>>509730303
Here's the earlier 8 channel version. Both are also used on Gerans, and presumably UMPBs. The cruise missiles and ballistic missiles probably use a differen system, but we don't really know.
It's still able to jam the 8/12 antenna versions I think, but you need more and very well positioned emitters to hit the right angles, and that becomes very hard as the bomb isn't static but moving, so the angles of (relatively close by) jammers have a higher angular velocity than the satellites. It's probably effectively impossible to spoof a wrong position to a system like this with ground based jammers, but you may be able to swamp it out so much it rejects good signals too and the munition has to fall back to inertial guidance.