Retrofit Antijam Applique for Handheld GPS Recievers

Toyon Research Corporation has developed a single element, anti-jam, electronically reconfigurable antenna (ERA) that will serve as a retrofit for the existing antenna of the Precise Lightweight GPS Receiver (PLGR). Toyon's ERA will adaptively reconfigureitself so as to substantially reduce received jammer power while maintaining adequate RHCP gain for GPS reception. The ERA will react with maximum jammer signal attenuation within milliseconds, and will maintain jammer signal attenuation adaptively as thePLGR moves relative to the jammer.Under Phase I, Toyon has built a prototype ERA. Under Phase II, Toyon proposes to develop an Advanced Engineering Model (ADM) for the ERA. The ADM will be applicable, with minimal redesign in Phase III, to large-scale, low-cost production.