Quoted by CrazyInsane105:
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And with all of this the Indians finally succeeded in making a multi-tracking anti-air system, something that was out in the market about a decade and a half ago.
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This itself proves conclusively that the radar of the Akash is completely indigenous and not copied from the Flap radar of the S-300.
It only borrows its concepts like the FT-2000 borrows the concept of anti-radiation homing from HARM missiles.
A longer range version is being developed. The Army intends to use the Rajendra radar in the artillery locating role as well. This happened by chance when upon testing the radar, it picked up artillery shells being fired from a nearby range.
Quoted by CrazyInsane105:
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I wouldn't mind at all if the Akash was a copy of the SA-6 because the SA-6 has a fearful reputation and can be very useful in the Pak-India scenario.
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The similarities between the SA-6 and the Akash are in the airframe.
I quote from the (now outdated) site from Bharat Rakshak:
"In appearance, Akash is very similar to the ZRK-SD Kub (SA-6), with four long tube ramjet inlet ducts mounted mid-body between wings."
Source:
The update on the Akash system is as follows:
"can track 100 targets simultaneously with onboard radar, move at 600 meters a second and deliver a 55-kilogram warhead across 27 kilometers in 50 seconds."
Source:
As for Akash's comparison with the patriot, one may refer to the following news report:
India's Patriot
Source:
Some excerpts:
"Akash is not yet an anti-missile missile whereas Patriot is. So where is the comparison? The answer was given by Prahlada in another context: Akash is the poor man’s Patriot. "It will be a real-time Patriot-1 for poor nations," said Prahlada.
Senior scientists in the DRDO believe that Akash can later be developed into a full-scale anti-missile weapon system. This has apparently prompted the Americans to offer Patriot.
Having successfully tested it more than 40 times, the DRDO is confident that Akash will be effective against low-flying missiles, aircraft and unmanned aerial vehicles. Unlike Patriot, Akash can be launched from static or mobile platforms, including a battle tank.
The missile has a range of 25 km, but what makes it superior to Patriot, apart from the mobility of its platform, is that it has thrust during the entire course of its 35-second flight. Patriot has thrust only for 12 seconds, after which the missile coasts, thus making it less accurate than Akash."
The article explains (more properly than the BR site), about the detailed working of the Akash SAM.