Author Topic: GSLV-F04 launch with INSAT-4CR  (Read 40937 times)

Offline Satori

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GSLV-F04 launch with INSAT-4CR
« on: 08/28/2007 11:02 am »
The GSLV-F04 poster and the INSAT-4CR poster from ISRO!

Offline William Graham

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #1 on: 08/28/2007 10:20 pm »
There are reports that bad weather may delay the launch.

Offline sammie

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #2 on: 08/29/2007 10:11 am »
link

Net date is 2 september, "due to the prevailing weather conditions in Sriharikota, which had been experiencing rains for the last couple of days."
"The dreams ain't broken downhere, they're just walking with a limp"

Offline Satori

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #3 on: 08/29/2007 01:32 pm »
Which launch pad is going to be used for GSLV? I haven't sure if both launch pads can be used to launch this vehicle or if the GSLV only launches from the Second Launch Pad (SLP)... Or is India only using the SLP now?

Offline Skyrocket

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #4 on: 08/29/2007 05:51 pm »
GSLV with Insat-4CR will lift off from SLP

PSLV with Polaris i would expect to use the other pad


Offline William Graham

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #5 on: 08/30/2007 10:47 am »
Is there going to be a webcast?

Offline Satori

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #6 on: 08/30/2007 11:41 pm »

Offline Satori

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #7 on: 08/30/2007 11:42 pm »
Quote
GW_Simulations - 30/8/2007  5:47 AM

Is there going to be a webcast?

Until this moment I haven't seen any indication of a webcast of this launch. But we should wait and see!

Offline anik

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RE: GSLV-F04 launch with INSAT-4CR
« Reply #8 on: 09/01/2007 10:49 am »
Launch of INSAT-4CR by Geosynchronous Satellite Launch Vehicle, GSLV-F04: Background
http://www.isro.org/pressrelease/Background-GSLV-F04.pdf

Offline isro-watch

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RE: GSLV-F04 launch with INSAT-4CR
« Reply #9 on: 09/02/2007 10:44 am »
The weather is very fine as of today...and hope GSLV will lift off within a few min from here...

GSLV can use both the launch pads...infact GSLV-D1, GSLV-D2 did take off from the first launch pad...
as of now...PSLV-C10(polaris) is using the first launch pad (FLP)...


live webcast may not be present but some private channels do carry news and webcasts instantly...a video may be available in 10-15 min at...

www.ndtv.com
www.ibnlive.com

these channels covered last two PSLV flights...i m not sure whether they will cover this "live" or not...

Offline isro-watch

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #10 on: 09/02/2007 11:20 am »
the launch has been put on hold for 50minutes...reason: not known as yet...

Offline astropl

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #11 on: 09/02/2007 11:59 am »
Quote
isro-watch - 2/9/2007  1:20 PM

the launch has been put on hold for 50minutes...reason: not known as yet...

New launch time: 6:10 pm IST = 12:40 GMT.
http://www.newindpress.com/NewsItems.asp?ID=IEL20070901233857&Page=L&Headline=Launch+of+GSLV%2DF04+postponed+to+6%2E10+pm&Title=B+R+E+A+K+I+N+G++++N+E+W+S&Topic=0
Waldemar Zwierzchlejski (astropl)
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Offline otisbow

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #12 on: 09/02/2007 01:05 pm »
Thanks for the webcast info.  I watched the launch on NDTV.

Offline isro-watch

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RE: GSLV-F04 launch with INSAT-4CR
« Reply #13 on: 09/02/2007 01:40 pm »
GSLV-F04 LAUNCHED SUCCESSFULLY...INSAT-4CR PLACED IN ORBIT...


THE LAUNCH WAS PUT ON HOLD BY THE AUTOMATIC LAUNCH RELEASE SYSTEM...AS IT DETECTED THAT THE VALVE WHICH SUPPLIES CRYOGENIC PROPELLANTS DIDN'T CLOSE...SOURCE:NDTV









Offline isro-watch

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #14 on: 09/02/2007 01:48 pm »
THE LAUNCH TOOK PLACE AT 06.20PM (IST)...THAT IS AT 12.50PM (GMT)...

THE LAUNCH WAS ON HOLD FROM 4.21PM...

