利用 NavIC 卫星系统评估电离层斜面总电子含量的动态属性和可变性

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
Raj Gusain, Anurag Vidyarthi, Rishi Prakash, A. K. Shukla
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引用次数: 0

摘要

电离层是一种不均匀和各向异性的自然介质。它导致全球导航卫星系统(GNSS)的定位性能下降。一般来说,垂直电子总含量(VTEC)用于描述电离层的特征。本研究可进一步用于提高印度星座导航(NavIC)双频接收器的定位精度,尤其是在仰角一直很低的印度北部地区。在这种低仰角情况下,将斜面总电子含量(STEC)转换为 VTEC 会产生误差,反之亦然。因此,本研究直接使用 STEC 而不是 VTEC。STEC 可用于分析电离层的动态变化,研究局部和区域电离层扰动。STEC 取决于各种因素,如太阳活动、卫星仰角和方位角、季节变化等。因此,有必要评估 STEC 的动态属性和可变性,以便在任何电离层条件下保持高精度。本研究论文侧重于利用印度星座导航(NavIC)卫星系统对电离层斜面总电子含量的动态属性和可变性进行评估。本研究利用 19 个月(2017 年 6 月至 2018 年 12 月)的双频 NavIC 数据来计算和分析 STEC。结果显示,卫星仰角、方位角和 STEC 季节性变化的影响很大。讨论强调了NavIC地球静止卫星(PRN3、PRN6和PRN7)在电离层研究、空间气象应用和识别局部电离层不规则性方面的适用性。研究结果表明,考虑 STEC 的动态属性和可变性对模型应用非常重要,可在电离层出现任何不规则情况时保持高精度。此外,这项研究可作为今后使用 NavIC 系统进行电离层-质球研究和空间气象应用领域研究的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Evaluation of Dynamic Attributes and Variability of Ionospheric Slant Total Electron Content Using NavIC Satellite System

Evaluation of Dynamic Attributes and Variability of Ionospheric Slant Total Electron Content Using NavIC Satellite System

The ionosphere is an inhomogeneous and anisotropic medium in nature. It causes degradation in the performance of positioning through Global Navigation Satellite Systems (GNSS). Generally, the vertical total electron content (VTEC) is used to characterize the ionosphere. The present study can further be used to enhance positional accuracy with a Navigation with Indian Constellation (NavIC) dual-frequency receiver, especially in the Northern region of India where the elevation angle is consistently very low. At such low elevation angles, converting Slant Total Electron Content (STEC) to VTEC and vice versa introduces errors. Therefore, in this study, STEC is used directly instead of VTEC. STEC can be used to analyze dynamic variations in the ionosphere and investigate local and regional ionospheric disturbances. The STEC is dependent on various factors such as solar activity, elevation and azimuth angle of the satellite, seasonal variation etc. Therefore, it is necessary to evaluate the dynamic attributes and variability of STEC to maintain high accuracy in any ionospheric conditions. This research paper focuses on the evaluation of dynamic attributes and variability of Ionospheric Slant Total Electron Content using Navigation with Indian Constellation (NavIC) satellite system. This study utilizes 19 months (from June 2017 to December 2018) dual frequency NavIC data to compute and analyze STEC. The results show a significant effect of satellite elevation angle, azimuth angle, and seasonal STEC variability. The discussion highlights the suitability of NavIC geostationary satellites (PRN3, PRN6, and PRN7) of NavIC for ionospheric studies, space weather applications, and identification of local ionospheric irregularities. The research findings demonstrate the importance of considering dynamic attributes and variability of STEC to model applications for maintaining high accuracy in case of any ionospheric irregularity. Additionally, this research could serve as a reference for future studies in the field of ionospheric-plasmapheric studies and space weather applications using NavIC system.

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来源期刊
Geomagnetism and Aeronomy
Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science
CiteScore
1.30
自引率
33.30%
发文量
65
审稿时长
4-8 weeks
期刊介绍: Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.
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