电波科学学报2026，Vol.41Issue(3)：613-621,9.DOI:10.12265/j.cjors.2025071
基于涡旋雷达双体制成像融合的低空目标多径虚像抑制研究
Multipath ghost suppression for low-altitude targets via dual-system imaging fusion in vortex radar
摘要
Abstract
To address the challenge of ghost interference caused by multipath effects in low-altitude radar imaging,this paper proposes a dual-system imaging fusion method based on vortex radar,incorporating both multiple-input single-output(MISO)and multiple-input multiple-output(MIMO)systems.A two-path propagation model is first established to derive the echo signal models for both systems.The impact of the Bessel spectrum envelope differences between the OAM source and its mirror image on imaging performance is analyzed.Furthermore,the spatial offset behavior of multipath-induced ghosts is investigated by comparing the point spread function(PSF)of the MISO and MIMO systems.Based on these differences,a Hadamard product-based fusion algorithm is proposed to suppress ghost artifacts by exploiting their complementary spatial distribution in the two systems.Simulation results demonstrate that the proposed method achieves a structural similarity index measure(SSIM)of 0.963 7.Compared with the SSIM values of conventional real-aperture radar,MISO-OAM radar,and MIMO-OAM radar under multipath conditions,the proposed method yields absolute SSIM improvements of 0.724 9,0.716 0,and 0.778 4,respectively.These results indicate a significant enhancement in imaging quality and provide an effective approach for high-resolution imaging of low-altitude targets under multipath interference.关键词
低空目标/多径效应/涡旋电磁波/点扩散函数(PSF)/虚像抑制Key words
low-altitude target/multipath effect/vortex electromagnetic wave/point spread function(PSF)/ghost image suppression分类
信息技术与安全科学引用本文复制引用
郭琮川,冯菊,张玺,尚玉平..基于涡旋雷达双体制成像融合的低空目标多径虚像抑制研究[J].电波科学学报,2026,41(3):613-621,9.基金项目
电磁空间安全全国重点实验室开放基金(JS0240405242)Open Foundation of National Key Laboratory of Electromagnetic Space Security(JS0240405242) （JS0240405242）
