Search found 581 matches

by SSSalvi
16 Apr 2019 22:49
Forum: Military Issues & History Forum
Topic: Indian ASAT Test
Replies: 854
Views: 93423

Re: Indian ASAT Test

Each fragment has it's own apogee/perigee depending on it's orbit. I can draw each orbit but it causes a clutter in image. 95% have perigee of about 250 kms. 5 or 6 orbits have apogee of 1500 plus kms. Rest are mostly between 300 and 500 apogee. Will give a table of statistics in a day or two. Or re...
by SSSalvi
16 Apr 2019 12:43
Forum: Military Issues & History Forum
Topic: Indian ASAT Test
Replies: 854
Views: 93423

Re: Indian ASAT Test

Addition to my earlier post. Actually there are 200+ more small debris pieces are there besides the 70 mentioned above. But they are not cataloged because of their small size. The 70 pieces are shown in these images. ( Solid line and a big white dot is the position and orbit of undisturbed Satellite...
by SSSalvi
16 Apr 2019 09:48
Forum: Military Issues & History Forum
Topic: Indian ASAT Test
Replies: 854
Views: 93423

Re: Indian ASAT Test

As on date some 70 fragments are still seen.
by SSSalvi
14 Apr 2019 16:18
Forum: Military Issues & History Forum
Topic: Indian ASAT Test
Replies: 854
Views: 93423

Re: Indian ASAT Test

Interesting. https://twitter.com/Marco_Langbroek/status/1116147781444546561 Marco Langboek has got it completely wrong. His last reference is a IR photo of the target satellite taken from ASAT which is at a distance of 0.84 Km. That is 840 meters. All it requires (I think, thumb rule) is 0.03 degre...
by SSSalvi
29 Mar 2019 18:15
Forum: Military Issues & History Forum
Topic: Indian ASAT Test
Replies: 854
Views: 93423

Re: Indian ASAT Test

Purely from Technical point of view: 1. From : https://english.manoramaonline.com/news/nation/2019/03/27/mission-shakti-drdo-asat-missile-hit-microsat-r-isro.html - There were no war heads ,, so (My feeling : No big Shattering to create a large cloud of Debris ) - Microsat-R was the satellite that w...
by SSSalvi
10 Oct 2017 21:53
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

Even GSLV Mk III-D1/GSAT-19 mission brochure did not ever mention about a 3D printed antenna. But it does seem to have one. https://www.facebook.com/indianspaceinvestigators/posts/403893833359396 ( Careful .. no references given .. only reproduction of contents ) BTW this seems to be a test antenna ...
by SSSalvi
08 Aug 2017 23:52
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

I doubt if anyone here has interest in the subject of Remote Sensing. Still posting because it pertains to ISRO. Every year ISRO's Remote Sensing wing NRSC, conducts a seminar on Remote Sensing on 11th August. This year the deliberations are being streamed ' Live ' between 1400 and 1730 Hrs http://w...
by SSSalvi
13 Jul 2017 21:03
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

Carto 2E .. Hi res separation... Oh, that dangling connector ( Right Bottom corner ) is scary.

How many small flying objects .. space is really a scary place.

by SSSalvi
12 Jul 2017 23:04
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

^^^ For satellites ( or a 'rocket' with 'intended' payload ) with an altitude of 1000 kms there is a physical restriction of visibility limit ( due to a spherical shape of Earth ) of about 3000 kms radius circle around observer ( the Ship in this case ). So the ship needs to be positioned strategica...
by SSSalvi
06 Jul 2017 21:42
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

GSAT-7 What is that orange coloured tubular structure on top? Long helix antenna or a large swath imaging camera? Surely not an Optical Instrument. http://images.financialexpress.com/2017/07/isro-gsat-7-rukmini.jpg A line in the image mentions UHF band communication capability. Could be a Helical a...
by SSSalvi
05 Jul 2017 10:28
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

Let's assume that they know their job better than we outsiders.
by SSSalvi
05 Jul 2017 09:19
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

