Wideband Jamming Cancellation for Wideband Phased Array Radar: Digital Beamforming Architecture and Preliminary Results

The increasing desire for high resolution measurements in modern radar has motivated the development of wideband phased array radar system. However, the wideband jamming is introduced, a threat to detection and recognition. In order to suppress the wideband jamming, the highly efficient subbanding technique is exploited by decomposing the entire wide band into multiple subbands in which narrowband adaptive processing can still be practiced. Due to low-rate hardware, the conventional architecture intended to do all the other processing over narrowband so that subband decomposition is required right after IF digitalization. Utilizing the state-of-the-art technology of high ADC and digital processor, this paper contributes to proposing an enhanced wideband beamforming architecture. By converting the wideband signals from IF to baseband, true wideband processing is enabled at baseband and only jamming cancellation is remained within subband. Advantages include improved beam steering accuracy, less subbanding distortion, lower computation cost and so on. Cancellation performance is evaluated both by simulation and with an experimental wideband digital phased array system. Fruitful results are presented using data collected from the array in presence of wideband jamming.

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