Evaluation of ionospheric VTEC inversion performance for BDS GEO satellites
Geostationary Earth orbit(GEO)satellites of BeiDou navigation satellite system(BDS)can continuously observe the fixed puncture point's total electron content(TEC)and provide reliable constraints for refining the ionospheric model,however,the detection range of BDS GEO satellites contains more than 20 000 km of dilute plasma,thus in order to further study the impact of BDS GEO satellites on TEC inversion,the paper proposed a perfromance evaluation method:the vertical total electron content(VTEC)at the ionospheric puncture point was extracted by using dual-frequency observation data from BDS GEO satellites;and then the variation characteristics of VTEC at the puncture point were analyzed and compared with the reversed VTEC of global ionospheric map(GIM)and the adjacent medium Earth orbit(MEO)satellites;finally,an empirical electron model was used as a reference to evaluate the TEC of the plasma layer detected by the two kinds of satellites.Results showed that the GEO-VTEC in the study area could be in good agreement with the GIM;and under different geomagnetic conditions,the root mean square of the deviation between GEO-VTEC and MEO-VTEC would be close,with a maximum difference of no more than 2.46 total electron content units;moreover,the TEC values of the plasma layer detected by GEO and MEO satellites would be similar,and the influence of plasma above 20 000 km on TEC could be ignored;in general,it could be demonstrated that the performance of GEO-VTEC could be consistent with common ionospheric products and MEO-VTEC.
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