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Indian Space Programme Discussion - Sept 2016

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Picklu
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Re: Indian Space Programme Discussion - Sept 2016

Postby Picklu » 16 Apr 2018 00:54

SriKumar wrote:If this thing does not get sorted out in an year or so, perhaps one could consider launching a 'relay communication' satellite with a GSLV launch (in addition to the scheduled payload). This 'relay comm' satellite should be brought to the same orbit and in proximity to the disabled satellite to establish communication. (alternatively, a pre-scheduled payload going via the same intermediate orbit could be programmed to do some relay communication functions in the orbit of the disabled satellite before it goes on to its final orbit).

At a minimum, it can send pictures of the orientation of the GSAT6 satellite and determine how the satellite is spinning/antenna is oriented w.r.t time etc. Once the spin rate/antenna attitude is known, the relay satellite could be positioned to transmit a signal. All of the above applies if it is 'only' a matter of getting a signal into the disabled satellite, which per public domain information is the problem. (If there are other issues, then I dont know). It is not clear what has caused the (i) power loss, and (ii) communication loss (loss of earth lock obviously). The solar panel is deployed, so it does have power from an active power source. Some circuit issue perhaps.



The CT theorist in me speculates that we have just launched the business case for our own space docking/capturing experiment

kit
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Re: Indian Space Programme Discussion - Sept 2016

Postby kit » 16 Apr 2018 03:55

It would be a great experiment if we could turn this problem into an opportunity .. send off an "engineer satellite" to fix the problem :mrgreen:

prasannasimha
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Re: Indian Space Programme Discussion - Sept 2016

Postby prasannasimha » 18 Apr 2018 19:32

Apr 15, 2018 : The fourth and the final orbit raising operation of IRNSS-1I is successfully carried out at 21:05 hr IST on April 15, 2018. The achieved perigee height is 35,462.9 km and apogee height is 35,737.8 km

chetak
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Re: Indian Space Programme Discussion - Sept 2016

Postby chetak » 19 Apr 2018 18:22

Picklu wrote:
SriKumar wrote:If this thing does not get sorted out in an year or so, perhaps one could consider launching a 'relay communication' satellite with a GSLV launch (in addition to the scheduled payload). This 'relay comm' satellite should be brought to the same orbit and in proximity to the disabled satellite to establish communication. (alternatively, a pre-scheduled payload going via the same intermediate orbit could be programmed to do some relay communication functions in the orbit of the disabled satellite before it goes on to its final orbit).

At a minimum, it can send pictures of the orientation of the GSAT6 satellite and determine how the satellite is spinning/antenna is oriented w.r.t time etc. Once the spin rate/antenna attitude is known, the relay satellite could be positioned to transmit a signal. All of the above applies if it is 'only' a matter of getting a signal into the disabled satellite, which per public domain information is the problem. (If there are other issues, then I dont know). It is not clear what has caused the (i) power loss, and (ii) communication loss (loss of earth lock obviously). The solar panel is deployed, so it does have power from an active power source. Some circuit issue perhaps.



The CT theorist in me speculates that we have just launched the business case for our own space docking/capturing experiment


I gathered that thermal management is also an issue that has started to bother ISRO. If the temps rise/drop below the specified values it could make the difference between recovery and loss.

They are unable to get a read on this aspect, in addition to all the other issues.

Indranil
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Re: Indian Space Programme Discussion - Sept 2016

Postby Indranil » 19 Apr 2018 18:44

My theory is that once they can get any kind of signal going, they will first try to slow the rotation using onboard motors.

Vips
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Re: Indian Space Programme Discussion - Sept 2016

Postby Vips » 23 Apr 2018 07:56

Isro to launch slew of military satellites soon.

Amid preparations for its high-profile Rs 800 crore Chandrayaan-2 mission scheduled for an October launch, Indian Space Research Organisation (Isro) is also gearing up to launch a slew of important satellites in the coming months.

Some of these satellites are significant for strategic reasons as they will help the military keep an eye on our hostile neighbours and safeguard our land and sea borders.

Isro will launch a dedicated satellite, Gsat-7A, for the Indian Air Force (IAF) in September and an advanced remote sensing satellite, Risat-2A, for surveillance purpose by the end of the year.

Gsat-7A, which will be lifted by a GSLV Mk II rocket, will enable the IAF to interlink different ground radar stations, airbases and AWACS aircraft. It will also boost the IAF’s network-centric warfare capabilities and enhance its global operations.

The satellite will be similar to Gsat-7 or Rukmini, which was launched on September 29, 2013, exclusively for the Navy. Rukmini has helped the Navy monitor the Indian Ocean Region (IOR) as the satellite has a nearly 2,000 nautical mile ‘footprint’ and provides real-time inputs to Indian warships, submarines and maritime aircraft and also boosts the force’s networking capabilities on the high seas. Rukmini, considered the Navy’s ‘eye in the sky’, is also being used to keep tabs on Chinese warships in the Indian Ocean.

Risat-2A, which will be launched by the end of this year by a PSLV rocket, is an advanced remote sensing satellite that will boost the country’s surveillance capabilities. The satellite, which will carry a sophisticated synthetic aperture radar that operates at 5.35 GHz in C band, will help in earth observation irrespective of the light and weather conditions of the area.

Risat-2A, which can be used for civilian purpose, will primarily be used for land mapping but will also be significant for analysis of the ocean surface. Risat-2A will be the third in the series of Risat satellites.

After the 26/11 terror attacks in Mumbai in 2008, Risat-2 satellite took priority over Risat-1 and was launched in April 2009 as the former carried an Israelbuilt X-band radar, which boosted surveillance capabilities of the security forces.

Cartosat-2 series satellite, launched on January 12, is also a remote sensing satellite and significant for the military too as its panchromatic camera can produce images less than 1 metre in resolution. In fact, it is said that the Army used images from the earlier Cartosat satellite to plan the surgical strikes on Pakistan terror launchpads in September 2016.

Besides the military satellites, Isro will also launch its “heaviest satellite ever” Gsat-11 weighing 5.7 tonnes from French Guiana by June. The heavy-duty communication satellite is so massive that each solar panel is over four metres long, equivalent to the size of a room. The high-throughput satellite, which will carry 40 transponders in the Ku-band and Kaband frequencies, is capable of “providing high bandwidth connectivity” with up to 14 gigabit per second (gbps) data transfer speed.

Gsat-29, which too is a communication satellite, will be the launched by the second developmental flight of Isro’s heaviest rocket GSLV Mk III in June. It will carry multi-beam and optical communication payloads.

Isro chairman Dr K Sivan told TOI, “Together, all these heavy-duty Gsats will provide high-bandwidth connectivity of up to 100 gigabit per second. They will provide high-speed internet connectivity in rural areas as well and help bridge the digital divide.”

With almost one launch every month, 2018 will be a busy year for Isro.

Hiten
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Re: Indian Space Programme Discussion - Sept 2016

Postby Hiten » 24 Apr 2018 15:55

an exploded view of the Bhaskara 1 satellite - India's 1st Earth Observation satellite & its second ever satellite, launched in 1979

Image

unconfirmed report says GSAT-11 launch postponed. Satellite returns back to India. Entire mission scrubbed

https://www.spaceintelreport.com/last-m ... cancelled/

JTull
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Re: Indian Space Programme Discussion - Sept 2016

Postby JTull » 24 Apr 2018 18:59

Hope ISRO clarifies soon on this GSAT-11 news.


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