Yet again another proud moment
etched the chronicles of Indian Space Technology with the successful launch of
the GSAT-7 satellite with the paid up launch service of European
Space Consortium's Ariane Space’s Ariane 5 ECA rocket from Kourou Space Port,
French Guiana on 30th August. Ariane-5 ECA (cryogenic evolution type
A), has an improved Ariane 5 generic launcher, capable of carrying a pay load
of up to 9.6 tonnes. Some major changes have been brought in the architecture
to carry heavier loads into GTO (Geosynchronous Transfer Orbit). Hence it
could launch EUTELSAT25B/E and GSAT-7 together. It had launched INSAT-3D
satellite on July 25th intended for meteorological observation and
monitoring land/ocean surfaces.
GSAT-7
or Rukmini has the unique distinction of being the first Indian satellite
exclusively dedicated for military purpose and especially, Indian Navy is set
to receive greater boost through this launch. GSAT-7 is a multi-band
communication satellite developed by Indian Space Research Organisation (ISRO).
It is the sixth satellite from the pack of seven INSAT-4 series communication
satellites planned to be launched and this satellite will carry payloads in UHF
(Ultra High Frequency), S band, C band and Ku band with appropriate antennae.
GSAT-7 is
the most advanced communication satellite to provide wide range of service
spectrum from low bit rate voice to high bit rate data communication. It is
designed to modernize the communication among the naval ships, endowing it with
better satellite communication and intelligence survey. This would help to have
a complete surveillance over 2000 nautical miles of the Indian Ocean Region.
This will enable communication between the naval ships through highly encrypted
coding system and help in identifying the enemy ships and submarines.
Conversely each of the ships in the naval fleet would have a comprehensive
digital map to locate the ships and communication between naval ships will be
through this satellite. Similarly the Indian Army will get vital inputs about
stealthy movements over the land too. Tracking the movements of the enemy
across our belligerent borders will enhance our ability for a swift response.
It has greater potential of integrating the warships, submarines and aircrafts
through a highly encrypted data network. Previously, maritime communication for
defence was provided by leasing required transponders of Inmarsat
(International Maritime Satellite Organisation, a British satellite
telecommunication company) satellite. With this launch India has joined the
club of the top five countries USA, Britain, Russia, China and France which
have satellites customized for defence communications.
While
India has attained the great distinction of having an exclusive satellite for
military purpose, it is plagued by its inability to launch a big communication
satellites weighing more than 2.5 tons to place in GTO (Geosynchronous
Transfer Orbit) on its own. To overcome this limitation and to get hands-on
experience on cryogenic stages/engines ISRO procured cryogenic stages from
Russia and had successfully developed the necessary infrastructure and a new
vehicle GSLV (Geosynchronous Satellite Launch Vehicle) - MkI to place 2 to 2.5
ton satellites in GTO. GSLV-MKI had three consecutive successful
launches since debut in 2001. Meanwhile, India has developed and satisfactorily
qualified its own cryogenic engine after the successful tests in 2007. It is on
the verge of launching a communication satellite of 2.5 ton class using
indigenous cryogenic engine (ICE) as the final stage of GSLV - MkII in the next
few months. At least two successful launches have to be carried out before
it is declared operational. That would be a major milestone in the saga of ISRO
enroute to the development and operationalizing GSLV -MkIII (with enhanced
capacity of each rocket stage) to place 4.5 to 5 tons class of heavier
communication satellites of INSAT-4 series. Only then would India be fully self-reliant
and also be competitive player in the multimillion dollar international launch
market.
All this
was possible due to the consistent progress ISRO had made in developing various
launch vehicles from the initial SLV (Satellite Launch Vehicle) which was first
developed in late 1970’s, to through ASLV (Augmented Satellite Launch Vehicle),
a five stage engine with solid and liquid fuels that could carry a pay load of
150 kg in late 1980’s to the reliable work horse PSLV (Polar Satellite Launch
Vehicle) in early 1990s . However, the ASLV development plans were aborted soon
as ISRO made a mid-course correction to move over directly to develop the next
genre of launch vehicle PSLV which is capable of launching 1600 kg satellites
in 620 km sun-synchronous polar orbit or 1050 kg satellite in GTO. Such a
switch over and prioritization would help ISRO to cut down the time line to
catch up with the advanced space faring nations and avoid wasteful expenditure
since by then ISRO learnt the technologies required for transition to bigger
launch vehicles and there was no commercial market for ASLV. PSLV has
four stages that use solid and liquid propulsion systems alternatively. India has
so far successfully launched 58 (23 Indian and 35 foreign) satellites with PSLV
so far. The phenomenal success of PSLV gave the correct inputs, bench marks and
the confidence to go ahead to build bigger vehicles like GSLV. The final/third
stage of GSLV is the cryogenic stage, which is more efficient compared to the
liquid stage in PSLV. Thus it is inevitable for India to master the cryogenic
technology (which took US, Russia and France a couple of decades) to remain in
the business of global satellite launching.
