电波科学学报2026，Vol.41Issue(1)：197-209,13.DOI:10.12265/j.cjors.2025016
基于时频定位和边缘陷波的SAR图像射频干扰抑制方法
SAR image radio frequency interference suppression method based on time-frequency location and edge notch
摘要
Abstract
Faced with an increasingly complex electromagnetic environment of space,synthetic aperture radar(SAR)is vulnerable to radio frequency interference(RFI)in the same frequency band,which seriously affects the interpretation of SAR images.The traditional instantaneous spectral notch method is simple to implement,but it conducts interference notch on the time-frequency diagram(TFD)by threshold value.Therefore,the interference suppression effect is not good because of no considering the residual interference component in the time-frequency diagram.To this problem,this paper presents a method of SAR image radio frequency interference suppression based on time-frequency location and edge notch.First,RFI detection is carried out in the two-dimensional time domain.The time-frequency diagrams are obtained by discrete short-time Fourier transform(STFT)for those disturbed range echoes.Second,interference points in the time-frequency diagram are extracted by Pauta criterion which are sorted roughly by depth first search algorithm.Then different interference strips are obtained by detection and unlocking of decussation.After detecting the edges of strips,the edge notch of interference strips is achieved.Last,the suppressed time-frequency diagram is inversely converted to range echo.The finally suppressed SAR image is obtained by imaging echoes which are composed of the suppressed range echoes and the originally undisturbed range echoes.The experimental results on simulated and measured SAR data show that the edge notch method is suitable for different scenarios and various types of RFI.The residual interference components are effectively eliminated under different jam-to-signal ratios which certificates that the method presented in this paper achieves better suppression efficiency than frequency notch method and instantaneous spectral notch method.关键词
合成孔径雷达(SAR)/射频干扰(RFI)抑制/边缘陷波法/瞬时谱陷波法/时频定位/深度优先搜索Key words
synthetic aperture radar(SAR)/radio frequency interference(RFI)suppression/edge notch/instantaneous spectral notch/time-frequency location/depth first search分类
信息技术与安全科学引用本文复制引用
付义辉,周鹏,陈思伟..基于时频定位和边缘陷波的SAR图像射频干扰抑制方法[J].电波科学学报,2026,41(1):197-209,13.基金项目
国家自然科学基金(U24B20189,62122091) （U24B20189,62122091）
湖南省科技创新计划(2024RC1040)National Natural Science Foundation of China(U24B20189,62122091) （2024RC1040）
The Science and Technology Innovation Program of Hunan Province(2024RC1040) （2024RC1040）
