基于LFMCW體制的分布式SAR高分辨率成像方法研究

李堃; 梁興東; 陳龍永; 王杰; 吳一戎

doi:10.11999/JEIT160274

基于LFMCW體制的分布式SAR高分辨率成像方法研究

doi: 10.11999/JEIT160274 cstr: 32379.14.JEIT160274

2.
(中國(guó)科學(xué)院電子學(xué)研究所微波成像技術(shù)重點(diǎn)實(shí)驗(yàn)室北京 100190) ②(中國(guó)科學(xué)院大學(xué) 北京 100049)

基金項(xiàng)目:

國(guó)家高技術(shù)研究發(fā)展計(jì)劃(2013AA122201)，中國(guó)科學(xué)院國(guó)防科技創(chuàng)新基金(CXJJ-16M217)

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- 文章訪問(wèn)數(shù): 1252
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出版歷程
- 收稿日期: 2016-03-21
- 修回日期: 2016-10-12
- 刊出日期: 2017-02-19

Signal Model and High-resolution Imaging Approach for Distributed SAR Based on LFMCW Signals

2.
(Science and Technology on Microwave Imaging Laboratory, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)

Funds:

The National High Technology Research and Development Program of China (2013AA122201), The Innovative Foundation for the Chinese Academy of Sciences (CXJJ-16M217)

摘要

摘要: 分布式微小衛(wèi)星SAR是實(shí)現(xiàn)小型化、低成本星載SAR系統(tǒng)的重要途徑，然而，在該體制下，如何充分利用分布式系統(tǒng)資源，實(shí)現(xiàn)高分辨率成像是其面臨的關(guān)鍵問(wèn)題之一。該文提出一種利用LFMCW信號(hào)實(shí)現(xiàn)分布式微小衛(wèi)星平臺(tái)SAR的方法，并基于方位向編隊(duì)飛行的微小衛(wèi)星構(gòu)型，對(duì)其信號(hào)模型與高分辨率成像方法進(jìn)行了研究。該文方法使用多顆微小衛(wèi)星同時(shí)發(fā)射與接收頻分LFMCW信號(hào)，利用交叉接收的構(gòu)型使不同頻帶收發(fā)天線所形成的等效相位中心重合，進(jìn)而在距離向?qū)π盘?hào)進(jìn)行頻帶合成以恢復(fù)全帶寬信號(hào)，從而實(shí)現(xiàn)高分辨率SAR成像。該方法實(shí)現(xiàn)了分布式平臺(tái)信號(hào)的頻帶合成，為高分辨率LFMCW SAR技術(shù)在微小衛(wèi)星平臺(tái)上的應(yīng)用提供了理論支撐。仿真實(shí)驗(yàn)驗(yàn)證了理論分析的正確性以及方法的有效性。
- 合成孔徑雷達(dá) /
- 分布式微小衛(wèi)星 /
- 多發(fā)多收 /
- 線性調(diào)頻連續(xù)波 /
- 頻帶合成
Abstract: Distributed micro-satellites SAR has the capabilities of substantially miniaturizing the size and lowering the cost of space-borne SAR systems. However, one of the key issues is to take full advantage of the distributed resources and achieve high-resolution images. In this paper, an approach utilizing LFMCW signal is proposed to realize distributed micro-satellites SAR system. The signal model and the high-resolution imaging method is studied on the basis of the serial formation in azimuth. LFMCW signals are transmitted simultaneously and beat-frequency division signals are received by different micro-satellites. With the use of the crossed receiving technique, different sub-band signals with superposed equivalent phase centers can be acquired by the configuration design of formation flying, and then the full-bandwidth signal is synthesized to obtain high-resolution image. The proposed method synthesizes the sub-band signals of distributed platforms, which provides theoretical support for applying high-resolution LFMCW signals in the field of distributed micro-satellites SAR. The correctness of the theoretical derivations and the effectiveness of the approach is validated by simulation results.
- SAR /
- Distributed micro-satellite /
- MIMO /
- LFMCW /
- Sub-band synthesis

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參考文獻(xiàn)(26)

MOREIRA A, PONCE O, NANNINI M, et al. Multi-baseline imaging: A vision for spaceborne SAR[C]. 16th International Radar Symposium, Dresden, Germany, 2015: 20-29. doi: 10.1109/IRS.2015.7226407.

李晨雷, 劉梅, 趙伯文, 等. 星載分布式SAR地面動(dòng)目標(biāo)精確聚焦的互譜MUSIC法[J]. 電子與信息學(xué)報(bào), 2014, 36(8): 1905-1911. doi: 10.3724/SP.J.1146.2013.01456.

LI Chenlei, LIU Mei, ZHAO Bowen, et al. Cross spectrum MUSIC method of finely focusing ground moving target on spaceborne distributed SAR[J]. Journal of Electronics Information Technology, 2014, 36(8): 1905-1911. doi: 10. 3724/SP.J.1146.2013.01456.

李延, 張慶君, 劉亞?wèn)|, 等. 分布式天基雷達(dá)動(dòng)目標(biāo)檢測(cè)性能分析[J]. 航天器工程, 2015, 24(3): 64-68. doi: 10.3969/j.issn. 1673-8748.2015.03.011.

LI Yan, ZHANG Qingjun, LIU Yadong, et al. Analysis of moving target indication based on distributed space radar[J]. Spacecraft Engineering, 2015, 24(3): 64-68. doi: 10.3969/j.issn. 1673-8748.2015.03.011.

