Integer Ambiguity Resolution on Undifferenced GPS Phase Measurements and Its Application to PPP and Satellite Precise Orbit Determination
Integer Ambiguity Resolution on Undifferenced GPS Phase Measurements and Its Application to PPP and Satellite Precise Orbit Determination
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DOI：
10.1002/j.2161-4296.2009.tb01750.x
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发表时间：
2007-09
影响因子：
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通讯作者：
D. Laurichesse;F. Mercier;J. Berthias;P. Broca;L. Cerri
中科院分区：
文献类型：
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作者：
D. Laurichesse;F. Mercier;J. Berthias;P. Broca;L. Cerri
整周模糊度固定通常应用于双差GPS相位测量以实现精确定位。双差很有趣，因为它消除了不同信号路径之间的大部分常见误差。然而，如果常见误差能够被估计，那么在非差测量中固定整周模糊度就变得很有吸引力。此时相位测量就变成了类似伪距的测量，噪声水平为几毫米。本文介绍了一种在本地或全球范围内对非差相位测量进行双频GPS模糊度固定的新方法。在此过程中获得的GPS星座的时钟可用于地面接收机的精密单点定位以及低地球轨道卫星的精密轨道确定。所得到的定位精度与标准差分定位相当，且无需参考站。GRACE和Jason卫星的模糊度固定卫星轨道比当今现有的最精确解更精确。
Integer ambiguity fixing is routinely applied to double-differenced GPS phase measurements to achieve precise positioning. Double-differencing is interesting because it removes most of the common errors between the different signal paths. However, if common errors can be estimated it becomes attractive to fix integer ambiguities on undifferenced measurements. Phase measurements then become pseudorange-like measurements with a noise level of a few millimeters. This paper introduces a new method for fixing dual-frequency GPS ambiguities on undifferenced phase measurements either locally or globally. The clocks for the GPS constellation obtained during this process can be used for precise point positioning of ground based receivers and for precise orbit determination of low Earth orbiting satellites. The resulting positioning precision is comparable to that of standard differential positioning without the need for a reference station. Ambiguity-fixed satellite orbits for the GRACE and Jason satellites are more precise than the most precise solution available today.