一种俯冲段子孔径SAR大斜视成像及几何校正方法

李震宇; 梁毅; 邢孟道; 保铮

doi:10.11999/JEIT141516

一种俯冲段子孔径SAR大斜视成像及几何校正方法

doi: 10.11999/JEIT141516

基金项目:

国家自然科学青年基金(61101245)和中央高校基本科研业务费专项资金(K5051302046)

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- 被引次数: 0
出版历程
- 收稿日期: 2014-11-27
- 修回日期: 2015-03-27
- 刊出日期: 2015-08-19

New Subaperture Imaging Algorithm and Geometric Correction Method for High Squint Diving SAR Based on Equivalent Squint Model

摘要

摘要: 俯冲合成孔径雷达(SAR)成像由于垂直向下速度的存在，使得沿水平飞行方向不再满足平移不变性，导致常规全孔径成像算法无法直接运用于俯冲段的大斜视子孔径成像。针对这些问题，该文基于俯冲等效平飞模型以及子孔径成像特性提出一种俯冲段子孔径SAR大斜视成像算法频域相位滤波算法(FPFA)。其创新思想是通过方位频域引入滤波因子校正方位空变。由于俯冲等效平飞模型会造成成像平面的旋转，引起较大的图像畸变，为了解决该问题，该文进一步提出一种基于反向投影的快速几何校正方法，得到近似无畸变或畸变较小的地距图像。仿真和实测数据处理验证该文成像方法和几何校正方法的有效性。
- 俯冲合成孔径雷达 /
- 子孔径 /
- 频域相位滤波算法 /
- 反向投影 /
- 几何校正
Abstract: The ordinary full-aperture SAR imaging algorithms are inapplicable to focus high squint diving SAR subaperture data due to its property of vertical velocity which brings variance in azimuth. Based on the equivalent squint model and the characteristic of subaperture imaging, this paper explores a Frequency Phase Filtering Algorithm (FPFA) to implement high squint SAR subaperture data focusing. The innovative idea is the introduced filtering phase in the azimuth frequency domain in order to eliminate the azimuth dependence. Finally, the equivalent squint model causes the geometric deformation; due to this issue, a modified inverse-projection method corresponding to FPFA is proposed to get the final image without deformation. The simulation results and raw data processing validate the effectiveness of the proposed method.
- Diving SAR /
- Subaperture /
- Frequency Phase Filtering Algorithm (FPFA) /
- Inverse-projection /
- Geometric correction

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参考文献(24)

保铮, 邢孟道, 王彤. 雷达成像技术[M]. 北京: 电子工业出版社, 2005: 90-100.

秦玉亮, 黄宗辉, 邓彬. INS/双天线弹载SAR组合弹体定位技术[J]. 电子学报, 2009, 37(6): 1216-1221.

Qin Yu-liang, Huang Zong-hui, and Deng Bin. Missile geo location using INS and dual-antenna missile-borne SAR[J]. Acta Electronica Sinica, 2009, 37(6): 1216-1221.

俞根苗, 尚勇, 邓海涛, 等. 弹载侧视合成孔径雷达信号分析及成像研究[J]. 电子学报, 2005, 33(5): 778-782.

Yu Gen-miao, Shang Yong, Deng Hai-tao, et al.. Signal analysis and imaging processing of missile-borne side-looking SAR[J]. Acta Electronica Sinica, 2005, 33(5): 778-782.

肖忠源, 徐华平, 李春生. 基于俯冲模型的频域距离走动校正NLCS-SAR成像算法[J]. 电子与信息学报, 2013, 35(5): 1090-1096.

Xiao Zhong-yuan, Xu Hua-ping, and Li Chun-sheng. NLCS-SAR imaging algorithm with range-walk correction in frequency domain based on dive model[J]. Journal of Electronics Information Technology, 2013, 35(5): 1090-1096.

