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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Electron Density Reconstruction by Ionospheric Tomography From the Combination of GNSS and Upcoming LEO Constellations
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Electron Density Reconstruction by Ionospheric Tomography From the Combination of GNSS and Upcoming LEO Constellations

机译：通过电离层电子密度重建从GNSS和断层即将到来的LEO星座

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摘要

Computerized ionospheric tomography (CIT) based on Global Navigation Satellite System (GNSS) data is a worthwhile project. However, predominant issues like unevenly distributed stations, lack of data, and high-elevation GNSS signals could affect the precise information about the ionosphere. To address this problem, many previous studies were mainly improving tomographic algorithms, rather than incorporating multisource data such as data from rapidly developed upcoming Low-Earth-Orbit (LEO) satellites. In this paper, the potential improvements of GNSS-based ionospheric tomography at a global scale by combining the upcoming LEO constellations is investigated. On this basis, some numerical experiments were conducted to evaluate the performances of LEO-augmented GNSS ionospheric tomography. Specifically, the slant total electron contents (STEC) required for ionospheric tomography from ground receivers to GNSS (including GPS, GLONASS, BDS, and Galileo) and LEO satellites are simulated by the international reference ionosphere (IRI-2016) model during low and high solar activity in 2018 and 2014, respectively. The simulated STEC values from single-, double- and quad systems of GNSS constellations were first used for ionospheric tomography. Afterward, the GNSS-based STEC values were combined with the LEO-based simulated STEC values. The STEC values directly derived from the IRI-2016 model that have not been used in ionospheric tomography were used as independent references. The results showed that the GNSS + LEO solutions outperform the GNSS-only solutions overall, the STEC values obtained by GNSS + LEO solutions are more consistent with the STEC references during both high and low years of solar activity. In comparison with the STEC references, the RMS values of the CITderived STEC for GNSS-only solutions can be decreased by 15% and 20.3% at most during low and high years of solar activity, respectively.
机译：电脑电离层断层扫描(CIT)的基础上全球导航卫星系统(GNSS)的数据一个有价值的项目。像不均,缺乏数据,和高架GNSS信号可能影响电离层的精确信息。解决这一问题,许多先前的研究主要是提高层析算法,而比融合多源数据等数据迅速从即将到来的数量的近地发展(狮子座)卫星。改进的GNSS-based电离层断层在全球范围内通过结合即将到来的狮子座星座是调查。一些数值实验评估LEO-augmented GNSS的表演电离层断层。总电子含量(STEC)所需电离层断层从地面接收器GNSS(包括GPS、GLONASS BDS,伽利略)和LEO卫星是模拟的国际参考电离层(iri - 2016)模型在低和高在2018年太阳活动和2014年,分别。从单、双和四的GNSS系统星座最先用于电离层断层扫描。结合LEO-based模拟STEC吗值。iri - 2016模型尚未使用电离层断层被用作独立参考文献狮子座的解决方案超越GNSS-only解决方案总的来说,STEC GNSS +利奥得到的值更符合STEC的解决方案在高和低年的引用太阳活动。引用,CITderived STEC的有效值GNSS-only解决方案可以减少了15%和20.3%最多在低和高的太阳活动。

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