I WAS WATCHING THE LIVE CAST...THE COUNTDOWN SUDDENLY STOPPED 15 SECONDS BEFORE LAUNCH...LATER THE REASON GIVEN WAS THE LAUNCH COMPUTER DIDNT DETECT A CLOSE IN THE INLET VALVE ON THE CRYOGENIC ENGINE...

Offline eeergo

Re: GSLV-F04 launch with INSAT-4CR
« Reply #15 on: 09/02/2007 03:34 pm »
Thanks for the info, much appreciated! GLSV has returned to flight successfully, that's great news.
-DaviD-

Offline Sonugn

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #16 on: 09/02/2007 03:49 pm »
GSLV launch video


Offline eeergo

Re: GSLV-F04 launch with INSAT-4CR
« Reply #17 on: 09/02/2007 09:18 pm »


Apparently, the GTO trajectory achieved after the launch had an underperformance at apogee of 786 miles (which seem quite a lot to me, isn't it?), but the satellite can reach full operational capabilities in GEO. No insight on the cause, and ISRO has declared the launch a success.
-DaviD-

Offline sammie

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #18 on: 09/02/2007 11:26 pm »
Hmm that shortfall is larger then the recent shortfall of the Atlas 5, which was subsequently deemed a failure. Inded would be interesting to know what caused the shortfall
"The dreams ain't broken downhere, they're just walking with a limp"

Offline edkyle99

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #19 on: 09/03/2007 03:40 am »
Quote
sammie - 2/9/2007  6:26 PM

Hmm that shortfall is larger then the recent shortfall of the Atlas 5, which was subsequently deemed a failure. Inded would be interesting to know what caused the shortfall

The GSLV-F04 shortfall is larger in terms of kilometers, but it does not appear to be more in terms of delta-V, the real measure of performance.  The GSLV shortfall was evident in a slight apogee shortfall, on a percentage basis, on a highly elliptical orbit, but the Atlas V AV-009 shortfall created a greater percentage low perigee on a slightly elliptical orbit.  

As near as I can tell, the GSLV-F04 shortfall is in the neighborhood of 20-ish meters per second (not including the inclination difference, which would actually be a benefit in this case that would reduce the shortfall) while the Atlas V AV-009 shortfall was somewhere in the realm of roughly 40 meters per second (with a lot of uncertainty on this number due to the classified nature of the mission).  

Also note that the GSLV shortfall is against a total mission delta-V that is probably in the 11,500 meters per second range, while the AV-009 shortfall was against something like only 9,300 meters per second.

The other difference here is that while ISRO has claimed success, the U.S. Air Force itself said that AV-009 was not completely successful.

Interestingly, the very first GSLV flight in 2001 suffered a 70-ish meters per second shortfall that stranded G-Sat 1 in a 23 hour orbit, since G-Sat 1 could not make up the difference.  ISRO still calls that flight successful, but I consider it a failure.

 - Ed Kyle

Offline jacqmans

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RE: GSLV-F04 launch with INSAT-4CR
« Reply #20 on: 09/03/2007 08:58 am »
GSLV-F04 Launch Successful - Places INSAT-4CR in Orbit
September 2, 2007  
 
   
 India's Geosynchronous Satellite Launch Vehicle, GSLV-F04, had a successful launch today (September 2, 2007) at 18.20 hours from Satish Dhawan Space Centre SHAR (SDSC SHAR), Sriharikota and it placed India’s INSAT-4CR into the Geosynchronous Transfer Orbit (GTO). This was the fifth flight of GSLV and the fourth successful one.  

INSAT-4CR is now orbiting the Earth in GTO with a perigee (nearest point to Earth) of 168 km and an apogee (farthest point to Earth) of 34,710 km with an orbital inclination of 20.7 deg with respect to the equator.

At 4.8 seconds before count down reached zero, the four liquid propellant strap-on stages, each carrying 40 tonne of liquid propellants, were ignited. At count zero and after confirming normal performance of all the four strap-on motors, the 138 tonne solid propellant core stage was ignited and the 414 tonne, 49 m tall GSLV blazed into the sky. The important flight phases included the first stage and strap-on stage propulsion, payload fairing separation at an altitude of 115 km, the second stage propulsion and the cryogenic stage propulsion. The cryogenic propulsion stage was shut down after attaining the required velocity of 10.2 km per second. The 2,140 kg INSAT-4CR was placed in orbit about seventeen minutes after lift off, about 5,000 km away from Sriharikota.