Geosynchronous
Satellite Launch Vehicles (GSLV) are needed to launch INSAT-4 series of
geosynchronous satellites. India has initiated GSLV project in 1990. India has
signed a contract with Russia to supply 7 cryogenic engines of 7.5 tons thrust along
with the transfer of cryogenic technology. However, GSLV development is
beset with both technological and operational problems. In 1993, the US
severely objected Russia selling cryogenic technology to India as this
would be a violation under the Missile technology Control regime (MTCR). MTCR
is an informal agreement and voluntary partnership between 34 members. The
regime was formed by the G-7 industrial nations-US, UK, France, Canada, Italy,
Germany and Japan with an objective of limiting the proliferation of the
missiles and unmanned aerial vehicle (UAV) technology capable of carrying 500kg
payload at least 300km. It has 34 members which includes Russia. As per
MTCR guidelines, members established a “no undercut” policy means if a member
denies sale of technology to another country, then the policy has to be
strictly adhered by all other members. Thus now 117 nations enforce
restrictions on exports to control the proliferation of UAV’s.
India has
so far carried out 7 launches (6 with Russian engines and one Indian) and three
have failed. GSLV D1 (Developmental Flight 1) had its first flight in 2001
carrying the GSAT-1 satellite which was claimed as partial success by ISRO. It
was followed by successful launch of GSAT-2 followed by GSAT-3 or EduSat by
GSLV D2 and GSLV F01 respectively. Owing to this launch, GSLV was declared
operational. GSLV F02 failed to put INSAT-4C into orbit GSLVF-04 carrying
INSAT-4CR was a partial success as the satellite was rescued by boosters and
put into the orbit. Again GSLV D3 and D4 failed to launch GSAT-4 and GSAT-5p.
The failure was attributed to fault Russian-built connecters in the interstage
adapters. But Russian’s refused to accept this investigation and there was a
disagreement between the two camps. Thus the design and development of the
launch vehicle GSLV MkI came to grinding halt. Following the poor success rate
of GSLV, it has become least reliable.
After
GSLV D4 failure, ISRO tried to rectify the defects and designed GSLVD5. Initial
tests were carried out at High Altitude ignition meaning by simulating vacuum
like conditions to ensure a successful launch. GSLV MkII-D5 the rocket
containing the indigenous cryogenic stage, carrying the communication
satellite was scheduled to be launched on Aug 19th. But during the
pre-launch pressurisation phase a leak was observed in the UH25 fuel system of
the liquid second stage. Hence, about two hours before its lift off, launch was
called off and the vehicle was secured. Cryogenic Upper Stage (CUS) is the most
efficient with the highest specific impulse and so, a crucial stage that
propels the rocket in vacuum conditions. It is powered by liquid hydrogen
propellant and liquid oxygen as oxidiser mixed in right proportions to gives
the thrust for satellite lift off. The indigenous cryogenic stage used
can create a thrust of around 7.5 tonnes and hence is more efficient in
carrying larger payloads. ISRO perplexed with the shortcomings of the GSLV D5
(MkII) is going back to drawing board and gearing up for the next launches.
Till now
ISRO has been single-handedly involved in developing cryogenic stages since
every other country who has this technology closely guards it because of its
sophisticated and complicated nature. The complexity could be understood if one
realises that for hydrogen to be in a full liquid state without
evaporating at atmospheric pressure, it needs to be cooled to 20.28 K
(−423.17°F/−252.87°C). One common method of obtaining liquid hydrogen involves
a compressor resembling a jet engine in both appearance and principle. Liquid
hydrogen is typically used in concentrated form. As in any gas, storing it as
liquid takes less space than storing it as a gas at normal temperature and
pressure. However, the liquid density is very low compared to other common fuels.
