高速运动目标斜距三次项补偿及高分辨成像
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摘要
为提高信号的检测性能,需要保持较长的积累时间,这却造成严重的距离徙动。文中针对高速运动目标提出了一种新的高分辨成像算法,在运动参数未精确已知的情况下,通过对多普勒模糊数进行估计和补偿得到正确的二阶Keystone变化结果,在有效估计目标运动参数后,利用驻相原理得到含有斜距三次项的频域相位,并在二维频域进行补偿和聚焦。仿真结果表明,文中算法可以有效对高速微弱目标进行积累和补偿,实现了高分辨成像。
The long integration time required to improve the signal detection performance causes serious range cell migration,and the accurate imaging of weak target is currently achieved by efficient estimation of parameters. In this paper,a new high resolution imaging algorithm is proposed for the high speed moving target. The second-order Keystone variation results are obtained by estimating and compensating the parameters of the motion parameters. The frequency domain phase of the three terms is obtained by using the principle of stationary phase for effective estimation of the target motion parameters. The simulation results show that the algorithm can effectively accumulate and compensate the high speed weak target,and realize high resolution imaging.
The long integration time required to improve the signal detection performance causes serious range cell migration,and the accurate imaging of weak target is currently achieved by efficient estimation of parameters. In this paper,a new high resolution imaging algorithm is proposed for the high speed moving target. The second-order Keystone variation results are obtained by estimating and compensating the parameters of the motion parameters. The frequency domain phase of the three terms is obtained by using the principle of stationary phase for effective estimation of the target motion parameters. The simulation results show that the algorithm can effectively accumulate and compensate the high speed weak target,and realize high resolution imaging.
引文
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[15]Ian G C,Shu Li.Improved slope estimation for SAR doppler ambiguity resolution[J].IEEE Transactions on Geoscience and Remote Sensing,2006,44(3):707-718.
[2]Paulo A,Jose M.Velocity estimation of fast moving targets using a single SAR sensor[J].IEEE Transactions on Aerospace and Electronic Systems,2005,41(1):75-89.
[3]Marques P and Dias J.Imaging of fast moving targets using undersampled SAR raw-date[C].Thessalonoki,Greece:Proceedings of IEEE International Conference on Image Processing,2001.
[4]Marques P,Dias J.Moving target velocity estimation using aliased SAR raw-data from a single sensor[C].Cologne,Germany:Proceedings of European Conference on Synthetic Aperture Radar,2002.
[5]Ruegg M,Meier E,Nuesch D.Capabilities of dual-frequency millimeter wave SAR with monopulse processing for ground moving target indication[J].IEEE Transactions on Geoscience and Remote Sensing,2007,45(3):539-553.
[6]Zhou F,Wu R,Xing M,et al.Approach for single channel SAR ground moving target imaging and motion parameter estimation[J].IET Radar Sonar Navigation,2007,1(1):59-66.
[7]Yang Jungang,Huang Xiaotao,Jin Tian.New approach for SAR imaging of ground moving targets based on a keystone transform[J].IEEE Transactions on Geoscience and Remote Sensing,2011,8(4):829-833.
[8]Zhu Shengqi,Liao Guisheng,Qu Yi.Ground moving targets imaging algorithm for synthetic aperture radar[J].IEEE Transactions on Geoscience and Remote Sensing,2011,49(1):462-477.
[9]Xu Ruipeng,Zhang Dandan,Hu Donghui.A novel motion parameter estimation algorithm of fast moving targets via single-antenna airborne SAR system[J].IEEE Transactions on Geoscience and Remote Sensing,2015(2):329-333.
[10]Yang L,Tao Z,Teng L,et al.Range migration compensation and doppler ambiguity resolution by keystone transform[C].Shanghai:Proceedings of 2006 CIE International Conference on Radar,2006.
[11]Wahl D,Eichel P,Ghiglia D,et al.Phase gradient autofocus—A robust tool for high resolution SAR phase correction[J].IEEE Transactions on Aerospace and Electronic Systems,1994,30(3):827-834.
[12]周鹏,熊涛,周松.一种新的弹载SAR高分辨成像方法[J].电子与信息学报,2011,33(3):622-627.
[13]李燕平,张振华,邢孟道,等.基于级数反演和数值计算的广义双基SAR距离徙动成像算法[J].电子与信息学报,2008,30(12):2800-2804.
[14]Yew L,Frank W,Ian G Cumming.A two-dimensional spectrum for bistatic SAR processing using series reversion[J].IEEE Transactions on Geoscience and Remote Sensing,2007,4(1):93-96.
[15]Ian G C,Shu Li.Improved slope estimation for SAR doppler ambiguity resolution[J].IEEE Transactions on Geoscience and Remote Sensing,2006,44(3):707-718.