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Update for IERS Conventions (2010) and Implementation Plans

This update focuses on key changes in the IERS Conventions (2010) related to precession, nutation, UT1, polar motion, pole tide, ocean loading, and more. It includes plans to modify inputs/outputs for νSolve and DiFX, updating to version 11, and implementing a C++ version.

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Update for IERS Conventions (2010) and Implementation Plans

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  1. Calc - Updating for IERS Conventions (2010): • Precession/Nutation – change to use IAU2006 precession model. Makes a difference of ~0.5 µas/yr from 2000.0. • Add and/or modify UT1 and polar motion libration model (formerly called short period nutation effects). Typically a few µas effect on EOP’s, sub-psec effect on delays. • Pole Tide – new mean pole model. • Ocean loading – calculate new coefficients. • Ocean pole tide loading (new model). Effect is typically no larger than 1.8/0.5/0.5 mm in U/E/N. • Antenna thermal expansion model - ? [In Solve] • Pressure loading and S1/S2 atmosphere tides - ? [In Solve] • VMF - ? [In Solve]

  2. Plans/Wishlist for Calc: • Update to version 11: • For IERS Conventions (2010). • Finite distance model • Thermal deformation (?) • Pressure loading (?) • VMF (?) • ????? • Modify inputs/outputs for νSolve and DiFX. • Create C++ version.

  3. Other Issues: Work with VLBA and/or other DiFX users for efficient use Of Calc. If processing time becomes an issue, several things can be done. Usage can be structured or computations saved to avoid re-computing the same things many times. Unused time derivatives and partials computations can be removed.

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