Ill-posedness of GNSS-based ionospheric tomography affects the stability and the accuracy
of the inversion results. Truncated singular value decomposition (TSVD) is a common …

Reconstructing ionospheric electron density (IED) is an ill-posed inverse problem, with
classical Tikhonov regularization tending to smooth IED structures. By contrast, total …

Extra constraints are always brought into an ionosphere tomographic model to strengthen its
robustness. However, existent models using the constraints either show a weak restriction …

A novel ionospheric tomography technique based on variable pixel size was developed for
the tomographic reconstruction of the ionospheric electron density (IED) distribution. In …

Computerized ionospheric tomography is a highly ill-posed inverse problem, and
regularization tends to stabilize the problem to provide a unique solution. When a …

Ionospheric tomography is a popular technique for ionosphere imaging. Though dozens of
models have been proposed in the past decades, their inflexibilities in constraints …

A double-adaptive adjustment algorithm (DAAA) is proposed to reconstruct three-
dimensional ionospheric electron density (IED) distribution. In the DAAA method, the …

Recent developments in ionosphere remote sensing, in particular techniques using the
global positioning system (GPS) provide an unprecedented capability for monitoring the …

Techniques such as tomographic reconstruction may be used to provide images of electron
content in the ionosphere. Models are also available which attempt to describe the dominant …