Further Studies on the Influence of Range Biases - NASA€¦ · ILRS Workshop, Canberra ׀Nov 5-9,...
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Further Studies on the Influence of Range Biases Daniel Koenig (1), Ulrich Meyer (2), Daniela Thaller (1) (1) BKG (2) AIUB
Transcript of Further Studies on the Influence of Range Biases - NASA€¦ · ILRS Workshop, Canberra ׀Nov 5-9,...
Further Studies on the Influence of Range Biases
Daniel Koenig (1), Ulrich Meyer (2), Daniela Thaller (1)
(1) BKG
(2) AIUB
ILRS Workshop, Canberra ׀ Nov 5-9, 2018 ׀ Page 2
Background
• ILRS Pilot Project
„Station Systematic Error Monitoring“ (SSEM)
• Influence of additional Range Biases (RB) to be tested
• Idea:- absorbing systematic errors of laser device
- improving TRF parameters
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Characteristics of Test Cases
Test Case LC LS LS_E0 LS_EC
Time span 2000-2017
Satellites LAGEOS LAGEOS+Etalon
Range Biases
• LAGEOS combined per satellite per satellite per satellite
• Etalon - - - combined
Datum NNR/core stations
A priori TRF ITRF2014
A priori EOP C04_14
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Range Biases: Time Series 7080 McDonald
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Range Biases: Times Series 7090 Yarragadee
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Range Biases: Time Series 7105 Greenbelt
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Range Biases: Time Series 7110 Monument Peak
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Range Biases: Time Series
7210 Haleakala 7119 Haleakala
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Range Biases: Time Series 7237 Changchun
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Range Biases: Time Series 7403 Arequipa
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Range Biases: Time Series 7501 Hartebeesthoek
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Range Biases: Time Series 7810 Zimmerwald
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Range Biases: Time Series
7825 Mt. Stromlo7849 Mt. Stromlo
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Range Biases: Time Series 7832 Riyadh
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Range Biases: Time Series 7835 Grasse
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Range Biases: Time Series7841 Potsdam7836 Potsdam
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Range Biases: Time Series 7837 Shanghai
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Range Biases: Time Series 7839 Graz
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Range Biases: Time Series 7840 Herstmonceux
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Range Biases: Time Series
7941 Matera7939 Matera
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Range Biases: Time Series 8834 Wettzell
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Range Biases: Statistics LAGEOS-1
STD of Series:
Values outside
±100 mm removed
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Range Biases: Statistics LAGEOS-2
STD of Series:
Values outside
±100 mm removed
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ERP: Time SeriesLC: Estimates Differences w.r.t. LC
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ERP: Statistics
Test Case LC LS LS_E0 LS_EC
XP
Median of Series [µas] -27 -30 +7 +12
STD of Series [µas] 358 365 255 255
Median of STD [µas] 59.7 61.2 61.3 60.4
YP
Median of Series [µas] -50 -49 -14 -21
STD of Series [µas] 245 254 237 239
Median of STD [µas] 63.0 64.5 64.1 63.5
LOD
Median of Series [µs/d] +0.36 +0.48 +0.67 +0.58
STD of Series [µs/d] 46.0 47.1 42.1 42.1
Median of STD [µs/d] 8.2 8.2 8.3 8.1
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Differential Scale w.r.t ITRF2014
LC: Estimates
Differences w.r.t. LC
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Differential Scale w.r.t ITRF2014
Test Case LC LS LS_E0 LS_EC
DS
Median of Series [mm] -3.64 -3.76 +0.89 -2.62
STD of Series [mm] 4.80 4.87 5.95 5.62
Median of STD [mm] 3.38 3.44 3.57 3.44
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• Various RB test cases processed
• Covering 18 years (2000-2017)
• A priori EOP: C04_14
• Range Biases (core stations):- few very well calibrated stations- most stations with peculiar patterns
• ERP:- artefacts in XP,YP (LC)- improvement by adding Etalon (lower median/STD of time series)- negligible change in median of STD- negligible influence of RB
• Scale:- adding Etalon:
reducing artefacts in late 2001new artefacts in 2000-2001
- LS_E0 (LAGEOS+Etalon/no Etalon-RB): lowest median of time series!- LC (LAGEOS-only/ combined RB): lowest median of STD!
Conclusions
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Contact:Bundesamt für Kartographie und Geodäsie (BKG)
Richard-Strauss-Allee 11
60598 Frankfurt, Germany
Daniel Koenig
www.bkg.bund.de
