Wet tropospheric effects on precise relative GPS height determination
Wet tropospheric effects on precise relative GPS height determination
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DOI：
10.1007/bf00873700
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发表时间：
1996-01-01
影响因子：
4.4
通讯作者：
Jarlemark, POJ
中科院分区：
文献类型：
--
作者：
Dodson, AH;Shardlow, PJ;Jarlemark, POJ
最近，人们对使用全球定位系统（GPS）精确测定高度产生了相当大的兴趣。这些测量中的一个主要误差源是由于大气中的水蒸气造成的传播延迟。为了达到绝对海平面监测等应用所需的高精度，有必要改进湿延迟建模。GPS运动的结果表明，在Onsala站点使用水蒸气辐射计（WVR）测量的湿延迟变异性与从Onsala到延雪平134公里基线高度确定的残差绝对值之间存在显著的相关性（0.91）。这种相关性表明，从WVR数据推断出的大气变率包含了GPS高度估计质量的信息。在高大气活动期间，例如，在天气锋面通过期间，使用六参数梯度模式将垂直坐标在134 lan基线（小于1 × 10(-7)）上的传播从40毫米减少到20毫米（标准差分别为17毫米和9毫米），使用6个月期间11个不同天的8小时数据跨度。
Considerable interest has been generated recently in the use of the Global Positioning System (GPS) for precise height determination. A major error source in these measurements is the propagation delay due to atmospheric water vapour. In order to achieve the high precisions required for such applications as absolute sea-level monitoring improvement of wet delay modelling is necessary. Results from a GPS campaign show a significant correlation (0.91) between the variability of the wet delay measured using a water vapour radiometer (WVR) at the Onsala site and the absolute value of the residual error in the height determination of a 134 km baseline from Onsala to Jonkoping. This correlation indicates that the atmospheric variability as inferred from the WVR data includes information on the quality of the GPS height estimate. During periods of high atmospheric activity, e.g., during the passage of a weather front, the use of a six-parameter gradient model reduces the spread for the vertical coordinate from 40 mm to 20 mm (with standard deviations of 17 mm and 9 mm respectively) over the 134 lan baseline (less than 1 x 10(-7)) using 8 hour data spans on 11 different days over a six month period.