ISRO successfully launches the navigation satellite IRNSS-1I to replace defective IRNSS-1A

SRIHARIKOTA, Thursday 4:04 AM: ISRO (Indian Research space organization) successfully launched the PSLV-C41 rocket carrying ISRO's eighth navigational satellite IRNSS-1I from Sriharikota and successfully placed the satellite in the designated orbit. The PSLV-C41 rocket launched off at 4.04 am from the Sathish Dhawan Space Centre [1st launch pad]. A little more than 19 minutes into the flight, the rocket threw IRNSS-1I into the orbit from where the satellite will be taken up to its last position at geosynchronous orbit at 36,000 km height.

On this great achievement, ISRO Chairman K Sivan congratulated the researchers and the scientists behind this mission. Sivan stated that for this great success, the entire ISRO team has worked very hard. He also stated that over the next 8 months, ISRO has arranged nine launch missions which also includes the moon mission to the end of this year.

The IRNSS-1I satellite is launched into orbit to replace the first IRNSS-1A satellite, whose three Rubidium atomic clocks had stopped working about two years ago. Due to the malfunctioning of the atomic clocks in IRNSS-1A, it was very difficult and hard to measure the locational data and information from the satellite. For this reason only, the ISRO team planned to replace the faulty IRNSS-1A satellite.

The launched IRNSS-1I satellite weights 1,425kg and the lifespan of this satellite is 10 years. The IRNSS-1I has become the eighth satellite to join the group of navigational satellites - NavIC (Navigation with Indian Constellation) or also known as 'desi' GPS or IRNSS. IRNSS-1I satellite has two types of payloads, (1) Navigation (2) Ranging. The navigation payload transmits signal for calculation of velocity, time and position. The ranging payload is composed of C-band transponder, which allows to calculate the exact range of the satellite. The Ranging payload also has a Corner Cube Retroreflectors for Laser ranging which Serves for civilian and military both. NavIC (Navigation with Indian Constellation) satellites are designed and developed in a way to provide precise position data services to Indian users and it also serves to its outside region (1,500 km range from its boundary)

The IRNSS-1I satellite is assembled with a new technology called the friction stir welding which will improve productivity and will also increase the payload capability of the vehicle. Thanks to the Alpha Design Technologies who played a great role in the unification of IRNSS-1I satellite. 

According to the ISRO updates, the NavIC (Navigation with Indian Constellation) will provide an advance and futuristic positioning system applications to the related position services community and will soon release the app for the user community.


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