AN IMPROVED METHOD FOR GNSS OCCULTATION IONOSPHERE
VERTICAL DENSITY PROFILING WITH BENDING ANGLE
1）College of Surveying and Geoinformatics，Tongji University，Shanghai 200092
2）Key Laboratory of Modern Engineering Surveying，NASMG，Shanghai 200092
3）Gansu Industry Polytechnic College，Tianshui 741025
4）Sichuan College of Architectural Technology，Deyang 618000
Abstract：In the classical ionosphere vertical density profiling，the influence of geomagnetic field is often ignored.To improve the quality of inversion results，the geomagnetic fields should definitely be taken into account when using the bending angle to retrieve the vertical density profile with GNSS ionosphere radio occultation.Therefore，an improved approach for retrieving vertical electron density profile is proposed，which considered the geomagnetic field from International Geomagnetic Reference Fields（IGRF11）in computing TEC by excess phase for each ray path，where the TEC is changed with tangent height and its change ratio can be used to calculate the bending angles.The result of a practice experiment with COSMIC observation data shows that the approach is feasible.
Hu Chuan,Chen Yi,Wang Zhihong et al. AN IMPROVED METHOD FOR GNSS OCCULTATION IONOSPHERE
VERTICAL DENSITY PROFILING WITH BENDING ANGLE[J]. jgg, 2014, 34(5): 82-86.
