ISRO is the space agency under the Department of Space of Government of India, headquartered in the city of Bengaluru, Karnataka.
Its vision is to harness space technology for national development, while pursuing space science research and planetary exploration.
Antrix Corporation Limited (ACL) is a Marketing arm of ISRO for promotion and commercial exploitation of space products, technical consultancy services and transfer of technologies developed by ISRO.
Kailasavadivoo SivanKailasavadivoo Sivan.
The Chairman of the Indian Space Research Organisation is the highest-ranked official of the Indian Space Research Organisation (ISRO). He is secretaryto government of India and executive of Department of Space (DOS) which directly reports to the prime minister of India.
Genesis
The space research activities were initiated in India under Dr. Vikram Sarabhai, the founding father of Indian space programme, during 1960’s.
Since inception, the Indian space programme had three distinct elements such as, satellites for communication and remote sensing, the space transportation system and application programmes.
The INCOSPAR (Indian National Committee for Space Research) was initiated under the leadership of Dr. Sarabhai and Dr. Ramanathan.
During 1975-76, Satellite Instructional Television Experiment (SITE) was conducted. It was hailed as ‘the largest sociological experiment in the world’. It was followed by the ‘Kheda Communications Project (KCP)’, which worked as a field laboratory for need-based and locale specific programme transmission in state of Gujarat State.
During this period, the first Indian spacecraft ‘Aryabhata’ was developed and was launched using a Soviet Launcher. Another major landmark was the development of the first launch vehicle SLV-3 with a capability to place 40 kg in Low Earth Orbit (LEO), which had its first successful flight in 1980.
In the experimental phase during 80’s, Bhaskara-I & II missions were pioneering steps in the remote sensing area whereas ‘Ariane Passenger Payload Experiment (APPLE)’ became the forerunner for future communication satellite system.
During the operational phase in 90’s, major space infrastructure was created under two broad classes: one for the communication, broadcasting and meteorology through a multi-purpose Indian National Satellite system (INSAT), and the other for Indian Remote Sensing Satellite (IRS) system. The development and operationalisation of Polar Satellite Launch Vehicle (PSLV) and development of Geosynchronous Satellite Launch Vehicle (GSLV) were significant achievements during this phase.
Achievements
Communication Satellites
Established in 1983 with commissioning of INSAT-1B, the Indian National Satellite (INSAT) system is one of the largest domestic communication satellite systems in Asia-Pacific region with nine operational communication satellites placed in Geostationary orbit.
It initiated a major revolution in India’s communications sector and sustained the same later. The INSAT system provides services to telecommunications, television broadcasting, satellite newsgathering, societal applications, weather forecasting, disaster warning and Search and Rescue operations.
ISRO launched two major satellite systems namely
Indian National Satellites (INSAT): for communication services(GSLV)
Indian Remote Sensing(IRS): management of natural resources (PSLV)
It was developed to enable india to launch its INSAT
type of satellites in to geostationery orbit and india to less depedent on foreign countries (USA& Europe) rockets.
Which was designed to carry 2500kg into geosynchronous orbit 37,000km above the earth.
3 stage rocket
out of 3
1st-solid
2nd- liquid
3rd-cryogenicstage
I
it is ISRO heaviest launch vehicle capable of putting payload of 5 tons into low earth orbit.
Cryogenic Engine
It is an type of liquid fuelled engine using liquid oxygen and liquid hydrogen as propellant.(-200 degree celsius)
It has higher impulse than ordinary solid and liquid engine.
it provide better thrust for every kg,
efficiency, reliability, and cost effectiveness.
Orbit types
1.Geocentric orbit:
Low earth orbit: orbit below 2000km
Medium earth orbit: between 2000km- 35,786km
High earth orbit: orbit higher than 35,786km
2. Geosynchronous orbit:
circular orbits around the earth having a period of 24 hrs
Geosynchronous with zero degree inclination –geostationery orbit & it lies above the equator.
Geosynchronous orbit ,time it takes to rotate earth is 23hrs,56min,4sec
3. Polar orbits
An orbits with an inclination of 90 degree
Orbiting the earth at about 850km to 1000km
Generally north south direction,
Infinite number of satellites
They are not stationery with respect to ground
They require tracking or tele command system
They generally placed in sunsynchronous orbit
in sunsynchronous orbit satellite crosses the same spot on earth at the same local time each day .these are imp in remote sensing satellites.
IRNSS
india’s independent regional navigational sattelsystemlite system. system is similar to the GPS operated by USA with 24 satellites. Designed to provide accurate real time, positioning, timing services over india and the region extending to 1500 km around india.
Earth Observation Satellites
Starting with IRS-1A in 1988, ISRO has launched many operational remote sensing satellites. Today, India has one of the largest constellations of remote sensing satellites in operation.
