中文摘要：

附加约束的电离层层析算法是解决电离层电子密度反演中不适定问题的主要方法,为避免此类方法中约束权阵的选取不当对电子密度分布重构产生的不良影响,本文将选权拟合法应用到电离层层析成像技术中.该方法特别设计了依据电子密度空间分布特性构造参数权矩阵的方案.新方法有明确的物理意义,挖掘了隐含的信息量,为解决电离层电子密度反演中由于观测数据的不足等因素引起的不适定问题提供了一种新途径,可以得到符合客观实际的结果.数值模拟实验和实测数据的反演结果证实了该算法有效性、可靠性和优越性.

英文摘要：

The main methods to resolve the ill-posed problem are the constraint algorithms in the process of the ionospheric electron density inversion. To avoid the defective influence of the unreasonable constraint weight matrix on the ionospheric electron density reconstruction, the Fitting Method by Selection of the Parameter Weights （FMSPW） is innovatively applied to resolve the ill-posed problem in the ionospheric tomographic system. In this method, a new scheme of constructing parameter weights matrix is specially devised by analyzing the correlation of the ionospheric electron density among those neighboring cells. Using this scheme equals to add the observation information needed by the inversion of ionospheric electron density, and the ill-posed problem of the ionospheric tomography system is efficiently resolved. The reliability and feasibility of the FMSPW and its superiority to the conventional CIT （Computerized Ionospheric Tomography） algorithms are demonstrated by numerical simulation tests. Finally, the FMSPW is used to perform the tomographic reconstruction of ionospheric electron density distribution in amid-latitude region.