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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

李堃, 梁興東, 陳龍永, 王杰, 吳一戎. 基于LFMCW體制的分布式SAR高分辨率成像方法研究[J]. 電子與信息學報, 2017, 39(2): 437-443. doi: 10.11999/JEIT160274
引用本文: 李堃, 梁興東, 陳龍永, 王杰, 吳一戎. 基于LFMCW體制的分布式SAR高分辨率成像方法研究[J]. 電子與信息學報, 2017, 39(2): 437-443. doi: 10.11999/JEIT160274
LI Kun, LIANG Xingdong, CHEN Longyong, WANG Jie, WU Yirong. Signal Model and High-resolution Imaging Approach for Distributed SAR Based on LFMCW Signals[J]. Journal of Electronics & Information Technology, 2017, 39(2): 437-443. doi: 10.11999/JEIT160274
Citation: LI Kun, LIANG Xingdong, CHEN Longyong, WANG Jie, WU Yirong. Signal Model and High-resolution Imaging Approach for Distributed SAR Based on LFMCW Signals[J]. Journal of Electronics & Information Technology, 2017, 39(2): 437-443. 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
  • 2.

    (中國科學院電子學研究所微波成像技術重點實驗室 北京 100190) ②(中國科學院大學 北京 100049)

基金項目: 

國家高技術研究發(fā)展計劃(2013AA122201)，中國科學院國防科技創(chuàng)新基金(CXJJ-16M217)

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: 分布式微小衛(wèi)星SAR是實現(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，實現(xiàn)高分辨率成像是其面臨的關鍵問題之一。該文提出一種利用LFMCW信號實現(xiàn)分布式微小衛(wèi)星平臺SAR的方法，并基于方位向編隊飛行的微小衛(wèi)星構型，對其信號模型與高分辨率成像方法進行了研究。該文方法使用多顆微小衛(wèi)星同時發(fā)射與接收頻分LFMCW信號，利用交叉接收的構型使不同頻帶收發(fā)天線所形成的等效相位中心重合，進而在距離向對信號進行頻帶合成以恢復全帶寬信號，從而實現(xiàn)高分辨率SAR成像。該方法實現(xiàn)了分布式平臺信號的頻帶合成，為高分辨率LFMCW SAR技術在微小衛(wèi)星平臺上的應用提供了理論支撐。仿真實驗驗證了理論分析的正確性以及方法的有效性。
    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.
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  • 文章訪問數(shù):  1224
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  • 被引次數(shù): 0
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

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