A paper written by Grzegorz Klopotek of Chalmers University of Technology, Sweden, in collaboration with Otsubo, is published on Journal of Geodesy.   This is a challenging research seeking a possibility of VLBI technique for precise orbit determination of Earth orbiting satellites. 

G. Klopotek, T. Hobiger, R. Haas, T. Otsubo, Geodetic VLBI for precise orbit determination of Earth satellites: a simulation study, Journal of Geodesy, 94:56, https://doi.org/10.1007/s00190-020-01381-9, 2020.