Science & Technology
- ISRO launches spy satellite RISAT-2BR1
Key Facts for Prelims
- International Seminar cum Exhibition on Naval weapon Systems – NAVARMS-19
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Science & Technology
ISRO launches spy satellite RISAT-2BR1
India launched its latest spy satellite, RISAT-2BR1, and nine foreign satellites through the Polar Satellite Launch Vehicle (PSLV), which is on its 50th mission.
- The other nine customer satellites of Israel, Italy, Japan and USA were launched under a commercial arrangement with New Space India Limited (NSIL).
- RISAT-2BR1 is a radar imaging earth observation satellite developed by ISRO.
- Apart from being used for military purposes, it has applications in fields such as agriculture and disaster management support.
- It has a mission life of five years.
- New Space India Limited (NSIL), a wholly owned Government of India undertaking/ Central Public Sector Enterprise (CPSE), was launched in March 2019 under the Department of Space (DOS).
- It aims to commercially exploit the research and development work of Indian Space Research Organisation (ISRO) Centres and constituent units of DOS.
- Polar Satellite Launch Vehicle was developed to launch Low Earth Orbit satellites into Polar and Sun Synchronous Orbit
Launchers of ISRO
- Satellite Launch Vehicle (SLV)
- Augmented Satellite Launch Vehicle (ASLV)
- Polar Satellite Launch Vehicle (PSLV)
- Geosynchronous Satellite Launch Vehicle (GSLV)
- GSLV Mk III
- Sounding Rockets
- RLV-TD (Reusable Launch Vehicle – Technology Demonstrator)
- Scramjet Engine – TD
DIFFERENCE BETWEEN PSLV AND GSLV:
- India has two operational launchers- Polar Satellite Launch Vehicle (PSLV) and Geosynchronous Satellite Launch Vehicle (GSLV).
- GSLV was developed to launch the heavier INSAT class of geosynchronous satellites into orbit.
CLASSES OF ORBIT
- A geostationary orbit, often referred to as a GEO orbit, circles the Earth above the equator from west to east at a height of 36 000 km. As it follows the Earth’s rotation, GEO orbit appear to be ‘stationary’ over a fixed position.
- It is ideal orbit for telecommunications or for monitoring continent-wide weather patterns and environmental conditions.
Low Earth orbits
- A low Earth orbit is normally at an altitude of less than 1000 km and could be as low as 160 km above the Earth.
- These orbits are used for remote sensing, military purposes and for human spaceflight as they offer close proximity to the Earth’s surface for imaging and the short orbital periods allow for rapid revisits. The International Space Station is in low Earth orbit.
Medium low Earth orbit
- This orbit takes place at an altitude of around 1000 km and is particularly suited for constellations of satellites mainly used for telecommunications.
- Polar orbits pass over the Earth’s polar regions from north to south. The orbital track of the satellite does not have to cross the poles exactly for an orbit to be called polar.
- These orbits mainly take place at low altitudes of between 200 to 1000 km. Polar orbits are used for reconnaissance and Earth observation.
Sun synchronous orbits
- These are polar orbits which are synchronous with the Sun. A satellite in a sun synchronous orbit would usually be at an altitude of between 600 to 800 km.
- Generally these orbits are used for Earth observation, solar study, weather forecasting and reconnaissance, as ground observation is improved if the surface is always illuminated by the Sun at the same angle when viewed from the satellite.
Key Facts for Prelims
International Seminar cum Exhibition on Naval weapon Systems – NAVARMS-19
4th edition of International Seminar cum Exhibition on Naval Weapon Systems ‘NAVARMS-19’ with the theme “Make in India – Fight Category: Opportunities and Imperatives” was recently held at New Delhi.
- It was organized by the Directorate General of Naval Armament Inspection, Indian Navy in association with the Society of Indian Defence Manufacturers (SIDM) & Confederation of Indian Industry (CII).
- NAVARMS is the only international seminar and exhibition on Naval Weapon Systems conducted in India which invite all the stakeholders in life cycle management of Naval Weapons.
- In past, it was organized three times in 2007,2010 and 2013.
SOCIETY OF INDIAN DEFENCE MANUFACTURERS
- The Society of Indian Defence Manufacturers (SIDM) is a not-for-profit association formed to be the apex body of the Indian defence industry.