The main threat to the Israeli civilian population comes from ground terrorist attacks either through or under the security barriers and from rocket or mortar fire over them. Once the security barrier in the West Bank is complete and well-manned, ground attacks will be pretty much neutralized (tunneling can be detected fairly cheaply with seismic equipment and I don't know why Israel hasn't employed it yet). Rockets and mortar rounds over the fence are more problamatical because of their small size and short travel times. However, radar-computer systems exist which can detect these projectiles' trajectories, calculate their launch points, and predict their impact locations within seconds. There is a new radar-controlled gun called "metal storm" which can destroy the incoming projectiles in flight. The launch locations of the hostile fire can be counterfired with GPS guided munitions from MRLS or 155 mm Howitzer batteries within 60 seconds with incredible accuracy.
Saudi king to meet with Obama on Friday amid Gulf concerns over Iran deal (Reuters)
from the article: Defense Ministry: Home front inadequately protected for war