建立了双频载波相位观测模型，并将其进行无电离层延迟化简，用最小二乘原理推导了天顶湿延迟的估值公式。
The dual-frequency carrier phase observation equation is built and ionosphere-free predigested, the estimate formula of zenith wet delay is deduced with least square method.
本文讨论了几种常用的对流层延迟和电离层延迟模型，分析了它们对各种时间比对方法的影响。
Several usual models for troposphere delay and ionosphere delay are discussed and their influences to different time transfer methods are analyzed.
本文介绍了卫星信号电离层延迟的网格校正法原理和算法。
The principle and algorithm of ionospheric delay correction using a grid mapping scheme is introduced.
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