周鹏, 周松, 熊涛, 等. 基于级数反演的弹载SAR下降段CZT成像算法[J]. 电子与信息学报, 2010, 32(12): 2861-2867.

Zhou Peng, Zhou Song, Xiong Tao, et al.. A Chirp-Z imaging algorithm for missile-borne SAR with diving maneuver based on the method of series reversion[J]. Journal of Electronics Information Technology, 2010, 32(12): 2861-2867.

周松, 周鹏, 李亚超, 等. 弹载SAR下降段成像算法[J]. 西安电子科技大学学报, 2011, 38(3): 90-98.

Zhou Song, Zhou Peng, Li Ya-chao, et al.. Research on the imaging algorithm for missile-borne SAR with downward movement[J]. Journal of Xidian University, 2011, 38(3): 90-98.

Tang Shi-yang, Zhang Lin-rang, Guo Ping, et al.. An Omega-K algorithm for highly squinted missile-borne SAR with constant acceleration[J]. IEEE Geoscience and Remote Sensing Letters, 2014, 9(11): 1569-1573.

周松, 包敏, 周鹏, 等. 基于方位非线性变标的弹载SAR下降段成像算法[J]. 电子与信息学报, 2011, 33(6): 1420-1426.

Zhou Song, Bao Min, Zhou Peng, et al.. Imaging algorithm for missile-borne SAR with downward movement based on azimuth nonlinear chirp scaling[J]. Journal of Electronics Information Technology, 2011, 33(6): 1420-1426.

Sun Guang-cai, Jiang Xiu-wei, Xing Meng-dao, et al.. Focus improvement of highly squinted data based on azimuth nonlinear scaling[J]. IEEE Transactions on Geoscience and Remote Sensing, 2011, 49(6): 2308-2322.

Wang Wei, Liao Gui-sheng, Li Dong, et al.. Focus improvement of squint bistatic SAR data using azimuth nonlinear chirp scaling[J]. IEEE Geoscience and Remote Sensing Letters, 2014, 11(1): 229-234.

An Dao-xiang, Huang Xiao-tao, Jin Tian, et al.. Extended nonlinear chirp scaling algorithm for high-resolution highly squint SAR data focusing[J]. IEEE Transactions on Geoscience and Remote Sensing, 2012, 50(9): 3595-3609.

Li Dong, Liao Gui-sheng, Wang Wei, et al.. Extended azimuth nonlinear chirp scaling algorithm for bistatic SAR processing in high-resolution highly squinted mode[J]. IEEE Geoscience and Remote Sensing Letters, 2014, 11(6): 1134-1139.

Tang Yu, Zhang Bo, Xing Meng-dao, et al.. The space-variant phase-error matching map-drift algorithm for highly squinted SAR[J]. IEEE Geoscience and Remote Sensing Letters, 2013, 10(4): 845-849.

Liu Gao-gao, Li Peng, Tang Shi-yang, et al.. Focusing highly squinted data with motion errors based on modified non-linear chirp scaling[J]. IET Radar, Sonar Navigation, 2013, 7(5): 568-578.

李震宇, 杨军, 梁毅, 等. 弹载SAR子孔径大斜视成像方位空变校正新方法[J]. 西安电子科技大学学报, 2015, 42(4): 99-105.

Li Zhen-yu, Yang Jun, Liang Yi, et al.. New method for azimuth-dependent correction of the highly squinted missile-borne SAR subaperture imaging[J]. Journal of Xidian University, 2015, 42(4): 99-105.

李学仕, 梁毅, 李蓓蕾, 等. 基于SPECAN处理的斜视SAR实时成像算法及其实现[J]. 系统工程与电子技术, 2011, 33(12): 2618-2622.

Li Xue-shi, Liang Yi, Li Bei-lei, et al.. Real-time imaging processing algorithm for squint SAR based on SPECAN processing and its implement in FPGA[J]. Systems Engineering and Electronics, 2011, 33(12): 2618-2622.

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