一种用于TOPS SAR-GMTI的空时自适应处理方法

doi:10.3969/j.issn.1001-2400.2015.01.001

Abstract

Abstract:

Moving targets detection and imaging for multichannel terrain observation by progressive scans (TOPS) synthetic aperture radar ground moving targets indication (SAR-GMTI) has important application prospects. However, the azimuth bandwidth of the background clutter is much larger than the instantaneous signal bandwidth. Therefore, the background clutter will be highly aliased if the pulse repetition frequency (PRF) is limited. Direct application of space-time adaptive processing (STAP) techniques will significantly compromise the clutter suppression performance. Hence, we propose a space-time adaptive processing method based on spectrum compression. The spectrum compression process can reduce the azimuth bandwidth of the background clutter to the instantaneous signal bandwidth. Space-time adaptive processing is then performed to effectively suppress the clutter, and the clutter suppression performance is greatly improved. Furthermore, Deramp processing is used to focus the moving target in order to avoid the target ambiguities arising from the Doppler shift. Meanwhile, we can perform the moving targets tracking by utilizing the highly overlapping full-aperture images which are obtained by the TOPS SAR mode. Simulation results validate the effectiveness of the proposed algorithm.

Key words: moving target imaging, moving target tracking, space-time adaptive processing(STAP), spectrum compression

LI Xueshi;XING Mengdao;SHAO Peng;SUN Guangcai;LIANG Yi;BAO Zheng. Spectrum compression space-time adaptive processing method for TOPS SAR-GMTI[J].J4, 2015, 42(1): 1-9.

References

［1］ Pitz W, Miller D. The TerraSAR-X Satellite ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2010, 48(2): 615-622.
［2］ Gebert N, Krieger G, Moreira A. Multichannel Azimuth Processing in ScanSAR and TOPS Mode Operation ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2010, 48(7): 2994-3008.
［3］ Brusch S, Lehner S, Fritz T M, et al. Ship Surveillance with TerraSAR-X ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2011, 49(3): 1092-1103.
［4］ Sun G C, Xing M D, Xia X G, et al. Multichannel Full-aperture Azimuth Processing for Beam Steering SAR ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2013, 51(9): 4761-4778.
［5］ An D X, Huang X T, Jin T, et al. Extended Two-step Focusing Approach for Squinted Spotlight SAR Imaging ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2012, 50(7): 2889-2900.
［6］井伟, 张磊, 邢孟道, 等. 聚束式SAR的宽场景成像算法［J］.电子学报, 2009, 37(3): 470-475.
Jing Wei, Zhang Lei, Xing Mengdao, et al. Algorithm for Wide-swath Spotlight SAR Data Processing ［J］. Acta Electronica Sinica, 2009, 37(3): 470-475.
［7］常玉林, 周红, 黄晓涛, 等. 多通道SAR 频率多普勒域宽带长CPI STAP 方法［J］. 电子学报, 2011, 39(6): 1245-1252.
Chang Yulin, Zhou Hong, Huang Xiaotao, et al. Frequency-Doppler Domain Wideband Long CPI STAP Method for Multichannel SAR System ［J］. Acta Electronica Sinica, 2011, 39(6): 1245-1252.
［8］ Cristallini D, Pastina D, Colone F, et al. Efficient Detection and Imaging of Moving Targets in SAR Images Based on Chirp Scaling ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2013, 51(4): 2403-2416.
［9］ Sun G C, Xing M D, Xia X G, et al. Robust Ground Moving Target Imaging Using Deramp-keystone Processing ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2013, 51(2): 966-982.
［10］邓云凯, 刘亚东, 行坤, 等. 一种结合时频分析与 Dechirp 技术提高运动目标参数估计精度的多通道方法［J］.电子与信息学报, 2011, 33(1): 14-20.
Deng Yunkai, Liu Yadong, Xing Kun, et al. A High Accurate Method of Estimating Moving Target's Parameters Using Time-frequency Analysis and Dechirp Technology with Multi-channel ［J］. Journal of Electronics ＆ Information Technology, 2011, 33(1): 14-20.
［11］ Dragosevic M V, Burwash W, Chiu S. Detection and Estimation with RADARSAT-2 Moving-object Detection Experiment Modes ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2012, 50(9): 3527-3543.
［12］ Cerutti-Maori D, Sikaneta I, Gierull C. H. Optimum SAR/GMTI Processing and Its Application to the Radar Satellite RADARSAT-2 for Traffic Monitoring ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2012, 50(10): 3868-3881.

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Spectrum compression space-time adaptive processing method for TOPS SAR-GMTI

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