>>507552153
no idea, probably something new. My guess is that since israel is well within iran's missile range limits, they took something like a shahab-3 and reprogrammed it to not use all its fuel on the ascent phase and instead use some on the descent. This would give it shorter range but a higher terminal velocity that rapidly increases, confusing defensive radar/software which expects a predictable speed and trajectory.
Ballistic missiles typically work sort of like cannon balls. They have a very short burn phase where they accelerate out of the atmosphere, then they coast the rest of the way at very high speeds on a ballistic trajectory (sometimes maneuvering at the end, but that can be done without fuel). Anyway, what this means is that to hit nearby targets with longer range missiles, you have to elevate them a lot (won't work because then they'll go into orbit). This seems to be a way to utilize longer range missiles for hitting israel without underloading the missile's fuel while still making that fuel serve a purpose.