Solid-State Upgrade for the COBRA JUDY S-Band Phased Array Radar

The COBRA JUDY S-band (CJ-S) radar is a unique system designed to collect high precision metric and signature data needed for missile treaty verification and strategic and theater missile defense development. The COBRA JUDY S-band phased-array radar became operational in 1981. The radar's transmitter hardware is nearly 25 years old, and many of its components have become difficult to support and maintain. In December 2004, based upon the success of DTI's earlier COBRA JUDY X-band transmitter upgrade, DTI was awarded a contract to replace all of the electronics systems in the S-band transmitter between ship's power and the 16 TWTs, and to provide greatly enhanced control, fault handling, and diagnostics. This paper discusses the upgrade made by DTI to the COBRA JUDY radar.