Indian Segment is placed with seven different state-of-the-art
Indian Regional Navigation Satellite System (IRNSS) is India’s own regional independent navigational satellite system. IRNSS consists of 3 segments. Namely space segment, User segment and Ground Segment. Space Segment consists of 3 Geo-Stationary Satellites (GEO) and 4 Geo-Synchronous Satellites. GEO satellites are located at 32.5?E, 83?E and 131.5?E longitude. The remaining GSOs in orbits inclined at 29? with the equator. Two of the GSOs cross the equator at 55?E and other two are at 111.75? E. IRNSS satellites are identified by their PRN numbers, which range from 1 to 12 with system ID is IRi1 ( IRNSS ICD-2014). Ground Segment is placed with seven different state-of-the-art functioning stations situated across the India (webref.1). User segment consists of dual frequency positioning system. These are systems are designed to receive IRNSS transmits frequencies L5 and S band frequencies and main lobe bandwidths of these signals are correspondingly 1176.45 MHz; +/- 1MHz 2492.028MHz; +/- 1MHz. Under a Memorandum of Understanding (MoU) with Space Application Centre (SAC), Indian Space Research Organisation (ISRO), Ahmedabad, IRNSS receiver was installed at CBIT, Hyderabad, (17.39°N, 78.31°E). IRNSS receiver generates data precisely with respect to the internal trigger with a 1 Pulse Per Second (PPS). The data is stored in two different formats, namely, raw data and NMEA data. Raw data is a binary file that can be converted using an individual software provided by Accord Software Pvt. Ltd. The two data formats generated by the software are namely, Receiver Independent Exchange (RINEX) and Comma Separated Value (CSV) format. CSV files store the tabular data in a plain text format. CSV files allows the user to convert the files into different spreadsheet programs (Shafranovich, 2005). The receiver provides several parameters including 3D RMS user position (ECEF), satellite position (elevation, azimuthal in degrees) and signal strength (dB-Hz) in these CSV files. Minimum operating received signal strength (C/N0) is 36 dB-Hz. Signal acquisition sensitivity is -165dBW (or -135dBm). Receiver self-error contribution is very nominal and is approximately <0.15m at C/N0 > 42dB-Hz. Frequency tracking range is .
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