Nothnagel, A. G., Böhm, S., Dach, R., Glomsda, M., Hellmers, H., Kirkvik, A.-S., NILSSON, J. T., Girdiuk, A., & Thaller, D. (2022). First Results of Project on Six-hourly EOP Piecewise Linear Offset Parameterization. In International VLBI Service for Geodesy and Astrometry 2022 General Meeting Proceedings (pp. 217–222).
International VLBI Service for Geodesy and Astrometry 2022 General Meeting Proceedings
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Date (published):
2022
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Event name:
12th IVS General Meeting (GM 2022)
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Event date:
28-Mar-2022 - 1-Apr-2022
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Event place:
Helsinki, Finland
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Number of Pages:
6
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Keywords:
Earth Orientation Parameter estimation; continuous piecewise linear functions
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Abstract:
Continuous piecewise linear functions are a helpful way of parameterizing time series in least-squares adjustments employing a Gauss-Markov model. In this publication, we present the benefits for routine IVS Earth Orientation Parameter (EOP) estimation and show results of a project set up for demonstrating the feasibility of this approach. Before we start with that, we point out deficits of the current EOP estimation approach with 24-hour offsets and rates stemming from the mismatch of tabulated a priori EOP values at day boundaries and the two-calendar-day spanning of contemporary IVS observing sessions. In addition, the current EOP parameterization causes a mismatch of the IVS-derived EOPs labeled with “24 hours” with the daily EOPs derived from other space-geodetic techniques.