Abstract
Several countries are involved in developing satellite-based augmentation systems (SBAS) for improving the positional accuracy of GPS. India is also developing one such system, popularly known as GPS-aided geo-augmented navigation (GAGAN), to cater to civil aviation applications. The ionospheric effect is the major source of error in GAGAN. An appropriate efficient and accurate ionospheric time model for GAGAN is necessary. To develop such a model, data from 17 GPS stations of the GAGAN network spread across India are used in modelling. The prominent model, known as bi-linear interpolation technique, is investigated for user IPP (UIPP) delay estimation. User IPP delays for quiet, moderate and disturbed days are estimated. It is evident that measured mean UIPP delays closely follow estimated mean UIPP delays.
Highlights
Stand-alone GPS can meet the requirements of aircraft positioning applications, especially landing applications
The mean and standard deviations of user ionospheric pierce point (IPP) (UIPP) delay error are calculated: Aviation, 2013, 17(2): 65–69 a) Q should be modifed as "quiet day data" For quiet day data corresponding to 6 July 2004 (Kp < 2), the estimated mean UIPP delay and the mean UIPP delay error values are shown in figure 2
An important ionospheric algorithm known as the bilinear model is investigated for user IPP delay estimation
Summary
Education: MSc (Electronics) degree from Andhra University, Faculty of Physics, A.P, India; M.Tech (Radar and Microwave engineering) degree from Andhra University, A.P, India, Faculty of Engineering. 2001 to 2003: PhD studies, JNTUH University, Hyderabad, A.P, India, Faculty of Electronics and Communication Engineering 2007–2011. Affiliation and functions: 2003 to 2011: research assistant, junior research fellow, senior research fellow, senior research assistant, Research and Training Unit for Navigational Electronics, Osmania University, Hyderabad, A.P, India; 2011 – present, Associate Professor, Department of Electronics and Communication Engineering, KL University, Vaddeswaram, Guntur, A.P, India. Research interests: navigation electronics, global positioning system, space science, radio wave propagation. Publications: author of 12 international and 4 national research papers and 23 national and international conference papers
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