DOKLAM STANDOFF OVER

The latest news coming in is that armies of both the nations(India and China) have decided to simultaneously withdraw their troops from the conflict region. This marks the end of the three months long standoff between the two countries. 

Will update further about the whole issue in detail in my next post.

"JAI HIND" 

 

REPLACEMENT SATELLITE READY FOR LAUNCH

IRNSS-1H, the eighth satellite of the IRNSS constellation will be launched on 31st August, 2017 at 18:59 Hrs IST from SHAR, Sriharikota using PSLV-C39 launch vehicle.

IRNSS-1H is a replacement satellite that will replace IRNSS-1A, the first satellite of the constellation. The latter became redundant after the failure of its all three atomic clocks onboard. The satellite was launched on 1 July, 2013 using PSLV-C22 rocket. The redundant satellite will continue to function but the data sent by it will be coarse, thus of no use. The mission life of each of the satellite was 10 years. Failure in just 4 years raised some serious concerns regarding the ambitious program.

It is being said that ISRO has replaced the atomic clocks in IRNSS-1H with the ones from a different vendor. The clocks were supplied by Spectratime, a Swiss firm and market leader in manufacturing of such instruments.

The NAVIC(Navigation with Indian Constellation) system, similar to the GPS and GLONASS provides navigation facilities with an accuracy of 10 meters to public users and 0.1 meters for military(restricted usage).

In picture, IRNSS-1H in a clean room in SDSC SHAR

Image Credits: ISRO

NAVIC PROGRAM SUFFERS A BLOW

IRNSS-1A, the first satellite in the IRNSS constellation has become redundant after the failure of all three atomic clocks onboard. The satellite was launched on 1 July, 2013 using PSLV-C22 rocket. 

The satellite was the first one among the series of 7 satellites of the IRNSS constellation to be placed in orbit. The NAVIC(Navigation with Indian Constellation) system, similar to the GPS and GLONASS, provides navigation facilities with an accuracy of 10 meters to public users and 0.1 meters for military usage.

The satellite had 3 rubidium atomic clocks, one primary and two as backups. The first clock failed in July, 2016 and the other two failed some months back. The failure of all three clocks has made the satellite redundant and thus requires a replacement. Reason for the failure is still unknown. The clocks were supplied by Spectratime, a Swiss firm and market leader in manufacturing such instruments. 

Rubidium atomic clocks are most widely used clocks in space applications and are considered to be quite accurate along with being relatively cheaper than hydrogen maser clocks. The principle of navigation by satellite is based on the transmission of signals coming from at least four satellites, to the users. To get very precise location data, these signals must be perfectly synchronized. The extremely precise measurement of time on board each satellite, achieved through atomic clocks, is thus a central condition for the positioning performance of the system. 

The clocks in GLONASS system have also failed which were supplied by the same firm. ISRO had signed a contract worth 4 million Euros with Spectratime in 2004 to supply clocks for 9 satellites of IRNSS program. 7 satellites in orbit and 2 satellites as back-ups. These clocks provide an accurate time measurement of around 10 billionths of a second per day. 

ISRO has decided to launch a replacement for the failed satellite. The replacement satellite IRNSS-1H is expected to be launched in second half of 2017. It is being said that ISRO has replaced the atomic clocks onboard IRNSS-1H with new ones. It has also been heard from ISRO sources that two more clocks on other satellites have developed glitches and hence all the remaining satellites are being run on only one clock and keeping two on off mode to extend the life of satellites. While the initial plan was to run two clocks and keep the remaining one as back up.     

The redundant satellite will continue to function but the data sent by it will be coarse, thus of no use. The mission life of each of the satellite was 10 years. Failure in just 4 years raises some serious concerns regarding the ambitious program. 

Image Credits: ISRO 

IRNSS-1A

CRYOGENIC HURDLE CLEARED

The Indian Space Research Organisation (ISRO) successfully tested its indigenously developed Cryogenic Upper Stage (CUS) for GSLV MkIII on February 17, 2017. The cryogenic stage designated as C25 was tested for a flight duration of 640 seconds at ISRO Propulsion Complex (IPRC) in Mahendragiri. C25 Stage had earlier been tested successfully for 50 seconds on January 25, 2017 to validate all the systems. 

Prior to Stage development hot tests, three CE20 engines were realised and two engines were subjected to qualification tests in sea level conditions. This included 800 seconds duration hot test and the third engine identified for flight was tested in high altitude conditions for a duration of 25 seconds.

