Ajay Kumar at 07:50, 2 September 2023

2023-09-02T07:50:11Z

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{{Infobox spaceflight|auto=all
| name = IRNSS-1I
| image = File:IRNSS_Series_1.jpg
| image_caption = IRNSS series one spacecraft

| mission_type = [[Satellite navigation|Navigation]]
| operator = [[ISRO]]
| website =
| COSPAR_ID = 2018-035A<ref>{{cite web|url=https://www.n2yo.com/satellite/?s=43286|title=IRNSS 1I Satellite details|publisher=n2yo|access-date=14 April 2018}}</ref>
| SATCAT = 43286<ref>{{cite web|url=https://www.karhukoti.com/webtracker?s=43286|title=IRNSS 1I|publisher=karhukoti|access-date=19 April 2018}}</ref>
| mission_duration = 10 years

| spacecraft_bus =
| manufacturer = [[Indian Space Research Organisation Satellite Centre|ISRO Satellite Centre]]<br/>[[Space Applications Centre]]
| dry_mass = {{convert|600|kg|lb}}
| launch_mass = {{convert|1425|kg|lb}}
| power =

| launch_date = 11 April 2018, 22:34 [[UTC]]<ref name="date">{{cite web|title=Launch date|url=https://spaceflight101.com/events/pslv-c41-irnss-1i/|publisher=Spaceflight101|date=27 March 2018}}</ref>
| launch_rocket = [[Polar Satellite Launch Vehicle|PSLV-XL]] C41 <ref name="pslvc41">{{cite web|title=Official page|url=https://www.isro.gov.in/pslv-c41-irnss-1i-mission|publisher=Economic Times|date=11 March 2018|access-date=16 March 2018|archive-url=https://web.archive.org/web/20180317035846/https://www.isro.gov.in/pslv-c41-irnss-1i-mission|archive-date=17 March 2018|url-status=dead}}</ref>
| launch_site = [[Satish Dhawan Space Centre|Satish Dhawan]] [[Satish Dhawan Space Centre Second Launch Pad|SLP]]
| launch_contractor = [[Indian Space Research Organisation|ISRO]]

| disposal_type =
| deactivated =
| last_contact =
| decay_date =

| orbit_epoch =
| orbit_reference = [[geocentric orbit|Geocentric]]
| orbit_regime = [[Geosynchronous orbit|Geosynchronous]]
| orbit_periapsis =
| orbit_apoapsis =
| orbit_inclination = 29°
| orbit_period = 1450.9 minutes<ref>{{cite web|url=https://www.karhukoti.com/webtracker?s=43286|title=IRNSS 1I|publisher=karhukoti|access-date=19 April 2018}}</ref>
| orbit_longitude = 55° E
| apsis = gee
| programme = [[NavIC]]
| previous_mission = [[IRNSS-1H]]
| next_mission = [[NVS-01]]
}}

'''IRNSS-1I''' is the eighth satellite in the [[Indian Regional Navigational Satellite System]] (IRNSS) series of satellites, in reality, IRNSS - 1I is the ninth satellite that launched in IRNSS constellation but it is counting as eighth satellite because IRNSS - 1I is an eighth satellite that has launched successfully in IRNSS constellation.<ref name="EDUCATIONALTECHS">{{cite web|url=https://www.educationaltechs.com/2018/04/isro-successfully-launched-irnss-1i.html| title= ISRO Successfully Launched IRNSS - 1I Navigation Satellite By PSLV - C41 | publisher= EDUCATIONALTECHS , edited by -Vikash Kushwaha |access-date=17 April 2018}}</ref> ISRO already launched [[IRNSS-1A]], [[IRNSS-1B]], [[IRNSS-1C]], [[IRNSS-1D]], [[IRNSS-1E]], [[IRNSS-1F]], [[IRNSS-1G]] and [[IRNSS-1H]]. The satellite is intended to replace the failed IRNSS-1A, and complete the constellation of geosynchronous navigation satellites after [[IRNSS-1H]] failed to do so. The satellite's assembly, integration and testing is partly done by a consortium of six small firms led by Alpha Design Technologies, a Bengaluru-based aerospace firm under [[U R Rao Satellite Centre|URSC]]'s supervision.<ref name="alpha">{{cite web|title=Industry partnership with Alpha Design Technologies|url=http://www.thehindu.com/todays-paper/tp-national/tp-andhrapradesh/satellite-built-by-isro-industry-partnership-set-for-launch/article19488075.ece|work=The Hindu|date=14 August 2017}}</ref>