GSLV was commissioned after both its developmental test flights conducted in April 2001 and May 2003 were successful. In its first operational flight on September 20, 2004, GSLV launched the 1,950 kg EDUSAT into GTO. However, the second operational flight, GSLV-F02, with INSAT-4C on board, conducted on July 10, 2006, did not succeed. The Failure Analysis Committee (FAC), constituted to review the reasons for the failure, concluded that the primary cause for the failure was the sudden loss of thrust in one of the four liquid propellant strap-on motors (S4) immediately after lift-off resulting from the malfunctioning of a propellant regulator. FAC also concluded that the design of GSLV is robust and recommended implementation of stricter control on fabrication, inspection and acceptance procedures. The recommendations of FAC had been implemented in GSLV-F04.

GSLV was designed and developed by Vikram Sarabhai Space Centre, Thiruvananthapuram. The inertial systems for the vehicle were developed by the ISRO Inertial Systems Unit (IISU) at Thiruvananthapuram. The Liquid Propulsion Systems Centre (LPSC) also at Thiruvananthapuram developed the Liquid propulsion stages for the strap-ons and the second stage of GSLV as well as the reaction control systems. While the Russian supplied cryogenic stage is used for third stage propulsion, the guidance and control of the stage has been implemented by ISRO. Satish Dhawan Space Centre SHAR is the launch centre for all the launch vehicles of ISRO. ISRO Telemetry, Tracking and Command network (ISTRAC) provides Telemetry, Tracking and Command support.

INSAT-4CR Solar Array Deployed

INSAT-4CR is the third satellite in INSAT-4 series. It carries 12 high-power Ku-band transponders designed to provide Direct-To-home (DTH) television services, Video Picture Transmission (VPT) and Digital Satellite News Gathering (DSNG). It was built to replace an identical satellite, INSAT-4C that was lost due to the failure of GSLV-F02 in July 2006.

Soon after its injection into to GTO, the two solar arrays of INSAT-4CR were automatically deployed. The deployment of the arrays as well as the general health of the satellite were monitored by the ground station of the ISTRAC located in the Indonesian island of Biak. The Master Control Facility (MCF) at Hassan in Karnataka has since taken control of INSAT-4CR for all its post launch operations. Ground stations at Lake Cowichan (Canada), Fucino (Italy) and Beijing (China) are supporting MCF in monitoring the health of the satellite and its orbit raising operations.

In the coming days, INSAT-4CR’s orbit will be raised from its present elliptical GTO to the final Geostationary Orbit (GSO) by firing the satellite’s Liquid Apogee Motor (LAM) in stages. The satellite will be commissioned into service after the completion of orbit raising operations, checking out all its transponders and positioning it in its designated orbital slot of 74 degree East longitude in the GSO. There, it will be co-located with KALPANA-1, INSAT-3C and EDUSAT.

INSAT-4CR was developed by ISRO Satellite Centre, Bangalore. The payloads were developed by Space Applications Centre, Ahmedabad. Master Control Facility at Hassan is responsible for all post launch operations of the satellite.

The successful launch of GSLV-F04 today has demonstrated the operational reliability of GSLV as well as reiterated the end-to-end capability of ISRO to not only build state-of-the-art communication satellites, but also to launch them using the indigenously designed and built launch vehicle.

Photo's:

http://www.isro.org/gslv-f04/photos/index.htm

Jacques :-)

Offline anik

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RE: GSLV-F04 launch with INSAT-4CR
« Reply #21 on: 09/03/2007 03:23 pm »
INSAT-4CR First Orbit Raising Operation Carried Out
September 3, 2007

http://www.isro.org/pressrelease/Sep03_2007.htm

"The first orbit raising manoeuvre of ISRO's latest satellite, INSAT-4CR, was successfully carried out by firing the 440 Newton Liquid Apogee Motor on board the satellite for a duration of 27 minutes starting at 08:17 IST today (September 3, 2007) by commanding the satellite from Master Control Facility (MCF) at Hassan in Karnataka. With this operation, the perigee (nearest point to earth) of INSAT-4CR has been raised to 2983 km and apogee, the farthest point to earth to 31,702 km. The inclination of the orbit with respect to the equatorial plane has been reduced to 11.1 deg.

