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Chinese Journal of Space Science ›› 2018, Vol. 38 ›› Issue (1): 37-47.doi: 10.11728/cjss2018.01.037

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Effects of Ionosphere Shell Height on Ionospheric Modelingormalsize

LIU Chen1,2, LIU Changjian2, BAO Yadong3, FENG Xu2   

  1. 1. Beijing Satellite Navigation Center, Beijing 100094;
    2. School of Surveying and Mapping, Information Engineering University, Zhengzhou 450001;
    3. Xi'an Division of Surveying and Mapping, Xi'an 710054
  • Received:2017-03-12 Revised:2017-08-26 Online:2018-01-15 Published:2018-01-16

Abstract:

The spatial-temporal variations of shell height are analyzed by utilizing IRI2012 model. The method for precision evaluation of the ionosphere models based on STEC differences in applications is presented, and the relevant influences of shell height on the positions of Ionospheric Pierce Point (IPP), mapping function, ionospheric modeling, ionospheric elaboration and ionospheric accuracy evaluation are discussed. When satellite elevation cut-off angle is set to be 10°, the shell height has important impact on the above quantities. The maximum deviation in latitude or longitude is about 3.2°. The maximum error of mapping function is about 15.46%. The maximum deviation and practical error are about 9.71%, 3.64% respectively. The maximum error in ionospheric elaborations is about 9.26%, and the maximum error in ionospheric accuracy evaluation is about 9.62%. According to the above results, the following suggestions are given. Firstly, a shell height model and a larger elevation cut-off angle should be adopted to reduce the above errors. Secondly, when a fixed shell height is adopted, the same height should be used in regional ionospheric modeling. Thirdly, the shell height of reference data should be the same to the be-assessed data in accuracy assessment.

Key words: Ionosphere shell height, Modeling error, Practical error, Elaboration error, Accuracy evaluation error

CLC Number: