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Precise positioning of Chang’e 3 lander based on Helmert-VCE-aided weighting method using phase delay data from Chinese VLBI Network

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Figure 1: Geographical distribution for Chinese stations of CDSN and CVN. The red spot means Chinese radio track- track-ing stations and the yellow spot means VLBI stations
Figure 2: Geocentric VLBI delay model (a) and observing mode (b). (a): The initial lander position is given in the Mean Earth reference system of the moon (ME) and converted to the Barycentric Celestial Reference System (BCRS) (Archinal et al., 2011), mark
Figure 3: Flowchart of LUGREAS software with Helmert-VCE procedure in lander positioning
Figure 4: Weight values during the last iteration using the proposed optimal weighting method for all cases of December 20, 21, 22, 23 of 2013, as well as the combined four days.
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