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| 基于两维空变滤波的PFA波前弯曲误差补偿 | |
| 引用本文： | 丁岚,毛新华,朱岱寅.基于两维空变滤波的PFA波前弯曲误差补偿[J].航空学报,2015,36(2):605-613. |
| 作者姓名： | 丁岚 毛新华 朱岱寅 |
| 作者单位： | 1. 南京航空航天大学 雷达成像与微波光子技术教育部重点实验室, 南京 210016; 2. 南京航空航天大学 电子信息工程学院, 南京 210016 |
| 基金项目： | National Natural Science Foundation of China，Natural Science Foundation of Jiangsu Province，Ph.D.Programs Foundation of Ministry of Education of China，国家自然科学基金，江苏省自然科学基金，教育部博士点基金 |
| 摘 要： | 极坐标格式算法(PFA)因受波前弯曲误差的影响,其有效成像场景范围受到一定的限制。采用图像域的空变滤波(SVPF)处理可以有效补偿波前弯曲误差,但为了简化分析,已有SVPF方法在补偿过程中都采取了一定的近似,在对大场景进行高分辨率成像时仍然不能满足聚焦精度要求。对PFA的极坐标格式转换给出了一种新的解析解释,利用该解释推导得到了精确的波前弯曲误差表达式;基于该波前弯曲误差模型,提出了一种基于两维SVPF处理的波前弯曲误差补偿方法。最后通过仿真数据处理验证了该算法的有效性。 |
| 关 键 词： | 合成孔径雷达 极坐标格式算法 波前弯曲误差补偿 空变滤波 两维滤波 |
Polar format algorithm wavefront curvature error compensation using 2D space-variant post-filtering |
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| DING Lan,MAO Xinhua,ZHU Daiyin.Polar format algorithm wavefront curvature error compensation using 2D space-variant post-filtering[J].Acta Aeronautica et Astronautica Sinica,2015,36(2):605-613. | |
| Authors: | DING Lan MAO Xinhua ZHU Daiyin |
| Institution: | 1. Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2. College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
| Abstract: | The space-variant defocus effect introduced by wavefront curvature error in polar format algorithm (PFA) imagery limits its maximal focused scene size. Space-variant post-filtering (SVPF) is an efficient approach to compensate for this error. However, to simplify the analysis, all the existing SVPF methods take some approximation on the wavefront curvature error. They can still not meet the required precision when imaging large area with very high resolution. In this paper, we provide a new analytical interpretation of polar format algorithm and develop the accurate wavefront curvature expression in 2D spatial frequency domain. Base on this accurate expression, a 2D SVPF is proposed to accurately correct the wavefront curvature error. Finally, simulation experiment validates the theoretical analysis. |
| Keywords: | synthetic aperture radar polar format algorithm wavefront curvature error compensation space-variant post-filtering two-dimensional filter |
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