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ILRS Analysis Working Group, Orbit Benchmark Study

ILRS Analysis Working Group, Orbit Benchmark Study. NERC Space Geodesy Facility Graham Appleby Presentation to AWG, 2002 Oct 3-4, HTSI, MD, USA. Orbit Comparisons. Took analysis groups’ SolA, B and C geocentric ephemerides X and Xdot

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ILRS Analysis Working Group, Orbit Benchmark Study

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  1. ILRS Analysis Working Group, Orbit Benchmark Study NERC Space Geodesy Facility Graham Appleby Presentation to AWG, 2002 Oct 3-4, HTSI, MD, USA

  2. Orbit Comparisons • Took analysis groups’ SolA, B and C geocentric ephemerides X and Xdot • Formed differences, mainly from nerc, between values of X at each 2-minute epoch • Resolved differences into along, across and radial directions. • Plotted as functions of time

  3. Orbit benchmark-comments (1) • the initial orbits (solA) run off amongst themselves by between zero, 1m and 4m along-track; • For ausg-jcet, the differences are essentially zero. For the second stage (solB): • some groups (csr, crl, nerc, iaa) appear to solve for all orbital params; • others (jcet, asi, ausg) probably only solve for corrections to the initial state vector and initial 4-day along-track accelerations; • GEODYN groups agree with each other very well; • clear discontinuities at regular (4-day) intervals in the iaa orbits.

  4. Orbit benchmark-comments (2) For solC orbits: • GEODYN groups probably not correcting their orbits as a result of the solutions for stations and EOPs; • Some good agreements (nerc - csr, crl, iaa; ausg – jcet; nsd – jcet); • Some cm-level diurnal periodicities present in some differences.

  5. Comparison of EOPs in SolC.snx For those institutes that submitted SolC.snx files: • Simple differencing of Xp, Yp and UTsat from a-priori C04 series given in sinex files • Plots of results show: • asi, jcet apply loose constraints • dgfi apply strong constraints

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