Accuracy Assessment of Klobuchar Model and NeQuick Model in China
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摘要: 将CODE以及GPS广播星历提供的8个系数分别作为Klobuchar模型的输入参数,利用Klobuchar模型及NeQuick模型计算得到中国地壳运动观测网15个GPS基准站上2000～2008年的电离层VTEC序列,以欧洲定轨中心CODE提供的事后电离层产品作为参考标准,得到了两个模型在中国地区的精度评估结果。
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关键词:
- Klobuchar模型 /
- NeQuick模型 /
- 球谐函数模型 /
- 精度评估
Abstract: Klobuchar model is used for ionospheric delay correction by GPS,and NeQuick model is used by the Galileo system with the same purpose in the single frequency mode.We consider ionosphere products that are post-processed by Center for Orbit Determination in Europe as reference,taking advantage of vertical TEC data provided by Klobuchar and NeQuick model for the 15 GPS basic stations in Crustal Movement Observation Network of China from the year 2000 to 2008.And the eight coefficients for Klobuchar model will be provided by CODE and GPS navigation message respectively,we analyze the application of the two models in the Chinese region.① It is more obvious that the bias of Klobuchar model will increase with respect to the lowering of latitude.Both NeQuick and Klobuchar model of GPS broadcasting are observed to have stronger links to the periodic variations of solar activities.② There are relatively large standard deviation which has excluded bias,in the two models in peak year of solar activity and low latitude region.yet on the whole,NeQuick model produces the least standard deviation.③ The fact that the two models,when applied to the area of China,show regular variation depending on solar activities and latitude,provide with the possibility and basis of the further optimization and improvment of them.-
Keywords:
- Klobuchar model /
- NeQuick model /
- spherical harmonics model /
- accuracy assessment
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