India’s progress in space has been very systematic starting
with experimental satellites like Aryabhatta, Bhaskara, Apple and Rohini. It
performed satellite application experiments like SITE, STEP and Apple
application programme. The operational space services consist of INSAT system
and Indian Remote Sensing Satellites (IRS). The Indian Space Research
Organisation (ISRO) made a modest beginning in launch vehicles like SLV-3, and
ASLV. The first development flight of the indigenous Polar Satellite Launch Vehicle
(PSLV) was carried out in 1992 which could put 1,000 kg class remote sensing
satellite into 900 km polar sun-synchronous orbit.
India has acquired eminence in world class space science. It
has mastered modern space technology and its various applications for the
benefit of society. New space technology is being utilised for
telecommunications, television broadcasts, weather watch and for providing
information relating to agriculture, forests, water resources and minerals to
mention a few.
In the past three decades ISRO has built an infrastructure
sector of space programme – construction and operation of satellites and their
launch vehicles, ground station and sensors. ISRO has also collaborated with
other Indian institutions and over 250 private industries. Both private and
public sectors manufacture a vanity of equipment and materials – light alloy
structure for inter-stages, motor cases, liquid thrusters, propellant tanks,
gas generation and electronic packages. The second launch facility at
Sriharikota at a cost of Rs.280 crore is under construction.
Launch Business
In May last year ISRO embarked on the launch business
through PSLV-C2 launch, thereby creating a strong impact on the global space
market by successfully launching two foreign satellites along with its own
ocean monitoring remote sensing satellite. They were launched by the PSLV.
ISRO’s marketing agency Autrix Corporation has entered the world market with
great success. It aims to secure about 20 per cent of the global share of
remote sensing products. It is gratifying to note that PSLV with certain
modifications can put payloads up to 4,000 kg into low earth orbits (LEO’s) and
up to 800 kg into geo-synchronous transfer orbits (GTO’s).
So far India has been dependent on Ariane Space, the French
space agency, for launching its satellites. But gradually ISRO is trying to
make use of its own launching vehicles. Sriharikota’s proximity to the equator
gives it a better payload advantage for any polar launch. The flight of
INSAT-3B, INSAT-3A and the GSLV will take ISRO into higher orbit. Once the GSLV
is declared operational, India’s future INSAT satellites will be launched by
this rocket.
Reduced Costs
The Chairman of ISRO, Dr K Kasturirangan has projected a
significant lowering of space launch costs in the country in the next few
decades. While the cost for positioning one kg of material in space today was
$20,000 it was presaged that the same would come down to $5000 by 2007 and as
low as $500 per kg between 2030-2050. Fully reusable vehicles have also been
foreseen. He reveals hat the performance efficiency of Indian spacecraft is on
the increase.
According to Aerospace America, Indian remote sensing
commercial satellites are among the best in the world. IRS-1C and IRS-ID
provide the best high resolution data to the user community anywhere in the
world and the data from these satellites are being received and used by several
countries including the US, Japan, Germany, Korea, Thailand and Dubai.
India has now established credibility as a space technology
vendor. The world’s largest satellite manufacturer in the US has ordered
satellite hardware worth US $700,000 from India. India’s space technology
export earnings have tripled from around Rs.10 crore to Rs.30 crore over the
past three years.
INSAT-3B
Recently, ISRO launched the first of the third generation
communication satellite INSAT-3B. This 2,070 kg satellite is primarily intended
for business, development and mobile communications. It would almost double the
transponder capacity. It would provide the first set of transponders for
interactive training and developmental communications as part of the Vidya
Vahini programme announced by the Prime Minister.
Indian space scientists are now engaged in the development
of cryogenic engine, required for GSLV in future. Last February the test of
first home-made cryogenic rocket engine was carried out but a hydrogen leak
probably led to premature termination of the test. But scientists say the
problem will soon be solved. The test was carried out at the Liquid Propulsion
Systems Centre at Mahendragiri in Tamil Nadu.
Experts agree that India crossed an important milestone in
the development of indigenous cryogenic upper stage for GSLV. The engine had
employed liquid hydrogen and liquid oxygen. This short duration test proved
that many operations were successful which were done for the first time.
Valuable data have been collected which are being analysed for further tests.
Towards Moon
Coming on the heels of all these developments is ISRO’s plan
to go to the moon. ISRO has already begun preliminary studies to assess the
feasibility of undertaking such a mission. ISRO’s satellite centre director, Dr
P S Goel, says the study will cover scientific benefits which could be derived
from the lunar mission. ISRO’s PSLV is a proven rocket and is capable of flying
up to the lunar orbit. If India’s mission to the moon succeeds, then it would
have joined the US and the former Soviet Union in making its presence felt in
the lunar environment.
ISRO is also planning to launch a series of remote sensing
satellites with a variety of applications including one solely dedicated to the
field of astronomy.
Indian space scientists foresee several developments in the
new millennium when they can scale new heights. Revolutionary developments in
the fields of communication, information and micro- electronics are driving
greater convergence and forging new directions for aerospace programmes.
"Space would be a strong tool for development in future" sys Dr
Kasturirangan. He is of the view that from development of civil applications
such as personal mobile communications at a global level and management of
natural disasters to futuristic vistas such as space power generation and space
tourism the new possibilities are unlimited.
India’s experience has clearly shown that the investment in
space always pays through remote sensing and telecommunications. By being fully
self-reliant in space activities, it is certain that the resulting contribution
from the space programme to the Indian GDP will be markedly significant.
Harish Agrawal
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