Status of Lunar Reconnaissance Orbiter Laser Ranging and Laser Altimeter Experiments

Details Status of Lunar Reconnaissance Orbiter Laser Ranging and Laser Altimeter Experiments Status of Lunar Reconnaissance Orbiter Laser Ranging and Laser Altimeter Experiments

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p31b1419n&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P31B-1419

Physics

1221 Lunar And Planetary Geodesy And Gravity (5417, 5450, 5714, 5744, 6019, 6250)

Scientific paper

Lunar Reconnaissance Orbiter (LRO) will be tracked in one-way and two-way modes by microwave and optical systems in order to meet its global measurement requirements of 1-m vertical and 50-m horizontal position accuracy. Up to 28 Earth-station laser fires may be received at the antenna-mounted telescope. Earth returns and lunar returns from 5 beams will be time-tagged simultaneously with sub-ns precision by the Lunar Orbiter Laser Altimeter (LOLA) instrument. On-board timing is maintained by an ovenized crystal oscillator whose stability is better than 2E-12 over 1 hour. Absolute timing will be determined from radio tracking and orbital dynamics. A 12-cube retroreflector array mounted on the -Z panel is a facility for future laser tracking by an Earth station such as APOLLO, which is expected to provide absolute range and time calibration. In addition to the prime NASA NGSLR-Greenbelt facility and the MacDonald Laser Ranging System in Texas, the NASA MOBLAS-6 (South Africa) and MOBLAS-5 (Australia) stations may also participate. Proposals are anticipated from six international stations capable of tracking at 532.2 nm. Multiple stations separated by long baselines firing simultaneously will enhance this type of tracking. Together with LOLA altimetric crossover analysis such tracking will lead to even more precise orbit determination of LRO. Sensitivity to tracking coverage and geometry will be presented.

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