Pulsed interference mitigation employing periodic nonuniform decimation

摘要

Suppression of wideband signals contaminated by pulsed interference is undertaken using synchronous temporal blanking. This repetitive time gating of the raw signaling waveforms employed at physical level of communications, radar or sensor systems can sometimes largely remove interference, but leaves a waveform remnant that will often be insufficient to permit satisfactory restoration of the entire signal waveform through simple interpolatory filtering. If the interference is periodic the requisite gating of the digitized signal can be treated as periodic nonuniform decimation. We undertake restoration using the “alias unraveling” approach, introducing a digital filter design of the sampling pulse which leads to significantly better conditioning of the unraveling matrix, and affords a very considerable extension of resilience to interferer duty cycle.