地球同步轨道SAR曲线轨迹二维空间分辨率分析

doi:10.3969/j.issn.1001-2400.2015.01.010

J4 ›› 2015, Vol. 42 ›› Issue (1): 62-68.doi: 10.3969/j.issn.1001-2400.2015.01.010

地球同步轨道SAR曲线轨迹二维空间分辨率分析

陈溅来;李震宇;杨军;孙光才;邢孟道

(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)

收稿日期:2013-10-20 出版日期:2015-02-20 发布日期:2015-04-14
通讯作者: 陈溅来
作者简介:陈溅来(1990-)，男，西安电子科技大学博士研究生，E-mail: jianlaichen@163.com．
基金资助:
国家自然科学基金资助项目(61222108，61301292)

Analysis of the two-dimensional spatial resolution for the curved trajectory of GEO SAR

CHEN Jianlai;LI Zhenyu;YANG Jun;SUN Guangcai;XING Mengdao

(National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071, China)

Received:2013-10-20 Online:2015-02-20 Published:2015-04-14
Contact: CHEN Jianlai

摘要/Abstract

摘要：

针对地球同步轨道合成孔径雷达(GEO SAR)中，卫星轨道是曲线轨迹，且由于地球自转等因素的影响，卫星相对于点目标的运动轨迹没有显式表达式，且航迹速度在不同的卫星轨道位置差异很大的问题，提出了一种基于相位梯度分析的高轨SAR二维空间分辨率计算方法．文中提出了一种猜想，并采用介值定理证明:在合成孔径时间内，存在1个等效航迹速度，使得理论方位向分辨率位于1个范围之内，并计算得到了该方位向分辨率范围．最后，后向投影算法仿真实验验证了该方法的有效性．

关键词: 地球同步轨道, 相位梯度, 二维空间分辨率, 介值定理, 后向投影算法

Abstract:

In geosynchronous earth orbit synthetic aperture radar(GEO SAR), because of such factors as the curve track of the satellite, the influence of earth rotation and so on, there is no explicit expression for the moving track of the satellite with respect to the target, and the track velocity varies greatly on different obit positions of the satellite, so the method of calculating resolution for uniform line motion in airborne and LEO SAR is not suitable for GEO SAR. Aiming at the mentioned problems, this paper proposes a method of calculating the two-dimensional spatial resolution based on phase gradient analysis in GEO SAR. In this paper, a conjecture is presented and proved by introducing the intermediate value theorem. There exists an equal track velocity, which can ensure the theoretical azimuth resolution within a range, and that azimuth resolution range is calculated. Finally, the Back projection (BP) algorithm simulation experiments validate the proposed method.

Key words: geosynchronous earth orbit(GEO), phase gradient, two-dimensional spatial resolution, intermediate value theorem, backprojection (BP) algorithm

陈溅来;李震宇;杨军;孙光才;邢孟道. 地球同步轨道SAR曲线轨迹二维空间分辨率分析[J]. J4, 2015, 42(1): 62-68.

CHEN Jianlai;LI Zhenyu;YANG Jun;SUN Guangcai;XING Mengdao. Analysis of the two-dimensional spatial resolution for the curved trajectory of GEO SAR[J]. J4, 2015, 42(1): 62-68.

参考文献

［1］ Wiley C A. Synthetic Aperture Radar ［J］. IEEE Transactions on Aerospace and Electronic Systems, 1985, 21(3): 440-443.
［2］邓云凯, 赵凤军, 王宇. 星载SAR技术的发展趋势及应用浅析［J］. 雷达学报, 2012, 1(1): 1-10.
Deng Yunkai, Zhao Fengjun, Wang Yu. Brief Analysis on the Development and Application of Spaceborne SAR［J］. Journal of Radars, 2012, 1(1): 1-10.
［3］包敏, 李亚超, 邢孟道, 等. 椭圆轨道GEOSAR 特性分析及成像方法研究［J］. 西安电子科技大学学报, 2010, 37(6): 1033-1041.
Bao Ming, Li Yachao, Xing Mengdao, et al. Analysis of the Characteristics of Geosynchronous SAR in the Elliptic Orbit and a Study of Imaging Methods ［J］. Journal of Xidian University, 2010, 37(6): 1033-1041.
［4］ Long Teng, Dong Xichao, Hu Cheng, et al. A New Method of Zero-Doppler Centroid Control in GEO SAR ［J］. IEEE Geoseience and Remote Sensing Letters, 2011, 8(3): 512-516.
［5］ Bao Min, Xing Mengdao, Li Yachao. Chirp Scaling Algorithm for GEO SAR Based on Fourth-order Range Equation［J］. Electronics Letters, 2012, 48(1): 41-42.
［6］ Hu Cheng, Long Teng, Zeng Tao, et al. The Accurate Focusing and Resolution Analysis Method in Geosynchronous SAR ［J］. IEEE Transactions on Geoscience and Remote Sensing, 2011, 21(3), 324-329.
［7］ Hu Cheng, Long Teng, Zhu Yu, et al. The Accurate Focusing and Resolution Analysis in Geosynchronous SAR ［C］//European Conference on Synthetic Aperture Radar. Piscataway: IEEE, 2010: 925-928.
［8］ Davidson G W, Cumming I. Signal Properties of Spaceborne Squint-mode SAR ［J］. IEEE Transactions on Geoscience and Remote Sensing, 1997, 35(3): 611-617.
［9］ Sun Guangcai, Xing Mengdao, Wang Yong, et al. Sliding Spotlight and TOPS SAR Data Processing without Subaperture ［J］. IEEE Geoscience and Remote Sensing Letters, 2011, 8(8): 1036-1040.
［10］ Li Yanping, Zhang Zhenhua, Xing Mengdao, et al. Bistatic Spotlight SAR Processing Using the Frequency-scaling Algorithm ［J］. IEEE Geoscience and Remote Sensing Letters, 2008, 5(1): 48-52.
［11］ Wang Jingen, Wang Yanfei, Zhang Jianming, et al. Resolution Calculation and Analysis in Bistatic SAR with Geostationary Illuminator［J］. IEEE Geoscience and Remote Sensing Letters, 2013, 10(1): 194-198.
［12］ Wang Jinggen, Chen An, Wang Yanyu, et al. Fast Approach to Calculating the Resolution in Arbitrary Direction for Bistatic SAR with Arbitrary Geometry Configuration ［C］//1st Asian and Pacific Conference on Synthetic Aperture Radar. Piscataway: IEEE, 2007: 603-608.
［13］ Tian Weiming, Zeng Tao. Resolution Characteristic Analysis for Space-surface BiSAR［C］//IET International Radar Conference. Steverage: IET, 2009: 1-4.
［14］仇晓兰, 丁赤飚, 胡东辉. 双站SAR成像处理技术［M］. 北京: 科学出版社, 2010: 46-58.
［15］ Desai M D, Jenkins W K. Convolution Backprojection Image Reconstruction Spotlight Mode Synthetic Aperture Radar［J］. IEEE Transactions on Geoscience and Remote Sensing, 1992, 1(4): 505-517.

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地球同步轨道SAR曲线轨迹二维空间分辨率分析

Analysis of the two-dimensional spatial resolution for the curved trajectory of GEO SAR

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