Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM14] Recent Advances in Ionosphere Observation and Modeling for Monitoring and Forecast

Thu. May 24, 2018 1:45 PM - 3:15 PM 301B (3F International Conference Hall, Makuhari Messe)

convener:Charles Lin(Department of Earth Sciences, National Cheng Kung University), Yang-Yi Sun(China University of Geosciences, Institute of Geophysics and Geomatics), Chairperson:Lin Charles, Sun Yang-Yi

2:40 PM - 2:55 PM

[PEM14-04] Characteristics of ionospheric delay gradients over Japan by using long-term GEONET data

*MAHO NAKAMURA1, Susumu Saito1, Takayuki Yoshihara1 (1.Electronic Navigation Research Institute, National Institute of Maritime, Port and Aviation Technology, Japan)

Keywords:ionosphere, plasma bubble, ionospheric gradient, GNSS, GBAS, ionospheric threat model

Ground-Based Augmentation System (GBAS) using Global navigation satellite systems (GNSS) is planned to be implemented in Japan in the near future. It is important to understand the statistical characteristic of spatial scales of ionospheric gradient for low latitude region of Japan to mitigate the effect of the ionospheric threat for GNSS. This paper presents the result of characteristics of ionospheric gradients associated with plasma bubbles based on historical GEONET data for more than 10 years. The characteristics include gradient slope, spatial scale, orientation, velocity, and their dependence on the magnetic latitude. The techniques used are the single-frequency carrier-based and code-aided (SF-CBCA) developed by Fujita et al. [2010] for gradients and the techniques developed by Saito and Yoshihara [2017] for other parameters. This research helps implementing GNSS including GBAS not only in Japan but also in the region from low to mid-latitudes.

S. Fujita, T. Yoshihara and S. Saito, “Determination of ionosphere gradient in short baselines by using single frequency measurements”, Journal of Aeronautics, Astronautics and Aviation, Series A, Vol.42, No. 4 pp.269-276(2010).

S. Saito, T. Yoshihara, S. Fujita, “Absolute gradient monitoring for GAST-D with a single-frequency carrier-phased based and code-aided technique”, 25th International Technical Meeting of the Satellite Division of The Institute of Navigation, Nashville TN, September 17-21, 2012.