GEODESY BY RADIO INTERFEROMETRY - EFFECTS OF ATMOSPHERIC MODELING ERRORS ON ESTIMATES OF BASELINE LENGTH
GEODESY BY RADIO INTERFEROMETRY - EFFECTS OF ATMOSPHERIC MODELING ERRORS ON ESTIMATES OF BASELINE LENGTH
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DOI：
10.1029/rs020i006p01593
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发表时间：
1985-01-01
期刊：
影响因子：
1.6
通讯作者：
ELGERED, G
中科院分区：
文献类型：
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作者：
DAVIS, JL;HERRING, TA;ELGERED, G
对超长基线干涉测量数据的分析表明，先前估计基线长度的系统误差（约 8000 公里基线的 5 厘米量级）主要是由于对流层和中间层的电路径长度的错误建模（“大气延迟”）造成的。在这里，我们讨论了先前使用的大气延迟模型中存在此类误差的观测证据，并针对该延迟的仰角依赖性开发了一种新的“映射”函数。对于此处分析的多站洲际实验，在所有仰角低至 5° 仰角的情况下，这种新映射函数预测的延迟与射线追踪结果的差异小于 ∼ 5 mm，并且将误差引入到基线长度 ≲ 1 cm 的估计中。
Analysis of very long baseline interferometry data indicates that systematic errors in prior estimates of baseline length, of order 5 cm for ∼ 8000‐km baselines, were due primarily to mismodeling of the electrical path length of the troposphere and mesosphere (“atmospheric delay”). Here we discuss observational evidence for the existence of such errors in the previously used models for the atmospheric delay and develop a new “mapping” function for the elevation angle dependence of this delay. The delay predicted by this new mapping function differs from ray trace results by less than ∼ 5 mm, at all elevations down to 5° elevation, and introduces errors into the estimates of baseline length of ≲ 1 cm, for the multistation intercontinental experiment analyzed here.