GIVE主要是关于电离层误差，反映的是用广域差分格网点电离层计算出的与用双频计算出的穿透点电离层误差之间的差异。
UDRE is related to the status of satellites, including clock errors of satellites and ephemeris errors. And GIVE is mainly about ionospheric errors.
GIVE主要是关于电离层误差，反映的是用广域差分格网点电离层计算出的与用双频计算出的穿透点电离层误差之间的差异。
UDRE is related to the status of satellites, including clock errors of satellites and ephemeris errors. And GIVE is mainly about ionospheric errors.
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