IRNSS-1I

IRNSS-1I

IRNSS series one spacecraft
Mission type	Navigation
Operator	ISRO
COSPAR ID	2018-035A [1]
SATCAT no.	43286 [2]
Mission duration	Planned: 10 years Elapsed: 7 years, 9 months, 11 days
Spacecraft properties
Manufacturer	ISRO Satellite Centre Space Applications Centre
Launch mass	1,425 kilograms (3,142 lb)
Dry mass	600 kilograms (1,300 lb)
Start of mission
Launch date	11 April 2018, 22:34 UTC [3]
Rocket	PSLV-XL PSLV-C41 [4]
Launch site	Satish Dhawan SLP
Contractor	ISRO
Orbital parameters
Reference system	Geocentric
Regime	Geosynchronous
Longitude	55° E
Inclination	29°
Period	1450.9 minutes [5]
NavIC ←  IRNSS-1H NVS-01  →

IRNSS-1I is an Indian navigational satellite that forms part of the Indian Regional Navigational Satellite System. IRNSS-1I is the ninth satellite launched for the IRNSS constellation and one of five IRNSS satellites currently operational. ^[6] 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 URSC's supervision. ^[7]

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 L5 band and S band. A highly accurate rubidium atomic clock is part of the navigation payload of the satellite; failure of these rubidium atomic clocks was the reason IRNSS-1A was deemed unfit. ^[8] 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 IRNSS space segment consists of seven satellites. After the failure of all three rubidium Atomic clocks 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.

Launch

IRNSS-1I was successfully launched aboard the 43rd flight of PSLV (PSLV-C41) on 11 April 2018. ^{[9] [10]}

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

• Spaceflight portal
• India portal

• Communication-Centric Intelligence Satellite (CCI-Sat)
• GPS-aided geo-augmented navigation (GAGAN)
• Satellite navigation

References

1. "IRNSS 1I Satellite details". n2yo. Retrieved 14 April 2018.
2. "IRNSS 1I". karhukoti. Retrieved 19 April 2018.
3. "Launch date". Spaceflight101. 27 March 2018. Archived from the original on 27 March 2018. Retrieved 27 March 2018.
4. "Official page". Economic Times. 11 March 2018. Archived from the original on 17 March 2018. Retrieved 16 March 2018.
5. "IRNSS 1I". karhukoti. Retrieved 19 April 2018.
6. "ISRO's new NavIC satellite launches successfully: Why a regional navigation system matters to India". The Indian Express. 2023-05-29. Retrieved 2024-01-04.
7. "Industry partnership with Alpha Design Technologies". The Hindu. 14 August 2017.
8. "ISAC's website for IRNSS". ISAC. 31 August 2017.
9. "IRNSS-1I up in space, completes first phase of Indian regional navigation constellation". The Hindu . 12 April 2018.
10. "Isro successfully launches navigation satellite IRNSS-1I to replace faulty IRNSS-1A". The Times of India . 12 April 2018.

External links

• ISRO Future Programmes