Abstract
This paper describes a comparative study of ionospheric observation over central part of India at Indore-Simrol using Indian Regional Navigation Satellite System (IRNSS) and Global Navigation Satellite System (GNSS). The IRNSS with an operational name of Navigation with Indian Constellation or NavIC, is an autonomous regional satellite navigation system. It covers India and a region extending upto 1,500 km and the system at present consists of a constellation of seven satellites. On the other hand, GNSS which comprises of GPS, GALILEO, GLONASS, etc is the standard generic term for satellite navigation systems that provide autonomous geo-spatial positioning with global coverage.
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