利用稀疏CP-OFDM的SAR抗干擾成像方法研究

史海旭; 徐仲秋; 李光祚; 林寬; 洪文

doi:10.11999/JEIT240092

利用稀疏CP-OFDM的SAR抗干擾成像方法研究

doi: 10.11999/JEIT240092 cstr: 32379.14.JEIT240092

1.
中國科學(xué)院空天信息創(chuàng)新研究院北京 100094
2.
空間信息處理與應(yīng)用系統(tǒng)技術(shù)重點實驗室北京 100094
3.
中國科學(xué)院大學(xué)電子電氣與通信工程學(xué)院北京 101499

詳細(xì)信息

作者簡介:
史海旭：男，博士生，研究方向為信號與信息處理

徐仲秋：男，助理研究員，研究方向為稀疏SAR成像，SAR抗干擾成像

李光祚：男，副研究員，研究方向為信號與信息處理

林寬：女，副研究員，研究方向為信號與信息處理

洪文：女，研究員，博士生導(dǎo)師，研究方向為合成孔徑雷達(dá)成像與系統(tǒng)及其應(yīng)用等

通訊作者:
李光祚　ligz@aircas.ac.cn

中圖分類號: TN974
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- 文章訪問數(shù): 253
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2024-02-22
- 修回日期: 2024-11-06
- 網(wǎng)絡(luò)出版日期: 2024-11-13
- 刊出日期: 2024-12-01

Research on SAR Anti-jamming Imaging Method with Sparse CP-OFDM

1.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
2.
Key Laboratory of Spatial Information Processing and Application System Technology, Beijing 100094, China
3.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 101499, China

摘要

摘要: 合成孔徑雷達(dá)(SAR)是一種微波遙感成像雷達(dá)。近年來，隨著數(shù)字化技術(shù)和射頻電子技術(shù)的進步，針對SAR成像的干擾技術(shù)不斷發(fā)展，基于數(shù)字射頻存儲技術(shù)(DRFM)的有源欺騙干擾更是給民用和軍用的SAR成像系統(tǒng)帶來了前所未有的考驗。針對欺騙干擾開展SAR成像抗干擾研究，該文首先引入帶有循環(huán)前綴的正交頻分復(fù)用(CP-OFDM)波形進行正交波形分集設(shè)計與波形優(yōu)化，獲取具備優(yōu)異自相關(guān)峰值旁瓣水平和互相關(guān)峰值水平的CP-OFDM寬帶正交波形集；然后引入稀疏SAR成像理論，將CP-OFDM波形與稀疏SAR成像相結(jié)合，采用稀疏重構(gòu)算法對CP-OFDM回波進行成像，實現(xiàn)具備抗欺騙干擾能力的高質(zhì)量、高精度SAR成像。最終，開展了點目標(biāo)、面目標(biāo)以及基于真實數(shù)據(jù)模擬的復(fù)雜場景仿真實驗，證明了所提方法可以將欺騙干擾產(chǎn)生的假目標(biāo)完全去除，并對旁瓣進行抑制，實現(xiàn)高精度成像。
- SAR抗干擾 /
- 帶有循環(huán)前綴的正交頻分復(fù)用(CP-OFDM) /
- 波形分集 /
- 稀疏SAR成像
Abstract: Synthetic Aperture Radar (SAR) is a microwave remote sensing imaging radar. In recent years, with the advancement of digital technology and radio frequency electronic technology, the jamming technology of SAR imaging is developed rapidly. The active jamming such as deception jamming based on Digital Radio Frequency Memory (DRFM) technology brings serious challenges to SAR imaging systems for civil use and military use. For research on SAR anti-jamming imaging against deception jamming, firstly, orthogonal waveform diversity design and waveform optimization is carried out for Orthogonal Frequency Division Multiplexing waveforms with Cyclic Prefixes (CP-OFDM). And the CP-OFDM wide band orthogonal waveform set with excellent autocorrelation peak sidelobe level and cross-correlation peak level is obtained. Then the sparse SAR imaging theory is introduced, which is combined with CP-OFDM. By using the sparse reconstruction method, the high-quality and high-precision imaging with anti-jamming capability is realized. Finally, simulation based on point targets, surface targets and real data is conducted, and it is proved that the method can completely remove the false targets generated by deception jamming, suppress sidelobes and achieve high-precision imaging.
- SAR anti-jamming /
- Cyclic Prefixes based Orthogonal Frequency Division Multiplexing (CP-OFDM) /
- waveform diversity /
- Sparse SAR imaging

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圖 1 總體研究框圖

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圖 2 CP-OFDM波形集相關(guān)指標(biāo)

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圖 3 點目標(biāo)成像結(jié)果

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圖 4 切片包絡(luò)分析

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圖 5 面目標(biāo)成像結(jié)果

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圖 6 復(fù)雜場景成像結(jié)果

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表 1 機載SAR成像參數(shù)

距離向參數(shù)	數(shù)值	單位	方位向參數(shù)	數(shù)值	單位
景中心斜距	30	km	等效雷達(dá)速度	250	m/s
高度	10	km	雷達(dá)工作頻率	9.4	GHz
發(fā)射脈沖時寬	10	μs	合成孔徑長度	850	m
LFM信號調(diào)頻率	10	MHz/μs	天線長度	1	m
LFM信號帶寬	100	MHz	脈沖重復(fù)時間	1.67	ms
CP-OFDM信號帶寬	120	MHz	斜視角	0	°
距離向采樣率	120	MHz

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表 2 點目標(biāo)和面目標(biāo)成像指標(biāo)

成像方式	點目標(biāo)成像指標(biāo)				面目標(biāo)成像指標(biāo)
成像方式	ISR (dB)	SDR (dB)	距離向PSLR(dB)	方位向PSLR(dB)	ISR (dB)	SDR (dB)
LFM匹配濾波	0	5.95	–22.51	–19.84	0	–2.98
CP-OFDM匹配濾波	2.12	3.01	–13.61	–18.34	1.91	–5.85
稀疏CP-OFDM	5.45	$ - \infty $	–319.86	–321.72	3.95	–19.33

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表 3 星載SAR雷達(dá)參數(shù)

距離向參數(shù)	數(shù)值	單位	方位向參數(shù)	數(shù)值	單位
景中心斜距	850	km	等效雷達(dá)速度	7100	m/s
高度	800	km	雷達(dá)工作頻率	5.3	GHz
發(fā)射脈沖時寬	40	μs	合成孔徑長度	4800	m
LFM信號調(diào)頻率	0.5	MHz/μs	天線長度	10	m
LFM信號帶寬	20	MHz	脈沖重復(fù)時間	588.24	μs
CP-OFDM信號帶寬	24	MHz	斜視角	0	°
距離向采樣率	24	MHz

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表 4 復(fù)雜場景干擾抑制比和信號失真比(dB)

成像方式	ISR	SDR
LFM匹配濾波	0	–11.96
CP-OFDM匹配濾波	0.15	–14.55
稀疏CP-OFDM	0.27	–19.50

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