All systems on board the satellite are functioning normally"

Offline jcm

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #22 on: 09/03/2007 04:10 pm »
Quote
edkyle99 - 2/9/2007  11:40 PM

Quote
sammie - 2/9/2007  6:26 PM

Hmm that shortfall is larger then the recent shortfall of the Atlas 5, which was subsequently deemed a failure. Inded would be interesting to know what caused the shortfall

The GSLV-F04 shortfall is larger in terms of kilometers, but it does not appear to be more in terms of delta-V,

 - Ed Kyle


Interestingly, US tracking seems to indicate a rather larger shortfall than the ISRO announcement.
The tracked orbit was 168 x 31786 km x 15.8 deg, not 168 x 34710 x 20.7 deg.  (Compare a standard GTO
orbit of 150-200 x 35800 km). This discrepancy is larger than
the scatter in different agencies' definitions of apogee and perigee., and the inclination is completely off.
The new ISRO press release quoting a 31702 km apogee AFTER the first orbit raising burn tends to support the idea that the initial announcement was overoptimistic.

Since this is an experimental cryogenic stage (there was some talk about the first Indian built one going on the fifth flight, but they were still doing static testing last month and the ISRO releases imply that this is the Russian stage, albeit with Indian guidance systems) I imagine that the Indians are fairly happy that it is that close, I don't think they are really at the point of trying for the precision injections we expect from commercial US/Russian/Euro vehicles. Definitely a better result than the last GSLV!

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Offline edkyle99

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #23 on: 09/03/2007 05:06 pm »
Quote
jcm - 3/9/2007  11:10 AM

Interestingly, US tracking seems to indicate a rather larger shortfall than the ISRO announcement.
The tracked orbit was 168 x 31786 km x 15.8 deg, not 168 x 34710 x 20.7 deg.  (Compare a standard GTO
orbit of 150-200 x 35800 km). This discrepancy is larger than
the scatter in different agencies' definitions of apogee and perigee., and the inclination is completely off.
The new ISRO press release quoting a 31702 km apogee AFTER the first orbit raising burn tends to support the idea that the initial announcement was overoptimistic.

At roughly 75 meters per second, this appears to be a bigger shortfall than the initial GSLV launch that I consider to be a failure - but in that instance the R&D payload was unable to propel itself into the planned operational orbit.  INSAT-4CR will probably be able to make up the difference in this case, but at what cost to the planned 10-year orbital lifetime?  My guess would be that this would cost the satellite 8-10 months of on-orbit station keeping propellant, but then again INSAT may have enough propellant margin to still make 10 years, barring any other problems.  

How would the insurance industry rate this one?

And yes, this GSLV-F04 mission now appears to have produced a bigger shortfall than Atlas V AV-009, in terms of absolute delta-V numbers.

 - Ed Kyle

Offline Bob_The_Builder

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #24 on: 09/03/2007 09:32 pm »
I think There can be these issues, The sat carries 1190 kg of onboard fuel.

1. The initial press release by ISRO is correct and orbit is now raised to the required one and the latest press release has a typo.
2. The latest press release by ISRO is correct and the initial data was wrong.
3. Interestingly this GSLV carries a completely new guidance system and avionics system based on Linux I think (IIRC) , uses a home made Microprocessor as well, so Can there be any issue due to the new first test of this avionics system? This system was tested before in the previous PSLV as a payload.

If one watches the video at the end of first stage the velocity was 2.3km/sec instead of 2.8km/sec. The first stage core is expended much before the strap on booster stages are expended, and the first stage is not fully autonomous. It is possible that the strap on were switched off sooner because of some constrain or error. So the second stage started off with an initial velocity handicap that showed up ultimately in final orbit. The First stage cut off aound 2.3 KM/Sec (thought at correct altitude of 70 KM) and second stage cut off at 4.9 KM/Sec instead of 5.4 KM / Sec - overall, there is a deficiency of 0.5 KM/ Sec at the start of 3rd stage ignition. This deficiency continued till the injection of the satellite.

