Other
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001crlrv..47..155s&link_type=abstract
Review of the Communications Research Laboratory, vol. 47, p. 155
Other
Evaluation, Global Positioning System, Ionospheric Currents, Electron Density (Concentration), Very Long Base Interferometry, Pulsars, Orbit Determination, Frequencies, Estimating, Accuracy
Scientific paper
GPS-based TEC measurement accuracy was evaluated by comparison with the S/X dual frequency VLBI experiment data. The global ionosphere map (GIM) generated by the Center for Orbit Determination in Europe (CODE) is one of the most accurate GPS derived ionosphere map available, thus we used this GIM/CODE for the evaluation. Sekido et al., demonstrated that ionospheric group delays computed from the GIM/CODE agree with the ionospheric TEC measured by VLBI with an accuracy of 3-10% of the total TEC included in the VLBI observation. A comparison between the phase-delay rate calculated from the GIM/CODE and a counterpart of the VLBI observation is presented in this paper. The correlation of the ionospheric phase-delay rates between VLBI observation and the GIM/CODE data was not so high, as in the case of the group delay. The main reason for the lower coincidence is that the GIM/CODE data do not contain high-frequency components in both the time and space domains. Application of ionospheric delay correction to single-band astrometric VLBI data using the GIM/CODE data was performed. Consequently, the consistency of the observable group-delay and phase-delay rate was improved and the estimated pulsar coordinates solutions were stabilized compared to the cases of no ionosphere correction. Proper motion obtained from the ionospheric-delay corrected VLBI data agreed well with other proper motion measurement results.
Hanado Yuko
Imae Michito
Kawai Eiji
Kondo Tetsuro
Sekido Mamoru
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