In addition to the bulk motion induced by constant velocity or uniform acceleration, the target or any structure on it may undergo micro-motion dynamics, such as mechanical rocking, vibrations, or rotations.The traditional range model approximated by second-order polynomials is not suitable for describing the range from a radar to the micro-motion targets.In this paper, combining with Paired Echo Principle and Range-Doppler(R-D) algorithm in synthetic aperture radar(SAR), we derive the vector expression which indicates the multi-channel echo of the ground moving micro-motion target in image domain on the basis of setting up its geometrical model, and analyze the azimuth defocusing in single-channel and the interferometric phase between channels induced by micro Doppler.The normalization of the amplitude of the echo of different ghost points and the correlation coefficient of the spatial steering vectors between each ghost point and clutter are introduced.The result of simulation demonstrates that making use of the ghost points to detect the ground moving target has good improvement factor in strong clutter background.
晏艺翡, 廖桂生, 杨志伟. 一种利用目标微动特性提高SAR-MMTI检测性能的方法[J]. 电子学报, 2015, 43(6): 1050-1057.
YAN Yi-fei, LIAO Gui-sheng, YANG Zhi-wei. A Method for Improving SAR-MMTI Performance Based on Micro-motion Features. Chinese Journal of Electronics, 2015, 43(6): 1050-1057.
[1] 保铮, 邢孟道, 王彤.雷达成像技术[M].北京:电子工业出版社, 2005.
[2] Ender J H G.Detection and estimation of moving target signals by multi-channel SAR[J].Aeu-Archiv fur Elektronik und Ubertragungstechnik-International Journal of Electronics and Communacations, 1996, 50(2):150-156.
[3] Perry R P, Dipietro R C, Fante R.SAR imaging of moving targets[J].Aerospace and Electronic Systems, IEEE Transactions on, 1999, 35(1):188-200.
[4] Nohara T J.Comparison of DPCA and STAP for space-based radar[A].Radar Conference, 1995, Record of the IEEE 1995 International[C].Alexandria, VA:IEEE, 1995.113-119.
[5] Chapin E, Chen C W.Along-track interferometry for ground moving target indication[J].Aerospace and Electronic Systems Magazine, IEEE, 2008, 23(6):19-24.
[6] Melvin W L.A stap overview[J].Aerospace and Electronic Systems Magazine, IEEE, 2004, 19(1):19-35.
[7] Chen V C, Li F, Ho S S, et al.Micro-Doppler effect in radar:phenomenon, model, and simulation study[J].Aerospace and Electronic Systems, IEEE Transactions on, 2006, 42(1):2-21.
[8] Li X, Deng B, Qin Y, et al.The influence of target micromotion on SAR and GMTI[J].Geoscience and Remote Sensing, IEEE Transactions on, 2011, 49(7):2738-2751.
[9] Chen Y B, Deng B, Wang H Q, et al.Vibration target detection and vibration parameters estimation based on the DPCA technique in dual-channel SAR[J].Science China Information Sciences, 2012, 55(10):2281-2291.
[10] Zhang W, Tong C.Micro-Doppler extraction of vibrating target based on dual-channel ATI technique in SAR[A].Zhang Q.2010 Second IITA International Conference on Geoscience and Remote Sensing (IITA-GRS)[C].Qingdao:IEEE, 2010.422-425.
[11] Zhang W, Tong C.Bistatic micro-Doppler radar signatures of vibrating targets with along-track interferometry[A].Ren L.IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies for Wireless Communications[C].Beijing:IEEE, 2011.505-508.
[12] 曹志刚, 钱亚生.现代通信原理[M].北京:清华大学出版社, 2002.
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