UPSC Exam Preparation: Topic of the Day – IRNSS-1I
- There are currently seven Indian Regional Navigation Satellite System (IRNSS) satellites (1A to 1G) in orbit.
- A, B, F, G are placed in a geosynchronous orbit, which means they seem to be at a fixed location above the Earth and they orbit along with the Earth.
- The remaining three C, D, E, are located in geostationary orbit-they seem to be at a fixed location above the Earth along the equator and orbit along with the Earth.
- The launch of IRNSS-1I will be the ninth navigational satellite launch under the project which has seen seven successful launches and one unsuccessful launch.
- ISRO is attempting to launch one of the backup satellites to replace NavIC navigation satellite constellation’s IRNSS-1A whose three rubidium clocks failed
- PSLV in 43rd flight will lift off IRNSS-1I which weighs 1425 kg. It will replace IRNSS-1A and join the constellation of seven satellites.
- It will have L5 and S-band navigation payload with rubidium atomic clocks.
- It will be placed in a sub-geosynchronous transfer orbit and at its closest point will be 284 km above the Earth and at its farthest will be 20,650 km above the Earth.
- Like all other IRNSS satellites, IRNSS-1I will also carry two payloads – navigation payload and ranging payload –
- the former to transmit signals for determining position, velocity and time and
- The latter for determining the frequency range of the satellite.
Previous attempts at replacement
- It is ISRO’S second attempt at launching a replacement satellite.
- The past mission in August 2017 where a PSLV carried IRNSS-1H failed after the heat shield covering the satellite failed to separate.
- Except for IRNSS-1H, all the launches have been successful.
- IRNSS will assist in terrestrial, aerial and marine navigation, disaster management, vehicle tracking and fleet management, integration with mobile phones, precise timing, mapping and geodetic data capture, a terrestrial navigation aid for hikers and travellers, visual and voice navigation for drivers and riders
- Navigation satellite signal receivers which will give positioning and weather alerts to fishermen in deep sea and more such devices will be fitted in boats in Tamil Nadu and Kerala
- This will help in sending alerts to fishermen vital information at times of cyclones
- There are three components in the satellites’ receiver – a Bluetooth module, a microcontroller and a chipset. The receiver, developed by ISRO’s Space Applications Centre, Ahmedabad, is also being improved to save power in both mobile and the device.
Read more ‘Topic of the Day’ and stay ahead of your competition.