Orbit determination of Chang’E-3 and positioning of the lander and the rover

Huang, Yong; Chang, Shenghai; Li, Peijia; Hu, Xiaogong; Wang, Guangli; Liu, Qinghui; Zheng, Weimin; Mo, Fan

doi:10.1007/s11434-014-0542-9

Cited by 42 publications

(34 citation statements)

References 14 publications

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“…Since these images are the only measured data accessible to us, we compromise with a comparison of the imaged Earth disk and the simulated Earth disk ( Table 1). The elevation of the lander is −2632.0 m, and the location is (44.1206, −19.5124) in MER.DE421 [38], i.e., (44.1412, −19.5382) in PA.DE430. The orientation angles differ slightly from the angles in Equation (7) [32].…”

Section: Geometry Simulationmentioning

confidence: 99%

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Constructing a High-Accuracy Geometric Model for Moon-Based Earth Observation

et al. 2019

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The Moon provides us with a long-term, stable, and unique place for Earth observation. Space agencies of various countries, including the United States, China, and Italy, have made the realization of Moon-based Earth observation an objective of their lunar missions. To date, although some conceptual studies have been presented, an accurate geometric model for Moon-based Earth observation has not yet been described. This paper introduces such a geometric model, whichconnects the attitude of a Moon-based sensor with a corresponding field of view on the Earth’s surface. The aberration and light time correction are involved. Due to the lack of high-qualityexperimental data, one qualitative comparison with Chang’E lander images and another quantitative comparison with software output are made. The comparison results show good similarity. The overallmodel accuracy is evaluated to be better than 400 at current stage and will be better than 1.500 if the seleno-graphic position is accurately determined. In direct geolocation process, the aberration and light time will cause a total 0.7 km deviation on the ground near the sublunar point. In SAR range history simulation, the light time eect will lead to a linear error, as large as tens of meters, throughoutthe integration time.

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Section: Geometry Simulationmentioning

confidence: 99%

“…MER.DE421 [38], i.e., (44.1412, −19.5382) in PA.DE430. The orientation angles differ slightly from the angles in Equation (7) [32].…”

mentioning

confidence: 99%

Constructing a High-Accuracy Geometric Model for Moon-Based Earth Observation

et al. 2019

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“…The theoretical basis of estimating parameters with the observables by weighted least-square fitting is widely discussed and adopted [47], and the state matrix of partial derivatives with elements of VLBI is analyzed in detail [11,48].…”

Section: Position Determination Position Determination Of the Radiommentioning

confidence: 99%

Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight

Han

Zhang

Sun

et al. 2019

Advances in Astronomy

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China Chang’E-3 performed soft landing at the plains of Sinus Iridum on lunar surface on December 14th 2013 successfully; it opened a new window for observing lunar surface with radiometric tracking which many lunar scientific researchers always pursue for. Since July 2014, OCEL (Observing Chang’E-3 Lander with VLBI) project has been conducted jointly by IVS (International VLBI Service of Geodesy and Astrometry) and BACC (Beijing Aerospace Control Center), a global IVS R&D network augmented with two China Deep Space Stations configured for OCEL. This paper presents the current status and preliminary result of the OCEL and mainly focuses on determination of the lander position, which is about 7 meter in height and 14 meter in plane of lunar surface with respect to LRO (Lunar Reconnaissance Orbiter). Based on accuracy analysis, further optimized OCEL sessions will make use of this target-of-opportunity, the Chang’E-3 lunar lander, as long as it is working. With higher accurate radiometric observables, more prospective contribution to earth and lunar science is expected by combining with LLR.

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“…甚长基线干涉测量(Very Long Baseline Interferometry, VLBI)技术采用高稳定度原子钟作为独立本振系统, 其基线长度原则上不受限制, 而角分辨率与基线长度成正比, 因而能够获得极高的角分辨率 [1] , 自20世纪70年代被用于航天器的精密定轨以来, 在深空探测领域发挥了重要的作用 [2][3][4] .…”

Section: 引言unclassified

Positioning of spacecraft with VLBI inverse phase reference

Nie

Zhang

Qiao

et al. 2017

Sci. Sin.-Phys. Mech. Astron.

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For positioning of spacecraft with VLBI phase-reference, an extragalactic radio source was usually served as phase reference. After fringe fitting on the radio source, the solutions including delays and rates mainly from the propagation media were adapted to calibrate the observed phase of the spacecraft. The common phase errors of the nearby source pair were significantly reduced in their differential phases, allowing accurate relative position measurement. However, this traditional phase-reference method requires strong and nearby extragalactic radio source, which is hard to fulfill due to the lack of strong calibrators on the sky. Since the radio flux density from the spacecraft is much stronger than that of the extragalactic radio source, it is possible to use the spacecraft as phase reference. In this paper, we investigated the feasibility and advantages of this so called inverse phase reference method, based on real VLBI observations. We compared the data analysis results using the two phase reference methods, it proved that the inverse phase reference is capable to measure accurate relative positions, and could achieve better results that the traditional methods, especially when the extragalactic radio source was weak. planetary probe, VLBI phase reference, VLBI inverse phase reference, simulation of weak source

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Orbit determination of Chang’E-3 and positioning of the lander and the rover

Cited by 42 publications

References 14 publications

Constructing a High-Accuracy Geometric Model for Moon-Based Earth Observation

Constructing a High-Accuracy Geometric Model for Moon-Based Earth Observation

Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight

Positioning of spacecraft with VLBI inverse phase reference

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