IRNSS
Jump to: Mission Objectives, Mission Instrumentation, Mission Parameters, Additional Information
Mission Photos:
Courtesy of ISRO
Mission Objectives:
The Indian Regional Navigation Satellite System (IRNSS) consists of a constellation of seven satellites and a ground segment for positioning and timing applications. IRNSS is under development by the Indian Space Research Organisation (ISRO). INRSS will include three satellites in geostationary orbit and four satellites in geosynchronous orbit, transmitting L-band and S-band signals and providing coverage primarily for the Indian land mass.
SLR tracking data will be used for orbit determination and calibration of the orbit determined from other sources.
Notes:
- IRNSS-1H had a launch failure on August 31, 2017.
- IRNSS-1G does not have a retroreflector array.
Mission Instrumentation:
IRNSS satellites will have the following instrumentation onboard:
- Atomic clocks
- L and S-band transmitters
- Retroreflector array
Mission Parameters:
| Satellite: | IRNSS-1A | IRNSS-1B | IRNSS-1C | IRNSS-1D |
| Sponsor: | ISRO | ISRO | ISRO | ISRO |
| Expected Life: | 10 years | 12 years | 12 years | 12 years |
| Primary Applications: | Positioning and timing | Positioning and timing | Positioning and timing | Positioning and timing |
| Primary SLR Applications: | Orbit determination | Orbit determination | Orbit determination | Orbit determination |
| COSPAR ID: | 1303401 | 1401701 | 1406101 | 1501801 |
| SIC Code: | 3301 | 3302 | 3303 | 3304 |
| NORAD SSC Code: | 39199 | 39635 | 40269 | 40547 |
| Launch Date: | July 1, 2013 | April 4, 2014 | October 15, 2014 | March 27, 2015 |
| NP Bin Size: | 300 seconds | 300 seconds | 300 seconds | 300 seconds |
| RRA Shape: | Hexagon | Hexagon | Hexagon | Hexagon |
| Cube Diameter: | 38 mm | 38 mm | 38 mm | 38 mm |
| Reflectors: | 40 corner cubes | 40 corner cubes | 40 corner cubes | 40 corner cubes |
| Inclination: | 29.3 degrees | 30.57 degrees | 4.78 degrees | 30.43 degrees |
| Longitude: | 55.0 degrees East | 55.0 degrees East | 83.0 degrees East | 111.75 degrees East |
| Eccentricity: | 0.0002 | 0.0002 | 0.0002 | 0.0002 |
| Apogee: | 35,882.7 km | 35,870 km | 35,889 km | 35,884.1 km |
| Perigee: | 35,706.1 km | 35,714 km | 35,697 km | 35,750 km |
| Satellite: | IRNSS-1E | IRNSS-1F | IRNSS-1G | IRNSS-1H |
| Sponsor: | ISRO | ISRO | ISRO | ISRO |
| Expected Life: | 12 years | 12 years | 12 years | 12 years |
| Primary Applications: | Positioning and timing | Positioning and timing | Positioning and timing | Positioning and timing |
| Primary SLR Applications: | Orbit determination | Orbit determination | Orbit determination | Orbit determination |
| COSPAR ID: | 1600301 | 1601501 | 1602701 | 1705101 |
| SIC Code: | 3305 | 3306 | 3307 | 3308 |
| NORAD SSC Code: | 41241 | 41384 | 41469 | 42928 |
| Launch Date: | January 20, 2016 | March 10, 2016 | April 28, 2016 | August 31, 2017 |
| NP Bin Size: | 300 seconds | 300 seconds | N/A | |
| RRA Shape: | Hexagon | Hexagon | N/A | Hexagon |
| Cube Diameter: | 38 mm | 38 mm | N/A | 38 mm |
| Reflectors: | 40 corner cubes | 40 corner cubes | N/A | 40 corner cubes |
| Inclination: | 28.09 degrees | 32.5 degrees | 4.2537 degrees | |
| Longitude: | 111.75 degrees East | 32.5 degrees East | 129.5 degrees East | Launch Failure |
| Eccentricity: | 0.0002 | 0.0002 | ||
| Apogee: | 35,882.8 km | 35,876 km | 35,796.20 km | |
| Perigee: | 35,706.5 km | 35,711.5 km | 35,780.96 km |
| Satellite: | IRNSS-1I |
| Sponsor: | ISRO |
| Expected Life: | 12 years |
| Primary Applications: | Positioning and timing |
| Primary SLR Applications: | Orbit determination |
| COSPAR ID: | 1803501 |
| SIC Code: | 3309 |
| NORAD SSC Code: | 43286 |
| Launch Date: | April 11, 2018 |
| NP Bin Size: | 300 seconds |
| RRA Shape: | Hexagon |
| Cube Diameter: | 38 mm |
| Reflectors: | 40 corner cubes |
| Inclination: | 28.8 degrees |
| Longitude: | 55.0 degrees East |
| Eccentricity: | 0.0002 |
| Apogee: | 35,873.8 km |
| Perigee: | 35,713.9 km |
Additional Information:
Publications:
- O. Montenbruck, P. Steigenberger, S. Riley. "IRNSS Orbit Determination and Broadcast Ephemeris Assessment." (c) Institute of Navigation. Presented at ION ITM 2015, Dana Point, CA, 26-28 Jan 2015.
Websites:
- IRNSS home page (ISRO)
- IRNSS Navipedia information
