Defense Industry Daily reports that the AN-SPQ-9B, the firecontrol system and secondary air-search on the Bertholf class National Security Cutters, is being modified to provide a Periscope Detection and Discrimination (PDD) capability.
The post also provides additional background information on the sensor.
Interestingly, the post also notes that the radar has a “Cooperative Engagement Capability” or CEC (See the April 24/12: CEC entry) which means that ships and aircraft can share a common tactical picture and weapons launched from one unit can be controlled by a different unit. If we ever get long range missiles, this could be useful.
Hopefully the Offshore Patrol Cutter will have either this system or a better replacement.