Preliminary evaluation of atmospheric mapping functions based on numerical weather models
Preliminary evaluation of atmospheric mapping functions based on numerical weather models
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DOI：
10.1016/s1464-1895(01)00087-4
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发表时间：
2001-01-01
期刊：
影响因子：
--
通讯作者：
Niell, AE
中科院分区：
文献类型：
--
作者：
Niell, AE
利用原位大气状态改进了无线电频率下天顶静水延迟到低至3度的映射。这些信息可以从数值天气模式中获得，从而在全球范围内提供更好的大气校准。通过比较1994年1月以来一组有限的高精度实验用甚长基线干涉法测量的基线长度的可重复性，对新模型进行了评价。与使用Niell（1996）映射函数相比，改进虽然显著，但低于预期，表明未建模误差的其他来源。2001爱思唯尔科学有限公司版权所有。
Mapping of the zenith hydrostatic delay at radio frequencies to elevations as low as 3 degrees has been improved by making use of the in situ atmosphere state. This information might be obtained from a numerical weather model, thus providing better atmosphere calibration on a global scale. The new model has been evaluated by comparing the repeatability of the lengths of baselines measured by Very Long Baseline Interferometry for a limited set of high accuracy experiments from 1994 January. The improvement compared to using the Niell (1996) mapping function, though significant, is less than expected, indicating other sources of unmodeled error. (C) 2001 Elsevier Science Ltd. All rights reserved.