长合成孔径时间多普勒解模糊成像处理算法
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摘要
在SAR过程中,当方位向分辨率要求较高时,往往需要较长的合成孔径时间实现信号的积累。而在实际处理过程中,特别是载机高机动运动时,平台在长合成孔径时间内难以保持理想的匀速直线运动,此时若将数据整体进行多普勒解模糊处理必将导致性能下降。针对这种情况,采用子孔径处理的方法实现长合成孔径时间雷达数据的多普勒解模糊成像,对该算法信号处理流程进行描述,并给出若干组实测数据处理结果。通过实测数据表明,所述算法能有效消除长孔径多普勒模糊问题,提高长孔径SAR图像的图像质量,证明所述算法的有效性和实用性。
In the SAR process,when the azimuth resolution is relatively high,it usually takes longer synthetic aperture time to achieve signal accumulation. In the actual processing,especially in the high maneuvering motion,it is difficult to maintain an ideal uniform linear motion in long synthetic aperture time. In this case,the paper uses the method of sub-aperture processing to solve the Doppler ambiguity and achieve imaging of the long synthetic aperture radar data.In this paper,the signal processing flow of the algorithm is described,and some data processing results are given.The live data processing results show that the proposed approach can solve the Doppler ambiguity of the long SAR data and obtain a high quality image of the long SAR data.The experimental results verify the validity and practicability of the proposed method.
In the SAR process,when the azimuth resolution is relatively high,it usually takes longer synthetic aperture time to achieve signal accumulation. In the actual processing,especially in the high maneuvering motion,it is difficult to maintain an ideal uniform linear motion in long synthetic aperture time. In this case,the paper uses the method of sub-aperture processing to solve the Doppler ambiguity and achieve imaging of the long synthetic aperture radar data.In this paper,the signal processing flow of the algorithm is described,and some data processing results are given.The live data processing results show that the proposed approach can solve the Doppler ambiguity of the long SAR data and obtain a high quality image of the long SAR data.The experimental results verify the validity and practicability of the proposed method.
引文
[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.
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[5]张双喜.高分辨宽测绘带多通道SAR和动目标成像理论与方法[D].西安:西安电子科技大学,2014.
[6]侯育星.高分辨宽测绘带SAR成像及算法性能提升研究[D].西安:西安电子科技大学,2015.
[7] ZHANG Z,WANG Z S.On Suppressing Azimuth Ambiguities of Synthetic Aperture Radar by Three Filters[C]∥Radar, 2001 CIE International Conference on,Proceedings,IEEE,2001:624-626.
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[9] GUARNIERI A M.Adaptive Removal of Azimuth Ambiguities in SAR Images[J].IEEE Transactions on Geoscience&Remote Sensing,2005,43(3):625-633.
[10] TONG Wang,ZHENG Bao.Improving the Image Quality of Spaceborne Multiple-aperture SAR under Minimization of Sidelobe Clutter and Noise[J].IEEE Geoscience and Remote Sensing Letters,2009(1):42-46.
[11] GEBERT N. Multi-channel Azimuth Processing for HighResolution Wide-swath SAR Imaging[C]∥DLR Deutsches Zentrum fur Luftund Raumfahrte. V.-Forschungsberichte,2009:43-69.
[12] KRIEGER G,CASSOLA M R,YOUNIS M,et al.Impact of Oscillator Noise in Bistatic and Multistatic SAR[C]∥Geoscience and Remote Sensing Symposium,IGARSS’05.Proceedings,2005 IEEE International,IEEE,2005:1043-1046.
[13]周红,娄军,黄晓涛,等.多子带STAP方法的角度模糊抑制性能分析[J].信号处理,2010,26(12):1774-1781.
[14] AUSHERMAND A,KOZMA A,WALKER J,et al.Developments in Radar Imaging[J]. IEEE Trans. on Aerosp.Electron.Syst.,1984,20(4):363-399.
[15] TSAIG Y,DONOHO D L. Extensions of Compressed Sensing[J].Signal Processing,2006,86(3):549-571.
[16]孙进平,洪文,柳成堪,等,条带模式合成孔径雷达回波数据的聚束成像算法处理[J].航空学报增刊,2001(22):80-83.
[2] CUMMINGI,WONG F.Digital Processing of Synthetic Aperture Radar Data-Algorithms and Implementation[M].Boston:Artech House,2005.
[3] SHERWIN C W,RUINA J P,RAWCLIFFE R D. Some Early Developments in Synthetic Aperture Radar Systems[J]. IRE Transactions on Military Electronics,1962,6(2):111-115.
[4]侯育星,张磊,徐刚,等.脉冲相位编码信号大测绘带合成孔径雷达成像[J].西安电子科技大学学报,2012,39(5):54-60.
[5]张双喜.高分辨宽测绘带多通道SAR和动目标成像理论与方法[D].西安:西安电子科技大学,2014.
[6]侯育星.高分辨宽测绘带SAR成像及算法性能提升研究[D].西安:西安电子科技大学,2015.
[7] ZHANG Z,WANG Z S.On Suppressing Azimuth Ambiguities of Synthetic Aperture Radar by Three Filters[C]∥Radar, 2001 CIE International Conference on,Proceedings,IEEE,2001:624-626.
[8] GOODMAN N A, BRUYERE D. Optimum and Decentralized Detection for Multistatic Airborne Radar[J].Aerospace&Electronic Systems IEEE Transactions on,2007,43(2):806-813.
[9] GUARNIERI A M.Adaptive Removal of Azimuth Ambiguities in SAR Images[J].IEEE Transactions on Geoscience&Remote Sensing,2005,43(3):625-633.
[10] TONG Wang,ZHENG Bao.Improving the Image Quality of Spaceborne Multiple-aperture SAR under Minimization of Sidelobe Clutter and Noise[J].IEEE Geoscience and Remote Sensing Letters,2009(1):42-46.
[11] GEBERT N. Multi-channel Azimuth Processing for HighResolution Wide-swath SAR Imaging[C]∥DLR Deutsches Zentrum fur Luftund Raumfahrte. V.-Forschungsberichte,2009:43-69.
[12] KRIEGER G,CASSOLA M R,YOUNIS M,et al.Impact of Oscillator Noise in Bistatic and Multistatic SAR[C]∥Geoscience and Remote Sensing Symposium,IGARSS’05.Proceedings,2005 IEEE International,IEEE,2005:1043-1046.
[13]周红,娄军,黄晓涛,等.多子带STAP方法的角度模糊抑制性能分析[J].信号处理,2010,26(12):1774-1781.
[14] AUSHERMAND A,KOZMA A,WALKER J,et al.Developments in Radar Imaging[J]. IEEE Trans. on Aerosp.Electron.Syst.,1984,20(4):363-399.
[15] TSAIG Y,DONOHO D L. Extensions of Compressed Sensing[J].Signal Processing,2006,86(3):549-571.
[16]孙进平,洪文,柳成堪,等,条带模式合成孔径雷达回波数据的聚束成像算法处理[J].航空学报增刊,2001(22):80-83.