顾及电离层变化的层析反演新算法

发布时间：2018-05-20 02:38

本文选题：GPS + 电离层层析　；参考：《地球物理学报》2016年07期

【摘要】：区别于以往GPS电离层层析研究主要关注迭代模型的思路,本文从两方面入手提高GPS电离层层析迭代算法的反演精度:一方面,顾及传统电离层层析迭代模型仅与对电子密度误差起放大作用的GPS射线截距权重相关的不足,提出考虑层析像素格网中的电子密度对GPS TEC的贡献建立新的迭代模型,在不同电子密度像素格网内重新分配GPS TEC实测值与其反演值之间的差距;另一方面,顾及电离层层析迭代算法中松弛因子对反演结果的影响,提出考虑电子密度变化构造新的松弛因子,抑制传播噪声对电子密度反演精度的影响.实验结果显示,相对于传统代数重构算法(ART),新方法反演的电离层电子密度剖面更接近于电离层测高仪观测的电子密度剖面,提高了电子密度反演精度.
[Abstract]:Different from the previous study of GPS ionospheric tomography, this paper improves the inversion accuracy of the GPS ionospheric tomography iterative algorithm from two aspects: on the one hand, Considering that the traditional ionospheric tomography iteration model is only related to the weight of GPS ray intercept which amplifies the electron density error, a new iterative model considering the contribution of electron density in the chromatographic pixel grid to GPS TEC is proposed. On the other hand, the effect of relaxation factor on inversion results in ionospheric tomography iteration algorithm is taken into account. A new relaxation factor considering electron density variation is proposed to suppress the influence of propagation noise on the accuracy of electron density inversion. The experimental results show that, compared with the traditional algebraic reconstruction algorithm, the inversion of the ionospheric electron density profile by the new method is closer to that observed by the ionospheric altimeter, and the precision of the inversion is improved.
【作者单位】：中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室;中国科学院光电研究院;
【基金】：国家自然科学基金(41231064,41321063,41104012,41304034,41574033,41574015) 国家重点基础研究发展计划(973计划)项目课题(2012CB825604) 中国科学院青年创新促进会(2014310)资助
【分类号】：P228.4

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