Wideband LPI Radar Subpulse Waveform Design, Processing, and Analysis
Hui Qiu, Xianxiang Yu, Guolong Cui, Jing Yang, Lingjiang Kong
Abstract
This article introduces a wideband waveform structure that leverages multiple degrees of freedom across multisubpulse, encompassing phase, carrier frequency, and subpulse duration. Intrapulse frequency agility is specifically concerned to achieve low probability of interception. Meanwhile, a processing framework capitalizing on the multisubpulse 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 or compressed sensing. Besides, the derivations of Doppler tolerance, unambiguous velocity and range, range and Doppler resolutions based on the proposed waveform, and the 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 high-velocity targets compared to conventional waveforms. In addition, the semiphysical experiment validates the practical feasibility of the proposed waveform design and processing scheme.