JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Poster

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

[P-EM22] [JJ] Physics and Chemistry in the Atmosphere and Ionosphere

Wed. May 24, 2017 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL7)

[PEM22-P06] Expansion of ionospheric TEC observation from measurements of single frequency GPS signals

*Yoshitaka Goto1, Win Zaw Hein1, Atsushi Matsui1, Yoshiya Kasahara1 (1.Graduate School of Natural Science and Technology)

Keywords:Single frequency GPS signal, Ionospheric TEC, Bias estimation

Monitoring of the ionospheric total electron content (TEC) using observational networks of GNSS signals is now popular in many countries. Most of the networks are built in mid latitude regions. It is important to expand them in low latitudes where many interesting phenomena of ionospheric plasma exist. The purpose of this study is to develop an estimation method of the ionospheric TEC using not multi-frequency receiver but single frequency ones, and expand an observation network in low latitude region at low costs.
Two observables are obtained from single frequency GPS measurements; code pseudorange and carrier phase. In these observables, the ionospheric effect appears plus and minus, respectively. The ionospheric effect is, then, derived by their difference while it includes a bias error. For the estimation of the bias error, the TEC distribution is assumed to be represented by two-dimensional (latitude-longitude) model with a polynomial function in each dimension. A thin layer model is assumed for altitude distribution of the ionospheric plasma. Ranging errors except for the ionospheric effect and receiver clock error in code pseudorange measurements are removed using precise ephemeris and existing appropriate models. Accuracy of the bias estimation is a few TECU that is equivalent to standard deviation of measurement error of the code pseudorange.
We are now planning to build continuous observation site in a low latitude region.