Yes they are ( at least 10 years back they used to .. so now much better may be ). All entities you mention had much better than what we think are.. rest assured. :)
by SSSalvi
04 Jul 2017 19:37
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

what is the revisit time to the same orbital plane of our 6 cartosats and 2 risats in polar orbit? i am able to track them using nyo but not sure how to calculate it based on the satellite speed and rotation of earth Rigorously speaking ' Repetitivity ' is the time period between 2 consecutive over...
by SSSalvi
02 Jul 2017 01:53
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

I don't know .. it could have been posted earlier .. still posting a 'open heart' failure analysis disclosure http://www.frontline.in/cover-story/gslv-mkiii-the-next-milestone/article5596588.ece If you look at the PSLV’s first flight, which failed, when we did the simulation on the ground, there was...
by SSSalvi
29 Jun 2017 21:31
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

^^^
Reverse of Astronomical Star tracker.

Simply amazing results by NOT TRACKING!! :)

And a couple of Low Altitude satellites moving bottom to top as faint traces .. watch carefully .. the streaks are fainter and slightly differently patterned.
by SSSalvi
28 Jun 2017 19:17
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

The last image released must be one of the calibration image. The structure in middle ( Dark and bright squares ) is the calibration site for imaging satellites. http://www.isro.gov.in/sites/default/files/galleries/Images%20from%20Cartosat%20-2%20Series%20Satellite/imgeoscomplex-270617-62-1-13-x-stu...
by SSSalvi
28 Jun 2017 11:11
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

Right now they would not have applied all corrections .. still the resolution seems to be V good.

Compare with GE

Image
by SSSalvi
26 Jun 2017 21:37
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

^^^
13 may also include some non-ISRO sats.
by SSSalvi
16 Jun 2017 11:22
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

Sorry to say this .. How long will ISRO provide IRNSS support? Will the user shift to new system for a temporary phenomenon? Will common Indian user switch to IRNSS ( And why? ). ( Strategic usage is understandable ) What harm in using NMEA protocol? It is not a slavery .. it is convenience that you...
by SSSalvi
16 Jun 2017 10:57
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

What data does GPS give? All the hardwork of using the satellite ephemeris to compute GPS ( or antenna to be precise ) position is done by the receiver and it just provides the user needed information. GPS provides data in NMEA protocol. It Is a simple text communication protocol ( used to be the go...
by SSSalvi
12 Jun 2017 11:00
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57082

Re: GSLV-Mk III launch program/post-launch analysis

There was some reference to the place where the rocket spent stages would fall. Here is an extract from NOTAM indicating danger zones during this launch: A. DNG ZONE -1 IS A CIRCLE OF 10NM AROUND THE LAUNCHER B. DNG ZONE -2 IS A RECTANGULAR AREA BOUNDED BY: 1230N 08240E 1315N 08250E 1245N 08410E 120...
by SSSalvi
12 Jun 2017 08:34
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57082

Re: GSLV-Mk III launch program/post-launch analysis

^^^ SSO needs essentially to be inclined at 90+ degrees ( 94 to 98 deg are popular ) because the orbit plane has to precess in retrograde exactly 360 deg in order to synchronize with Sun's movement over a year. Earth imaging satellites are launched in near circular orbit because that provides a cons...
by SSSalvi
10 Jun 2017 05:29
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57082

Re: GSLV-Mk III launch program/post-launch analysis

Launch inclination is determined by the flight path .. 21.7 deg and 21.5( design value ) deg is not a big difference at all. This could have resulted due to the lower launch velocity ( about 9.8 kms/sec against 10.2 kms/sec ) attained in this flight. Orbit inclination change is inevitable in GEO lau...
by SSSalvi
08 Jun 2017 08:19
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57082

Re: GSLV-Mk III launch program/post-launch analysis

^ That is right. What we call as perigee is actually an ALTITUDE from the Earth's surface when the satellite is nearest to Earth . Now a question arises : What is meant by Earth's surface? Depending on the user - some take it as MSL ( we still use it extensively because SOI was referring to all heig...
by SSSalvi
08 Jun 2017 05:33
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57082

