一种二维频域SAR回波仿真的改进方法

doi:10.3969/j.issn.1001-2400.2013.03.007

J4 ›› 2013, Vol. 40 ›› Issue (3): 42-49+56.doi: 10.3969/j.issn.1001-2400.2013.03.007

一种二维频域SAR回波仿真的改进方法

刘向阳¹;曾操²;王静³;赵卫伟¹

(1. 西安通信学院，陕西西安 710106；
2. 西安电子科技大学雷达信号处理国家重点实验室，陕西西安 710071;
3. 长安大学信息工程学院，陕西西安 710064)

收稿日期:2012-07-11 出版日期:2013-06-20 发布日期:2013-07-29
通讯作者: 刘向阳
作者简介:刘向阳(1982-)，男，博士，E-mail: xiangyangliu@mail.xidian.edu.cn．
基金资助:
国家自然科学基金资助项目(61101243,61102160);陕西省自然科学基金资助项目(2011JQ8036);长安大学中央高校基金资助项目(CHD2012ZD005)

Improved method for SAR echo signal simulation using two-dimensional frequency domain transformation

LIU Xiangyang¹;ZENG Cao²;WANG Jing³;ZHAO Weiwei¹

(1. Xi'an Communication Institute, Xi'an 710106， China;
2. National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071， China;
3. School of Information Engineering, Chang'an Univ., Xi'an 710064， China)

Received:2012-07-11 Online:2013-06-20 Published:2013-07-29
Contact: LIU Xiangyang

摘要/Abstract

摘要：

合成孔径雷达(SAR)回波仿真是研究SAR信号处理的基础，其中运算量大是常用回波仿真方法的主要缺点．利用Stolt变换可以模拟SAR距离徙动空变性的思想，IωKA在二维频率域实现了扩展场景回波信号的快速仿真，显著降低了计算量和运算时间．分析表明，该方法的关键是Stolt变换时的插值操作，与ωKA成像算法中信号插值不同的是，IωKA插值前的信号是严格意义上的带限信号，进而影响到插值算法选择和插值性能．本文通过对待插值信号的预处理，将其转化为严格意义上的基带带限信号，提高了插值性能，降低了插值操作的复杂性，增强了适用范围．实验表明，如果将仿真中引入的误差看做噪声，该仿真误差远小于系统噪声．而且，与其他二维频域方法相比，实现了较高的相位和幅度保真度，且适用于正侧视、小斜视、大斜视和宽波束等各种模式．

关键词: 合成孔径雷达(SAR), 回波信号仿真, Stolt变换, IωKA

Abstract:

The echo signal simulation of Synthetic Aperture Radar (SAR) is the basis of the research on SAR signal processing, and the large computation cost is the primary shortcomings of the frequently-used echo signal simulation method. Using the theory that Stolt transformation can simulate the so-called space-varying property of range migration, the IωKA algorithm becomes an impressive fast echo signal simulation method for the extended scenes in the two-dimensional frequency domain, and the computational cost and operation time is cut down sharply. According to the analysis, the key to the IωKA algorithm is the interpolation for the Stolt transformation, and the signal before interpolation in the IωKA algorithm can be seen as a band-limited signal in the strict sense, which is greatly different from that in the ωKA algorithm and may has a great effect on the selection of the interpolation algorithm and the interpolation performance. By preprocessing, the signal before interpolation in the IωKA algorithm is transformed into a baseband band-limited signal in the strict sense, which improves the interpolation performance, reduces the complexity of the interpolation, and enlarges the application range of the algorithm. Experimental result shows that if the error introduced by the simulation is regarded as noise, the error level of our method is much less than the system noise. Also, Compared with the other 2-D frequency-domain simulation methods, this method has a small amplitude error and phase error, and could be applied to the whole strip mode SAR with varieties of squint angles and wide-beam.

Key words: synthetic aperture radar (SAR), echo signal simulation, Stolt transformation, inversion ωK algorithm

中图分类号:

TN959.3

刘向阳;曾操;王静;赵卫伟. 一种二维频域SAR回波仿真的改进方法[J]. J4, 2013, 40(3): 42-49+56.

LIU Xiangyang;ZENG Cao;WANG Jing;ZHAO Weiwei. Improved method for SAR echo signal simulation using two-dimensional frequency domain transformation[J]. J4, 2013, 40(3): 42-49+56.

