AN EFFICIENT SAR JAMMER WITH DIRECT RADIO FREQUENCY PROCESSING (DRFP)

DRFM (Digital Radio Frequency Memory) is now widely utilized by modern radar jammers due to its high e-ciency in jamming generation. However, its jammer structure is somewhat complex, since the up-conversion and down-conversion processes must be included. This paper proposes a new Synthetic Aperture Radar (SAR) jammer architecture utilizing Direct Radio Frequency Processing (DRFP), wherein both the up-conversion and down-conversion modules can be excluded. DRFP has a very compact hardware structure which employs Direct Digital Synthesizer (DDS), phase shifter, and delay lines for jamming modulation. Finally, the performances of DRFP are shown by both the inner-fleld test and a rail-way SAR experiment to be rather efiective in jamming generation.