An extended nonlinear chirp scaling algorithm for missile borne SAR imaging
An extended nonlinear chirp scaling algorithm for missile borne SAR imaging
复制标题
弹载SAR成像的扩展非线性线性调频缩放算法
DOI：
10.1016/j.sigpro.2013.12.017
复制
发表时间：
2014-06-01
影响因子：
4.4
通讯作者：
Chen, Yong
中科院分区：
文献类型：
--
作者：
Chen, Si;Zhao, Huichang;Chen, Yong
提出了一种扩展的非线性Chirp Scaling算法，用于弹载合成孔径雷达数据的聚焦。首先建立了弹载SAR信号模型。然后，应用LRWC和SRC操作来减轻回波信号的交叉耦合并聚焦距离信号。最后，一种改进的方位NLCS操作被用来均衡方位频率调制率以实现方位压缩。通过补偿方位调频速率的方位相关特性，并采用高阶近似处理，获得的图像精度高、失真小。整个成像过程仅由快速傅立叶变换和复数乘法组成，不需要插值，实现简单，效率高。仿真结果证明了该算法的准确性和有效性。(C)2013爱思唯尔有限公司版权所有。
In this paper, an extended nonlinear chirp scaling algorithm for focusing missile borne synthetic aperture radar data is proposed. Firstly, a missile borne SAR signal model is built. Then, LRWC and SRC operations are applied to mitigate the echo signal cross coupling and focus the range signal. Finally, a modified azimuth NLCS operation is used to equalize the azimuth frequency modulation rate for azimuth compression. By compensating the azimuth dependent characteristic of the azimuth FM rate and adopting higher order approximation processing, the image acquired has better accuracy and little distortion. The whole imaging procedure only consists of fast Fourier transform and complex multiplication, without interpolation, which means easier implementation and higher efficiency. The simulation results prove the accuracy and efficiency of the proposed algorithm. (C) 2013 Elsevier B.V. All rights reserved.