==Payload==
Like its predecessor, IRNSS-1I has two types of payloads, navigation payload and the ranging payload. The navigation payload transmits navigation service signals to the users. This payload is operating in [[L band|L5 band]] and [[S band]]. A highly accurate Rubidium atomic clock is part of the navigation payload of the satellite.<ref name="payload">{{cite web|title=ISAC's website for IRNSS |url=https://www.isac.gov.in/navigation/irnss.jsp|publisher=ISAC|date=31 August 2017}}</ref> Failure of these Rubidium atomic clocks was the reason for [[IRNSS-1A]] to be deemed unfit. The ranging payload consists of transponder which is operated in CDMA mode for two-way range measurements. The IRNSS satellites continuously emits time stamped navigation signals, which are received by the ground-based user receivers. The information is then processed by the receivers to derive their own position, velocity and time. The system provides seamless, uninterrupted services under all weather conditions.

==Satellite==
The satellite will help in completing the satellite based navigation system of India which is currently under development. The [[Indian Regional Navigational Satellite System|IRNSS]] space segment consists of seven satellites. After the failure of all three Rubidium [[Atomic clock]]s on-board [[IRNSS-1A]] and the failure of [[IRNSS-1H]] to separate from the heat shield of the launch vehicle, IRNSS constellation remains incomplete without this satellite. <br/> This independent regional navigation satellite system is developed by India and is similar to Global Positioning System (GPS) of the US, which has 31 satellites currently in orbit.

==Launch==
IRNSS-1I was successfully launched by 43rd flight of [[PSLV]] (PSLV-C41) in XL configuration on 11 April 2018.<ref>{{cite news|url=https://www.thehindu.com/sci-tech/science/irnss-1i-up-in-orbit-completes-navigation-fleet/article23508603.ece|title=IRNSS-1I up in space, completes first phase of Indian regional navigation constellation|website=[[The Hindu]] |date=12 April 2018 }}</ref><ref>{{cite news|url=https://timesofindia.indiatimes.com/india/isro-successfully-launches-navigation-satellite-irnss-1i-to-replace-faulty-irnss-1a/articleshow/63723847.cms|title=Isro successfully launches navigation satellite IRNSS-1I to replace faulty IRNSS-1A|website=[[The Times of India]] |date=12 April 2018 }}</ref>

{{multiple image
| align = left
| direction = horizontal
| width = 200
| header = Animation of IRNSS
| image1 = Animation of IRNSS orbit around Earth.gif
| caption1 = Around the Earth
| image2 = Animation of IRNSS orbit around Earth - Polar view.gif
| caption2 = Around the Earth - Polar view
| image3 = Animation of IRNSS orbit - Earth fixed - front view.gif
| caption3 = [[ECEF|Earth fixed frame]] - Equatorial view, front
| image4 = Animation of IRNSS orbit - Earth fixed - side view.gif
| caption4 = [[ECEF|Earth fixed frame]] - Equatorial view, side
| image5 = Animation of IRNSS orbit - Earth fixed - polar view.gif
| 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}}
}}
{{clear}}

==See also==
{{Portal|Spaceflight|India}}
* [[Communication-Centric Intelligence Satellite|Communication-Centric Intelligence Satellite (CCI-Sat)]]
* [[GPS-aided geo-augmented navigation|GPS-aided geo-augmented navigation (GAGAN)]]
* [[Satellite navigation]]

== References ==
{{Reflist|2}}

== External links ==
* [http://www.isro.org/scripts/futureprogramme.aspx ISRO Future Programmes]

{{IRNSS satellites}}
{{Orbital launches in 2018}}
{{PSLV}}

[[Category:IRNSS satellites]]
[[Category:Spacecraft launched by India in 2018]]
[[Category:Spacecraft launched by PSLV rockets]]
[[Category:April 2018 events in India]]

IRNSS-1I - Revision history

Ajay Kumar at 07:50, 2 September 2023