Digital Signal Processing Reference
In-Depth Information
Fig. 7.6
Geometry of ionospheric tomography
small meshes, in which the electron density is a constant for a period. With TEC
measurement, electron density of each mesh can be derived by inversing algorithm.
However, some meshes may have no GNSS signals to cross, so there are still
limitation for ground based GNSS ionospheric tomography (Jin et al.
2007b
).
While the space-borne GNSS RO can provide 3-D ionospheric profile information,
together ground GNSS observations, 3-D ionospheric products can be obtained
better, which can monitor the 3-D ionospheric structure and its variations.
7.5.3
Monitoring Ionospheric Anomalies
Earth's ionosphere is from about 60-1,000 km, which plays an important role
in the globe electric circuit. Due to Earth's magnetic field and solar activities,
the ionosphere is very complex. In addition, the ionospheric anomalies may be
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