Global Positioning System Reference
In-Depth Information
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[19
Figure 6.1
ZWD from GPS.
(Data from Bar-Sever, JPL.)
Lin
—
0.1
——
Nor
PgE
smallest are daily repeatability using zenith corrections, and the smallest ellipses are
daily repeatability using pointed corrections.
The ionosphere covers the region between approximately 50 and 1500 km above
the earth and is characterized by the presence of free (negatively charged) electrons
and positively charged atoms and molecules called ions. The total electron content
[19
Figure 6.2 Impact of modeled and observed water vapor variability on baseline.
(Per-
mission of the American Geophysical Union.)