Re: GSLV-Mk III launch program/post-launch analysis

The brochure says that expected apogee was 35973 Kms, perigee 170 Kms & inclination 21.5 deg. Though ISRO has not yet announced the orbital parameters, which is unusual, it has been reported that attained orbit has been 163 x 34 592 km and inclination was 21.537 deg. The satellite tracking webs...
by SSSalvi
06 Jun 2017 06:07
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57082

Re: GSLV-Mk III launch program/post-launch analysis

Dekho dekho .. Core ignition dekho , Strap on seperation dekho

Amateur video from Sulurpeta ( Also read what they call it : Baahubali !!

https://youtu.be/kUgvQYZBhoU
by SSSalvi
06 Jun 2017 05:53
Forum: Trash Can Archive
Topic: GSLV-Mk III launch program/post-launch analysis
Replies: 424
Views: 57082

Re: GSLV-Mk III launch program/post-launch analysis

Image
Man nearer to camera ( taking notes ) : Satish Dhawan
by SSSalvi
05 Jun 2017 00:52
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

The ISRO graphic IS misleading.. you can't expect a man in the street to concentrate ( and interpret the vertical plane ) to understand the path.

Ok, It was my bad. Let's follow the launch.
by SSSalvi
04 Jun 2017 20:40
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

^^^SSSalvi o don't think that it is over significant land mass . If the flight footprint is taken it is all over the ocean just like previous GTO launches. The 3D rendering is just giving that impression. Tried to plot the 1st point ( 41 kms altitude ) over the sea coast and navigating globe to a s...
by SSSalvi
04 Jun 2017 10:30
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

ISRO has published details of Launch of GSLV MkIII D1 / GSAT-19 mission scheduled for Monday, June 05, 2017 at 17:28 ht IST. Flight profile and path is condensed here from the Mission Brochure. https://3.bp.blogspot.com/-R8fuwC--tQk/WTOPCLgRy_I/AAAAAAAACH0/DAMiVK00lEgVK7Azk-z9SW9QAyXdLl_qQCLcB/s1600...
by SSSalvi
13 May 2017 19:25
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

^
Mk3 : GSAT 19E from Second Launch Pad on 5th June.

GSAT 17 has left for Kourou 2 days back ( http://www.isac.gov.in/flagoff-GSAT-17.jsp ) for launch atop Ariane 5 on June 28 along with Inmarsat-S

GSAT-11 - planned for Ariane 5 launch in December.
by SSSalvi
06 May 2017 04:57
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

https://forum.nasaspaceflight.com/index.php?action=dlattach;topic=36540.0;attach=1425626;image Graphic shows the point of Insertion and the achieved orbit. ( Bracket values are Target value as per brochure ) Perigee Point Height = 170 Kms ( 165 to 175 Kms ) Apogee point Height = 35918 Kms ( 35975 +...
by SSSalvi
05 May 2017 19:06
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

NASA is so confident of GSLV's success, that they published an article yesterdin, saying that the GSLV had launched the South Asia satellite. Please note the date and time of the article onlee: https://www.nasaspaceflight.com/2017/05/indias-glsv-gsat-9-launch/ India’s GLSV rocket launches GSAT-9 Ma...
by SSSalvi
04 May 2017 23:11
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

May be now they want to change their image from a scientific organization to an operational entity by not releasing the Launch brochure.
by SSSalvi
04 May 2017 19:55
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

Strange, No brochure yet reg launch profile.
by SSSalvi
04 May 2017 06:06
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3729
Views: 721125

Re: Indian Space Programme Discussion - Sept 2016

GSLV F 09 Launch:
28 Hr Countdown staring @ 12:57 IST ( 07:27 GMT ) 4th May
Launch @ 16:57 IST ( 11:27 GMT ) 5th May

http://epaper.deccanchronicle.com/articledetailpage.aspx?id=8020855
by SSSalvi
03 May 2017 05:08
Forum: Trash Can Archive
Topic: Indian Missiles and Munitions Discussion - June'14
Replies: 4681
Views: 662958

Re: Indian Missiles and Munitions Discussion - June'14

^
^
^
The ' First One ' is clearly Chandipur Range and different than the current that is under discussion.

Go to advanced search