This has been considered.
Since the Stryker is used with dismounted infantry, a system that smacks into the RPG (which is not in the sky, rather it is a short range system with minimal trajectory) and blows it up would cause grave risk to any dismounts in the area.
The Russians also have a system that shoots something like shot in the general direction of the anti tank round, putting a dent in the carfully machined penetrator, reducing its penetration capability.
One Russian idea that has been fieled is the slat armor. The detonator on the RPG is about the diameter of a dime, and the round is about 80 mm in diameter. The slat usually bashes up the RPG round and will usually miss the detonator.
Another Israeli idea is Blazer reactive armor: it puts explosive blocks on the outside of tanks. Again, because of the risk to dismounted infantry, this is not suitable for infantry vehicles.
Number of men killed by RPG rounds inside a US tank in the last 20 years: 1.
Number of men killed by RPG rounds while working outside of an armored vehicle: ~400
Important to know how big the problem is. The big problem in Iraq seems to be the IED, usually made out of artillery shells, wired to a cell phone or other remote detonator.
"Number of men killed by RPG rounds inside a US tank in the last 20 years: 1.
Number of men killed by RPG rounds while working outside of an armored vehicle: ~400
Important to know how big the problem is. The big problem in Iraq seems to be the IED, usually made out of artillery shells, wired to a cell phone or other remote detonator."
They do seem to bounce around between Hummers, Strikers and tansk a good bit but your same question asked about AFV's would show a heck of a lot of casualties from RPG's