With the losses caused by Precision rocket artillery, could Russia possibility use their AWACs fleet to aid in detecting, identifying and destroying incoming HIMARS shells? One would assume that a GPS guided shell will have a very different flight path compared to a unguided rocket...
C-RAM has always been a very hard task for several reasons.
1- Artillery projectiles have relatively low flight times but are usually supersonic. Quick reaction times and fast SAMs are needed. C-RAM task is more similar to ABM rather than traditional air defense.
2- Artillery projectiles are relatively cheap and small. Thus they are very common on the battlefield and are usually launched in large numbers. So you need relatively cheap and small (important for magazine depth and logistics) SAMs. Your radars need to be capable of detecting small objects from long distances and tracking many of them simultaneously. And the system needs to be able to engage many targets simultaneously.
3- High speeds, small interceptor missiles and small targets collectively mean high-resolution sensors are needed. This further complicates the missile and radar design
So the task is pretty specialized as you can see. I don't think you will get an effective C-RAM out of improvised solutions. Russia is probably intercepting a lot of rockets but a lot of them will continue to go through. And GPS guided rockets don't have a different flight trajectory at all unless they do a pull-up maneuver. They use GPS to correct deviations.
