当前位置: X-MOL 学术GPS Solut. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
BeiDou Global Ionospheric delay correction Model (BDGIM): performance analysis during different levels of solar conditions
GPS Solutions ( IF 4.9 ) Pub Date : 2021-04-28 , DOI: 10.1007/s10291-021-01125-y
Ningbo Wang , Zishen Li , Yunbin Yuan , Xingliang Huo

The BeiDou-3 system uses the BeiDou Global broadcast Ionospheric delay correction Model (BDGIM) to describe global vertical total electron content (VTEC) distributions and provide ionospheric delay mitigations in single-frequency positioning. The transmission of BDGIM correction parameters in the navigation message of BeiDou-3 started in mid-2015. The limited coverage of BeiDou-3 transmitted BDGIM parameters inhibits the evaluation of model performance during different levels of solar conditions. As such, we present a method to re-estimate BDGIM correction parameters and generate model parameters during the period 2010–2017 using a small global network of 20 global navigation satellite system (GNSS) stations. Tests covering the eight years demonstrate that BDGIM can reduce the ionospheric error to less than 25% for 98% of the examined samples when compared to global ionospheric maps (GIMs) provided by the International GNSS Service (IGS), and for 90% when compared to the observed VTECs from Jason-2/3 altimetry missions. Overall, BDGIM reduces residual ionospheric delays by 10–20% compared to the ionospheric correction algorithm (ICA) of the global positioning system (GPS), the empirical International Reference Ionosphere (IRI) 2016, and our fitted NeQuick-C model. The root-mean-square (RMS) error of BDGIM increases by 32 and 21% in comparison with GIM-derived and Jason-2 observed VTECs during the geomagnetic storm in March 2015, indicating the significant degradation of model performance during the disturbed geomagnetic period.



中文翻译:

北斗全球电离层延迟校正模型(BDGIM):不同水平太阳条件下的性能分析

BeiDou-3系统使用BeiDou全球广播电离层延迟校正模型(BDGIM)来描述全球垂直总电子含量(VTEC)分布,并在单频定位中提供电离层延迟缓解功能。2015年中期开始在北斗三号导航消息中传输BDGIM校正参数。BeiDou-3传输的BDGIM参数的覆盖范围有限,因此无法在不同水平的太阳条件下评估模型性能。因此,我们提出了一种使用由20个全球导航卫星系统(GNSS)站组成的小型全球网络,重新估算BDGIM校正参数并在2010-2017年期间生成模型参数的方法。八年的测试表明,与国际GNSS服务(IGS)提供的全球电离层图(GIM)相比,对于98%的被检样品,BDGIM可以将电离层误差降低到25%以下,与到Jason-2 / 3测高任务中观察到的VTEC。总体而言,与全球定位系统(GPS),经验性国际参考电离层(IRI)2016和我们拟合的NeQuick-C模型的电离层校正算法(ICA)相比,BDGIM减少了10-20%的剩余电离层延迟。与2015年3月在地磁风暴期间观测到的VTEC相比,BDGIM的均方根(RMS)误差分别增加了32%和21%,这表明在受干扰的地磁期间模型性能显着下降。

更新日期:2021-04-29
down
wechat
bug