Sriharikota, Apr 12: The Indian Space Research Organisation (ISRO) launched the IRNSS-II navigation satellite, the eighth such satellite to be a part of a constellation, from Sriharikota in Andhra Pradesh on Thursday. The launch is ISRO’s second attempt at sending a replacement satellite.

PSLV-C41/IRNSS-1I Mission blasted off at 4.04 AM from the first launchpad at the Satish Dhawan Space Centre (SDHC). It was a normal lift-off, ISRO officials were quoted as saying by PTI.

IRNSS-1I is expected to replace IRNSS-1A, the first of the seven navigation satellites, that was rendered ineffective after its three rubidium atomic clocks failed. The seven satellites are part of the NavIC navigation satellite constellation.

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In August last year, ISRO attempted to send a replacement satellite but the mission of the PSLV carrying IRNSS-1H failed after the heat shield covering the satellite did not succeed in separating.

All you need to know about IRNSS-1I:

  • IRNSS-1I was launched by PSLV-C41 on Thursday morning, April 12, 2018 at 04:04 AM from SDSC SHAR, Sriharikota.
  • IRNSS-1I is the eighth navigation satellite to join the IRNSS space segment.
  • Its predecessors, IRNSS-1A, 1B, 1C, 1D, 1E, 1F and 1G were launched by PSLV-C22, PSLV-C24, PSLV-C26, PSLV-C27, PSLV-C31, PSLV-C32 and PSLV-C33 in July 2013, April 2014, October 2014, March 2015, January 2016, March 2016 and April 2016 respectively.
  • IRNSS-1I has a lift-off mass of 1425 kg. Its configuration is similar to IRNSS-1A, 1B, 1C, 1D, 1E, 1F and 1G.
  • IRNSS-1I carries two types of payloads – navigation payload and ranging payload.
  • The navigation payload of IRNSS-1I transmits signals for the determination of position, velocity and time. This payload is operating in L5-band and S-band. Rubidium atomic clocks are part of the navigation payload of the satellite.
  • The ranging payload of IRNSS-1I consists of a C-band transponder, which facilitates accurate determination of the range of the satellite. It also carries Corner Cube Retro Reflectors for LASER Ranging.

The IRNSS-1I mission takes place two weeks after the space agency launched GSAT-6A on board GSLV Mk-II. Though the rocket placed GSAT-6A in orbit, the ISRO lost communication with the satellite within two days.