Consistency of the DORIS and GPS assessments for real-time global ionospheric maps

Wang Ningbo (Academy of Opto-Electronics, Chinese Academy of Science, China)


Zishen Li (Academy of Opto-Electronics, Chinese Academy of Science, China)

Event: 2018 IDS Workshop

Session: SESSION IV: Research activities and new applications

Presentation type: Type Oral

With the availability of the International GNSS Services (IGS) global and other regional real-time (RT) data streams containing multi-frequency and multi-constellation GNSS measurements, different techniques have been developed to provide Global Ionospheric Maps (GIMs) of vertical Total Electron Content (TEC) in real-time mode. To validate the qualities of different ionospheric electron content models, the vertical and slant TECs extracted from altimeter and Global Positioning System (GPS) satellites are commonly used as references. When comparing with ground-based GPS TECs over the continental regions, a small set of receivers should be identified to perform an external assessment with the receivers not contributing to GIM generation. When comparing with altimeter TECs, it provides a fairly independent way for the assessment, but only covers the oceanic regions.

The high quality dual-frequency phase measurements from Doppler orthography and radio positioning integrated by satellite (DORIS) system provide a valuable opportunity to examine the Earth’s ionosphere, especially given the growing number of satellite missions with DORIS receivers on board as well as the globally homogeneous distribution of DORIS ground beacons. Due to the difference of the two frequencies of DORIS (a relative frequency ratio close to 5), this technique is expected to be more sensitive to detect the ionospheric information and less prone to measurement errors. In this contribution, the consistency of the difference of slant TECs (dsTEC) derived from the dual-frequency phase observations of DORIS and GPS is performed by comparing with the RT-GIMs provided by the Chinese Academy of Sciences (CAS) and Technical University of Catalonia (UPC) at the selected worldwide distributed DORIS and GPS stations, covering the time period of 2017-2018. We expect that the DORIS-derived TEC information is accurate enough to validate the ionospheric electron content models like the GIM products of the IGS in an external and independent way, which can further contribute to global RT ionospheric TEC modeling if RT or NRT DORIS data is coming to be available.

Oral presentation show times:

Room Start Date End Date
Lagoa Do Fogo Tue, Sep 25 2018,16:30 Tue, Sep 25 2018,16:50
Wang Ningbo
Academy of Opto-Electronics, Chinese Academy of Science