Varieties of instruments have been flown onboard these satellites to provide necessary data in a diversified spatial, spectral and temporal resolutions to cater to different user requirements in the country and for global usage.
The data from these satellites are used for several applications covering agriculture, water resources, urban planning, rural development, mineral prospecting, environment, forestry, ocean resources and disaster management.
Navigation Satellites
Satellite is an emerging satellite based system with commercial and strategic applications. Navigation services are necessary to meet the emerging demands of the Civil Aviation requirements and to meet the user requirements of the positioning, navigation and timing based on the independent satellite navigation system.
To meet the Civil Aviation requirements, ISRO is working jointly with Airport Authority of India (AAI) in establishing the GPS Aided Geo Augmented Navigation (GAGAN)
To meet the user requirements of the positioning, navigation and timing services based on the indigenous system, ISRO is establishing a regional satellite navigation system called Indian Regional Navigation Satellite System (IRNSS).
Space Science & Exploration Satellites
Indian space programme encompasses research in areas like astronomy, astrophysics, planetary and earth sciences, atmospheric sciences and theoretical physics. Satellites come under this category are:
AstroSat,was launched on September 28, 2015, by PSLV-C30 from Sriharikota. It is the first dedicated Indian astronomy mission aimed at studying celestial sources in X-ray, optical and UV spectral bands simultaneously. One of the unique features of AstroSat mission is that it enables the simultaneous multi-wavelength observations of various astronomical objects with a single satellite.
Mars Orbiter Mission (MOM),also known as (Mangalyaan),the truly maiden interplanetary mission of ISRO, launched on November 5, 2013, successfully got inserted into Martian orbit on September 24, 2014 in its first attempt. MOM completes 4 years in its orbit on September 24, 2018 though the designed mission life of MOM was six months. It was launched on board of PSLV C25 rocket with aim of studying Martian surface and mineral composition as well as scan its atmosphere for methane (an indicator of life on Mars). MOM is credited with many achievements like cost-effectiveness, short period of realization, economical weight-budget, miniaturization of five heterogeneous science payloads etc. Phobos and Deimos, the two moons of Mars were also imaged from close distances by Mars Colour Camera (MCC).
Chandrayaan-1,India’s first mission to moon, was an unmanned spacecraft along with 11 scientific payloads built in India, UK, USA, Germany, Bulgaria and Sweden. The mission comprised an orbiter and an impactor. Launched aboard PSLV-C11 by ISRO on October 22, 2008, the spacecraft was designed to study the Moon orbiting around it at a height of 100 km from the lunar surface. It had operated much less than the intended two years, but achieved more than 90% of its planned objectives.
Chandrayaan-2,India’s second mission to the Moon is a totally indigenous mission comprising of an Orbiter, Lander and Rover. Chandrayaan-2 is planned to launch in 2019 by GSLV-F10. After reaching the 100 km lunar orbit, the Lander housing the Rover will separate from the Orbiter. After a controlled descent, the Lander will soft land on the lunar surface at a specified site and deploy a Rover. The payloads will collect scientific information on lunar topography, mineralogy, elemental abundance, lunar exosphere and signatures of hydroxyl and water-ice.
India’s Manned Mission to Space
In December 2018, the Indian government has announced allocation of 100 billion rupees for first manned space mission, set to be launched by 2022. An unmanned test launch of the project is likely scheduled for December 2020.
Also termed as Gaganyaan, this project is part of the government’s ambition to make India a global low-cost provider of services in space.
The launch vehicle for this mission will carry heavy payloads into space. For this purpose, GSLV Mk-III is being developed with cryogenic engine.
ISRO has already tested the GSLV Mk-III with experimental crew module (Re-entry & Recovery technology) and Crew Escape System (CES).
A manned space mission is very difficult to launch in terms of complexity and need of advance technology.
Scramjet (Supersonic Combusting Ramjet) engine
In August 2016, ISRO has successfully conducted the Scramjet (Supersonic Combusting Ramjet) engine test.
The Scramjet engine uses Hydrogen as fuel and the Oxygen from the atmospheric air as the oxidiser.
This test was the maiden short duration experimental test of ISRO’s Scramjet engine with a hypersonic flight at Mach 6.
ISRO’s Advanced Technology Vehicle (ATV), which is an advanced sounding rocket, was the solid rocket booster used for the test of Scramjet engines at supersonic conditions.
The new propulsion system will complement ISRO’s reusable launch vehicle that would have longer flight duration.
ISRO’s Launch Vehicles
PSLV (Polar Satellite Launch Vehicle) and GSLV (Geosynchronous Satellite Launch Vehicle) are the satellite-launch vehicles developed by ISRO.
