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A comparison study of voxel based multi- and two-layer ionospheric tomography models over the Indian region using GPS data

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Three dimensional multi- and two-layer ionospheric tomographic models have been developed for the Indian region, which may provide an alternative approach for total electron content (TEC) estimation and ionospheric propagation delay correction for user aircraft for Global Positioning System Aided Geo Augmented Navigation (GAGAN). A comparative study has been carried out between multi- and two-layer models with different voxel sizes. Further comparison of two-layer models with different voxel sizes shows that from 0006 to 0017 h UT, the root mean square error (RMSE) of the slant total electron content (STEC) is least for a 10° × 10° voxel size and for the remaining hours the RMSE of the STEC is least for the 15° × 15° voxel size. The main conclusion of the analysis is that the two-layer model performs around 50% better than the multi-layer model over the Indian region.

Document Type: Research Article


Affiliations: SATCOM & IT Applications Area, Space Applications Centre, ISRO, Ahmedabad, India

Publication date: March 1, 2010

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