@article{oai:nipr.repo.nii.ac.jp:00004090,
 author = {Kondo,Tetsuro and Hama,Shin'ichi},
 journal = {Proceedings of the NIPR Symposium on Upper Atmosphere Physics},
 month = {Nov},
 note = {P(論文), Both X (8GHz) and S (2GHz) band delays between two stations out of two or more stations are measured in very long baseline interferometer (VLBI) observations for geodetic use in order to calibrate excess delays depending on the ionospheric total electron content (TEC). Using a number of observed delay differences between X and S bands, TEC at each station can be estimated by a least squares method. TEC estimated from VLBI data was compared with that obtained by the Faraday rotation measurements using a geostationary satellite beacon, and a satisfactory agreement was obtained.},
 pages = {96--104},
 title = {Estimation of total electron content using very long baseline interferometer},
 volume = {3},
 year = {1990}
}