PSLV-C31 successfully launched IRNSS-1E satellite


Who: IRNSS-1E satellite
Where: SHAR, Andhra Pradesh
What: Successfully launched by ISRO’s PSLV-C31
When: 20 January 2016

The Indian Space Research Organisation (ISRO) on 20 January 2016 successfully launched the Indian Regional Navigational Satellite System (IRNSS) 1-E satellite. The satellite will provide navigation, tracking and mapping services to the Indian sub continent.

The satellite is the fifth of the IRNSS constellation. It was launched from the Satish Dhawan Space Centre (SHAR), Sriharikota in Andhra Pradesh on-board the PSLV-C31.


The Polar Satellite Launch Vehicle (PSLV)-C31 was the 32nd consecutively successful mission of the PSLV. The ‘XL’ configuration of PSLV was used for this mission.

This is the eleventh time ‘XL’ configuration was flown, earlier ten being PSLV-C11/Chandrayaan-1, PSLV-C17/GSAT-12, PSLV-C19/RISAT-1, PSLV-C22/IRNSS-1A, PSLV-C25/Mars Orbiter Spacecraft, PSLV-C24/IRNSS-1B, PSLV-C26/IRNSS-1C, PSLV-C27/IRNSS-1D, PSLV-C28/DMC-3 and PSLV-C30/ASTROSAT  missions.

Features of IRNSS-1E

• IRNSS-1E, weighing 1425 kg, is the fifth of the seven satellitesconstituting the IRNSS.
• IRNSS-1A, 1B and 1C and 1D, the first four satellites of the constellation, were successfully launched by PSLV in July 2013, April 2014, October 2014 and March 2015 respectively.
• IRNSS -1E carries two types of payloads – navigation payload and ranging payload.
• The navigation payload of IRNSS-1E will transmit navigation service signals to the users. This payload will be operating in L5-band and S-band.
• A highly accurate Rubidium atomic clock is part of the navigation payload of the satellite.
• 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.

Features of IRNSS

• It consists of seven satellites to provide real-time data on the position of objects to aid road, air and maritime traffic apart from providing mapping and tracking services.
• It is an independent regional navigation satellite system designed to provide position information in the Indian region and 1500 km around the Indian mainland.
• It would provide two types of services, namely, Standard Positioning Services (SPS), which will be provided to all users, and Restricted Services (RS) that will be provided to authorised users only.
• Out of the seven satellites of the system, three are geostationary and four are non-geostationary.
• The remaining satellites of this constellation, namely, IRNSS-1F and IRNSS-1G, are expected to be launched in February 2016 and March 2016 respectively.
• By using the IRNSS as a platform, the Government of India is planning to launch its own Global Navigational Satellite Services, GINS (Global Indian Navigation Satellite) system. It is similar to the Global Positioning System (GPS) of the USA.