Quality assessment of GPS rapid static positioning with weighted ionospheric parameters in generalized least squares
Quality assessment of GPS rapid static positioning with weighted ionospheric parameters in generalized least squares
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DOI：
10.1007/s10291-010-0168-6
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发表时间：
2011-04
期刊：
影响因子：
4.9
通讯作者：
P. Wielgosz
中科院分区：
文献类型：
--
作者：
P. Wielgosz
精确的GPS定位需要处理载波相位观测值和确定整周模糊度。随着接收器之间距离的增加，模糊度固定变得更加困难，因为在双差分中电离层和对流层的影响不能充分抵消。静态定位中的一个常用程序是增加观测时间和/或应用大气层（电离层）模型和校正。我们调查的方法，GPS快速静态定位，只需要几分钟的双频GPS观测中长基线。不需要电离层校正，但电离层延迟被视为具有先验值和相应权重的伪观测。对流层延迟通过使用建立良好的对流层模型来减小，卫星轨道和时钟误差通过使用IGS快速产品来消除。给出了几个基于实际GPS数据的数值试验。结果表明，所提出的方法是适合于快速静态定位在50-70公里内，从最近的参考网络站和厘米级的定位精度是可行的，当只使用1分钟的双频GPS数据。
Precise GPS positioning requires the processing of carrier-phase observations and fixing integer ambiguities. With increasing distance between receivers, ambiguity fixing becomes more difficult because ionospheric and tropospheric effects do not cancel sufficiently in double differencing. A popular procedure in static positioning is to increase the length of the observing session and/or to apply atmospheric (ionospheric) models and corrections. We investigate the methodology for GPS rapid static positioning that requires just a few minutes of dual-frequency GPS observations for medium-length baselines. Ionospheric corrections are not required, but the ionospheric delays are treated as pseudo-observations having a priori values and respective weights. The tropospheric delays are reduced by using well-established troposphere models, and satellite orbital and clock errors are eliminated by using IGS rapid products. Several numerical tests based on actual GPS data are presented. It is shown that the proposed methodology is suitable for rapid static positioning within 50–70 km from the closest reference network station and that centimeter-level precision in positioning is feasible when using just 1 min of dual-frequency GPS data.