تقرير
Time and Laser Ranging: A Window of Opportunity for Geodesy, Navigation and Metrology
| العنوان: | Time and Laser Ranging: A Window of Opportunity for Geodesy, Navigation and Metrology |
|---|---|
| المؤلفون: | P. Exertier, A. Belli, E. Samain, W. Meng, H. Zhang, K. Tang, A. Schlicht, U. Schreiber, U. Hugentobler, I. Prochazka, X. Sun, J. F. Mcgarry, D. Mao, A. Neumann |
| المصدر: | Journal of Geodesy. 93 |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Lasers And Masers |
| الوصف: | Recent progress in the domain of time and frequency (T/F) standards requires important improvements of existing time distribution links. Among these, the accuracy of time transfer is actually an important part of the concerns in order to establish and maintain time & space references from ground and/or space facilities. Several time transfers by laser link projects have been carried out over the past 10 years with numerous scientific and metrological objectives. Satellite Laser ranging (SLR) has proven to be a fundamental tool, offering a straightforward, conceptually simple, highly accurate and unambiguous observable. Depending on the mission, LR is used to transmit time over two-way or one-way distances from 500 to several millions of km. The following missions and their objectives employed this technique: European Laser Timing (ELT) at 450 km, Time Transfer by Laser Link (T2L2) at 1,336 km, Laser Time Transfer (LTT) at 36,000 km, Lunar Reconnaissance Orbiter (LRO) at 350,000 km, and MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) at tens of million km. This article describes the synergy between SLR and T/F technologies developed on the ground and in space and as well as the state of the art of their exploitation. The performance and sources of limitation of such space missions are analyzed. It shows that current and future challenges lie in the improvement of the time accuracy and stability of the time for ground geodetic observatories. The role of the next generation of SLR systems is emphasized both in space and at ground level, from the point of view of GGOS and valuable exploitation of the synergy between time synchronization, ranging and data transfer. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1432-1394 0949-7714 |
| DOI: | 10.1007/s00190-018-1173-8 |
| URL الوصول: | https://ntrs.nasa.gov/citations/20180004492 |
| ملاحظات: | code 698 |
| رقم الأكسشن: | edsnas.20180004492 |
| قاعدة البيانات: | NASA Technical Reports |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 14321394 09497714 |
|---|---|
| DOI: | 10.1007/s00190-018-1173-8 |