Implementation and testing of the gridded Vienna Mapping Function 1 (VMF1)
Implementation and testing of the gridded Vienna Mapping Function 1 (VMF1)
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DOI：
10.1007/s00190-007-0170-0
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发表时间：
2008-04-01
影响因子：
4.4
通讯作者：
Kouba, J.
中科院分区：
文献类型：
--
作者：
Kouba, J.
实施了新的网格化维也纳制图功能（VMF 1），并将其与已确立的取决于站点的VMF 1进行了直接比较，并通过使用国际全球导航卫星系统服务（IGS）最后轨道/时钟的精确单点定位（PPP）对全球分布的11个IGS站点的1.5年全球定位系统数据集进行了比较。网格化的VMF 1数据可以在1994年之后的任何地点和任何时间内插，而与地点有关的VMF 1数据只在选定的IGS台站和2004年之后才有。网格化和站点相关VMF 1 PPP解决方案同意在1和2毫米内的水平和垂直位置分量，分别提供相应的VMF 1静压天顶路径延迟（ZPD）用于静压ZPD映射到倾斜延迟。总ZPD的网格化和网站依赖VMF 1数据同意PPP ZPD解决方案与RMS的1.5和1.8厘米，分别。这种精确的总ZPD可以提供有用的初始先验ZPD估计的运动学PPP和区域静态GPS解决方案。网格化VMF 1的流体静力ZPD与RMS为0.3 cm的站点依赖性VMF 1 ZPD相比，受到一些偏差和高达4 cm的不连续性的影响，这可能是由于在生成站点依赖性VMF 1数据时使用了不同的策略。在所有精密GPS和甚长基线干涉测量（VLBI）解决方案中，网格化的静力ZPD的精度应足以进行精确的先验静力ZPD制图。相反，精确和全球分布的总ZPD的大地测量解决方案，需要与VLBI联系起来控制偏差和稳定性，也应该为长期和最先进的数值天气建模提供一致和稳定的参考框架。
The new gridded Vienna Mapping Function (VMF1) was implemented and compared to the well-established site-dependent VMF1, directly and by using precise point positioning (PPP) with International GNSS Service (IGS) Final orbits/clocks for a 1.5-year GPS data set of 11 globally distributed IGS stations. The gridded VMF1 data can be interpolated for any location and for any time after 1994, whereas the site-dependent VMF1 data are only available at selected IGS stations and only after 2004. Both gridded and site-dependent VMF1 PPP solutions agree within 1 and 2 mm for the horizontal and vertical position components, respectively, provided that respective VMF1 hydrostatic zenith path delays (ZPD) are used for hydrostatic ZPD mapping to slant delays. The total ZPD of the gridded and site-dependent VMF1 data agree with PPP ZPD solutions with RMS of 1.5 and 1.8 cm, respectively. Such precise total ZPDs could provide useful initial a priori ZPD estimates for kinematic PPP and regional static GPS solutions. The hydrostatic ZPDs of the gridded VMF1 compare with the site-dependent VMF1 ZPDs with RMS of 0.3 cm, subject to some biases and discontinuities of up to 4 cm, which are likely due to different strategies used in the generation of the site-dependent VMF1 data. The precision of gridded hydrostatic ZPD should be sufficient for accurate a priori hydrostatic ZPD mapping in all precise GPS and very long baseline interferometry (VLBI) solutions. Conversely, precise and globally distributed geodetic solutions of total ZPDs, which need to be linked to VLBI to control biases and stability, should also provide a consistent and stable reference frame for long-term and state-of-the-art numerical weather modeling.