By the way there was a telemetry cut off,  The commentator announced that 30 secs were left for cutoff and then, at 920 seconds the telemetry display froze for over 80 seconds during which the 3rd stage burnout should have occurred. The commentator did not know what was happening until the display restarted at 1006 seconds - during which time the 3rd stage had cut off.

BTW a local newspaper carried a report that on the reason of delay was, 'Fuel got frozen in one of the valves. This was immediately identified and efforts were made to rectify it but didnt succeed. It was only after a brave attempt by some of the technicians who went there and heated the valve manually, the launch was given a go ahead'.

My bets are on the second press release having a Typo, Lets see I'll mail ISRO and ask them about it , It should read 35712 instead of 31712.


Offline Bob_The_Builder

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #25 on: 09/03/2007 09:40 pm »
http://www.hindu.com/2007/09/03/stories/2007090358010100.htm

Quote
The were other heartbreaking moments. There were signal drop-outs from the tracking stations at Brunei and Biak in Indonesia, and the ISRO lost track of the vehicle. This happened on and off for three and a half minutes

Also how can the orbit be reduced to 11.1 degrees in the last press release? the requirement was itself 21.7 degrees ?

Offline Bob_The_Builder

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #26 on: 09/03/2007 10:30 pm »
My previous observation may be incorrect on the velocity at start of 3rd stage, on velocity loss as the vehicle has got the desired altitude in the same velocity?
Here is a article that attributes the issue to cryogenic stage,


Quote
First manoeuvre to raise satellite’s orbit
http://www.hindu.com/2007/09/04/stories/2007090455371000.htm

NO copying and pasting, it's called COPYRIGHT! - James Lowe.


Offline edkyle99

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #27 on: 09/03/2007 11:09 pm »
Quote
Bob_The_Builder - 3/9/2007  4:40 PM

http://www.hindu.com/2007/09/03/stories/2007090358010100.htm

Quote
The were other heartbreaking moments. There were signal drop-outs from the tracking stations at Brunei and Biak in Indonesia, and the ISRO lost track of the vehicle. This happened on and off for three and a half minutes

Also how can the orbit be reduced to 11.1 degrees in the last press release? the requirement was itself 21.7 degrees ?

This is normal.  The apogee burns would be vectored to also decrease the inclination, which ultimately will be close to zero degrees.

 - Ed Kyle


Offline Bob_The_Builder

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #28 on: 09/04/2007 12:51 am »
OK I looked at the first video when they show the GSLV performance during first 60 seconds, and it confirm that the speed being shown is relative velocity w.r.t. earth and is NOT the absolute inertial speed. The difference being 0.4km/sec due to speed of earth's rotation about its axis.

Thus the final speed shown in the video is 9.7km/sec (equal to inertial frame 10.1km/sec) at T+1041 second (quite a while after engine cutoff) indeed very close to desired final inertial speed of 10.2Km/Sec. Based on this I agree with ISRO report stating the launch was successful and apogee is short of ideal target by ~1,300Km.

Earlier calculations indicates that 1,300km delta will be corrected by 15Kg of the available 1190 Kg fuel in the INSAT.

BTW speed delta of 0.5 km/sec is grossly incompatible with reported orbit of >30,000Km.

Offline miom70

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #29 on: 09/04/2007 09:49 am »
http://www.hindu.com/2007/09/04/stories/2007090460841000.htm

"Informed ISRO officials said the apogee achieved was lower than the targeted one. This could be due to the underperformance of the third, uppermost cryogenic stage of the GSLV-F04. “

Offline edkyle99

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #30 on: 09/04/2007 02:48 pm »
Quote
miom70 - 4/9/2007  4:49 AM

http://www.hindu.com/2007/09/04/stories/2007090460841000.htm

"Informed ISRO officials said the apogee achieved was lower than the targeted one. This could be due to the underperformance of the third, uppermost cryogenic stage of the GSLV-F04. “

If true, this appears to have been a repeat of the inaugural GSLV-D1 launch, which has been described as a failure, or "partial failure".  See, for example, the following link.

http://www.sat-index.com/launchfailures/2001-04-18.html

The GSLV-F04 launch appears to have missed the mark even more than GSLV-D1, which supports the assertion that some type of launch vehicle failure has occurred.

