Wideband LPI Radar Subpulse Waveform Design, Processing and Analysis

This paper introduces a wideband waveform structure that leverages multiple degrees of freedom across multisubpulse, encompassing phase, carrier frequency, and subpulse duration. Intra-pulse Frequency agility is specifically concerned to achieve low probability of interception (LPI). Meanwhile, a processing framework capitalizing on the multi-subpulse characteristics of the waveform is proposed. Each subpulse serves as a matched filter for echo processing, followed by range gate adjustments based on subpulse durations for each filtered echo. Subsequently, Doppler processing is implemented using either discrete Fourier transform (DFT) or compressed sensing (CS). Besides, the derivations of Doppler tolerance, unambiguous velocity and range, range and Doppler resolutions based on the proposed waveform and corresponding processing method are demonstrated under some specific parameters. Numerical simulations emphasize the superior performance of the proposed approach in anti-interception and reliable detection of highvelocity targets compared to conventional waveforms. Additionally, the semi-physical experiment validates the practical feasibility of the proposed waveform design and processing scheme.