Ionospheric Error Analysis of Indian WAAS

A. D. Sarma, G. Sasi Bhushana Rao and V. Venkata Rao

Abstract:	For safe and secure navigation and landing through augmented GPS system, availability of satellite vehicles, accuracy of the ranging signal, integrity of the incoming signals and continuity of the information are the most four important factors. For precision approach aircraft landings, ionospheric corrections take precedence over these four factors especially as India comes under equatorial region where ionospheric conditions are severe and erratic. A dedicated and modified WAAS system for India is necessary. The main objective of this paper is to carry out ionospheric error analysis of the proposed Indian WAAS (INWAAS) system. In this paper the procedure for identifying ionospheric reference stations for Indian subcontinent based on FAA's WAAS is briefly mentioned. This paper describes an algorithm which estimates required ionospheric correction for the proposed Indian WAAS. The algorithm uses values related to an Indian station and the initial results confirmed the validity of the algorithm. Here, we used the IRI-90 model to predict the vertical ionospheric delays at the measured IPPs and at the specified IGPs. Twenty ionospheric wide area reference stations (WRSs) for Indian WAAS are proposed.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	1157 - 1164
Cite this article:	Sarma, A. D., Rao, G. Sasi Bhushana, Rao, V. Venkata, "Ionospheric Error Analysis of Indian WAAS," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 1157-1164.
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