Quasi real-time positioning of spacecrafts using the Internet VLBI system
We started the development of a quasi real time technique for spacecraft positioning by using the Internet-VLBI system in collaboration with the Institute of Space and Astronautical Science (ISAS). A series of VLBI observations receiving the signals from Japanese spacecraft GEOTAIL and NOZOMI have been carried out since June, 2002 to establish an observation method and to evaluate the measurement accuracy. At present it is possible to obtain the time delay which is a VLBI observable to use for satellite positioning within a few days after observations. Orbital determination software is under development in parallel to the improvement of observation data processing software. Phase delay measurement software is also under development to increase the measurement accuracy.
KeywordsInternet VLBI Delta VLBI
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