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'''GISIS''' was the seventh and final<ref name="Launch" /> 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 [[Indian Standard Time|IST]].<ref name="Launch" />
'''IRNSS-1G''' was the seventh and final<ref name="Launch" /> 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 launched successfully on 28 April 2016 at 07:20 UTC.<ref name="Launch" />
 
IRNSS-1G along IRNSS-1A is being used only for NavIC's short message broadcast service and not for navigation.<ref name=":11">{{cite web|title=Annual Report 2019-20|url=https://www.isro.gov.in/sites/default/files/flipping_book/annual_report_2019-20_english/index.html#50|access-date=5 March 2020|publisher=Department of Space}}</ref><ref name="ar-2021">{{cite web|title=ANNUAL REPORT 2020-2021|url=https://www.isro.gov.in/sites/default/files/anual_report_2020-2021_english.pdf|access-date=6 March 2021|publisher=ISRO}}</ref>


== Launch ==
== Launch ==
The satellite was launched from the [[Satish Dhawan Space Centre First Launch Pad|First Launch Pad (FLP)]] of [[Satish Dhawan Space Centre]], [[Sriharikota]] on board [[Polar Satellite Launch Vehicle|PSLV-C33]].<ref name="Launch">{{Cite news|url =http://www.thehindu.com/sci-tech/science/irnss-launch-indias-own-regional-navigation-satellite-system-takes-shape/article8531388.ece|title = India launches seventh navigation satellite, to get its own GPS |date = April 28, 2016|work = The Hindu|access-date = April 28, 2016}}</ref> The countdown of the launch had begun 51:30 hours before at 9:20&nbsp;a.m. IST on 25 April.<ref name="countdown" />
The satellite was launched from the [[Satish Dhawan Space Centre First Launch Pad|First Launch Pad (FLP)]] of [[Satish Dhawan Space Centre]], [[Sriharikota]] on board [[Polar Satellite Launch Vehicle|PSLV-C33]] XL on 28 April 2016 at 12:50 PM [[Indian Standard Time|IST]].<ref name="Launch">{{Cite news|url =http://www.thehindu.com/sci-tech/science/irnss-launch-indias-own-regional-navigation-satellite-system-takes-shape/article8531388.ece|title = India launches seventh navigation satellite, to get its own GPS |date = April 28, 2016|work = The Hindu|access-date = April 28, 2016}}</ref><ref>{{cite web|title=PSLV-C33/IRNSS-1G|url=http://www.isro.gov.in/launcher/pslv-c33-irnss-1g|access-date=28 April 2016|publisher=ISRO}}</ref> The countdown of the launch had begun 51:30 hours before at 9:20&nbsp;AM IST on 25 April 2016.<ref name="countdown" />


After the launch of IRNSS-1G the Indian government named the IRNSS system as NAVIC (Navigation Indian Constellation).
After the launch of IRNSS-1G the Indian government named the IRNSS system as NAVIC ('''Nav'''igation with '''I'''ndian '''C'''onstellation).<ref>{{Cite web|title=PSLV-C33 Successfully Launches India's Seventh Navigation Satellite IRNSS-1G - ISRO|url=https://www.isro.gov.in/update/28-apr-2016/pslv-c33-successfully-launches-indias-seventh-navigation-satellite-irnss-1g|access-date=2021-11-01|website=www.isro.gov.in}}</ref>


== Specifications ==
== Specifications ==
The satellite is designed for 12 years of life.<ref name="countdown">{{cite web | url=http://www.thehindubusinessline.com/news/science/countdown-for-irnss1g-launch-begins-at-sriharikota/article8523638.ece | title=Countdown for IRNSS-1G launch begins at Sriharikota | work=[[The Hindu]] | date=26 April 2016 | access-date=28 April 2016 | author=PTI}}</ref> It has a lift-off mass of {{Convert|1425|kg}} and dry mass of {{Convert|598|kg}}.<ref name=
'''Mission life:''' 12 years (planned).<ref name="countdown">{{cite web | url=http://www.thehindubusinessline.com/news/science/countdown-for-irnss1g-launch-begins-at-sriharikota/article8523638.ece | title=Countdown for IRNSS-1G launch begins at Sriharikota | work=[[The Hindu]] | date=26 April 2016 | access-date=28 April 2016 | author=PTI}}</ref>  
"Spec">{{cite web | url=http://www.isro.gov.in/sites/default/files/pslv-c33_brochure.pdf | title=PSLV-C33 - IRNSS-1G Specifications | publisher=ISRO | access-date=28 April 2016}}</ref> 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.<ref>{{Cite news|url =http://www.business-standard.com/article/current-affairs/isro-launches-rocket-carrying-india-s-seventh-navigation-satellite-116042800308_1.html|title = 'Isro launches rocket carrying India's seventh navigation satellite'|date = April 28, 2016|work = Business Standard|access-date = April 28, 2016}}</ref> It would operate in [[L band|L-5]] and [[S band]] spectrums and also has a [[Rubidium atomic clock]].<ref>{{cite web | url=http://www.isro.gov.in/Spacecraft/irnss-1g | title=IRNSS-1G | work=ISRO | access-date=28 April 2016}}</ref> 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.<ref name="Spec"/> The satellite is placed in an orbit at an altitude of {{convert|35788.5|km}} at 129.5 deg East longitude.<ref name="Spec"/><ref>{{cite web | url=http://indiatoday.intoday.in/story/indias-own-navigation-satellite-irnss-1g-launched-all-you-need-to-know-about-it/1/653698.html | title=India's own navigation satellite IRNSS-1G launched: All you need to know about it | work=[[India Today]] | date=28 April 2016 | access-date=28 April 2016 | author=Sangeeta Ojha}}</ref> It cost approximately {{INRConvert|125|c}}.<ref name="Desi">{{cite web | url=http://economictimes.indiatimes.com/news/science/irnss-desi-gps-to-liberate-india-from-dependence-on-us-russia/articleshow/52058262.cms | title=IRNSS: Desi GPS to liberate India from dependence on US, Russia | work=Economic Times | date=1 May 2016 | access-date=2 May 2016 | author=Vanita Srivastava}}</ref>
 