Once liquefied, it can be maintained as a liquid in pressurized and thermally
insulated containers. Liquid oxygen has a density of 1.141 g/cm3
(1.141 kg/L) and is cryogenic with a freezing point of 50.5 K
(−368.77 °F, −222.65 °C) and a boiling point of 90.19 K
(−297.33 °F, −182.96 °C) at 101.325 kPa (760 mmHg). Liquid oxygen has
an expansion ratio of 1:861 under 1 standard atmosphere (100 KPa) and
20 °C (68 °F). Because of its cryogenic nature, both liquid hydrogen
and liquid oxygen can cause the materials it touches to become extremely
brittle. Apart from all this, it is extremely dangerous if anything goes wrong
due to the explosive nature of these propellants. The magnitude of the extreme
complexity can't be understood by a non-technical person. And the giant leap
from GSLV MkII to GSLV MKIII can be understood form the configuration of GSLV
MKIII which has two identical S200 Large Solid Booster (LSB) with 200 tonne
solid propellant that are strapped as first stage, the L110 re-startable liquid
stage as the second stage and the third stage is the C25 LOX/LH2 cryo stage of
25 tonne thrust. This is a phenomenal improvement vis-a-vis PSLV and earlier
versions of GSLVs.
Recently
it has announced its interest in investing RS 139 crores setting up a unit in Hindustan
Aeronautics Limited (HAL) for fabrication and manufacturing of cryogenic stages.
There is urgent need for such alternative facility as ISRO is planning to build
cryogenic stages as originally planned or semi-cryogenic engines and test
the new variant GSLV MKIII with higher ton thrust as soon as possible. With
space science expanding its horizons it has emerged into a global market of
worth 180 billion dollars. At this stage India can hardly afford to lay back.
The
triumph of future space programs and launches lies in the success of the
planned GSLV progression. Ambitious projects like Chandrayaan-2 and a manned
vehicle into orbit are programmed through the GSLV launch vehicles. Currently,
India is forced to outsource launching of heavier satellites services to a
foreign country which is cost ineffective. It is inevitable for India to
develop a potential GSLV launcher to become self-reliant and to play a lead
role in telecommunications and satellite launching.
Yet again another proud moment
etched the chronicles of Indian Space Technology with the successful launch of
the GSAT-7 satellite with the paid up launch service of European
Space Consortium's Ariane Space’s Ariane 5 ECA rocket from Kourou Space Port,
French Guiana on 30th August. Ariane-5 ECA (cryogenic evolution type
A), has an improved Ariane 5 generic launcher, capable of carrying a pay load
of up to 9.6 tonnes. Some major changes have been brought in the architecture
to carry heavier loads into GTO (Geosynchronous Transfer Orbit). Hence it
could launch EUTELSAT25B/E and GSAT-7 together. It had launched INSAT-3D
satellite on July 25th intended for meteorological observation and
monitoring land/ocean surfaces.
GSAT-7
or Rukmini has the unique distinction of being the first Indian satellite
exclusively dedicated for military purpose and especially, Indian Navy is set
to receive greater boost through this launch. GSAT-7 is a multi-band
communication satellite developed by Indian Space Research Organisation (ISRO).
It is the sixth satellite from the pack of seven INSAT-4 series communication
satellites planned to be launched and this satellite will carry payloads in UHF
(Ultra High Frequency), S band, C band and Ku band with appropriate antennae.
GSAT-7 is
the most advanced communication satellite to provide wide range of service
spectrum from low bit rate voice to high bit rate data communication. It is
designed to modernize the communication among the naval ships, endowing it with
better satellite communication and intelligence survey. This would help to have
a complete surveillance over 2000 nautical miles of the Indian Ocean Region.
This will enable communication between the naval ships through highly encrypted
coding system and help in identifying the enemy ships and submarines.
Conversely each of the ships in the naval fleet would have a comprehensive
digital map to locate the ships and communication between naval ships will be
through this satellite. Similarly the Indian Army will get vital inputs about
stealthy movements over the land too. Tracking the movements of the enemy
across our belligerent borders will enhance our ability for a swift response.
It has greater potential of integrating the warships, submarines and aircrafts
through a highly encrypted data network. Previously, maritime communication for
defence was provided by leasing required transponders of Inmarsat
(International Maritime Satellite Organisation, a British satellite
telecommunication company) satellite. With this launch India has joined the
club of the top five countries USA, Britain, Russia, China and France which
have satellites customized for defence communications.
