Protecting GPS in a Tumbling, Rolling Environment

The proposed antijam concept for interceptor missiles uses an innovative, low-cost, antenna electronics and GPS antenna configuration to receive GPS, and suppress jamming on high-speed, maneuvering missiles. The effort defines an antenna system, commutatorswitch and antijam electronics solution using digital signal processing. The concept detects jamming and optimizes jam suppression at all attitudes of a maneuvering interceptor. The GPS jam suppression configuration controls multiple antenna modes for GPSreceive and antijam to provide the best GPS constellation for time and navigation data. The system will support direct-Y acquisition and Lm. An innovative nulling approach adapts to tumbling and rolling platforms. Multiplexing between antennas and antijamelectronics optimizes performance. The switching architecture and suppression algorithm in the digital network supports these modes on a maneuvering platform. The digital signal processing antijam electronics solution can also support GPS hot acquisitionfrom launcher antijam assets and restore GPS time registration after launch.The advantage of the antijam configuration is that it is in a digital signal processing form that can support multiple modes of antijam operation.