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Interference Mitigation for Synthetic Aperture Radar Based on Deep Residual Network

1
Key Laboratory of Electronic Information Countermeasure and Simulation Technology of Ministry of Education, Xidian University, Xi’an 710071, China
2
School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
3
National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(14), 1654; https://doi.org/10.3390/rs11141654
Received: 21 June 2019 / Revised: 7 July 2019 / Accepted: 8 July 2019 / Published: 11 July 2019
(This article belongs to the Special Issue Radio Frequency Interference (RFI) in Microwave Remote Sensing)
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Abstract

Radio Frequency Interference (RFI) is a key issue for Synthetic Aperture Radar (SAR) because it can seriously degrade the imaging quality, leading to the misinterpretation of the target scattering characteristics and hindering the subsequent image analysis. To address this issue, we present a narrow-band interference (NBI) and wide-band interference (WBI) mitigation algorithm based on deep residual network (ResNet). First, the short-time Fourier transform (STFT) is used to characterize the interference-corrupted echo in the time–frequency domain. Then, the interference detection model is built by a classical deep convolutional neural network (DCNN) framework to identify whether there is an interference component in the echo. Furthermore, the time–frequency feature of the target signal is extracted and reconstructed by utilizing the ResNet. Finally, the inverse time–frequency Fourier transform (ISTFT) is utilized to transform the time–frequency spectrum of the recovered signal into the time domain. The effectiveness of the interference mitigation algorithm is verified on the simulated and measured SAR data with strip mode and terrain observation by progressive scans (TOPS) mode. Moreover, in comparison with the notch filtering and the eigensubspace filtering, the proposed interference mitigation algorithm can improve the interference mitigation performance, while reducing the computation complexity. View Full-Text
Keywords: Radio Frequency Interference (RFI); interference mitigation; Synthetic Aperture Radar (SAR); deep residual network (ResNet) Radio Frequency Interference (RFI); interference mitigation; Synthetic Aperture Radar (SAR); deep residual network (ResNet)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Fan, W.; Zhou, F.; Tao, M.; Bai, X.; Rong, P.; Yang, S.; Tian, T. Interference Mitigation for Synthetic Aperture Radar Based on Deep Residual Network. Remote Sens. 2019, 11, 1654.

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