While
India has attained the great distinction of having an exclusive satellite for
military purpose, it is plagued by its inability to launch a big communication
satellites weighing more than 2.5 tons to place in GTO (Geosynchronous
Transfer Orbit) on its own. To overcome this limitation and to get hands-on
experience on cryogenic stages/engines ISRO procured cryogenic stages from
Russia and had successfully developed the necessary infrastructure and a new
vehicle GSLV (Geosynchronous Satellite Launch Vehicle) - MkI to place 2 to 2.5
ton satellites in GTO. GSLV-MKI had three consecutive successful
launches since debut in 2001. Meanwhile, India has developed and satisfactorily
qualified its own cryogenic engine after the successful tests in 2007. It is on
the verge of launching a communication satellite of 2.5 ton class using
indigenous cryogenic engine (ICE) as the final stage of GSLV - MkII in the next
few months. At least two successful launches have to be carried out before
it is declared operational. That would be a major milestone in the saga of ISRO
enroute to the development and operationalizing GSLV -MkIII (with enhanced
capacity of each rocket stage) to place 4.5 to 5 tons class of heavier
communication satellites of INSAT-4 series. Only then would India be fully self-reliant
and also be competitive player in the multimillion dollar international launch
market.
All this
was possible due to the consistent progress ISRO had made in developing various
launch vehicles from the initial SLV (Satellite Launch Vehicle) which was first
developed in late 1970’s, to through ASLV (Augmented Satellite Launch Vehicle),
a five stage engine with solid and liquid fuels that could carry a pay load of
150 kg in late 1980’s to the reliable work horse PSLV (Polar Satellite Launch
Vehicle) in early 1990s . However, the ASLV development plans were aborted soon
as ISRO made a mid-course correction to move over directly to develop the next
genre of launch vehicle PSLV which is capable of launching 1600 kg satellites
in 620 km sun-synchronous polar orbit or 1050 kg satellite in GTO. Such a
switch over and prioritization would help ISRO to cut down the time line to
catch up with the advanced space faring nations and avoid wasteful expenditure
since by then ISRO learnt the technologies required for transition to bigger
launch vehicles and there was no commercial market for ASLV. PSLV has
four stages that use solid and liquid propulsion systems alternatively. India has
so far successfully launched 58 (23 Indian and 35 foreign) satellites with PSLV
so far. The phenomenal success of PSLV gave the correct inputs, bench marks and
the confidence to go ahead to build bigger vehicles like GSLV. The final/third
stage of GSLV is the cryogenic stage, which is more efficient compared to the
liquid stage in PSLV. Thus it is inevitable for India to master the cryogenic
technology (which took US, Russia and France a couple of decades) to remain in
the business of global satellite launching.
Geosynchronous
Satellite Launch Vehicles (GSLV) are needed to launch INSAT-4 series of
geosynchronous satellites. India has initiated GSLV project in 1990. India has
signed a contract with Russia to supply 7 cryogenic engines of 7.5 tons thrust along
with the transfer of cryogenic technology. However, GSLV development is
beset with both technological and operational problems. In 1993, the US
severely objected Russia selling cryogenic technology to India as this
would be a violation under the Missile technology Control regime (MTCR). MTCR
is an informal agreement and voluntary partnership between 34 members. The
regime was formed by the G-7 industrial nations-US, UK, France, Canada, Italy,
Germany and Japan with an objective of limiting the proliferation of the
missiles and unmanned aerial vehicle (UAV) technology capable of carrying 500kg
payload at least 300km. It has 34 members which includes Russia. As per
MTCR guidelines, members established a “no undercut” policy means if a member
denies sale of technology to another country, then the policy has to be
strictly adhered by all other members. Thus now 117 nations enforce
restrictions on exports to control the proliferation of UAV’s.
India has
so far carried out 7 launches (6 with Russian engines and one Indian) and three
have failed. GSLV D1 (Developmental Flight 1) had its first flight in 2001
carrying the GSAT-1 satellite which was claimed as partial success by ISRO. It
was followed by successful launch of GSAT-2 followed by GSAT-3 or EduSat by
GSLV D2 and GSLV F01 respectively. Owing to this launch, GSLV was declared
operational. GSLV F02 failed to put INSAT-4C into orbit GSLVF-04 carrying
INSAT-4CR was a partial success as the satellite was rescued by boosters and
put into the orbit. Again GSLV D3 and D4 failed to launch GSAT-4 and GSAT-5p.
