| 基于坐标变换的合成孔径雷达高精度成像算法 |
| |
| 引用本文： | 邢涛,胡庆荣,李军,王冠勇.基于坐标变换的合成孔径雷达高精度成像算法[J].电波科学学报,2016,31(2):368-375. |
| |
| 作者姓名： | 邢涛 胡庆荣 李军 王冠勇 |
| |
| 作者单位： | 北京无线电测量研究所, 北京 100854 |
| |
| 基金项目： | 国家自然科学基金(61271417) |
| |
| 摘 要： | 针对当前合成孔径雷达成像算法处理低频大斜视角数据存在的散焦和运算量大问题, 提出了一种新的高精度大斜视合成孔径雷达成像算法.算法首先把数据录取坐标系数据变换到零多普勒坐标系数据, 然后在零多普勒坐标系中采用距离时域非均匀傅里叶变换去除距离、方位的耦合, 进而得到聚焦良好的合成孔径雷达图像.算法运算量与距离多普勒算法在一个量级, 具有较高的成像效率.仿真结果表明算法在低频大斜视角下能很好地聚焦, 从而验证了算法的正确性.
|
| 关 键 词： | 合成孔径雷达 高精度 零多普勒坐标系 数据录取坐标系 |
| 收稿时间： | 2015-05-01 |
High precision imaging algorithm for synthetic aperture radar based on coordinate conversion |
| |
| Affiliation: | Beijing Institute of Radio Measurement, Beijing 100854, China |
| |
| Abstract: | New high precision imaging algorithm for low-frequency high squint synthetic aperture radar (SAR) is proposed in this paper for existed SAR algorithms with the problems of defocusing and heavy calculation. The proposed algorithm transforms the SAR data from acquisition Doppler geometry to zero Doppler geometry and then operates ununiform fast Fourier transform (FFT) in range-time domain data to decoupling between range and azimuth. The SAR images focus well after above operations. The computational burden of the proposed algorithm is in the same level as range Doppler(RD) algorithm and has high imaging efficiency. Simulations verify that the proposed algorithm focus well in low frequency high squint SAR. The results demonstrate the correctness of the proposed algorithm. |
| |
| Keywords: | synthetic aperture radar high precision zero Doppler geometry acquisition Doppler geometry |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《电波科学学报》浏览原始摘要信息 |
|
点击此处可从《电波科学学报》下载全文 |
|
