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 …

空间电离层是影响全球卫星导航系统(GNSS) 应用服务性能最棘手的误差源之一. **几十年来,
随着地基/空基GNSS 数据的日益丰富, 国内外学者发展并提出了多种重要技术措施修** …

GNSS ionospheric tomography technique is capable to reconstruct the high-quality 3D
ionospheric electron density (IED) images with a relatively low cost. We present a new …

Abstract Undifferenced and Uncombined Precise Point Positioning (UPPP) currently stands
as a prominent research area, where the integration of high-precision ionospheric products …

Maps of the total electron content (TEC) of the ionosphere can be reconstructed using data
extracted from global positioning system (GPS) signals. For historic and other sparse data …

In this study, a three‐dimensional (3‐D) ionospheric tomography was developed in Japan
using the constraint least‐square fitting algorithm, a model‐free method. Moreover, to make …

An improved ionospheric tomography algorithm is developed for the tomographic
reconstruction of the ionospheric electron density distribution based on the automatic search …

Computerized ionospheric tomography is an important technique for ionosphere
investigation. However, it is an ill-posed problem owing to an insufficient amount of available …

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

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 …