Future TRFs and GGOS – where to put the next SLR station?
Item
Title (Dublin Core)
Future TRFs and GGOS – where to put the next SLR station?
Description (Dublin Core)
<p>Satellite Laser Ranging (SLR) is one of the four geodetic space techniques contributing to the realisation of terrestrial reference frames (TRFs) as well as to the determination of Earth Rotation Parameters (ERPs). The current SLR tracking network suffers from an insufficient network geometry due to a lack of stations especially in the southern hemisphere. Previous simulation studies have shown that the extension of the global SLR tracking network is indispensable for reaching the target accuracy of future TRFs according to user requests and the ambitious goals of the Global Geodetic Observing System (GGOS). The simulation study presented here puts the focus on a determination of the locations where additional SLR stations are most valuable for an improved estimation of the geodetic parameters.</p>
<p>Within the present study, we perform a simulation of a set of stations distributed homogeneously over the globe and compare different solutions, always adding one of these simulated stations to the real SLR station network. This approach has been chosen in order to be able to investigate the deficiencies of the existing SLR network and to judge in which regions on the globe an additional SLR station would be most valuable for the improvement of certain geodetic parameters of SLR-derived reference frames. It is shown that the optimum location of a future SLR station depends on the parameter of interest. In case of the ERPs, the main potential for improvement by a single additional station can be shown for locations in polar regions (improvement for <span class="inline-formula"><i>y</i><sub>pole</sub></span> up to 7 %) and for locations along the equator for the lengh of day (LOD, improvement up to 1.5 %). The TRF parameters would benefit from an additional station around the pierce points of the axes of the terrestrial reference frame (improvement for <span class="inline-formula"><i>t</i><sub><i>y</i></sub></span> up to 4 %), the Arctic and the Pacific Ocean region (<span class="inline-formula"><i>t</i><sub><i>z</i></sub></span> improved by up to 4.5 %), and the Antarctic and the Indian Ocean region (scale improved by up to 2.2 %). As outcome of this study, it is concluded that an additional SLR site in the Antarctic region might be of first priority, enabling improvements in the pole coordinates and the scale of the TRF; potential further sites are recommended in the equatorial region, especially beneficial for the origin of the realised TRF as well as for LOD.</p>
<p>Within the present study, we perform a simulation of a set of stations distributed homogeneously over the globe and compare different solutions, always adding one of these simulated stations to the real SLR station network. This approach has been chosen in order to be able to investigate the deficiencies of the existing SLR network and to judge in which regions on the globe an additional SLR station would be most valuable for the improvement of certain geodetic parameters of SLR-derived reference frames. It is shown that the optimum location of a future SLR station depends on the parameter of interest. In case of the ERPs, the main potential for improvement by a single additional station can be shown for locations in polar regions (improvement for <span class="inline-formula"><i>y</i><sub>pole</sub></span> up to 7 %) and for locations along the equator for the lengh of day (LOD, improvement up to 1.5 %). The TRF parameters would benefit from an additional station around the pierce points of the axes of the terrestrial reference frame (improvement for <span class="inline-formula"><i>t</i><sub><i>y</i></sub></span> up to 4 %), the Arctic and the Pacific Ocean region (<span class="inline-formula"><i>t</i><sub><i>z</i></sub></span> improved by up to 4.5 %), and the Antarctic and the Indian Ocean region (scale improved by up to 2.2 %). As outcome of this study, it is concluded that an additional SLR site in the Antarctic region might be of first priority, enabling improvements in the pole coordinates and the scale of the TRF; potential further sites are recommended in the equatorial region, especially beneficial for the origin of the realised TRF as well as for LOD.</p>
Creator (Dublin Core)
A. Kehm
M. Bloßfeld
P. König
F. Seitz
Subject (Dublin Core)
Science
Q
Geology
QE1-996.5
Dynamic and structural geology
QE500-639.5
Publisher (Dublin Core)
Copernicus Publications
Date (Dublin Core)
2019-11-01T00:00:00Z
Type (Dublin Core)
article
Identifier (Dublin Core)
10.5194/adgeo-50-17-2019
1680-7340
1680-7359
https://doaj.org/article/37b667d6c7324b01b51422b86f95cf20
Source (Dublin Core)
Advances in Geosciences, Vol 50, Pp 17-25 (2019)
Language (Dublin Core)
EN
Relation (Dublin Core)
https://www.adv-geosci.net/50/17/2019/adgeo-50-17-2019.pdf
https://doaj.org/toc/1680-7340
https://doaj.org/toc/1680-7359
Provenance (Dublin Core)
Journal Licence: CC BY