This literature review paper focuses on existing vulnerabilities associated with global
navigation satellite systems (GNSSs). With respect to the civilian/non encrypted GNSSs, they …

对流层和电离层是地球**地空间环境中两个重要的组成部分, 是靠**地球表面且与人类生活联系
最密切的大气圈层. 全球导航卫星系统技术的快速发展, 为GNSS 空间环境学的研究提供了良好 …

The computerized ionospheric tomography usually involves solving an ill-posed inversion
problem. The sparsity of Global Positioning System (GPS) stations and the limitation of …

Ionized by solar radiation, the ionosphere causes a phase rotation or time delay to trans-
ionospheric radio waves. Reconstruction of ionospheric electron density profiles with global …

A simple and relatively fast method (C-SART) is presented for tomographic reconstruction of
the electron density distribution in the ionosphere using smooth fields. Since it does not use …

Computerized ionospheric tomography (CIT) can image 3-D ionospheric variations from
ground Global Navigation Satellite System (GNSS) observations. However, due to the …

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

We propose a contour integral-based algorithm for computing a few singular values of a
matrix or a few generalized singular values of a matrix pencil. Mathematically, the …

Singular value decomposition (SVD)-based 2D image reconstruction methods are
developed and evaluated for a broad class of inverse problems for which there are no …

The paper describes how to modify the two-sided Hari–Zimmermann algorithm for
computation of the generalized eigenvalues of a matrix pair (A, B), where B is positive …