Indian regional satellite system (IRNSS) by ISRO is satellite system of India. IRNSS is used for a variety of applications. It provides navigation and timing services to all the users. For using it for navigation purposes the data extracted from the receiver is to be pre-processed before using it for position estimation or for applying any algorithms. Initially the raw data is taken from the receiver and converted into RINEX format using the receiver converter software. In this paper, the processing of RINEX data extracted from the receiver is explained which results in extraction of all the ephemeris parameters from navigation file of RINEX data and pseudoranges from the observation file. The parameters thus extracted can be used with development of various algorithms or can be used for any application. The results indicate extraction of the parameters corresponding to RINEX 3.03 version navigation and observation files of 24 hour data.

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