/velocities adjusted in solution: yes If yes, e. definition of origin, orientation, and their time evolution: no-net-translation and no-net-rotation of position for: GILCREEK WETTZELL LA-VLBA NRAO20 NYALES20 KOKEE MK-VLBA HARTRAO FORTLEZA HOBART26 KASHIMA DSS45 no-net-translation and no-net-rotation of velocity for: WESTFORD RICHMOND WETTZELL HOBART26 DSS45 f. station parameter estimation: X, Y, Z, Xdot, Ydot, Zdot globally for all stations, some with constraints g. stations with constraints: A priori rate errors of 0, 3, and 3 mm/yr for U, E, and N respectively but because the following stations generally have only one occupation, their velocities follow NUVEL1-A NNR. AUSTINTX AZORES BERMUDA BLOOMIND BREST CARNUSTY CARROLGA CHLBOLTN DAITO GRASSE HOFN HOHENFRG HOHNBERG KARLBURG KIRSBERG LEONRDOK METSHOVI MILESMON MIYAZAKI MIZNAO10 MIZUSGSI OCOTILLO SAGARA SEST SINTOTU TITIJIMA TOULOUSE USSURISK USUDA64 VICTORIA VLA MCD_7850 FTD_7900 The velocities of the following pairs of stations are constrained to be the same. DSS65 ROBLED32 SESHAN25 SHANGHAI DSS45 TIDBIN64 FORT_ORD FORTORDS MOJAVE12 MOJ_7288 OVRO_130 OVR_7853 ONSALA60 MV2ONSLA NRAO_140 NRAO85_1 KAUAI HALEAKAL YELLOWKN YLOW7296 GORF7102 GGAO7108 WETTZELL TIGOWTZL RICHMOND MIAMI20 TSUKUBA TSUKUB32 h. stations with discontinuous positions and date of discontinuity: YAKATAGA 871201 SOURDOGH 871201 WHTHORSE 871201 FORTORDS 891001 PRESIDIO 891001 NRAO85 3 901201 MOJAVE12 920627 DSS15 920627 MEDICINA 960601 EFLSBERG 961001 DSS65 970415 TSUKUB32 990401 i. stations with nonlinear velocities: HRAS 085 - 2 month piecewise linear, continuous position j. relativity scale: LE : local Earth in agreement with TCG (IUGG Resolution) k. permanent tide correction: yes "Yes" means that both the permanent and the periodic tides have been modeled, so that the output station position is after the removal of both the permanent and the periodic tidal effect. 7. Earth orientation: a. a priori precession model: IAU(1976) b. a priori nutation model: IAU(1980) c. a priori short-period tidal variations in x, y, UT1: 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 ----------------------------------------- d. EOP estimation: x, y, UT1, UT1dot, deps, dpsi each day. deps, dpsi are with respect to the standard IAU precession/nutation models 8. A priori geophysical models: a. troposphere: NMF dry mapping function; Sastamoinen zenith delay calculated using logged pressure, temperature; a priori mean gradients from VLBI data or DAO weather model b. solid Earth tide: IERS Conventions c. ocean loading: IERS Conventions d. atmosphere loading: using site pressure admittances estimated from VLBI data or computed from convolution of loading Green's function with NMC weather model data 9. Data type: delays 10. Data editing: 7 deg elevation cutoff 11. Data weighting: reweighting by station for each session such that the additional RSSed noise makes the chi-square unity in a single session solution 12. Standard errors reported: all errors derived from least-squares estimation propagated from a priori data uncertainties from fringing, ionosphere calibration error and noise RSSed for each station for each session and taking into account the constraints applied to troposphere, clock and EOP parameters 13 Software: CALC 8.2, SOLVE 5.0129 14. Other information: EOP are estimated at first 0 hour epoch in session. Nutation offsets deps, dpsi are with respect to the standard IAU nutation and precession models. The session types are identified as follows: 1. IRIS-A network 2. IRIS-P Pacific network 3. IRIS-S southern network, includes some IRIS-A stations and HARTRAO 4. CDP fixed station sessions 5. All CDP and NGS mobile sessions 6. NAVNET 7. All non-mobile, non-IRIS NGS experiments 8. Early USNO network 10. POLARIS 11. NRL celestial reference frame 13. NAVEX 14. NEOS-A 15. Transasia sessions sponsored by the Geodetic Institute of the University of Bonn 17. Sessions exclusively utilizing VLBA antennas 18. NEOS-B 19. Japanese sessions from GSI 20. Japanese sessions from CRL 21. NASA Space Geodesy Program 22. Sessions scheduled by adding a European mobile site to a regularly scheduled IRIS-A 23. Other sessions involving a European mobile site 28. NEOS celestial reference frame 29. Asia Pacific Telescope ********************************************************************