The failure was attributed to fault Russian-built connecters in the interstage
adapters. But Russian’s refused to accept this investigation and there was a
disagreement between the two camps. Thus the design and development of the
launch vehicle GSLV MkI came to grinding halt. Following the poor success rate
of GSLV, it has become least reliable.
After
GSLV D4 failure, ISRO tried to rectify the defects and designed GSLVD5. Initial
tests were carried out at High Altitude ignition meaning by simulating vacuum
like conditions to ensure a successful launch. GSLV MkII-D5 the rocket
containing the indigenous cryogenic stage, carrying the communication
satellite was scheduled to be launched on Aug 19th. But during the
pre-launch pressurisation phase a leak was observed in the UH25 fuel system of
the liquid second stage. Hence, about two hours before its lift off, launch was
called off and the vehicle was secured. Cryogenic Upper Stage (CUS) is the most
efficient with the highest specific impulse and so, a crucial stage that
propels the rocket in vacuum conditions. It is powered by liquid hydrogen
propellant and liquid oxygen as oxidiser mixed in right proportions to gives
the thrust for satellite lift off. The indigenous cryogenic stage used
can create a thrust of around 7.5 tonnes and hence is more efficient in
carrying larger payloads. ISRO perplexed with the shortcomings of the GSLV D5
(MkII) is going back to drawing board and gearing up for the next launches.
Till now
ISRO has been single-handedly involved in developing cryogenic stages since
every other country who has this technology closely guards it because of its
sophisticated and complicated nature. The complexity could be understood if one
realises that for hydrogen to be in a full liquid state without
evaporating at atmospheric pressure, it needs to be cooled to 20.28 K
(−423.17°F/−252.87°C). One common method of obtaining liquid hydrogen involves
a compressor resembling a jet engine in both appearance and principle. Liquid
hydrogen is typically used in concentrated form. As in any gas, storing it as
liquid takes less space than storing it as a gas at normal temperature and
pressure. However, the liquid density is very low compared to other common fuels.
Once liquefied, it can be maintained as a liquid in pressurized and thermally
insulated containers. Liquid oxygen has a density of 1.141 g/cm3
(1.141 kg/L) and is cryogenic with a freezing point of 50.5 K
(−368.77 °F, −222.65 °C) and a boiling point of 90.19 K
(−297.33 °F, −182.96 °C) at 101.325 kPa (760 mmHg). Liquid oxygen has
an expansion ratio of 1:861 under 1 standard atmosphere (100 KPa) and
20 °C (68 °F). Because of its cryogenic nature, both liquid hydrogen
and liquid oxygen can cause the materials it touches to become extremely
brittle. Apart from all this, it is extremely dangerous if anything goes wrong
due to the explosive nature of these propellants. The magnitude of the extreme
complexity can't be understood by a non-technical person. And the giant leap
from GSLV MkII to GSLV MKIII can be understood form the configuration of GSLV
MKIII which has two identical S200 Large Solid Booster (LSB) with 200 tonne
solid propellant that are strapped as first stage, the L110 re-startable liquid
stage as the second stage and the third stage is the C25 LOX/LH2 cryo stage of
25 tonne thrust. This is a phenomenal improvement vis-a-vis PSLV and earlier
versions of GSLVs.
Recently
it has announced its interest in investing RS 139 crores setting up a unit in Hindustan
Aeronautics Limited (HAL) for fabrication and manufacturing of cryogenic stages.
There is urgent need for such alternative facility as ISRO is planning to build
cryogenic stages as originally planned or semi-cryogenic engines and test
the new variant GSLV MKIII with higher ton thrust as soon as possible. With
space science expanding its horizons it has emerged into a global market of
worth 180 billion dollars. At this stage India can hardly afford to lay back.
The
triumph of future space programs and launches lies in the success of the
planned GSLV progression. Ambitious projects like Chandrayaan-2 and a manned
vehicle into orbit are programmed through the GSLV launch vehicles. Currently,
India is forced to outsource launching of heavier satellites services to a
foreign country which is cost ineffective. It is inevitable for India to
develop a potential GSLV launcher to become self-reliant and to play a lead
role in telecommunications and satellite launching.
@ Copyrights reserved.