Other
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001crlj...48..151s&link_type=abstract
Journal of the Communications Research Laboratory. Special Issue: Large Aperture Radio Telescopes at Kashima Space Research Cent
Other
Evaluation, Global Positioning System, Ionospheric Electron Density, Electron Counters, Accuracy, Frequencies, Europe, Estimating, Domains, Consistency, Astrometry
Scientific paper
We evaluated the accuracy of GPS-based TEC measurements by comparing the results with S/X dual frequency VLBI experimental data. The Global Ionosphere Maps (GIMs) generated by CODE (Center for Orbit Determination in Europe) is one of the most accurate and freely available GPS-derived ionosphere maps, so we evaluated the accuracy of the GIM/CODE maps. Sekido et al. have demonstrated that ionospheric group delays computed from GIM/CODE agree with the ionospheric TEC measured by VLBI to an accuracy of 3-10% of the total contribution of TEC to the VLBI observation. Following on this research, this paper presents a comparison between the phase delay rate calculated from the GIM/CODE and phase delay rate measured by VLBI observations. The correlation between the ionospheric phase delay rates obtained from VLBI observation and those obtained from the GIM/CODE data were not as high as in the case of group delay. The main reason for the lower coincidence is that the GIM/CODE data does not contain short period variation components in the temporal and spatial domains. Using the GIM/CODE data, we have applied ionospheric delay correction to single-band astrometric VLBI data. This resulted in improved consistency between the group delay and observed phase delay rate, and estimated pulsar coordinate solutions that were more stable than those obtained without ionosphere correction. The proper motion obtained from this ionospheric-delay-corrected VLBI data agrees well with the other proper motion measurements.
Hanado Yuko
Imae Michito
Kawai Eiji
Kondo Tetsuro
Sekido Mamoru
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