A Radar Imaging Method Using Nonperiodic Interrupted Sampling Linear Frequency Modulation Signal

Linear frequency modulation (LFM) signal is widely applied in imaging radar including synthetic aperture radar (SAR) and inverse SAR (ISAR). Jamming techniques against LFM imaging radar develop rapidly in the past decades, which make radar imaging with LFM signal to face a great challenge. In this paper, a novel radar imaging method using nonperiodic interrupted sampling-LFM (NIS-LFM) signal is proposed. The radar anti-jamming performance can greatly benefit due to the random property of the NIS-LFM signal. Besides, the compressive sensing-based algorithm is further proposed for radar image reconstruction by utilizing the piecewise sparsity of the NIS-LFM echo. Both measured ISAR data simulations and microwave anechoic chamber experiments demonstrate the validity of the proposed imaging method.

I. Introduction

The high-resolution radar image makes great contribution to target recognition by describing target information such as length, size and shape. Hence imaging radar including synthetic aperture radar (SAR) and inverse SAR (ISAR) plays a significant role in both civil and military applications due to its high-resolution capability over a long distance [1], [2].