Design methods for LPI radar waveforms targeting constraints of signal interception mechanisms in digital wideband receivers

With the rapid development of digital wideband receiver (DWR) technology, existing low probability of intercept (LPI) radars are confronted with substantial reconnaissance threats. Aiming to reduce the interception probability of radar signals by DWR, this paper proposes, for the first time, a novel LPI radar waveform design method targeting the constraints of signal interception mechanisms in DWR. First, a DWR encoder model is configured. The pulse description word (PDW) interception probability is defined as the core LPI metric of this paper. Constraints inherent to the transient response elimination and frequency-domain multiple signal detection mechanisms of the DWR encoder are revealed. Two LPI waveforms, the very narrow pulse waveform and the co-frequency orthogonal waveform, are designed to achieve a reduction in PDW interception probability. The effectiveness and performance advantages of the proposed LPI waveforms are verified through simulation experiments.