Abstract To solve the problems of unreasonable distribution of global grid points, biased statistical results and low calculation and storage efficiency of the equal-arch-length grid (GRID_ELL), which is often used in position dilution of precision (PDOP) monitoring and evaluation, we introduce the equal-arch-length grid (GRID_EAL) and the icosahedron-based grid (GRID_IB) to further develop the global PDOP long-period real-time monitoring service. We analyze the differences between them and the GRID_ELL model. The results show that the two equal-area grid models can significantly improve the uneven distribution of global grid points in the GRID_ELL model and the bias in the current global PDOP monitoring assessment statistics. Focusing on the applicability of the GRID_EAL model with different grid spacing, the results show that the GRID_EAL model with 5° spacing can bring 36.3% and 34.1% improvement and optimization in its computational efficiency and storage while maintaining the accuracy of the global PDOP monitoring assessment.
WANG Zhitao,SONG Shuli,JIAO Guoqiang et al. An Efficient Method for GNSS PDOP Assessment by Using Equal-Area Grid Models[J]. jgg, 2022, 42(6): 606-611.
WANG Zhitao,SONG Shuli,JIAO Guoqiang et al. An Efficient Method for GNSS PDOP Assessment by Using Equal-Area Grid Models[J]. jgg, 2022, 42(6): 606-611.