Improved Aeronautical Global Positioning System (GPS) Antenna Systems

"This proposal is responsive to the needs of telemetry and datalink development groups at DoD Test Ranges, who need to operate high-power transmitters in close proximity to sensitive GPS equipment, and at frequency bands adjacent to the GPS band. Mayflowerproposes to use RF Adaptive Interference Canceller (RF AIC) technology, similar to GPS anti-jam systems, to suppress the above mentioned RFI by 30 dB or more, without any modifications to the existing GPS and telemetry/datalink equipment. Mayflower alsoproposes to integrate the above technology with a GPS antenna in a flight-certified unit, measuring 4.5" x 4.5" x 2.0", i.e., conforming to the footprint of a GPS FRPA (fixed radiation pattern antenna), and costing less that $1000. Mayflower also proposesto investigate the cost/size/performance trade-off's for obtaining an additional 30 dB of adjacent RFI suppression through a high-power transmitter filter module.The main objectives of the Phase I study effort are: (A) Perform requirements analysis regarding RFI characteristics and GPS receiver sensitivity, and performance analysis of the proposed RFI cancellation technique. (B) Perform preliminary hardware andsoftware design of the proposed RFI canceller. This work will include selection of commercially available RF components, laboratory verification of the principle of operation by breadboarding critical components, and investigation of antenna integrationand certification issu