With the modify model of ZTD we can apply a new method for ZTD calculation of none auxiliary stations which can decrease the fee of the network and calculated time of GPS ZTD.
该模型为无网外辅助站对流层延迟的解算提供了一种新的方法，可以减少网络维持的费用和GPS解算对流层天顶延迟的时间。
With the modify model of ZTD we can apply a new method for ZTD calculation of none auxiliary stations which can decrease the fee of the network and calculated time of GPS ZTD.
该模型为无网外辅助站对流层延迟的解算提供了一种新的方法，可以减少网络维持的费用和GPS解算对流层天顶延迟的时间。
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