 - Ed Kyle


Offline isro-watch

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #31 on: 09/04/2007 03:01 pm »
hi all, looks like the discussion is very technical...


ISRO officials here say that the satellite carries enough propellants and thay will be using it to raise the orbit at the cost of loss in satellite lifespan...the lifespan of INSAT-4CR is 11years....and it may reduce to 8 or 9....

i dont think there's a problem...even during the first launch ,a similar problem arose and it was almost corrected although there was about deficiency of some proppellant to carry out final orbit raising...

Offline isro-watch

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #32 on: 09/04/2007 03:07 pm »
ISRO attributes the loss to russian supplied cryoengine...
only GSLV-F03 will use russian engine...all others may use indian built engines only...

Offline pippin

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #33 on: 09/04/2007 03:30 pm »
Oh yes. India has a way better track record for cryo engines than Russia ;-)

Offline edkyle99

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #34 on: 09/04/2007 04:01 pm »
Quote
isro-watch - 4/9/2007  10:07 AM

ISRO attributes the loss to russian supplied cryoengine...
only GSLV-F03 will use russian engine...all others may use indian built engines only...

I'm not sure how an engine problem could explain the big divergence from the planned inclination.  That sounds more like a guidance or flight control issue.  In order to get to a lower inclination, the vehicle (probably the upper stage) had to have provided some unplanned off-azimuth thrusting.

 - Ed Kyle

Offline isro-watch

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #35 on: 09/05/2007 11:44 am »
http://www.isro.org/pressrelease/Sep05_2007.htm


looks like...the final orbit is not that far...:)

Offline Satori

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #36 on: 09/05/2007 12:14 pm »
The photo gallery has been updated with new photos of the GSLV-F04 launch!

Offline wannamoonbase

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #37 on: 09/08/2007 03:21 am »
Congratulations to India.  Its great to see another country having success in getting things into space.  I have great faith in India and their engineers to be very successful going forward.  I think that over the next 10 years the launch industry will be changing greatly.
Wildly optimistic prediction, Superheavy recovery on IFT-4 or IFT-5

Offline isro-watch

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #38 on: 09/09/2007 05:43 am »
INSAT-4CR PLACED IN NEAR GEO-SYNCRONOUS ORBIT....


http://www.hindu.com/thehindu/holnus/008200709081821.htm

Offline lnb15k

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #39 on: 10/17/2007 01:09 pm »
I think it is yet to stay in perfect orbit as per Real time Satellite tracking website.
What you all say?

Offline Satori

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #40 on: 10/17/2007 08:57 pm »
Quote
lnb15k - 17/10/2007  8:09 AM

I think it is yet to stay in perfect orbit as per Real time Satellite tracking website.
What you all say?

I haven't heard anything about it, but let's see if anything comes to light.

Offline s^3

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #41 on: 10/18/2007 05:28 am »
Quote
lnb15k - 17/10/2007  8:09 PM

I think it is yet to stay in perfect orbit as per Real time Satellite tracking website.
What you all say?

As far as orbit is concerned it seems to be in perfect stage.

Calculation of maximum and minimum values of AZ, EL and S/C height  over a period of 10 days and over 1 day  using the latest State Vectors from Space Trak  shows that the satellite is stable. [ Groundstation location used is about 17deg N. in India ]

 Table 1. Variation over 10 days ( 8OCT07 to 17OCT07)

                 AZ              EL                Height above MSL
MAX        194.39   69.55           35801.6
MIN         193.76   69.35           35770.4
Variation:    0.63     0.2                31.2

Table 2. Variation over a day ( 17OCT07)

                  AZ              EL             Height above MSL
MAX        193.97   69.55      35801.6
MIN         193.76   69.38      35770.7
Variation:    0.21   0.17      30.9

We can't say anything about its communications performance.

==============
S^3

Offline lnb15k

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #42 on: 10/18/2007 11:42 am »
Thanks Satori & S^3 for the detailed information.

Offline edkyle99

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #43 on: 10/18/2007 02:21 pm »
The key measure is the orbital period, which should match the Earth's sidereal rotation period (1,436.07 minutes) when a geosynchronous orbit has been achieved.  INSAT 4CR appears to be right on top of that value.  Its slightly imperfect orbit, which is not unusual for a newly-orbited GEO comsat, will no doubt continue to be tweaked during its operational lifetime toward the ideal of 35,786 km x 0.0 deg.