PSLV delivers the “earth-observation” or “remote-sensing” satellites in polar orbit.
Apart from launching the remote sensing satellites to Sun-synchronous polar orbits, the PSLV is also used to launch the satellites of lower mass of about 1400 Kg to the elliptical Geosynchronous Transfer Orbit (GTO).
It is a four-staged launch vehicle with first and third stage using solid fuel and second and fourth stages using liquid fuel. Strap-on motors also used with PSLV to augment the thrust.
PSLV is classified into its various versions like core-alone version (PSLV-CA) or PSLV-XL variants.
GSLV delivers the communication-satellites to the Geosynchronous Transfer Orbit (GTO) of about 36000 Km altitude.
Two versions of the GSLV are developed by ISRO and testing phase of third version is going on. The first version, GSLV Mk-II, has the capability to launch satellites of mass up to 2,500 kg to the GTO.
GSLV MK-II is a three-staged vehicle with first stage using solid fuel, second stage using Liquid fuel and the third stage, called Cryogenic Upper Stage, using cryogenic engine.
Challenges and Opportunities in front of India’s Space Program
India is still is a developing country with vast developmental and security concerns. In this context it is very difficult to justify the allocations for space missions that do not have a direct bearing on development.
Successful launched of MOM and a planned rover onto the moon surely boosted the Indian space program. But India’s reliance on satellites has created military vulnerabilities.
An anti-satellite missile (ASAT) tested by China in 2007 has also elevated the threat of a slow-moving arms race in space.
DRDO is working on development of missile defense but it is increasingly looking to partner with the United States and other countries.
China has launched satellites for Pakistan and Sri Lanka in 2011 and 2012 respectively. This space cooperation may become another path for China to make inroads in South Asian countries.
During the starting of this decade India was highly critical of the EU effort to develop a code of conduct for outer space but in last years it has been actively engaged with the United States and the EU in particular in discussing a code of conduct and other safeguarding mechanisms.
India holds the view that reliance on the integration of outer space and cyber capabilities will only increase in future conflicts. But now beyond the maritime domain, India has been relying on foreign partners for many other satellite-based communications and data services. For instance, it continues to rely on NASA for deep space communications.
Privatization may also allow India to increase its launch capacity, which is currently at four to five per year while China does on average twenty or so launches. India does not have an explicit space policy to guide private sector participation.
ISRO also has internal constraints on its capacity to deliver.
The announcement by U.S. President Donald Trump in June 2018 about the creation of a “space force” or a sixth branch of the American armed forces has worried many including India. While India is officially committed to PAROS, or the prevention of an arms race in outer space, it is yet to formulate a credible official response to such plans. India has yet to establish a credible space command of its own.
In this context China’s reaction could be much stronger than its seemingly muted official response and it does possess a formidable space military programme that far exceeds current Indian capabilities.
Globally entrepreneurs like Elon Musk and Richard Branson began talking of space activities as independent profitable commercial ventures that can be termed as New Space revolution
Recent launches
PSLV successfully launches EOS-01 and nine customer satellite from Sriharikota.India’s Polar Satellite Launch Vehicle, in its fifty first flight (PSLV-C49), successfully launched EOS-01 along with nine international customer satellites from Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota on November 07, 2020. PSLV-C49 is the 2nd flight of PSLV in ‘DL’ configuration (with 2 solid strap-on motors)
PSLV-C50 successfully launches CMS-01 from Satish Dhawan Space Centre SHAR, Sriharikota. India’s communication satellite CMS-01 was successfully launched by PSLV-C50 on Wednesday December 17, 2020 from the Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota.
PSLV-C50 is the 52nd flight of PSLV and 22nd flight of PSLV in ‘XL’ configuration (with 6 strap-on motors). This was the 77th launch vehicle mission from SDSC SHAR, Sriharikota.India’s communication satellite CMS-01 was successfully launched by PSLV-C50 on Wednesday December 17, 2020 from the Satish Dhawan Space Centre (SDSC) SHAR, Sriharikota.
India’s Geosynchronous Satellite LaunchVehicle GSLV MkIII-M1, successfully launched the 3840 kg Chandrayaan-2 spacecraft into an earth orbit today (July 22, 2019)
Applications
Terrestrial , Arials, & Marine navigation
Disaster Management
Vehicle Tracking & Fleet Management
Integration with mobile phones
Mapping
Terristrial navigation aid for hickers & Trackers
Visual & Voice navigation for drivers
Positing accuracy better than 20m In all weather condition
Conclusion
Now the time has come for a more structured approach that enables better incubation for young talent in India. Fortunately, Antrix is open to such ideas. Various policies and acts need to change from being restrictive to being enabling.
GSLV(Geosynchronous satellite launch vehicle)
