Lunar satellite orbit determination analysis and quality assessment from Lunar Prospector tracking data and SELENE simulations

Goossens, Sander; Matsumoto, Koji

doi:10.1016/j.asr.2006.12.008

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…Although LP100K is not the most recent LP gravity model, we choose this model for our comparison. This is because the LP models are mostly lumped‐coefficient models which means that only full expansion gives the best integrated results [ Goossens and Matsumoto , 2007], and LP100K has the same truncation degree as SGM100h.…”

Section: Gravity Results and Comparison With Other Modelsmentioning

confidence: 99%

An improved lunar gravity field model from SELENE and historical tracking data: Revealing the farside gravity features

et al. 2010

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[1] A new spherical harmonic solution of the lunar gravity field to degree and order 100, called SGM100h, has been developed using historical tracking data and 14.2 months of SELENE tracking data (from 20 October 2007 to 26 December 2008 plus 30 January 2009). The latter includes all usable 4-way Doppler data collected which allowed direct observations of the farside gravity field for the first time. The new model successfully reveals farside features in free-air gravity anomalies which are characterized by ring-shaped structures for large impact basins and negative spots for large craters. SGM100h produces a correlation with SELENE-derived topography as high as about 0.9, through degree 70. Comparison between SGM100h and LP100K (one of the pre-SELENE models) shows that the large gravity errors which existed in LP100K are drastically reduced and the asymmetric error distribution between the nearside and the farside almost disappears. The gravity anomaly errors predicted from the error covariance, through degree and order 100, are 26 mGal and 35 mGal for the nearside and the farside, respectively. Owing to the 4-way Doppler measurements the gravity coefficients below degree and order 70 are now determined by real observations with contribution factors larger than 80 percent. With the SELENE farside data coverage, it is possible to estimate the gravity field to degree and order 70 without applying any a priori constraint or regularization. SGM100h can be used for global geophysical interpretation through degree and order 70.

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Section: Gravity Results and Comparison With Other Modelsmentioning

confidence: 99%

An improved lunar gravity field model from SELENE and historical tracking data: Revealing the farside gravity features

et al. 2010

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“…While Doppler shifts of frequencies due to relative motions of Main, Rstar, and the UDSC were not simulated in these tests, observations of the lunar orbits revealed measurements consistent with the test results. These test data were adopted in the processing of SELENE gravity data (Goossens and Matsumoto 2007;Matsumoto et al 2008Matsumoto et al , 2010. Phase noise recorded during the compatibility tests were used in the later tests of RSAT.…”

Section: Discussionmentioning

confidence: 99%

“…At the same time, conventional Doppler and range measurements are carried out between Rstar and UDSC, which we refer to as two-way Doppler and range measurements. RSAT realized the first direct observation of the gravity field over the farside of the Moon, and enabled global gravity anomaly mapping of the Moon (Goossens and Matsumoto 2007;Matsumoto et al 2008Matsumoto et al , 2010.…”

Section: Outlines Of the Selene Mission And Rsat Experimentsmentioning

confidence: 99%

“…Further, not only two-and four-way Doppler and range tracking data but also historical datasets from previous spacecraft missions are included in the gravity reduction processes of SELENE (Goossens and Matsumoto 2007;Matsumoto et al 2008Matsumoto et al , 2010. The relative weight of each dataset is evaluated by the expected variance in the Doppler and range measurements.…”

Section: Outlines Of the Selene Mission And Rsat Experimentsmentioning

confidence: 99%

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Ground Compatibility Tests for Gravity Measurement of SELENE: Accuracies of Two- and Four-Way Doppler and Range Measurements

et al. 2010

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The Japanese lunar mission Selenological and Engineering Explorer (SELENE) was launched in September 2007 and continued its mission until June 2009, when the main orbiter impacted with the surface of the Moon. SELENE consisted of three satellites: Main, Rstar, and Vstar. Rstar's tasks were to forward up-link signals from the Usuada Deep Space Center (UDSC) to Main, and to down-link returning signals from Main to UDSC. We refer to this tracking sub-system as a four-way Doppler measurement. In contrast, conventional tracking systems between Rstar and UDSC as well as between Main and ground stations are referred to as two-way Doppler and range measurements. Using Main and Rstar, we suc-N. Namiki et al.cessfully observed the gravity field over the farside of the Moon. Because four-way Doppler measurements via a relay sub-satellite were a fundamental experiment in space for Japanese space agencies, compatibility of radiometric instruments onboard Main and Rstar to UDSC were carefully examined at the UDSC using components manufactured for flight models. These tests not only proved the feasibility of the four-way Doppler measurements but also provided biases and variations of the four-way Doppler and two-way Doppler and range measurements that were later taken into account during the processing of tracking data and the analysis of the lunar global gravity field.

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“…which can be determined from LLR observations by making use of a comparative analysis [109]. Another advantage of the analytic approach is that it perfectly matches with the mathematical techniques that are going to be implemented in the data analysis of the lunar space missions Selene [6,[110][111][112] and Chang'e-1 [8,113] whose simulation analysis orbit determination and lunar gravity recovery is presently carried out by making use of GEODYN computer code [33].…”

Section: Lunar Librationsmentioning

confidence: 99%

Prospects in the orbital and rotational dynamics of the Moon with the advent of sub-centimeter lunar laser ranging

Kopeikin

Pavlis

et al. 2008

Advances in Space Research

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Lunar Laser Ranging (LLR) measurements are crucial for advanced exploration of the laws of fundamental gravitational physics and geophysics as well as for future human and robotic missions to the Moon. The corner-cube reflectors (CCR) currently on the Moon require no power and still work perfectly since their installation during the project Apollo era. Current LLR technology allows us to measure distances to the Moon with a precision approaching 1 millimeter. As NASA pursues the vision of taking humans back to the Moon, new, more precise laser ranging applications will be demanded, including continuous tracking from more sites on Earth, placing new CCR arrays on the Moon, and possibly installing other devices such as transponders, etc. for multiple scientific and technical purposes. Since this effort involves humans in space, then in all situations the accuracy, fidelity, and robustness of the measurements, their adequate interpretation, and any products based

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Lunar satellite orbit determination analysis and quality assessment from Lunar Prospector tracking data and SELENE simulations

Cited by 12 publications

References 11 publications

An improved lunar gravity field model from SELENE and historical tracking data: Revealing the farside gravity features

An improved lunar gravity field model from SELENE and historical tracking data: Revealing the farside gravity features

Ground Compatibility Tests for Gravity Measurement of SELENE: Accuracies of Two- and Four-Way Doppler and Range Measurements

Prospects in the orbital and rotational dynamics of the Moon with the advent of sub-centimeter lunar laser ranging

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