The reason for a somewhat unusual series of two launches of ABM interceptor in a row, conducted in October 2007, was that the Space Forces are working on an upgrade of the Don-2N radar of the Moscow ABM system. According to Vladimir Popovkin, the commander of the Space Forces, the first test was conducted to confirm characteristics of the missile and the second one - to test the "new computational system and its software" that is being installed at the Don-2N radar. The tests took place on October 11, 2007 and October 30, 2007.
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Hello and Season's Greetings to you all!
Regarding the fact that these tests were held at the Sary Shagan Polygon does that mean that they modified the DON-2NP Prototype at Priozyorsk, too? - Because I can't imagine that they would control the Test Missile from Sofrino Site...
Bernd, you are certainly right - the new software is being tested on the prototype radar. But eventually it is the Don-2N in Pushkino that will be upgraded.