The Chang’e 3 Mission Overview

Li, Chunlai; Liu, Jianjun; Ren, Xin; Zuo, Wei; Xu, Tianheng; Wen, Wu; Li, Han; Mu, Lingli; Su, Yan; Zhang, Hongbo; Yan, Jun; Ouyang, Ziyuan

doi:10.1007/s11214-014-0134-7

Cited by 82 publications

(36 citation statements)

References 18 publications

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“…Such observations are used, for example, to provide wind measurements of the atmosphere of Titan (Lebreton et al 2005), to improve the Saturn ephemerides by the astrometry of Cassini with the Very Long Baseline Array (VLBA) (Jones et al 2015), and to measure the lateral position of the European Space Agency's Mars Express (MEX) spacecraft during its closest-ever flyby of the Martian moon Phobos (Duev et al 2016). As of this writing, the Chang'e 3 lander is on the Moon (Liu et al 2014;Li et al 2015;Zheng et al 2015), and another lander, Chang'e 5, will be placed on the Moon in the near future. Phase-referencing observations of the radio beacon onboard these landers will be used to study the Moon's libration and its response to solid tides induced by the Earth and Sun.…”

Section: Introductionmentioning

confidence: 99%

VLBI Ecliptic Plane Survey: VEPS-1

Shu

Petrov²,

Jiang

et al. 2017

ApJS

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We present here the results of the first part of the VLBI Ecliptic Plane Survey (VEPS) program. The goal of the program is to find all compact sources within  7 . 5 of the ecliptic plane that are suitable as calibrators for anticipated phase referencing observations of spacecraft, and determine their positions with accuracy at the 1.5nrad level. We run the program in two modes: search and refine. In the search mode, a complete sample of all sources brighter than 50 mJy at 5 GHz listed in the Parkes-MIT-NRAO and Green Bank 6cm (GB6) catalogs, except those previously detected with VLBI, is observed. In the refining mode, the positions of all ecliptic plane sources, including those found in the search mode, are improved. By 2016 October, thirteen 24 hr sessions that targeted all sources brighter than 100mJy have been observed and analyzed. Among 3320 observed target sources, 555 objects have been detected. We also conducted a number of follow-up VLBI experiments in the refining mode and improved the positions of 249 ecliptic plane sources.

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Section: Introductionmentioning

confidence: 99%

VLBI Ecliptic Plane Survey: VEPS-1

Shu

Petrov²,

Jiang

et al. 2017

ApJS

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“…The goal of these experiments was to obtain a better understanding of the physical properties of the Moon. Examples of recent lunar programs include LADEE (Lunar Atmosphere and Dust Environment Explorer; Elphic et al 2014), CLEP (Chinese Lunar Exploration Program; Li et al 2015) and GRAIL (Gravity Recovery and Interior Laboratory; Konopliv et al 2013). The VLBI technique was also used for the spacecraft orbit determination during the SELENE (SELenological and ENgineering Explorer) mission (Kato et al 2008) by using phase delays from same-beam differential VLBI (Kikuchi et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Geodetic VLBI with an artificial radio source on the Moon: a simulation study

Kłopotek

Hobiger

Haas

2017

J Geod

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We perform extensive simulations in order to assess the accuracy with which the position of a radio transmitter on the surface of the Moon can be determined by geodetic VLBI. We study how the quality and quantity of geodetic VLBI observations influence these position estimates and investigate how observations of such near-field objects affect classical geodetic parameters like VLBI station coordinates and Earth rotation parameters. Our studies are based on today's global geodetic VLBI schedules as well as on those designed for the next-generation geodetic VLBI system. We use Monte Carlo simulations including realistic stochastic models of troposphere, station clocks, and observational noise. Our results indicate that it is possible to position a radio transmitter on the Moon using today's geodetic VLBI with a two-dimensional horizontal accuracy of better than one meter. Moreover, we show that the nextgeneration geodetic VLBI has the potential to improve the two-dimensional accuracy to better than 5 cm. Thus, our results lay the base for novel observing concepts to improve both lunar research and geodetic VLBI.

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“…Due to difference in formation, the soil composition of the Moon differs significantly from that of Earth (Mitchel et al, 1972). Lunar soil's physical properties are primarily influenced by mechanical disintegration of basaltic and anorthositic rocks, caused by continuous meteorite impact and bombardment by interstellar charged atomic particles over billions of years (Chunlai Li et al, 2015). Understanding the Lunar soil properties has been of interest to both lunar geologists and engineers and can help with landing site selection, design and sizing of the rover, drill and sampler, etc.…”

Section: Introductionmentioning

confidence: 99%

“…These terrain images had been used for interpreting rover path in conjunction with data of the orbital imagery and rover wheel odometry. Figure 1b (Chunlai Li et al, 2015) illustrates that the Yutu traveled from and around the lander covering approximately 40m by 50m area before it encountered mechanical fault. The rest of this paper presents an alternative application of the PanCam images for indirect measurement of the rover wheel sinkage leading to the derivation of planetary soil properties.…”

Section: Introductionmentioning

confidence: 99%