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Mitigation of Tropospheric Bias
Unlike the ionospheric delay, the tropospheric delay is not frequency
dependent. It cannot therefore be eliminated through linear
combinations of L1 and L2 observations. The tropospheric
delay is a function of elevation and altitude of the receiver, and is
dependent on many factors such as the atmospheric pressure, temperature,
and water vapor content. Several “standard” troposphere
models can be used to estimate the tropospheric delay. In this
software, the Saastamoinen troposphere model
Saasamoinen
1971 was introduced to calculate the total tropospheric zenith
delay while the Niell mapping function
Niell 1996 was used to
map the tropospheric zenith delay to the line of sight delay.
Detection and Fixing of Undifferenced Observation
Cycle Slip
Since cycle slips can occur concurrently and differently on L1 and
L2, the slip on each signal must be independently detectable. The

不像电离层的耽搁,对流层的耽搁对流层的倾向的减轻不是频率受抚养者.它不能因此被通过L1和L2观察的线性组合消灭.对流层的耽搁是一个海拔和收件人那一级的功能和是依靠例如大气压力,温度和水蒸汽内容很多因素.几个“standard”对流层模范能被用来估计对流层的耽搁.在这软件中,与此同时Niell 1996是的Niell绘图功能过去经常把对流层的顶点耽搁映射到视线耽搁,Saasamoinen 1971被向介绍的 Saastamoinen对流层模范计算总对流层的顶点耽搁.从循环滑倒起 Undifferenced供观察用的循环滑倒的探查和固定能同时发生地发生和不同在L1和L2上,有关每一信号滑倒必须独立是可察觉的 .undifferenced循环滑倒探查涉及观察,就是宽阔-小巷结合和电离层的结合Witchayangkoon的线性组合2000.如同讨论那样Undifferenced循环滑倒探查和固定

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