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Abstract:
This paper provides a comprehensive overview of the development of Lunar Laser Ranging (LLR), covering key components such as ground observatories, lunar retro-reflectors, and data formats. The paper details the evolution of LLR experiments conducted by some major world-class observatories, with a particular focus on addressing critical issues associated with LLR technology. Additionally, the article highlights the latest advancements in the field, elucidating scientific achievements derived from LLR data, including its contributions to gravitational theory, Earth Orientation Parameters, lunar physics exploration, and lunar librations. The review summarizes new challenges in LLR modeling and concludes with prospects for the future development of LLR.
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Keywords:
- Lunar Laser Ranging /
- Retro-reflectors /
- Observatories /
- Gravity
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ACKNOWLEDGMENTS: We thank Dr. Mikhail V. Vasilyev and Dr. Eleonora I. Yagudina from the Russian Institute of Applied Astronomy (IAA RAS) for providing information on the history of Lunar Laser Ranging at the Crimea Observatory and related developments of the EPM lunar ephemerides. This research is supported by the National Key Research and Development Program of China (2021YFA0715101), the National Natural Science Foundation of China (12033009, 12103087), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA0350300), the International Partnership Program of Chinese Academy of Sciences (020GJHZ2022034FN), the Yunnan Fundamental Research Projects (202201AU070225, 202301AT070328, 202401AT070141), the Young Talent Project of Yunnan Revitalization Talent Support Program. The work of the European authors is supported by ESA (European Space Agency) under the ESA-INFN contract n. 4000133721/21/NL/CR and by ASI (Agenzia Spaziale Italiana) under the Research Agreement n. 2019-15-HH.0.
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Figure 1. Retro-reflector positions on the Moon[5].
Figure 6. Top panel: Data-Model agreement (line with points) as quantified by the RMS of the post-fit residuals of LLR data with the JPL solar system ephemeris model. Bottom panel: A stacked histogram that displays the annual count of normal point data generated by each LLR station[10].
Figure 10. Looking north along the escarpment at APO, the prominent dome silhouetted against the sky contains the LLR 3.5 m telescope. Behind and to the right of it stands the white, cone-shaped SUNSPOT solar telescope[11].
Figure 13. The ACS enclosure houses a laser, which emits a sequence of
1064 nm pulses, each lasting 10 ps, into an optical fiber. The laser repetition-rate controller, specifically the Microsemi 5071A, synchronizes the fiber laser with a cesium frequency standard. A universal counter, the Agilent 53132A, is used to compare the frequency of the cesium clock with that of a clock regulated by Global Positioning System (GPS) data, the TrueTime XL-DC. The dashed line in the diagram indicates temporary and intermittent adjustments made to observe the growing phase discrepancy between the two clocks[13].Figure 17. Repartition of normal points during the synodic month[16].
Table 1 Normal point data for major observatories
Observatory Observation time Normal point data McDonald 1969–2015 7 905 Grasse 1986–2021 18 201 Haleakala 1984–1990 770 Apache Point 2006–2021 3 877 Wettzell 2018–2021 115 Crimean Astrophysical 1973–1981 103 Matera 2003–2021 380 ALL 1969–2021 31 351 -
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