DIGITALLY IMPLEMENTED HF/VHF RECEIVER DEVELOPMENT

THE DIRAD TEAM HAS IDENTIFIED A DIGITALLY IMPLEMENTED RECEIVER ARCHITECTURE THAT PROVIDES UNIQUE PERFORMANCE CAPABILITIES PRESENTLY UNATTAINABLE IN CONVENTIONAL ANALOG RECEIVER IMPLEMENTATIONS; BANDPASS FILTER CHARACTERISTICS, WIDEBAND AGC OPERATION, NOISE REDUCTION/ ADAPTABILITY, MULTIPLE INTEGRATED CONFIGURATIONS, IMPROVED A/J PERFORMANCE, AND GREATLY REDUCED ILS POTENTIAL ARE INCLUDED. THIS PROPOSAL DESCRIBES A TWO-PHASE EFFORT THAT LEDS TO THE FULL-SCALE DEMONSTRATION OF A DIGITALLY IMPLEMENTED RECEIVER CAPABLE OF RECEIVING WEAK SIGNALS AMONGST NOISE, OPERATION BY MULTIPLE USERS, FIRMWARE PROGRAMMABLE AND CONFIGURABLE INTO FREQUENCY HOPPING OR DIRECT SEQUENCE MODES OF OPERAITON. THE PHASE I EFFORT INCLUDES THE DEFINITION, DESIGN AND ANALYSIS TASKS THAT LEAD TO A FORMAL PRELIMINARY DESIGN REVIEW. PHASE II IS FOR THE DETAIL DESIGN, CRITICAL DESIGN REVIEW, FABRICATION, ASSEMBLY, LABORATORY AND FIELD TESTING OF A FULL-SCALE PORTABLE DIGITALLY IMPLEMENTED HF/VHF RECEIVER.