IRNSS-1D
Indian Earth observation satellite, 2015–2025
From Wikipedia, the free encyclopedia
IRNSS-1D was a satellite in the Indian Regional Navigational Satellite System (IRNSS) constellation. The satellite is the fourth of seven in the constellation, launched after IRNSS-1A, IRNSS-1B and IRNSS-1C. The satellite is the only satellite in the constellation slated to provide navigational services to the region. The satellite was placed in geosynchronous orbit.[4] It was launched successfully on 28 March 2015 onboard ISRO's PSLV-C27 from Satish Dhawan Space Centre, Sriharikota.[5][6][7]
| |
| Mission type | Navigation |
|---|---|
| Operator | ISRO |
| COSPAR ID | 2015-018A |
| SATCAT no. | 40547 |
| Website | http://www.isro.gov.in/Spacecraft/irnss-1d |
| Mission duration | Planned: 12 years Elapsed: 10 years, 9 months, 3 days |
| Spacecraft properties | |
| Spacecraft | IRNSS-1D |
| 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 | 1,660 W |
| Start of mission | |
| Launch date | 11:49, March 28, 2015 (UTC)[1] |
| Rocket | PSLV-XL C27[2] |
| Launch site | Satish Dhawan SLP[1] |
| Contractor | ISRO |
| End of mission | |
| Deactivated | 2025 |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Geosynchronous |
| Longitude | 111.75° East |
| Perigee altitude | 35,750.0 km (22,214.0 mi)[3] |
| Apogee altitude | 35,884.1 km (22,297.3 mi)[3] |
| Inclination | 30.43 degrees[3] |
| Period | 1436.1 minutes[3] |
| Epoch | 5 May 2015, 20:43:00 UTC[3] |
Satellite
The satellite will help in augmenting the satellite based navigation system of India which is currently under development. The navigational system so developed will be a regional one targeted towards South Asia. The satellite will provide navigation, tracking and mapping services.[8]
IRNSS-1D satellite has two payloads: a navigation payload and CDMA ranging payload in addition with a laser retro-reflector. The payload generates navigation signals at L5 and S-band. The design of the payload makes the IRNSS system inter-operable and compatible with Global Positioning System (GPS) and Galileo.[4] The satellite is powered by two solar arrays, which generate power up to 1,660 watts, and has a life-time of ten years.
Cost
The total cost of the mission was estimated at ₹14 billion.[9]
Retirement
At its end-of-mission, the IRNSS-1D satellite was raised to a graveyard orbit nearly 600 kilometres (370 mi) above the geostationary belt and passivated. Unlike other ISRO geostationary satellites who were disposed of in super-synchronous orbits, IRNSS-1D was the first to be disposed of in an inclined geosychronosis orbit.[10]
