PSLV-C31 launches IRNSS-1E

This is the fifth one of the constellation of seven satellites of IRNSS

PSLV-C31 successfully put into orbit IRNSS-1E, the fifth satellite of the Indian Regional Navigation Satellite System (IRNSS) after its succesful launch from the Satish Dhawan Space Centre (SDSC), SHAR, Sriharikota, on Wednesday morning.

PSLV-C31 for the eleventh time used ‘XL’ version of PSLV.

IRNSS-1E, with a liftoff mass of 1425 kg, carried navigation payload and ranging payload, according to an ISRO release.

Some 19 minutes after it lifted off from Second Launch Pad of the SDSC at 9.31 am,, PSLV-C31 placed the satellite in precise orbit.

“PSLV C-31 rocket has successfully launched IRNSS-IE satellite in orbit,” ISRO chairman A.S. Kiran Kumar said.

However, many people waiting to watch the launch were disappointed, as the sky remained cloudy and they could catch only a glimpse of the soaring rocket for a few seconds.

The configuration of IRNSS-1E is similar to that of IRNSS-1A, 1B, 1C and 1D launched by PSLV-C22, PSLV-C24, PSLV-C26 and PSLV-C27 in July 2013, April 2014, October 2014 and March 2015 respectively.

The ranging payload of IRNSS-1E consists of a C-band transponder which facilitates accurate determination of the range of the satellite. IRNSS-1E also carries Corner Cube Retro Reflectors for laser ranging.

Besides the deployment of the constellation of seven satellites, the ground segment comprises 13 Indian Range and Integrity Monitoring Stations, a IRNSS Network Timing Centre, a ISRO Navigation Centre and a Space Control Facility.

IRNSS, an independent regional navigation satellite system, is designed to provide accurate position information service to users in India as well as the region extending up to 1,500 km from its boundary.

The system is expected to provide a position accuracy of better than 20 metre in the primary service area.