張奔, 鄭堅(jiān), 茅寧杰, 等. 分布式衛(wèi)星InSAR系統(tǒng)的DEM定位方法[J]. 武漢大學(xué)學(xué)報(bào)(工學(xué)版), 2015, 48(6): 852-856. doi: 10.14188/j.1671-8844.2015-06-021.

ZHANG Ben, ZHENG Jian, MAO Ningjie, et al. Research on DEM calculation for distributed satellite InSAR system[J]. Engineering Journal of Wuhan University, 2015, 48(6): 852-856. doi: 10.14188/j.1671-8844.2015-06-021.

張龍, 蘇濤, 劉崢, 等. 分布式小衛(wèi)星聯(lián)合多普勒解模糊SAR成像[J]. 系統(tǒng)工程與電子技術(shù), 2015, 37(3): 544-552. doi: 10.3969/j.issn.1001-506X.2015.03.11.

ZHANG Long, SU Tao, LIU Zheng, et al. Joint Doppler ambiguity removal SAR imaging algorithm for distributed micro-satellite[J]. Systems Engineering and Electronics, 2015, 37(3): 544-552. doi: 10.3969/j.issn.1001-506X.2015.03.11.

陳杰, 周蔭清, 李春升. 分布式SAR小衛(wèi)星編隊(duì)軌道設(shè)計(jì)方法研究[J]. 中國(guó)科學(xué)(E輯), 2004, 34(6): 654-662. doi: 10.3321/j.issn:1006-9275.2004.06.005.

CHEN Jie, ZHOU Yinqing, and LI Chunsheng. Research on orbit design method for the formation flying of distributed small satellites SAR[J]. Science in China (Series E): 2004, 34(6): 654-662. doi: 10.3321/j.issn:1006-9275.2004.06.005.

劉悅. FMCW SAR新體制及信號(hào)處理方法研究[D]. [博士論文], 中國(guó)科學(xué)院電子學(xué)研究所, 2012: 153-168.

LIU Yue. Study on FMCW SAR-configurations and signal processing[D]. [Ph.D. dissertation], Institute of Electronics, Chinese Academy of Sciences, 2012: 153-168.

王穎, 曲長(zhǎng)文, 蘇峰. FMCW SAR雷達(dá)方程[J]. 雷達(dá)科學(xué)與技術(shù), 2008, 6(3): 178-181. doi: 10.3969/j.issn.1672-2337.2008. 03.005.

WANG Ying, QU Changwen, and SU Feng. Radar equation for FMCW SAR[J]. Radar Science and Technology, 2008, 6(3): 178-181. doi: 10.3969/j.issn.1672-2337.2008.03.005.

AHMED N and UNDERWOOD C. Monostatic CW SAR concept for microsatellites[C]. 8th European Conference on Synthetic Aperture Radar, Aachen, Germany, 2010: 14.

LI Y and O'YOUNG S. Focusing bistatic FMCW SAR signal by range migration algorithm based on Fresnel approximation[J]. Sensors, 2015, 15(12): 32123-32137. doi: 10.3390/s151229910.

DE WIT J J M, VAN ROSSUM W L, and DE JONG A J. Orthogonal waveforms for FMCW MIMO radar[C]. IEEE Radar Conference, Kansas City, MO, USA, 2011: 686-691. doi: 10.1109/RADAR.2011.5960625.

WANG Jie, CHEN Longyong, LIANG Xingdong, et al. Multi-input multi-output frequency-modulated continuous wave synthetic aperture radar system using beat-frequency division waveforms[J]. Measurement Science and Technology, 2013, 24(7): 74016-74024. doi: 10.1088/0957-0233/24/7/ 074016.

杜傳紅. 調(diào)頻連續(xù)波SAR成像R-D及算法研究[D]. [碩士論文], 哈爾濱工程大學(xué), 2013: 24-26.

DU Chuanhong. Research of R-D and -k algorithm for frequency modulated continuous wave SAR imaging[D]. [Master dissertation], Harbin Engineering University, 2013: 24-26.

陳龍永, 梁興東, 丁赤飚. 基于交叉接收的空時(shí)頻編碼高分辨率SAR處理方法[J]. 電子與信息學(xué)報(bào), 2010, 32(7): 1668-1673. doi: 10.3724/SP.J.1146.2008.01541.

CHEN Longyong, LIANG Xingdong, and DING Chibiao. A high resolution SAR processing method based on crossed receiving space-time-frequency coding[J]. Journal of Electronics Information Technology, 2010, 32(7): 1668-1673. doi: 10.3724/SP.J.1146.2008.01541.

BELLETTINI A and PINTO M A. Theoretical accuracy of synthetic aperture sonar micronavigation using a displaced phase-center antenna[J]. IEEE Journal of Oceanic Engineering, 2002, 27(4): 780-789. doi: 10.1109/JOE.2002. 805096.

梁毅, 王虹現(xiàn), 邢孟道, 等. 調(diào)頻連續(xù)波SAR信號(hào)分析與成像研究[J]. 電子與信息學(xué)報(bào), 2008, 30(5): 1017-1021. doi: 10.3724/SP.J.1146.2007.00578.

LIANG Yi, WANG Hongxian, XING Mengdao, et al. The analysis of FMCW SAR signal and image study[J]. Journal of Electronics Information Technology, 2008, 30(5): 1017-1021. doi: 10.3724/SP.J.1146.2007.00578.

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