單通道合成孔徑雷達抗調(diào)頻斜率失配干擾新方法

孟智超; 盧景月; 張帥欽; 張磊; 王虹現(xiàn)

doi:10.11999/JEIT190687

單通道合成孔徑雷達抗調(diào)頻斜率失配干擾新方法

doi: 10.11999/JEIT190687 cstr: 32379.14.JEIT190687

1.
西安電子科技大學雷達信號處理國家重點實驗室西安 710071
2.
63610部隊庫爾勒 841001
3.
中山大學電子與通信工程學院廣州 510275

基金項目: 國家自然科學基金(61771372, 61771367)

詳細信息

作者簡介:
孟智超：男，1997年生，博士生，研究方向為合成孔徑雷達成像與抗干擾

盧景月：男，1994年生，博士生，研究方向為合成孔徑雷達成像

張帥欽：男，1983年生，高級工程師，研究方向為雷達目標特性與目標識別

張磊：男，1984年生，副教授，研究方向為合成孔徑雷達成像，目標識別

王虹現(xiàn)：男，1979年生，副教授，研究方向為雷達信號處理

通訊作者:
張磊　zhanglei57@mail.sysu.edu.cn

中圖分類號: TN975
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- 文章訪問數(shù): 2453
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2019-09-05
- 修回日期: 2020-04-02
- 網(wǎng)絡(luò)出版日期: 2020-04-11
- 刊出日期: 2020-09-27

A New Method of Anti-FM Slope Mismatch Jamming for Single Channel Synthetic Aperture Radar

1.
National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China
2.
No.66393 Unit, the PLA, Kuerle 841001, China
3.
School of Electronic and Communication Engineering, Sun Yat-sen University, Guangzhou 510275, China

Funds: The National Natural Science Foundation of China (61771372, 61771367)

摘要

摘要: 該文針對單通道合成孔徑雷達(SAR)無法有效抑制調(diào)頻斜率失配干擾的問題進行了深入的研究。根據(jù)干擾頻譜與真實回波頻譜的差異，該文提出了一種基于頻域匹配濾波處理的合成孔徑雷達調(diào)頻斜率失配干擾抑制方法。該方法在準確測得干擾調(diào)頻斜率的基礎(chǔ)上，首先利用干擾信號的空間稀疏性以及低信干比(SIR)的特點，對干擾位置進行稀疏超分辨估計以獲得較為精確的干擾時延相位。然后通過獲得的干擾調(diào)頻斜率和時延相位重建干擾信號頻譜，以此為基礎(chǔ)設(shè)計正交匹配濾波器在頻域?qū)嵤└蓴_信號的抑制，并重建無失真場景圖像。最后，計算機仿真實驗驗證了該文所提方法的有效性。
- 抗干擾 /
- 調(diào)頻斜率失配干擾 /
- 稀疏 /
- 正交匹配濾波
Abstract: The problem that single-channel Synthetic Aperture Radar (SAR) can not effectively suppress FM slope mismatch jamming is studied in this paper. According to the difference between the jamming spectrum and the real echo spectrum, a method for suppressing the mismatch jamming of SAR FM slope based on matched filtering in the frequency domain is proposed. Based on the accurate measurement of the slope of jamming FM, the sparse super-resolution estimation of the jamming position is carried out to obtain a more accurate phase of jamming delay by utilizing the sparsity of the jamming signal and the characteristics of low Signal-to-Interference Ratio (SIR). Then, the spectrum of the interference signal is reconstructed by the obtained slope of interference frequency modulation and phase delay. Based on this, the orthogonal matched filter is designed to suppress the interference signal in the frequency domain and reconstruct the undistorted scene image. Finally, computer simulation experiments verify the effectiveness of the proposed method.
- Anti-jamming /
- FM slope mismatch jamming /
- Sparse /
- Orthogonal matched filtering

HTML全文

圖 1 算法流程示意圖

下載: 全尺寸圖片幻燈片

圖 2 正交匹配濾波影響因子關(guān)系曲線

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圖 3 SIR對頻域陷波法干擾抑制比的影響

下載: 全尺寸圖片幻燈片

圖 4 點目標成像干擾抑制效果對比

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圖 5 干擾抑制成像對比實驗

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表 1 實驗參數(shù)

參數(shù)	數(shù)值	參數(shù)	數(shù)值
載頻	3 GHz	距離向采樣點	1024
信號帶寬	100 MHz	脈沖數(shù)	512
脈沖寬度	2 μs	脈沖重復頻率	3 kHz
采樣頻率	120 MHz	干擾點源數(shù)量	1
平臺速度	50 m/s	調(diào)頻斜率失配比	0.8

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