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Mission type Navigation
Operator ISRO
COSPAR ID 2016-027A
SATCAT no. 41469
Mission duration 12 years
Spacecraft properties
Spacecraft IRNSS-1G
Spacecraft type Satellite
Bus I-1K
Manufacturer ISRO Satellite Centre
Space Applications Centre
Launch mass 1,425 kilograms (3,142 lb)
Dry mass 598 kilograms (1,318 lb)
Power 1600 W
Start of mission
Launch date 12:50:00, April 28, 2016 (2016-04-28T12:50:00)
Rocket PSLV-XL C33
Launch site Satish Dhawan (First)
Contractor ISRO
Orbital parameters
Reference system Geocentric
Regime Geosynchronous Orbit (GSO)
Longitude 129.429213 East
Perigee 35,780.961 km (22,233.258 mi)[1]
Apogee 35,796.200 km (22,242.727 mi)[1]
Inclination 4.2637
Period 23:56:12.33
Epoch 17151.68965311

IRNSS-1G was the seventh and final[2] of the Indian Regional Navigation Satellite System (IRNSS) series of satellites after IRNSS-1A, IRNSS-1B, IRNSS-1C, IRNSS-1D, IRNSS-1E and IRNSS-1F. This system of satellites will provide navigational services to the Indian region. The satellite was placed in geosynchronous orbit successfully on April 28, 2016 at 12:50–pm IST.[2]


The satellite was launched from the First Launch Pad (FLP) of Satish Dhawan Space Centre, Sriharikota on board PSLV-C33.[2] The countdown of the launch had begun 51:30 hours before at 9:20 a.m. IST on 25 April.[3]

After the launch of IRNSS-1G the Indian government named the IRNSS system as NAVIC (Navigation Indian Constellation).


The satellite is designed for 12 years of life.[3] It has a lift-off mass of 1,425 kilograms (3,142 lb) and dry mass of 598 kilograms (1,318 lb).[4] The ranging payload of IRNSS-1G consists of a C-band transponder (automatic receivers and transmitters of radio signals) which facilitates accurate determination of the range of the satellite.[5] It would operate in L-5 and S band spectrums and also has a Rubidium atomic clock.[6] Special thermal control systems are used for key components like this clock. Two panels of solar cells are used to generate 1660W of energy and one Litium-ion 90A-hr battery is used.[4] The satellite is placed in an orbit at an altitude of 497.8 kilometres (309.3 mi) at 129.5 deg East longitude.[4][7] It cost approximately 125 crore (US$18 million).[8]

The "XL" version of PSLV was used with six strap-ons for the launch. Each strap-on used 12 metric tons (12 long tons; 13 short tons) of propellant. ISRO has successfully used PSLV 34 times and the XL version 12 times before the launch of IRNSS-1G.[9]

See also[edit]


  1. ^ a b "NORAD Catalog Number 41469". NORAD. Retrieved 2 June 2017. 
  2. ^ a b c "India launches seventh navigation satellite, to get its own GPS". The Hindu. April 28, 2016. Retrieved April 28, 2016. 
  3. ^ a b PTI (26 April 2016). "Countdown for IRNSS-1G launch begins at Sriharikota". The Hindu. Retrieved 28 April 2016. 
  4. ^ a b c "PSLV-C33 - IRNSS-1G Specifications" (PDF). ISRO. Retrieved 28 April 2016. 
  5. ^ "'Isro launches rocket carrying India's seventh navigation satellite'". Business Standard. April 28, 2016. Retrieved April 28, 2016. 
  6. ^ "IRNSS-1G". ISRO. Retrieved 28 April 2016. 
  7. ^ Sangeeta Ojha (28 April 2016). "India's own navigation satellite IRNSS-1G launched: All you need to know about it". India Today. Retrieved 28 April 2016. 
  8. ^ Vanita Srivastava (1 May 2016). "IRNSS: Desi GPS to liberate India from dependence on US, Russia". Economic Times. Retrieved 2 May 2016. 
  9. ^ "PSLV-C33/IRNSS-1G". ISRO. Retrieved 28 April 2016. 

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