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Modelling of ionospheric time delay of Global Positioning System (GPS) signals using Taylor series expansion for GPS Aided Geo Augmented Navigation applications

机译:全球定位系统(GPS)信号电离层时延建模,采用泰勒级数展开,用于GPS辅助地理增强导航应用

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The positional accuracy of Indian Global Positioning System Aided Geo Augmented Navigation (GAGAN) system is affected by many errors and among them the ionospheric time delay error is the predominant error. The Indian ionosphere is characterised by large gradients, intense irregularities and equatorial anomaly conditions and hence suitable ionospheric model is necessary for GAGAN. Compared with global and regional ionospheric models, not much significant work is reported on local ionospheric models for Indian region. In this study, using Indian Satellite Based Augmentation System data, a local ionospheric model based on Taylor series expansion (TSE) is used. Initially, a network of 17 GAGAN total electron content stations data are considered in the analysis for both quiet and disturbed days. The ionospheric time delay results of the TSE model indicate that the model is performing better for quiet days than the disturbed days. The delay because of the TSE model is compared with that of the delays because of Klobuchar and IRI-2007 models and experimental GAGAN data. The obtained results shows that the TSE model is estimating delay more closely with respect to GAGAN data than that of the Klobuchar and IRI-2007 models and may be considered for use in offline applications.
机译:印度全球定位系统辅助地理增强导航(GAGAN)系统的位置精度受许多误差影响,其中电离层时延误差是主要误差。印度电离层的特点是梯度大,强烈的不规则性和赤道异常情况,因此GAGAN需要合适的电离层模型。与全球和区域电离层模型相比,印度地区局部电离层模型的报道工作量不大。在这项研究中,使用基于印度卫星的增强系统数据,使用了基于泰勒级数展开(TSE)的局部电离层模型。最初,在分析安静和受干扰的日子时,将考虑由17个GAGAN总电子含量站数据组成的网络。 TSE模型的电离层时间延迟结果表明,该模型在安静天比干扰天表现更好。将由于TSE模型引起的延迟与由于Klobuchar和IRI-2007模型以及实验GAGAN数据引起的延迟进行了比较。获得的结果表明,相对于GAGAN数据,TSE模型比Klobuchar模型和IRI-2007模型对延迟的估计更紧密,可以考虑用于离线应用程序。

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