KEYWORDS: Digital imaging, Raster graphics, Printing, Holography, 3D image processing, Image segmentation, Image processing, Holograms, Image resolution, Depth of field
Naked-eye 3D map is based on the theories of DEM (Digital Elevation Model) and lentricular grating imaging,which users can get three-dimensional experience without the aid of software and hardware systems. The hierarchical method on depth of field and plane displacement are the key techniques and used to reduce the production cost. This article briefly introduces the three-dimensional display principle of Naked-eye 3D maps, elaborates on the production process of Naked-eye 3D maps, and finally summarizes the printing and post-printing processing methods of Naked-eye 3D maps.
BDS-3 (Beidou System 3) reached global coverage in June 2020. In comparison with BDS-2 (Beidou system 2), BDS-3 has greatly improved in terms of satellite orbits, atomic clocks, and signal transmissions. BDS-3 is now being used widely in practice. This paper is focused on performance analysis of BDS-3 vs. BDS-2 and GPS. Six baselines of different lengths were selected to result in single-system multi-frequency relative positioning solutions from BDS-2, BDS-3, and GPS, respectively. The long baselines were resolved with using the random walk constraints on the residual atmospheric delay. The positioning performance of each system was analyzed against the atmospheric delay error and the convergence property of the floated ambiguity resolution. The experiments showed that the convergence speed of BDS-3 was twice as fast as BDS-2, and the average convergence speed was also faster than GPS, which was increased by about 2.7%. In comparison with BDS-2, the accuracy of BDS-3 was improved by about 40%, but the accuracy was 7% lower than GPS solution and the positioning stability of BDS-3 was also not as good as GPS.
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