IRNSS-1G

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]

PSLV-C33/IRNSS-1G
Mission typeNavigation
OperatorISRO
COSPAR ID2016-027A
SATCAT no.41469
Mission duration12 years
Spacecraft properties
SpacecraftIRNSS-1G
Spacecraft typeSatellite
BusI-1K
ManufacturerISRO Satellite Centre
Space Applications Centre
Launch mass1,425 kilograms (3,142 lb)
Dry mass598 kilograms (1,318 lb)
Power1600 W
Start of mission
Launch date12:50:00, April 28, 2016 (UTC+05:30) (2016-04-28T12:50:00UTC+05:30)
RocketPSLV-XL C33
Launch siteSatish Dhawan (First)
ContractorISRO
Orbital parameters
Reference systemGeocentric
RegimeGeosynchronous Orbit (GSO)
Longitude129.429213 East
Perigee altitude35,780.961 km (22,233.258 mi)[1]
Apogee altitude35,796.200 km (22,242.727 mi)[1]
Inclination4.2637
Period23:56:12.33
Epoch17151.68965311
 

Launch

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).

Specifications

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 Lithium-ion 90A-hr battery is used.[4] The satellite is placed in an orbit at an altitude of 35,788.5 kilometres (22,237.9 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]

Animation of IRNSS
Around the Earth
Around the Earth - Polar view
Earth fixed frame - Equatorial view, front
Earth fixed frame - Equatorial view, side
Earth fixed frame - Polar view
   Earth ·   IRNSS-1B  ·   IRNSS-1C  ·   IRNSS-1E  ·   IRNSS-1F  ·   IRNSS-1G  ·   IRNSS-1I

See also

References
  1. "NORAD Catalog Number 41469". NORAD. Retrieved 2 June 2017.
  2. "India launches seventh navigation satellite, to get its own GPS". The Hindu. 28 April 2016. Retrieved 28 April 2016.
  3. PTI (26 April 2016). "Countdown for IRNSS-1G launch begins at Sriharikota". The Hindu. Retrieved 28 April 2016.
  4. "PSLV-C33 - IRNSS-1G Specifications" (PDF). ISRO. Retrieved 28 April 2016.
  5. "'Isro launches rocket carrying India's seventh navigation satellite'". Business Standard. 28 April 2016. Retrieved 28 April 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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