'''Lift-off mass:'''{{Convert|1425|kg}}  
 
'''Dry mass:''' {{Convert|598|kg}}.<ref name="Spec">{{cite web | url=http://www.isro.gov.in/sites/default/files/pslv-c33_brochure.pdf | title=PSLV-C33 - IRNSS-1G Specifications | publisher=ISRO | access-date=28 April 2016}}</ref>
 
'''Payload:''' [[Code-division multiple access|CDMA]] ranging payload in [[C band (IEEE)|C band]].<ref>{{Cite news|url =http://www.business-standard.com/article/current-affairs/isro-launches-rocket-carrying-india-s-seventh-navigation-satellite-116042800308_1.html|title = 'Isro launches rocket carrying India's seventh navigation satellite'|date = April 28, 2016|work = Business Standard|access-date = April 28, 2016}}</ref><ref name=":0">{{Cite web|title=SALIENT FEATURES OF IRNSS 1G|url=https://www.ursc.gov.in/navigation/html/irnss-1g.jsp|access-date=2021-11-01|website=www.ursc.gov.in}}</ref> Navigation payload in [[L band|L-5]] and [[S band]] spectrums and [[Rubidium atomic clock|Rubidium atomic clocks]].<ref>{{cite web | url=http://www.isro.gov.in/Spacecraft/irnss-1g | title=IRNSS-1G | work=ISRO | access-date=28 April 2016}}</ref>  
 
'''Power:''' Two [[Multi-junction solar cell|triple-junction solar panels]] to generate 1660W of energy and one Lithium-ion 90A-hr battery is used.<ref name="Spec" />
 
'''Propulsion:''' [[Monomethylhydrazine|MMH]]/[[Mixed oxides of nitrogen|MON3]] based bipropellant system with 12×22N [[Attitude control]] thrusters and one 440N [[Liquid apogee engine|LAM]].<ref name=":0" />
 
'''Orbit:''' [[Geosynchronous orbit]] at 129.5° East longitude with 5° inclination.<ref name="Spec" /><ref>{{cite web | url=http://indiatoday.intoday.in/story/indias-own-navigation-satellite-irnss-1g-launched-all-you-need-to-know-about-it/1/653698.html | title=India's own navigation satellite IRNSS-1G launched: All you need to know about it | work=[[India Today]] | date=28 April 2016 | access-date=28 April 2016 | author=Sangeeta Ojha}}</ref>  


The "XL" version of PSLV was used with six strap-ons for the launch. Each strap-on used {{convert|12|MT}} of propellant. ISRO has successfully used PSLV 34 times and the XL version 12 times before the launch of IRNSS-1G.<ref>{{cite web | url=http://www.isro.gov.in/launcher/pslv-c33-irnss-1g | title=PSLV-C33/IRNSS-1G | publisher=ISRO | access-date=28 April 2016}}</ref>
'''Cost:''' Approximately {{INRConvert|125|c}}.<ref name="Desi">{{cite web | url=http://economictimes.indiatimes.com/news/science/irnss-desi-gps-to-liberate-india-from-dependence-on-us-russia/articleshow/52058262.cms | title=IRNSS: Desi GPS to liberate India from dependence on US, Russia | work=Economic Times | date=1 May 2016 | access-date=2 May 2016 | author=Vanita Srivastava}}</ref>


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| image5 = Animation of IRNSS orbit - Earth fixed - polar view.gif
| image5 = Animation of IRNSS orbit - Earth fixed - polar view.gif
| caption5 = [[ECEF|Earth fixed frame]] - Polar view
| caption5 = [[ECEF|Earth fixed frame]] - Polar view
| footer = {{legend2| RoyalBlue | Earth}}{{·}}{{legend2| magenta |[[IRNSS-1B]] }}{{·}}{{legend2| lime |[[IRNSS-1C]] }}{{·}}{{legend2| Cyan |[[IRNSS-1E]] }}{{·}}{{legend2|Gold|[[IRNSS-1F]] }}{{·}}{{legend2| OrangeRed|[[IRNSS-1G]] }}{{·}}{{legend2| Red|[[IRNSS-1I]]}}
| footer = {{legend2| RoyalBlue | Earth}}{{·}}{{legend2| magenta |[[IRNSS-1B]] }}{{·}}{{legend2| lime |[[IRNSS-1C]] }}{{·}}{{legend2| Cyan |[[IRNSS-1E]] }}{{·}}{{legend2|Gold|[[IRNSS-1F]] }}{{·}}{{legend2| OrangeRed|IRNSS-1G }}{{·}}{{legend2| Red|[[IRNSS-1I]]}}
}}
}}
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