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VLBI2010 Error Budget CALC/SOLVE Simulations Dan MacMillan NVI/NASA/GSFC

VLBI2010 Error Budget CALC/SOLVE Simulations Dan MacMillan NVI/NASA/GSFC. Errors Modeled with SOLVE. Troposphere turbulence: Kolmogorov turbulence, latitude- dep model for refractive structure constant Cn (based on high resolution radiosonde data analysis of T . Nilsson)

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VLBI2010 Error Budget CALC/SOLVE Simulations Dan MacMillan NVI/NASA/GSFC

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  1. VLBI2010 Error Budget CALC/SOLVE Simulations Dan MacMillan NVI/NASA/GSFC

  2. Errors Modeled with SOLVE • Troposphere turbulence: Kolmogorov turbulence, latitude-dep model for refractive structure constant Cn (based on high resolution radiosonde data analysis of T. Nilsson) • Hydrostatic troposphere mapping function (VMF): Bias error [Boehm et al. 2006], RMS error [Niell 2006] • Antenna gravitational deformation: Based on Sarti/Abbondanza measurements of Noto and Medicina antenna deformation • Site pressure error: Sensitivity to pressure error ~ 2 mm/mbar • Clock error: ASD 1x10-14 at 50 minutes • Observation noise: Assumed 4 ps uncertainty

  3. Site Vertical Position Error Budget 1. 3D raytracing of gridded global weather model data should improve this 2. ParoScientific Met3A precision: 0.1C , 0.08 hPaand 0.01 hPa/yr

  4. VLBI2010 16-StationSimulation Network

  5. Hydrostatic Mapping Function

  6. Troposphere Turbulence

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