Solid-state upgrade for the Cobra Judy S-band phased array radar

The Cobra Judy S-band (CJ-S) radar is a unique phased-array data collection system mounted aboard the USNS Observation Island (Figure 1). It is designed to collect dual frequency (S- and X-band), high precision metric and signature data needed for missile treaty verification and strategic and theater missile defense development. Designed in 1976 and first made operational in 1981, the transmitter hardware has become difficult to support and, in some cases, obsolete. In December 2004, Diversified Technologies, Inc. (DTI) was awarded a contract to upgrade the transmitter with solid-state technology.