参考文献

［1］ Cumming I G, Wong F H. 合成孔径雷达成像——算法与实现［M］. 洪文, 胡东辉, 等, 译. 北京: 电子工业出版社, 2007.
［2］侯育星, 张磊, 徐刚, 等. 脉冲相位编码信号大测绘带合成孔径雷达成像［J］. 西安电子科技大学学报, 2012, 39(5): 54-60.
Hou Yuxing, Zhang Lei, Xu Gang, et al. Wide Swath SAR Imaging with Pulse-phase-codes ［J］. Journal of Xidian University, 2012, 39(5): 54-60.
［3］陈杰, 周荫清, 李春升. 星载SAR自然地面场景仿真方法研究［J］. 电子学报, 2001, 21(9): 1202-1205.
Chen Jie, Zhou Yinqing, Li Chunsheng. Spaceborne Synthetic Aperture Radar Image Simulation of Natual Ground Scene ［J］. ACTA Electronica Sinica, 2001, 21(9): 1202-1205.
［4］韦立登, 李绍恩, 吴一戎, 等. SAR原始回波信号生成算法的性能比较研究［J］. 电子与信息学报, 2005, 27(2): 262-265.
Wei Lideng, Li Shaoen, Wu Yirong, et al. Performance Comparison of Algorithms for SAR Raw Signal Generation ［J］. Journal of Electronics ＆ Information Technology, 2005, 27(2): 262-265.
［5］王虹现, 全英汇, 邢孟道, 等. 基于FPGA的SAR回波仿真快速实现方法［J］. 系统工程与电子技术, 2010, 32(11): 2284-2289.
Wang Hongxian, Quan Yinghui, Xing Mengdao, et al. Fast Realization of SAR Echo Simulation Based on FPGA ［J］. Systems Engineering and Electronics, 2010, 32(11): 2284-2289.
［6］ Vandewal M, Speck R, Süβ H. Efficient SAR Raw Data Generation Including Low Squint Angles and Platform Instabilities ［J］. IEEE Trans on Geoscience and Remote Sensing, 2008, 2(1): 26-30.
［7］刁桂杰, 许小剑. 大斜视SAR原始数据的快速模拟算法研究［J］. 电子与信息学报, 2011, 33(3): 684-689.
Diao Guijie, Xu Xiaojian. Fast Algorithms for SAR Raw Data Simulation with Large Squint Angles ［J］. Journal of Electronics ＆ Information Technology, 2011, 33(3): 684-689.
［8］汪丙南, 张帆, 向茂生. 基于混合域的SAR回波快速算法［J］. 电子与信息学报, 2011, 33(3): 690-695.
Wang Bingnan, Zhang Fan, Xiang Maosheng. SAR Raw Signal Fast Algorithm in Mixed Domain ［J］. Journal of Electronics ＆ Information Technology, 2011, 33(3): 690-695.
［9］ Franceschetti G, Migliaccio M, Riccio D, et al. SARAS: a SAR Raw Signal Simulator ［J］. IEEE Trans on Geoscience and Remote Sensing, 1992, 30(1): 110-123.
［10］ Franceschetti G, Iodice A, Perna S, et al. SAR Sensor Trajectory Deviations: Fourier Domain Formulation and Extended Scene Simulation of Raw Signal ［J］. IEEE Trans on Geoscience and Remote Sensing, 2006, 44(9): 2323-2334.
［11］ Franceschetti G, Guida R, Iodice A, et al. Efficient Simulation of Hybrid Stripmap/Spotlight SAR Raw Signals from Extended Scenes ［J］. IEEE Trans on Geoscience and Remote Sensing. 2004, 42(11): 2385-2396.
［12］ Khwaja A S, Ferro-Famil L, Pottier E. SAR Raw Data Simulation Using High Precision Focusing Methods ［C］//EUSAR. Paris: The European Microwave Association, 2005: 33-36.
［13］ Gao Pengfei, Wu Junjie, Huang Yulin, et al. An Improved Method without Approximation for SAR Raw Signal Simulation Based on 2D Fourier Transform ［C］//3rd International Asia-Pacific Conference on SAR (APSAR). Seoul: Korea Aerospace Research Institute, 2011: 1-4.

[1]	武其松;邢孟道;刘保昌;保铮. 脉内聚束SAR方位高分辨率宽测绘带成像[J]. J4, 2010, 37(4): 676-682+699.
[2]	杨垒;王彤;保铮. 解运动目标径向速度模糊的一种新方法 [J]. J4, 2009, 36(2): 189-192.

一种二维频域SAR回波仿真的改进方法

Improved method for SAR echo signal simulation using two-dimensional frequency domain transformation

PDF (PC)

赞

可视化

被引次数

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 2

Metrics

本文评价

推荐阅读 10