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首页> 外文期刊>Journal of Spacecraft Technology >Design and Development of Innovative Ionospheric Models for IRNSS/NAVIC
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Design and Development of Innovative Ionospheric Models for IRNSS/NAVIC

机译：IRNSS / NAVIC创新电离层模型的设计与开发

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摘要

NavIC (Navigation with Indian Constellation)/IRNSS (Indian Regional Navigation Satellite System) is a regional navigation satellite system being developed by Indian Space Research Organization (ISRO) for providing position, velocity and timing information to its users in its service area. Ionospheric error correction for single frequency (L5) users of IRNSS is provided through a set of eight ionospheric coefficients broadcasted in the IRNSS navigation signal. These coefficients are being estimated on the ground using the regional IRNSS ionospheric data using indigenously developed technique. As the model used for the estimation of ionospheric coefficients was originally designed for global basis of ionosphere error correction, it provides about 50-60% RMS of error removal along the user's line-of-sight over Indian region. Further some parameters in the model are constantly fixed to suit the global ionosphere behaviour. Since the scope of utilization of the ionospheric model is restricted to the IRNSS service area, these constants can be tuned or computed to reflect the exact ionospheric behaviour over Indian region. In this paper, two fixed parameters in the coefficient based ionosphere model namely, A1 (constant night time delay) and A4 limit (period of diurnal ionosphere delay variation) are refined using three novel and innovative methods for performance enhancement over Indian region. The developed new models are first investigated using GAGAN (GPS Aided and GEO Augmented Navigation) ionospheric data and then validated using IRNSS ionospheric data. Based on the exhaustive empirical analysis using real measurements from GAGAN as well as IRNSS data, it was found that uniformly all the three innovative models designed provide about 65-75% of ionospheric error removal along the user's line of sight as against 50-60% error correction with the existing model in use, thereby enhancing single frequency user position accuracies of IRNSS.
机译：NaviC（带印度星座的导航）/ IRNSS（印度区域导航卫星系统）是由印度航天研究组织（ISRO）开发的区域导航卫星系统，用于向其服务区提供用户的位置，速度和时序信息。 IRNSS的单频（L5）用户的电离层误差校正通过IRNSS导航信号中广播的一组八个电离层系数提供。使用本发明的IRNSS电离层数据在地面上估计这些系数。由于用于估计电离层系数的模型最初设计用于对电离层误差校正的全局基础，因此沿着用户在印度区域的视线上提供了大约50-60％的误差。进一步的一些参数在模型中不断固定以适应全球电离层行为。由于电离层模型的利用范围仅限于IRNSS服务区域，因此可以调整或计算这些常数以反映印度区域的精确电离层行为。在本文中，基于系数的电离层模型中的两个固定参数即A1（常数夜间时间延迟）和A4极限（昼夜电离层延迟变化的时期）采用三种新颖的和创新方法来改进印度区域的性能增强。首先使用Gagan（GPS辅助和Geo增强导航）电离层数据进行开发的新模型，然后使用IRNSS电离层数据进行验证。基于使用Gagan的真实测量以及IRNSS数据的穷举实证分析，发现所有三种创新模型都设计了大约65-75％的电离层误差沿着用户的视线，与50-60％相比使用现有模型进行纠错，从而提高IRNSS的单频用户位置精度。

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