CONT08 - First Results and High-Frequency Earth Rotation
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1 . EVGA-Meeting 29 (Bordeaux) CONT8 - First Results and High-Frequency Earth Rotation 1 Thomas Artz Sarah Böckmann Axel Nothnagel Institut of Geodesy and Geoinformation University of Bonn March 24, 29
2 CONT8 2 photo: h sessions from -24 UT 11 globally distributed VLBI-Telescopes modified scheduling w.r.t. prior CONT-Campaigns
3 Network Ny Alesund Westford Onsala Medicina Svetloe Wettzell Zelenchukskaya Tsukuba 3 Kokee Park TIGO Conception Hartebeesthoek
4 Schedules based on the best 8 sources less than 15% non-detection in R1 and R4 sessions in first half of 28 2h slots for system checks (3 min) 4
5 Schedules CONT2 & CONT5 system checks for all stations in last 3 min of session. 4
6 Number of observations 5 TIGOCONC missed 3 sessions several interruptions ZELENCHK missed 1 session (disk lost) bi-modal pattern, sub-lobes, sub-ambiguities
7 Number of observations 5 TIGOCONC missed 3 sessions several interruptions ZELENCHK missed 1 session (disk lost) bi-modal pattern, sub-lobes, sub-ambiguities
8 Solution setup Parameterization daily or CPWL (6 min) PM and UT1 2 nd degree polynomial and 6 min CPWL clocks 2 min zenith wet delay, 12h gradients (NS and EW) Modelling a priori EOP: USNO finals / IAU2A + VLBI estimates subdaily variations in ERP: IERS23 model ocean loading: FES24 mapping function: VMF1 thermal expansion applied atmospheric pressure loading applied 6
9 Solution setup Parameterization daily or CPWL (6 min) PM and UT1 2 nd degree polynomial and 6 min CPWL clocks 2 min zenith wet delay, 12h gradients (NS and EW) Modelling a priori EOP: USNO finals / IAU2A + VLBI estimates subdaily variations in ERP: IERS23 model ocean loading: FES24 3 solutions mapping function: VMF1 station position time-series thermal expansion applied EOP time-series with daily resolution atmospheric pressure loading applied EOP time-series with hourly resolution 6
10 Solution strategy - Stacking Equation system A x = τ 7
11 Solution strategy - Stacking Equation system A x = τ 7
12 Solution strategy - Stacking Equation system A x = τ 7
13 Solution strategy - Stacking Equation system A x = τ 7 Parameter with same epoch although in different sessions CPWLF at end and beginning of subsequent sessions parameter transformed to mid epoch of CONT-period station positions (EOP solution only)
14 UT1-TAI Station position repeatabilities x WRMS [mm] y WRMS [mm] z WRMS [mm] CONT2 CONT5 CONT8 HARTRAO HARTRAO HARTRAO KOKEE KOKEE KOKEE MEDICINA MEDICINA MEDICINA NYALES2 NYALES2 NYALES2 ONSALA6 ONSALA6 ONSALA6 SVETLOE SVETLOE SVETLOE TIGOCONC TIGOCONC TIGOCONC TSUKUB32 TSUKUB32 TSUKUB32 WESTFORD WESTFORD WESTFORD WETTZELL WETTZELL WETTZELL ZELENCHK ZELENCHK ZELENCHK in general: improvement KOKEE worse 8
15 EOP with daily resolution UT1-TAI Repeatabilities: PM w.r.t. IGS / dut w.r.t. USNO finals CONT2 CONT5 CONT8 9 8 WRMS [µas] X pole Y pole UT1-TAI
16 EOP with sub-daily resolution CONT5 - X pole w.r.t. IGS X pole offset [mas] MJD 1 CONT8 - X pole w.r.t. IGS X pole offset [mas] MJD Improved session boundaries due to modified schedule
17 EOP with sub-daily resolution CONT5 - X pole w.r.t. IGS X pole offset [mas] MJD 11 CONT8 - X pole w.r.t. IGS X pole offset [mas] MJD Further consistency due to stacking
18 WRMS w.r.t. reference solutions Repeatabilities: PM w.r.t. IGS / dut w.r.t. USNO finals CONT2 CONT5 CONT8 25 UT1-TAI 2 12 WRMS [µas] X pole Y pole UT1-TAI
19 Spectral analysis - Polar Motion amplitude [mas] amplitude [mas] amplitude [mas] CONT2 CONT5 CONT cycles [h] UT1-TAI cycles [h] cycles [h] 13
20 Spectral analysis - Polar Motion amplitude [mas] amplitude [mas] amplitude [mas] CONT2 CONT5 CONT cycles [h] 8h signal from CONT2 not confirmed UT1-TAI cycles [h] cycles [h] 13
21 Spectral analysis - dut amplitude [µs] amplitude [µs] periods [h] periods [h] amplitude [µs] UT1-TAI CONT2 CONT5 CONT8 periods [h]
22 Conclusions 1 Modified solution strategy improves solution (based on WRMS) 2 CONT8 serves (one of) the best continous data-sets occasional (planned or unplanned) drop of stations do not lead to jumps in the time series 3 No significant signal in CONT8 sub-daily EOP (as the retrograde 8h term in CONT2) 15
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