This Stage test is a significant milestone as it is the last in series of engine and stage development hot tests before the first development flight of GSLV MkIII, expected in April, 2017.

The C25 stage is the most powerful upper stage developed by ISRO and uses Liquid Oxygen (LOX) and Liquid Hydrogen (LH2) propellant combination.  The stage carries 27.8 tons of propellants loaded in two independent tanks. Development of a cryogenic stage has unique design challenges, with liquid Hydrogen stored at -253 deg C and liquid Oxygen stored at -195 deg C in its tanks. To store these cryogenic fluids, special multi-layer insulation is provided for the tanks and other structures.

The development of the cryogenic stage was led by Liquid Propulsion Systems Centre (LPSC) with support from various System Development Agencies from other centres of ISRO, viz., Vikram Sarabhai Space Centre (VSSC), ISRO Propulsion Complex (IPRC) and Sathish Dhawan Space Centre (SDSC), SHAR.

The Cryogenic Stage development tests were carried out in two phases. First, the Stage was subjected to fluid mock-up, wherein the stage preparation and servicing at launch complex in SDSC, SHAR, Shriharikota was completed to prove all the ground facilities established for servicing the cryogenic stage. This was followed by testing of the Stage at ISRO Propulsion Complex, Mahendragiri. From the Stage realisation to completion of testing was accomplished in four months.

The performance of the Stage during the hot test was as predicted. Successful hot test for flight duration qualifies the design of the stage and the robustness of the facilities conceived and established towards its development.

The flight cryogenic stage is in advanced stage of realisation, and forms the upper stage of GSLV MK-III, the next generation launch vehicle of ISRO, capable of launching 4 ton class satellites into Geosynchronous Transfer Orbit (GTO). The vehicle consists of two solid strap-ons (S200) motors, one earth storable liquid core stage (L110) and the Cryogenic Upper Stage (C25).

The GSLV MK-III vehicle integration activities are in progress at SDSC, SHAR for its first development flight (GSLV MkIII-D1) targeted for April 2017.

Source: ISRO

Image Credits : ISRO

#BelieveInIsro

"JAI HIND"

                                                              

               

                                           

                            

104 SATELLITES IN ONE GO

Yes you read that right. Not 4 not 10, it is 104. 

In its thirty-ninth flight on 15th February, 2017, PSLV C-37, the star performer of ISRO blasted off from SDSC(Satish Dhawan Space Center) SHAR(Shriharikota) along with 104 satellites on board. Flight which took off at 09:28 AM IST, took a little less than 29 minutes to place all its 104 passengers in their designated orbits.

The primary payload on board the launcher was CARTOSAT-2 series satellite. Weighing around 714 kg at launch, the satellite is similar to 4 other CARTOSAT satellites currently in orbit. The satellite was injected in 505 km Sun Synchronous Orbit(SSO) and would later be brought to its operational orbit by firing the Liquid Apogee Motor(LAM) of the satellite.

CARTOSAT will provide regular remote sensing services using its Panchromatic and Multi-Spectral cameras. The imagery sent by the satellites will be used for cartographic applications, urban and rural applications, utility management like road network networking , water distribution, etc.

Besides CARTOSAT, there were two other Indian passengers on the flight. PSLV C-37 carried two ISRO Nano Satellites(INS). INS-1-A and INS-1-B. Basically INS on board PSLV this time are mainly technology demonstrators having few missions to be carried out by them. INS-1-A had a lift off weight of 8.4 kg while INS-1-B weighed 9.7 kg at lift-off.

101 of 104 satellites launched were from foreign customers. 96 were from USA, 1 each from Israel, Kazakhstan, The Netherlands, Switzerland and UAE. Together, the foreign satellites weighed 645.9 kg at lift-off.

This mission was special as it was for the first time that so many satellites were being send into space at one go. With such a big number, the complexities associated with the mission increases many-fold. The satellite release mechanism which releases the payloads after reaching the desired orbit, had to be modified and function accurately each of the 104 times. No margin of error at all.

This mission is just an example of the growing stature of ISRO in the space community. ISRO's PSLV is now seen as one of the most trusted launcher in the world for the launch of polar satellites. We are growing very fast and now we are preparing the next two important launch missions. One being the launch mission of GSLV MK-II and other one, the most awaited one, the launch mission of the big daddy, GSLV MK-III.

Stay tuned for more.