 - Ed Kyle

Offline lnb15k

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #44 on: 10/19/2007 06:57 am »
Thanks Kyle. What is that Declination means? For example it is saying -3 18' 12"  It also says Right Ascension at 13:08:05 hrs But speed KM/S is 0 (zero) Then how?

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #45 on: 10/19/2007 11:47 am »
Hello Inb15k

I don't know what data you are having in mind.

Present orbital elements show following:

Inclination : .0622 dg ( V.Good value )
Eccentricity : .0003655 ( Which basically talks of the circularness of orbit )
RA            : 259.3533  ( This is eqator crossing position .. called ascending node .. from Greenwhich )

This data is for 48th orbit.

Anupama Upadhyay

Offline lnb15k

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #46 on: 10/19/2007 12:58 pm »
Thanks Anupama. --tp://n2yo.com/?s=32050 this was that site. Actually I don't know much like you people here. Sorry for posting silly questions.

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #47 on: 10/19/2007 05:00 pm »
Welcome to this forum Inb15k.

I don't think you asked silly questions. It was genuine query based on  the data found at n2yo  where it might not have been updated.

Thanks annu for the good and detailed info generated from TLEs.

========
S^3

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #48 on: 10/20/2007 08:33 am »
Thanks S^3. My ID is Lnb15k :)

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #49 on: 10/20/2007 12:34 pm »
Oh! Oh!!

OK, will take care in future.  We know LNB as a Low Noise Block Converter used in Satellite data reception :) .

Offline edkyle99

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #50 on: 12/15/2007 03:17 pm »
Quote
lnb15k - 17/10/2007  8:09 AM

I think it is yet to stay in perfect orbit as per Real time Satellite tracking website.
What you all say?

This post takes on new meaning in light of the following interesting report.  Apparently ISRO "lost" Insat 4CR for awhile, at a cost of 5 years of on-orbit life!

http://www.dnaindia.com/report.asp?newsid=1139429

I wonder if ISRO ever really knew where Insat 4CR was.  As you may recall, there was a Delta-V shortfall during this launch that ISRO initially did not acknowledge.

In fact, ISRO does not appear to still acknowledge any problems with this mission.  If these problem reports are correct, and who knows for sure in light of some other recently denied reports that originated in India's press, then ISRO should own up to them.  It is very poor form for a launch service provider that wants to compete in the global launch market to obfuscate.

 - Ed Kyle

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #51 on: 12/15/2007 05:06 pm »
Anupama gave values regarding this satellite in October. Satellite would have gone missing only after 20/10/07 if we go by this report.

Offline edkyle99

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #52 on: 12/15/2007 09:23 pm »
Quote
lnb15k - 15/12/2007  12:06 PM

Anupama gave values regarding this satellite in October. Satellite would have gone missing only after 20/10/07 if we go by this report.

My reading of the story indicates that ISRO lost track of Insat 4CR in early October.  The story says it happened "almost a month" after September 7, and "about a month" after its September 2 launch.

Perhaps you detected the problem prior to your original post!

 - Ed Kyle


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Re: GSLV-F04 launch with INSAT-4CR
« Reply #53 on: 12/20/2007 04:00 am »
ISRO acknowledged low apogee problem on Sept 8th.

http://www.hindu.com/thehindu/holnus/008200709081821.htm

"On Sunday evening, Geosynchronous Satellite Launch Vehicle GSLV-F04 lifted off from the spaceport at Sriharikota in Andhra Pradesh at 6.20 p.m. and placed the satellite in an elliptical, geosynchronous transfer orbit with a perigee of 168 km and an apogee of more than 30,000 km.

This was lower than the targeted geosynchronous transfer orbit with a perigee of 170 km and an apogee of about 36,000 km."

Use of onboard fuel was expected to reduce the S/C life to 8-9 yrs instead of 11 yrs.

