基于局部直角坐标和子区域处理的弹载SAR频域成像算法

别博文; 孙路; 邢孟道; 梁毅; 孙光才

doi:10.11999/JEIT171107

基于局部直角坐标和子区域处理的弹载SAR频域成像算法

doi: 10.11999/JEIT171107

别博文^{*①②孙路},
孙路,
邢孟道,
梁毅,
孙光才

基金项目:

国家自然科学基金(61621005), 高分辨率对地观测系统重大专项(41-Y20A13-9001-15116)

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出版历程
- 收稿日期: 2017-11-24
- 修回日期: 2018-04-16
- 刊出日期: 2018-08-19

A Frequency-domain Algorithm Based on Local Cartesian Coordinate and Subregion Processing for Missile-borne SAR Imaging

Funds:

The National Natural Science Foundation of China (61621005), The High Resolution Earth Observation System major Project (41-Y20A13-9001-15116)

摘要

摘要: 针对弹载SAR平台非直线轨迹运动和大斜视成像的特点，该文提出一种基于局部直角坐标和子区域处理的频域成像算法。对大斜视成像模式，采用局部直角坐标系建模的方法，使距离走动校正后的方位信号具有更高的近似精度；为精确补偿包络和相位的方位空变，采用子区域成像的方式，可显著提高场景边缘处的聚焦质量；将各子区域图像校正至统一的地面坐标系下，即可得到最终的SAR图像。点目标仿真和实测数据验证了所提算法的有效性。
- 合成孔径雷达 /
- 局部直角坐标 /
- 子区域处理 /
- 非直线轨迹 /
- 大斜视
Abstract: The missile-borne SAR platform has the characteristics of nonlinear trajectory and high-squint mode. A frequency-domain imaging algorithm based on local Cartesian coordinate and subregion processing is proposed. For high-squint mode, the range model is built in local Cartesian coordinate to match accurately the azimuth signal after range walk correction. To compensate the azimuth-dependent range cell migration and Doppler parameters accurately, the imaging area is divided into several subregions. The final focused image can be obtained when all the subregion images are interpolated uniformly into the ground coordinate. Finally, the point targets simulation and real SAR data verify the effectiveness of the proposed algorithm.
- SAR /
- Local Cartesian coordinate /
- Subregion processing /
- Nonlinear trajectory /
- High-squint

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参考文献(16)

CUMMING I G and FRANK H W. Digital Processing of Synthetic Aperture Radar Data[M]. Washington DC: Artech House, 2005: 1-30.

保铮, 邢孟道, 王彤. 雷达成像技术[M]. 北京: 电子工业出版社, 2005: 9.

LIANG Y, LI Zhenyu, ZENG Letian, et al. A high-order phase correction approach for focusing HS-SAR small- aperture data of high-speed moving platforms[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2015, 8(9): 4551-4561. doi: 10.1109/ JSTARS.2015.2459765.

李震宇, 陈溅来, 梁毅, 等. 带有多普勒中心空变校正的大斜视SAR成像方法[J]. 西安电子科技大学学报(自然科学版), 2016, 43(3): 19-24. doi: 10.3969/j.issn.1001-2400.2016.03.004. LI Zhenyu, CHEN Jianlai, LIANG Yi, et al. Imaging method for highly squinted SAR with spatially-variant Doppler centroid correction[J]. Journal of Xidian University (Natural Science), 2016, 43(3): 19-24. doi: 10.3969/j.issn.1001-2400. 2016.03.004.

LI Zhenyu, LIANG Yi, XIMG Mengdao, et al. Focusing of highly squinted SAR data with frequency nonlinear chirp scaling[J]. IEEE Geoscience and Remote Sensing Letters, 2016, 13(1): 23-27. doi: 10.1109/LGRS.2015.2492681.

怀园园, 梁毅, 李震宇, 等. 一种基于方位谱重采样的大斜视子孔径SAR成像改进Omega-K算法[J]. 电子与信息学报, 2015, 37(7): 1743-1750. doi: 10.11999/JEIT141383. HUAI Yuanyuan, LIANG Yi, LI Zhenyu, et al. Modified Omega-K algorithm for sub-aperture high squint SAR imaging based on azimuth resampling[J]. Journal of Electronics Information Technology, 2015, 37(7): 1743-1750. doi: 10.11999/JEIT141383.

LIANG Yi, HUAI Yuanyuan, DING Jinshan, et al. A modified algorithm for HS-SAR small-aperture data imaging[J]. IEEE Transactions on Geoscience and Remote Sensing, 2016, 54(6): 3710-3721. doi: 10.1109/TGRS.2016. 2525787.

LI Zhenyu, XING Mengdao, LIANG Yi, et al. A frequency- domain imaging algorithm for highly squinted SAR mounted on maneuvering platforms with nonlinear trajectory[J]. IEEE Transactions on Geoscience and Remote Sensing, 2016, 54(7): 4023-4038. doi: 10.1109/TGRS.2016.2535391.

ZENG Tao, LI Yinghe, DING Zegang, et al. Subaperture approach based on azimuth-dependent range cell migration correction and azimuth focusing parameter equalization for maneuvering high-squint-mode SAR[J]. IEEE Transactions on Geoscience and Remote Sensing, 2015, 53(12): 6718-6734. doi: 10.1109/TGRS.2015.2447393.

LI Zhenyu, XING Mengdao, XING Wenjie, et al. A modified equivalent range model and wavenumber-domain imaging approach for high-resolution-high-squint SAR with curved trajectory[J]. IEEE Transactions on Geoscience and Remote Sensing, 2017, 55(7): 3721-3734. doi: 10.1109/TGRS.2017. 2678763.

LI Zhenyu, LIANG Yi, XING Mengdao, et al. An improved range model and omega-K-based imaging algorithm for high-squint SAR with curved trajectory and constant acceleration[J]. IEEE Geoscience and Remote Sensing Letters, 2016, 13(5): 656-660. doi: 10.1109/LGRS.2016.2533631.

江淮, 陈思, 赵惠昌, 等. 一种弹载SAR子孔径成像算法[J]. 电子与信息学报, 2017, 39(10): 2526-2530. doi: 10.11999/ JEIT161337. JIANG Huai, CHEN Si, ZHAO Huichang, et al. Subaperture imaging algorithm for missile-borne SAR[J]. Journal of Electronics Information Technology, 2017, 39(10): 2526-2530. doi: 10.11999/JEIT161337.

李震宇, 梁毅, 邢孟道, 等. 弹载合成孔径雷达大斜视子孔径频域相位滤波成像算法[J].电子与信息学报, 2015, 37(4): 953-960. doi: 10.11999/JEIT140618. LI Zhenyu, LIANG Yi, XING Mengdao, et al. A frequency phase filtering imaging algorithm for highly squint missile-borne synthetic aperture radar with subaperture[J]. Journal of Electronics Information Technology, 2015, 37(4): 953-960. doi: 10.11999/JEIT140618.

TANG Shiyang, ZHANG Linrang, 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, 11(9): 1569-1573. doi: 10.1109/LGRS. 2014.2301718.

SUN Guangcai, XING Mengdao, WANG Yong, et al. A 2-D space-variant chirp scaling algorithm based on the RCM equalization and subband synthesis to process geosynchronous SAR data[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(8): 4868-4880. doi: 10.1109/TGRS.2013.2285721.

NEO Y L, FRANK W, and CUMMING I G. A two-dimensional spectrum for bistatic SAR processing using series reversion[J]. IEEE Geoscience and Remote Sensing Letters, 2007, 4(1): 93-96. doi: 10.1109/LGRS.2006.885862.

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