GPS-based ionospheric tomography with a constrained adaptive simultaneous algebraic reconstruction technique

Journal of Earth system science

Tong Yangjin1¹  Wen Debao1¹  Leng Rusong1¹  Zhang Min1¹  Zhang Xiao1¹  Zhang Guangsheng2² 

[1] School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410004, China.$$;School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China.$$

关键词: Ionospheric tomography;    Gauss weighted function;    electron density;    constrained adaptive simultaneous algebraic reconstruction technique;    GPS.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

In this paper, a constrained adaptive simultaneous algebraic reconstruction technique (CASART) is presented to obtain high-quality reconstructions from insufficient projections. According to the continuous smoothness of the variations of ionospheric electron density (IED) among neighbouring voxels, Gauss weighted function is introduced to constrain the tomography system in the new method. It can resolve the dependence on the initial values for those voxels without any GPS rays traversing them. Numerical simulation scheme is devised to validate the feasibility of the new algorithm. Some comparisons are made to demonstrate the superiority of the new method. Finally, the actual GPS observations are applied to further validate the feasibility and superiority of the new algorithm.

【 授权许可】

Unknown