My computations posted on 18th Oct indicate that the S/C was in a geosynchronous location OVER INDIA at least from 8th Oct to 17th Oct. ( SVs/TLEs prior to 8th were not available hence started computaion from 8th  and anyway a substantial time was required for the S/C to 'drift' to its assigned position after launch, and this drift was through space over USA ) and perhaps that 'sighting' would have been correlated as

"however, “spotted” again with the help of the US-based National Aeronautics & Space Administration (Nasa)  "   in http://www.dnaindia.com/report.asp?newsid=1139429 .

There is no way that a satellite ( after 20th Oct 2007 )  in geosynchronous orbit will travel to US without being detected and reported. Incidentally, I had to point a couple of antennas to 4CR in Nov and Dec for qualifying those antennas and the S/C was in healthy condition.

Annu has also posted on 19th Oct that the s/c is in a stable Geosyn orbit.

Perhaps some misinterpretation of news items created the DNA report.

========
S^3

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #54 on: 12/20/2007 04:39 am »
Small reformatting in a part of earlier post :

My computations posted on 18th Oct indicate that the S/C was in a geosynchronous location OVER INDIA at least from 8th Oct to 17th Oct. ( SVs/TLEs prior to 8th were not available hence started computaion from 8th. )

A substantial time ( Sept to Oct beginning )  was required for the S/C to 'drift' to its assigned position after launch, and this drift was through space over USA  and perhaps a  'sighting' in that period would have been mis-interpreted as

"however, “spotted” again with the help of the US-based National Aeronautics & Space Administration (Nasa)  "   in    http://www.dnaindia.com/report.asp?newsid=1139429 .

There is no way that a satellite ( after 20th Oct 2007 )  in geosynchronous orbit will travel to US without being detected and reported. Incidentally, I had to point a couple of antennas to 4CR in Nov and Dec for qualifying those antennas and the S/C was in healthy condition.

Offline isro-watch

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #55 on: 12/20/2007 12:55 pm »
let me answer this question...though i cannot quote any net souces...i was told by a souce in SDSC-shar...that ISRO lost track of the satellite just the next day of the launch...and it was recovered using NASA s debris management system...the satellite was out of contact for a few hours...the DNA news report came days after the incident happened and that too exaggerated it...

the satellite was intended for 11years but may be useful only for  8-9 years...as fuel was lost in orbit-correction....5years is a exaggeration...

regards
isro-watch

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #56 on: 02/10/2011 07:41 am »
The GSLV 3rd stage re-entered on February 7, 2011 at 2123UTC near the Northern border between Mozambique and Zimbabwe

Offline seshagirib

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #57 on: 02/11/2011 02:54 am »
The GSLV 3rd stage re-entered on February 7, 2011 at 2123UTC near the Northern border between Mozambique and Zimbabwe

Must be a substantial piece of hardware, is this a controlled reentry?
astronaut on space ship earth

Offline input~2

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #58 on: 02/11/2011 08:14 am »
is this a controlled reentry?
No, AFAIK

Offline chetan_chpd

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #59 on: 02/05/2019 05:51 am »
News update: Upcoming GSAT-31 to replace dying INSAT-4CR

(https://www.chetansindiaspaceflight.com/2019/02/news-update-upcoming-gsat-31-to-replace.html)

INSAT-4 constellation included seven communication satellites. INSAT-4C of this lot was lost when GSLV rocket carrying it was destroyed upon failure in year 2006. It's replacement INSAT-4CR also suffered failure to reach designed orbit when another GSLV under-performed in 2007. 4CR had to spend more fuel (reserved for orbit raising & station keeping) to reach that orbit. Since less on board fuel left for itself, the service life of 4CR got shortened by 5 years. Now the time has come for GSAT-31 to take handover from INSAT-4CR (7th FEB 2019).

Offline TheVarun

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #60 on: 02/05/2019 06:59 pm »
 How adversely affected was Insat 4CR in terms of its lifespan, by the off target injection in Sept 2007?  It has lasted more than 11 years, and functioned very well. Had there been a flawless GTO placement, how much longer would the satellite go on?  It's also interesting that while Wikipedia and some other sources call the mission a 'partial' failure( due solely to the inaccurate initial injection)  ISRO itself considers the whole thing a success. 

Offline K210

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Re: GSLV-F04 launch with INSAT-4CR
« Reply #61 on: 02/28/2019 10:57 pm »
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