Care to be more specific? Are you looking for a tech that makes building missile-targeting or a tech that makes unit targeting missiles fired from dome building (rocket silos) or something else?
If you're looking for either of the first 2 things then you're out of luck, both do not exist.
The only 2 anti missile tech for bases is Bastion, built in the Weapons Lab and the Icarus, which came out during the SF Era. Icarus is outdated considering Cardinal is anti missile, liberators can easily shoot down PK's. the only missiles that people spam are Mavericks. which cant be shot down, thats where bastion comes in to prevent all missile launches until destroyed
If you're looking for either of the first 2 things then you're out of luck, both do not exist.