A Modified Nonlinear Chirp Scaling Algorithm for Spaceborne/Stationary Bistatic SAR Based on Series Reversion

A Modified Nonlinear Chirp Scaling Algorithm for Spaceborne/Stationary Bistatic SAR Based on Series Reversion
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基于级数反演的改进的星载/静止双基地SAR非线性Chirp缩放算法

DOI:
10.1109/tgrs.2012.2219057
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发表时间:
2013-05
影响因子:
8.2
通讯作者:
Long, T.
Long, T.
中科院分区:
工程技术1区
文献类型:
--
作者:
Zeng, T.;Wang, R.;Li, F.;Long, T.

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提出了一种星载/静止双基地合成孔径雷达(BiSAR)数据聚焦方法。成像的关键问题是多普勒相位的空间方差。静止平台会对目标的距离偏移产生额外的和不同的距离偏移。它使具有相同多普勒历史的目标,仅由运动平台决定,在回波数据中转移到不同的双基地距离单元。因此,该处理与单站SAR成像不同,单站SAR成像可以通过频域均匀匹配滤波函数快速处理。本文提出了一种基于序列反演的改进非线性啁啾缩放(NLCS)算法,该算法可以实现不同距离单元的迁移校正以及有效距离和方位调频速率的均衡。仿真和实际BiSAR数据验证了该算法的有效性。在星载/静止BiSAR实验中,选择遥感一号(中国发射的l波段星载SAR系统)作为发射机,固定接收机安装在高层建筑顶部。结果表明,改进的NLCS算法可以有效地聚焦星载/静止配置中空间方差较大的BiSAR数据。
This paper proposes a method of focusing the bistatic synthetic aperture radar (SAR) (BiSAR) data in spaceborne/stationary configuration. The key problem for imaging is the space variance of Doppler phase. The stationary platform induces additional and different range offsets to the range migration of targets. It causes targets with the same Doppler history, which are determined only by the moving platform, to shift into different bistatic range cells in the echo data. Therefore, the processing is not the same as monostatic SAR imaging which can be fast performed by the uniform matched-filter function in the frequency domain. In this paper, a modified nonlinear chirp scaling (NLCS) algorithm based on series reversion is formulated, which could achieve different range cell migration correction and the equalization of effective range and azimuth frequency modulation rates. The proposed algorithm is validated by simulated and real BiSAR data. In the spaceborne/stationary BiSAR experiment, the YaoGan-1 (an L-band spaceborne SAR system launched by China) is selected as the transmitter, and the stationary receiver is mounted on top of a tall building. The results show that modified NLCS algorithm can effectively focus BiSAR data with serious space variance in spaceborne/stationary configuration.
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