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Wide-area ionospheric delay model for GNSS users in middle- and low-magnetic-latitude regions

机译：中低纬度地区GNSS用户的广域电离层延迟模型

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摘要

A useful ionospheric delay model to compensate for the effect of ionospheric error on GNSS service over continent-wide areas or oceans is the Satellite-Based Augmentation System's wide-area thin-shell planar fit ionospheric grid model. In order to implement a proper wide-area ionospheric delay model in the Asia-Pacific region to reflect the variation introduced by local ionospheric activity, the present study develops a proper ionospheric delay model to correct ionospheric error in middle- and low-magnetic-latitude regions. Specifically, the proposed ionospheric delay model uses several dual-frequency GNSS reference stations distributed in Taiwan, South Korea, Japan, and China as grid points in place of the conventional grid points generated by ionospheric pierce points. The ionospheric delays observed at the reference stations are processed and provided to the user, who can then construct the ionospheric delay model using weighted least squares with the distances between the user and the stations as weights. This proposed ionospheric delay model lowers the computation load by eliminating the conversion of delays at the ionospheric pierce points to those at the grid points and provides good descriptions of dynamic variations due to the ionospheric activities. Also, a simplified model is developed to further reduce its computation load while providing almost the same service as that of the original proposed model. A selection mechanism between the original proposed model and its simplified version is developed as well. The details of the proposed ionospheric delay model are explained, and experiments conducted using data collected from the reference stations in the Asia-Pacific region are presented. The effectiveness of the proposed model is validated by comparison with the conventional wide-area thin-shell planar fit ionospheric grid model provided by the Japanese Multi-functional Satellite Augmentation System under both nominal and disturbed ionospheric conditions.
机译：基于卫星的增强系统的广域薄壳平面拟合电离层网格模型是一种有用的电离层延迟模型，用于补偿电离层误差对整个大陆或海洋上的GNSS服务的影响。为了在亚太地区实施适当的广域电离层延迟模型以反映当地电离层活动引起的变化，本研究开发了一种适当的电离层延迟模型来校正中低纬度的电离层误差地区。具体而言，提出的电离层延迟模型使用分布在台湾，韩国，日本和中国的几个双频GNSS参考站作为网格点，代替了由电离层穿透点生成的常规网格点。处理在参考站观测到的电离层延迟并将其提供给用户，然后用户可以使用加权最小二乘以用户和测站之间的距离作为权重来构建电离层延迟模型。提出的电离层延迟模型通过消除电离层穿刺点到网格点处的延迟转换而降低了计算负荷，并很好地描述了由于电离层活动引起的动态变化。另外，开发了简化模型以进一步减少其计算负荷，同时提供与原始提议模型几乎相同的服务。还开发了原始建议模型与其简化版本之间的选择机制。解释了所建议的电离层延迟模型的细节，并介绍了使用从亚太地区参考站收集的数据进行的实验。通过与日本多功能卫星增强系统在标称电离层和干扰电离层条件下提供的常规广域薄壳平面拟合电离层网格模型进行比较，验证了该模型的有效性。

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