Klobuchar Like Regional Ionospheric Models -Further Investigation and Results

DOI Web Site 参考文献4件
  • Nishimoto K.
    Department of Electrical and Electronic Engineering, Ritsumeikan University
  • Ohashi M.
    Department of Electrical and Electronic Engineering, Ritsumeikan University
  • Kubo Y.
    Department of Electrical and Electronic Engineering, Ritsumeikan University
  • Sugimoto S.
    Department of Electrical and Electronic Engineering, Ritsumeikan University

抄録

Ionosheric delay is one of the major error sources in GNSS (Global Navigation Satellite System) positioning. For single frequency system, it is very important to effectively correct the ionospheric delay and the so-called Klobuchar model has been widely used due to its well known properties such as computational simplicity. The Klobuchar model is one of the global ionospheric models, and it can correct about 50% RMS ionospheric errors[1]. On the other hand, there are some models that can achieve better accuracy than the Klobuchar model, the SCHA (Spherical Cap Harmonics Analysis) model is one of such models. By the SCHA model, it has been reported that the ionospheric delays can be well modeled in the regional area such as the sky over Japan[2, 3]. In this paper, we investigate the parameter which is assumed to be constant in the Klobuchar model as well as Klobuchar like models in [4, 5, 6], and try to improve the model accuracy by assuming the parameter as a function of the geomagnetic latitude. Also, the positioning results based on the Klobuchar like models are compared by experiments using long term (half year) observation data.

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