Wideband Interference Mitigation in High-Resolution Airborne Synthetic Aperture Radar Data
Wideband Interference Mitigation in High-Resolution Airborne Synthetic Aperture Radar Data
复制标题
高分辨率机载合成孔径雷达数据中的宽带干扰抑制
DOI：
10.1109/tgrs.2015.2450754
复制
发表时间：
2016-01-01
影响因子：
8.2
通讯作者：
Zhang, Zijing
中科院分区：
文献类型：
--
作者：
Tao, Mingliang;Zhou, Feng;Zhang, Zijing
射频干扰是影响合成孔径雷达（SAR）成像的主要问题。特别是宽带干扰（WBI）的存在下，信号干扰比（SIR）的测量大大降低，从而使它难以产生高质量的SAR图像。与窄带干扰相比，WBI占用的带宽更大，处理起来也更复杂。本文讨论了高分辨率机载SAR数据中WBI的检测和抑制。首先利用短时傅里叶变换在时频表示中表征WBI污染的回波。这样，原来的距离谱WBI抑制问题可以简化为一系列的瞬态谱NBI抑制问题。对于每个瞬时频谱，可以根据基于负熵的统计检验来识别干扰信号的存在。此外，通过陷波滤波或特征子空间滤波来减轻干扰信号。仿真数据和真实的测量数据的实验结果表明，该方法能有效地抑制干扰信号，获得高质量的图像。
Radio frequency interference is a major issue for synthetic aperture radar (SAR) imaging. Especially with the presence of wideband interference (WBI), the signal-to-interference ratio (SIR) of the measurements is greatly degraded, thus making it difficult to produce a high-quality SAR image. Compared with narrow-band interference (NBI), WBI occupies a larger bandwidth and is more complicated to deal with. This paper addresses the detection and mitigation of WBI in high-resolution airborne SAR data. First, a WBI-corrupted echo is characterized in the time-frequency representation by utilizing the short-time Fourier transform. In this way, the original range-spectrum WBI mitigation problem can be simplified into a series of instantaneous-spectrum NBI mitigation problems. For each instantaneous spectrum, the existence of interference signal can be identified according to the negentropy-based statistical test. Furthermore, the interference signal is mitigated by notch filtering or eigensubspace filtering. The experimental results of the simulated data, as well as real measured data sets, show that the proposed scheme is effective in suppressing the interference signal and in obtaining a high-quality image.