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Rotational Errors in IGS Orbit & ERP Products

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Simulated IERS <strong>ERP</strong> Tide Model <strong>Errors</strong><br />

<strong>in</strong>duced 3D errors<br />

← alias <strong>in</strong>to <strong>ERP</strong> parameters<br />

UT1 errors<br />

<strong>in</strong>troduced<br />

alias <strong>in</strong>to orbit parameters<br />

• Introduce admittance errors to IERS model at 10 to 20% level<br />

– simulated errors similar <strong>in</strong> magnitude to true model errors<br />

– 71 terms at 12h + 24h periods <strong>in</strong> each 1D component<br />

– <strong>in</strong> 3D, tidal errors beat to higher & lower frequencies<br />

04

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