Wednesday, July 15, 2009

Beidou Satellite Navigation System


Anonymous said...

but the Barak-8ER LR-SAM has dual-mode guidance
can u show me any related data for this

Anonymous said...

and what is the range of barak-8 LR SAM compared to barak-8

Prasun K Sengupta said...

The data with illustrations and CG-animations (same as that for Patriot PAC-3) is available but hasn't been approved as yet for publication. The Barak-8 MR-SAM has a 70km-range and the Barak-8ER LR-SAM has a 120km-range.

sachin_sathe said...


isn't GAGAN meant mainly for civilian work while IRNSS is to have military applications(i have ISRO's pdf on IRNSS).

Also regarding the python-5 based IDAS type system why will it be restricted to ATV why can't it be integrated with scorpene class and the 2nd line subs?

Can u post a comparison of the Beidou system and the IRNSS?

Regarding the Barak-8ER is will it have electro-optical sensor as well for combined guidance?

Also please specify role of DRDO in these projects(the python-55 based IDAS and Barak-8/8ER

Anonymous said...

Prasun da,

What will be the future of the Kaveri engine now that the IAF has decided not to go with it for LCA Mk2?Will it in future power the ADA-IAF MCA?

Janes Defence in it's latest report has said that the Russian ship building industry is incapable of producing quality warships.So what will be the quality of the second line of krivak frigates being build.Considering the state of the Russian ship industry will India order 3rd batch of krivaks.

Please also tell me about the the PL-12 AAM that china is developing and also about the reported joint development of the R-77 AAM between India and Russia.

thank you

Nava said...


Do the Barak 8 and Barak 8ER have the same active radar seeker?

Anonymous said...

Do the Barak 8 and Barak 8ER have the same active radar seeker
yes,but some people don't believe this

Nava said...

Why would it be controversial? It's a minor issue. Note that in the Barak 8ER I mean in addition to the FPA.

Prasun K Sengupta said...

To Sachin Sathe: GAGAN does not require a dedicated or separate GPS satellite constellation as it is purely for commercial applications. Regarding the sub-launched Python 5-based SHORADS it could kind its way on to the Scorpenes from vessel no 4 onwards. The Barak-8ER LR-SAM will have both active radar as well as optronic sensor for terminal guidance and the active radar will be common to both the Barak-8 and Barak-8ER (Nava, kindly do take note). The DRDO will integrate the Python-5 cannisters (up to four) with the ATV technology demonstrator's hull. RAFAEL will supply the VLS module and the missiles off-the-shelf. All test-/qualification firings will be done in Indian waters under the DRDO's supervision.

To Anon@7:01AM: Given the ad hoc nature of R & D concerning the Kaveri and the Tejas LCA Mk2, the definitive Kaveri turbofan is at least another seven years away and will therefore not be financially viable for both the Tejas Mk2 and the FGFA. Regarding Russia's inability to build 'quality warships', I respectfully disagree with JDW. For both the third batch of Project 1135.3-class FFGs as well as for the three projected Project 15C DDGs, Russia very much remains an active player. In fact, just about a fortnight ago, Navy HQ decided to go in a big way for the S-band EL/M-2248 MF-STAR and navalised variant of the EL/M-2080 L-band LRTR, starting with the IAC aircraft carrier (I'm told the Navy is now pressing for them on INS Vikramaditya as well, since SEVMASH has yet to begin installing the sensors on board the carrier, giving India enough time to source the hardware from Israel and supply them to SEVMASH as customer-furnished equipment), and then also installing them on the three Project 17A FFGs, for the 7th, 8th and 9th Project 1135.3-class FFGs as well as for the three Project 15C-class DDGs. The combined Raytheon/Lockheed Martin proposal for the AEGIS/SPY-1E/F package has already been discarded and is no longer an option. All this wasa decided just a fortnight ago. And Russia is now perfectly willing to install such Israel-origin sensors on board its proposed new-generation FFGs and DDGs that it is offering to India.

Prasun K Sengupta said...

Even the follow-on Project 15B DDGs will have the S-band EL/M-2248 MF-STAR and navalised variant of the EL/M-2080 L-band LRTR. Contract negotiations are currently in progress for this project.

Nava said...

Is this navalised Green pine full sized or miniaturized to some extent?

Prasun K Sengupta said...

To Nava: Well, the antenna size is scaleable, but from what I saw in illustrations prepared by Cochin Shipyards Ltd earlier this year during the keel-laying ceremony of the IAC, the radar's variant for aircraft carriers will be about the same size as the land-based Green Pine LRTR.

Anonymous said...

when u look at 2248 radar video the radar face is pretty small

Prasun K Sengupta said...

I believe the most realistic illustrations of the EL/M-2248 MF-STAR and the navalised Green Pine were those prepared by Cochin Shipyards Ltd earlier this year for the keel-laying ceremony of the IAC.

subroto said...

GAGAN is not the same of India's proposed regional constellation of GPS navigation satellites.

As you have mentioned GAGAN project is only for the commercial purpose say, for the aviation sector to navigate on a straight path, improve airport and airspace access in all weather condition, enhance reliability and reduce delays; provide uniform and accurate navigation performance over the entire airspace and provide CAT-I approach without ground element support.

The concept of "network-centric warfare" also depend on satellite navigation for precision and for a precise system, especially for military purposes, at least 24 satellites are required, so that three satellites are available over a particular point at any given point of time. After America's Global Positioning System (GPS), Russian GLONASS is currently the only other satellite-based navigation system use for military applications.

Is there any other GPS based project going for the Indian Military Application or we will depend on Russian Global Navigation Satellite System (GLONASS)?

Prasun K Sengupta said...

To Subroto: The 24-satellite constellation is reqd for global coverage. However, the IRNSS, as the name suggests, is designed to have a regional geographic footprint, covering the Indian Ocean area, South Asia and Central Asia. The constellation can be up-scaled in future if desired. Once the IRNSS is operationalised there will be no further need for GLONASS-based Py-code access.