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Indian Space Programme Discussion - Sept 2016

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Picklu
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Joined: 25 Feb 2004 12:31

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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Posts: 2341
Joined: 13 Jul 2006 18:16

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
Forum Moderator
Posts: 6458
Joined: 02 Apr 2010 01:21

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.


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