Image Credits: ISRO

#BelieveInIsro   

"JAI HIND"

     

                                       

EXCITING WEEK FOR ISRO

This week has been very crucial for ISRO as it achieved 2 major milestones in a span of 3 days.
The first one being the successful flight of PSLV C-37, launched from SDSC SHAR on 15th February, which placed 104 satellites into orbit, 101 of them belonging to foreign customers.

The second major milestone was the successful test of ingenuously developed cryogenic engine for full duration of 640 seconds, at ISRO Propulsion Complex, Mahendragiri. The engine labeled as C25 was earlier tested for a duration of 50 seconds on 25th January, 2017 to validate all the systems.

I will be writing on both of these events in detail in my next two articles. So stay tuned.

#BelieveInIsro

"JAI HIND"

                                     

PDV TEST SUCCESSFULL

India Successfully Test-Fires interceptor Missile.

The PRITHVI Defense Vehicle on its course to a spectacular success.

BALASORE: India today successfully test-fired its interceptor missile off the Odisha coast, achieving a significant milestone in the direction of developing a two-layered Ballistic Missile Defence system.

The interceptor was launched from Abdul Kalam Island (Wheeler Island) of ITR at about 7.45 AM.

This mission, termed as "PDV mission is for engaging the targets in the exo-atmosphere region at an altitude above 50 km of earth's atmosphere", said a Defence Research Development Organisation (DRDO) official.

"Both, the PDV interceptor and the two stage target missile, were successfully engaged," he said.

The target was developed for mimicking a hostile Ballistic Missile approaching from more than 2000 km away was launched from a ship anchored in the Bay of Bengal.

In an automated operation, radar-based detection and tracking system detected and tracked the enemy's ballistic missile.

The computer network with the help of data received from radars predicted the trajectory of the incoming Ballistic Missile.

PDV that was kept fully ready, took-off once the computer system gave the necessary command for lift-off. The Interceptor guided by high accuracy Inertial Navigation System (INS) supported by a Redundant Micro Navigation System moved towards the estimated point of the interception.

Once the missile crossed the atmosphere, the Heat Shield ejected and the IR Seeker dome opened to look at the Target location as designated by the Mission Computer.

With the help of Inertial Guidance and IR Seeker, the missile moved for the interception. All events were monitored in real-time by the Telemetry/Range Stations, at various other locations.

In Pic: PDV

Source: Indian Defence Updates

GREETINGS ON THE REPUBLIC DAY OF INDIA

ASLI UDAAN ABHI BAKI HAI,
AAKHRI INTEHAAN ABHI BAKI HAI,
ABHI TO NAAPI HAI MUTTHI BHAR ZAMEEN HUMNEN,
SAAR AASMAN ABHI BHI BAKI HAI............!!!!!!

Happy 68th "REPUBLIC DAY" to all INDIANS.........

NEVER FORGET THE CONTRIBUTION OF OUR DEFENSE FORCES IN KEEPING THAT TRI-COLOUR FLAG WAVING HIGH...........

"JAI HIND"

In Pic: Kargil War Memorial 

INDIAN ARMY DAY

Wish you all a very Happy Indian Army Day. 

The nation will always remain indebted to the supreme sacrifices made by our soldiers. From protecting sovereignty of the country to facing any external aggression, from eliminating terrorists to carrying out rescue operations during natural and man-made disasters, Indian Army is always there 24 hours a day, 7 days a week and 365 days of the year.

A big salute to all the veterans and the men and women in the line of duty.

In pic, Honourable President of India Shri Pranab Mukherjee, paying tributes at Amar Jawan Jyoti.

#NeverForgiveNeverForget

2017, AN YEAR TO WATCH OUT FOR ISRO

2017 is going to be an eventful year for ISRO with several important launches planned back to back. ISRO is already very close to achieving its aim of having at least one launch mission every 30 days.

The first launch planned this year is the launch of CARTOSAT-2D satellite using PSLV-C37 along with several small payloads from foreign customers. The launch is expected in early February.

The second launch and probably the one to be most watched out for will be the first development flight of GSLV-MK III. The vehicle will launch GSAT-19E, a communication satellite weighing around 3200 kgs. Liftoff can be expected in March.

The third launch to keep an eye on will be the launch of GSAT-9 satellite onboard GSLV-MK II. Weighing around 2195 kgs, the satellite will have a power generation capacity of 3000 watts and is expected to give 12 years of service.

Other than these there are several small missions planned for the year ahead.

In the image attached below, GSLV MK-III can be seen integrated with CARE at second launch pad SHAR, a day prior to LVM-3/CARE mission.

Image Courtesy : ISRO