Preliminary analysis of grid ionospheric vertical error for GAGAN |
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| Authors: | Niranjan Prasad A D Sarma |
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| Institution: | (1) Defence Electronics Research Laboratory, Hyderabad, India;(2) R & T Unit for Navigational Electronics, Osmania University, Hyderabad, 500 007, India |
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| Abstract: | The inverse distance weighted model (IDWM) represents a geo-spatial interpolation technique used for estimation of ionospheric
vertical delays at the ionospheric grid points (IGPs) and user ionospheric pierce points (IPPs). The GPS Aided Geo Augmented
Navigation (GAGAN) system is planned for air-navigation over the Indian service region using a space based augmentation. One
of the main needs for GAGAN is to develop a suitable grid-based ionospheric model for estimating the vertical delay and its
error bound, i.e., grid ionospheric vertical error (GIVE) at all the IGPs covering the Indian subcontinent. Dual frequency
GPS receiver data obtained from 17 total electron content (TEC) stations are considered in the analysis. For a typical IGP
(25°N, 75°E), variations in the GIVE for a few days of quiet ionosphere are presented. For a quiet and magnetically moderate
day, the mean and standard deviations of the user IPP (UIPP) estimation error and the mean GIVE are presented using the IDWM
with Klobuchar, Junkins and bilinear models. |
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| Keywords: | GAGAN GIVE IGP IPP TEC UIPP UIVE |
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