基于LFMCW体制的分布式SAR高分辨率成像方法研究

doi:10.11999/JEIT160274

Abstract
Figure/Table
References (16)
Related Citation (15)

Download: PDF (2109 KB)
Export: BibTeX | EndNote (RIS)

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.

Key words： SAR Distributed micro-satellite MIMO LFMCW Sub-band synthesis

Received: 21 March 2016 Published: 16 November 2016

PACS:

TP722.6

Fund:

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

Corresponding Authors: LI Kun E-mail: likun8999@hotmail.com

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LI Kun
	LIANG Xingdong
	CHEN Longyong
	WANG Jie
	WU Yirong

Cite this article:

LI Kun,LIANG Xingdong,CHEN Longyong等. Signal Model and High-resolution Imaging Approach for Distributed SAR Based on LFMCW Signals[J]. JEIT, 2017, 39(2): 437-443.

URL:

http://jeit.ie.ac.cn/EN/10.11999/JEIT160274 OR http://jeit.ie.ac.cn/EN/Y2017/V39/I2/437

[1]	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.
[2]	李晨雷, 刘梅, 赵伯文, 等. 星载分布式SAR地面动目标精确聚焦的互谱MUSIC法[J]. 电子与信息学报, 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.
[3]	李延, 张庆君, 刘亚东, 等. 分布式天基雷达动目标检测性能分析[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.
[4]	张奔, 郑坚, 茅宁杰, 等. 分布式卫星InSAR系统的DEM定位方法[J]. 武汉大学学报(工学版), 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.
[5]	张龙, 苏涛, 刘峥, 等. 分布式小卫星联合多普勒解模糊SAR成像[J]. 系统工程与电子技术, 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.
[6]	陈杰, 周荫清, 李春升. 分布式SAR小卫星编队轨道设计方法研究[J]. 中国科学(E辑), 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.
[7]	刘悦. FMCW SAR新体制及信号处理方法研究[D]. [博士论文], 中国科学院电子学研究所, 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.
[8]	王颖, 曲长文, 苏峰. FMCW SAR雷达方程[J]. 雷达科学与技术, 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.
[9]	AHMED N and UNDERWOOD C. Monostatic CW SAR concept for microsatellites[C]. 8th European Conference on Synthetic Aperture Radar, Aachen, Germany, 2010: 1-4.
[10]	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.
[11]	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.
[12]	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.
[13]	杜传红. 调频连续波SAR成像R-D及算法研究[D]. [硕士论文], 哈尔滨工程大学, 2013: 24-26.
	DU Chuanhong. Research of R-D and ω-k algorithm for frequency modulated continuous wave SAR imaging[D]. [Master dissertation], Harbin Engineering University, 2013: 24-26.
[14]	陈龙永, 梁兴东, 丁赤飚. 基于交叉接收的空时频编码高分辨率SAR处理方法[J]. 电子与信息学报, 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.
[15]	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.
[16]	梁毅, 王虹现, 邢孟道, 等. 调频连续波SAR信号分析与成像研究[J]. 电子与信息学报, 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.