IRNSS: raw data and NMEA data. Raw

IRNSS:

Indian Regional Navigation Satellite System
(IRNSS) is India’s autonomous regional
navigation satellite system with 3 Geo-Stationary
Satellites (GEO) and 4 Geo Synchronous Satellites (GSO) satellites and state-of-the-art ground systems. GEO satellites
are located at 32.5?E, 83?E and 131.5?E longitude. The
remaining Geosynchronous satellites in orbits inclined at 29? with the equator. Two of the GSOs will 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). The inclination of IRNSS satellites with respect to equator
provides coverage at low and higher
altitudes near the poles. IRNSS provides Standard Positioning
Service (SPS) and Restricted Service (RS) to the users on dual frequencies in
L5 (1176.45 MHz) and S1 band (2492.028MHz). 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 allow 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. 

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