复杂航迹和起伏地形条件下机载聚束SAR 空变运动补偿

doi:CNKI:11-1929/V.20120201.0940.001

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复杂航迹和起伏地形条件下机载聚束SAR 空变运动补偿

毛新华, 朱岱寅, 朱兆达

南京航空航天大学电子与信息工程学院,江苏南京 210016

收稿日期:2011-05-04 修回日期:2011-06-20 出版日期:2012-04-25 发布日期:2012-04-20
通讯作者: 毛新华 E-mail:xinhua@nuaa.edu.cn
基金资助:
国家自然科学基金(61071165);航空科学基金(20102052024);中国博士后科学基金(201003586)

Space-variant Motion Compensation for Airborne Spotlight SAR Under Complicated Flight Path and Rugged Terrain

MAO Xinhua, ZHU Daiyin, ZHU Zhaoda

College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2011-05-04 Revised:2011-06-20 Online:2012-04-25 Published:2012-04-20

摘要/Abstract

摘要： 运动补偿是雷达平台机动飞行条件下合成孔径雷达(SAR)实现精确聚焦成像的前提,而如何精确实现运动误差的空变补偿(误差补偿随目标距离、方位和高度位置的变化而变化)目前还存在很大的挑战。本文提出了一种新的三阶运动补偿方法,能够有效解决复杂雷达航迹和地形起伏条件下运动误差的空变补偿问题。该方法首先以场景中心为参考进行空不变运动补偿,然后以多个子场景中心为参考进行空变运动补偿,最后再利用极坐标格式算法(PFA)统一补偿每个像素的空变误差。仿真数据处理结果验证了本文方法的有效性。

关键词: 合成孔径雷达, 空变运动补偿, 复杂航迹, 起伏地形, 数字聚束

Abstract: Motion compensation is often a prerequisite to get focused synthetic aperture radar (SAR) images with complicated radar platform flight paths. How to implement accurate motion error compensation is still a great challenge, since the error has inherent space-variant property. In this paper, a three-order motion compensation strategy is proposed. The first order compensation corrects the space-invariant motion error by using scene center as a reference. Then, digital spotlight preprocessing is applied to partially compensate the space-variant error. Finally, the residual space-variant error in subpatch is corrected by the polar format algirhtm (PFA). Simulation results show that the proposed method can provide accurate image formation even under conditions of complicated radar flight paths and rugged imaging terrain.

Key words: synthetic aperture radar, space-variant motion compensation, complicated flight path, rugged terrain, digital spotlighting

中图分类号:

V243.2
TP958

毛新华, 朱岱寅, 朱兆达. 复杂航迹和起伏地形条件下机载聚束SAR 空变运动补偿[J]. 航空学报, 2012, (4): 744-754.

MAO Xinhua, ZHU Daiyin, ZHU Zhaoda. Space-variant Motion Compensation for Airborne Spotlight SAR Under Complicated Flight Path and Rugged Terrain[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, (4): 744-754.

参考文献

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

复杂航迹和起伏地形条件下机载聚束SAR 空变运动补偿

Space-variant Motion Compensation for Airborne Spotlight SAR Under Complicated Flight Path and Rugged Terrain

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