The importance of co-located VLBI Intensive stations and GNSS receivers
نویسندگان
چکیده
Abstract Frequent, low-latency measurements of the Earth’s rotation phase, expressed as UT1 $$-$$ - UTC critically support current estimate and short-term prediction this highly variable Earth orientation parameter (EOP). Very long baseline interferometry (VLBI) Intensive sessions provide required data. However, measurement accuracy depends on numerous models, including VLBI station position. Intensives observed with Maunakea (Mk) Pie Town (Pt) stations Long Baseline Array (VLBA) illustrate how a geologic event (i.e., $$M_w$$ M w 6.9 Hawai‘i Earthquake May 4th, 2018) can cause displacement an associated offset in values measured by that baseline, rendering data from series useless until it is corrected. Using nonparametric Nadaraya–Watson estimator to smooth before after earthquake, we calculate be 75.7 ± 4.6 $$\upmu $$ μ s. Analysis sensitivity Mk-Pt baseline’s position changes shows consistent 67.2 5.9 s expected based 12.4 0.6 mm total coseismic VLBA determined co-located global navigation satellite system (GNSS) station. GNSS information known latency order tens hours thus used correct priori model such continue accurate critical EOP part sessions. In absence receiver, would likely not updated for several months, near real-time correction possible. This contrast highlights benefit monitoring single-baseline Intensives.
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ژورنال
عنوان ژورنال: Journal of geodesy
سال: 2023
ISSN: ['1432-1394', '0949-7714']
DOI: https://doi.org/10.1007/s00190-022-01690-1