| 引用本文: | 王建,张汉华,周智敏,等.基于因式分解BP的车载前视地表穿透SAR快速成像算法.[J].国防科技大学学报,2009,31(1):74-79.[点击复制] |
| WANG Jian,ZHANG Hanhua,ZHOU Zhimin,et al.Fast Factorized Backprojection Algorithm for Vehicle-mounted Forward-looking Ground Penetrating SAR[J].Journal of National University of Defense Technology,2009,31(1):74-79[点击复制] |
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| 基于因式分解BP的车载前视地表穿透SAR快速成像算法 |
| 王建, 张汉华, 周智敏, 宋千, 金添 |
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(国防科技大学 电子科学与工程学院，湖南 长沙 410073)
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| 摘要: |
| 车载前视地表穿透SAR(VMFL-GPSAR)属于双站SAR的范畴，采用单站快速因式分解BP(FFBP)处理存在较大的误差。针对双站SAR模型分析FFBP的距离误差，给出了极角采样率限制条件，提出了双站FFBP算法，通过合理设置子孔径中心提高聚焦效果，并结合距离相位补偿和线性插值技术，进一步提高聚焦精度。仿真和VMFL-GPSAR实际数据处理结果验证了双站FFBP算法，成像效率可提高2.31倍。 |
| 关键词: 双站 前视 地表穿透合成孔径雷达 快速因式分解后向投影 实时成像 |
| DOI： |
| 投稿日期：2008-04-21 |
| 基金项目: |
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| Fast Factorized Backprojection Algorithm for Vehicle-mounted Forward-looking Ground Penetrating SAR |
| WANG Jian, ZHANG Hanhua, ZHOU Zhimin, SONG Qian, JIN Tian |
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(College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The vehicle-mounted forward-looking ground penetrating SAR(VMFL-GPSAR) is a kind of bistatic SAR. Fast factorized backprojection(FFBP) originally developed for unistatic SAR fails to efficiently form well-focused VMFL-GPSAR image. A bistatic FFBP algorithm is derived after the analysis of the round trip range error of FFBP in VMFL-GPSAR. In the bistatic FFBP, the range error can be reduced by rational subaperture center configuration and by polar angle interval constraint. Besides, by combining range phase compensation and 2D linear interpolation, the bistatic FFBP can perform faster with the same focus precision. Simulation and VMFL-GPSAR raw data processing validate the bistatic FFBP algorithm, achieving a 2.31 times speedup. |
| Keywords: bistatic forward-looking ground penetrating SAR FFBP real-time image formation |
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