基于Chirp_z变换与方位变标地球同步轨道SAR成像算法

李财品; 何明一

doi:10.11999/JEIT141491

基于Chirp_z变换与方位变标地球同步轨道SAR成像算法

doi: 10.11999/JEIT141491

李财品¹,
何明一²

2.
(西北工业大学电子信息学院西安 710129) ②(中国空间技术研究院西安分院西安 710100)

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出版历程
- 收稿日期: 2014-11-26
- 修回日期: 2015-03-25
- 刊出日期: 2015-07-19

Imaging Algorithm for Geosynchronous Orbit SAR Based on Chirp_z Transform and Azimuth Scaling

Li Cai-pin¹,
He Ming-yi²

2.
(School of Electronics and Information, Northwestern Polytechnical University, Xi&rsquo

摘要

摘要: 针对地球同步轨道合成孔径雷达(GEO SAR)成像距离向处理复杂，方位向空变性强问题，该文提出一种基于Chirp_z变换与方位变标的成像算法。首先在回波模型中考虑停-走-停假设带来的相位误差，然后给出目标点的斜距表达式，并利用泰勒级数对斜距进行了高阶展开，通过级数反演法得到信号频谱表达式，利用高效的Chirp_z变换校正距离走动，简化距离向处理，利用改进的变标因子校正方位向信号一次，二次，三次展开项系数线性时变性，并在方位频域内补偿变标操作引入的相位误差。仿真结果表明该算法能够实现地球同步轨道SAR聚集成像。
- 地球同步轨道合成孔径雷达 /
- 成像算法 /
- Chirp_z变换 /
- 方位变标
Abstract: Aiming at the problem of complex range processing and strong azimuth variant in GEosynchronous Orbit SAR (GEO SAR) imaging processing, an imaging algorithm based on Chirp_z transform and the azimuth scaling is proposed. Firstly, the stop-go-stop phase error is considered in the echo model, and then the slant distance expression which is expanded using the Taylor series is given. After that, a series of inversion method is used to get the signal spectrum expression. In order to simplifying the imaging processing at range direction, the Chirp_z transform is used to correct the range walk. And then, an improved scale factor is used to correct the linear time-varying coefficient of signal expand included the first order, the second order and the three order. The phase error introduced by scaling operation is compensated in frequency domain. Finally, the simulation results show that the algorithm can realize geosynchronous orbit SAR imaging.
- GEosynchronous Orbit SAR (GEO SAR) /
- Imaging algorithm /
- Chirp_z transform /
- Azimuth scaling

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参考文献(15)

Wu Zhou-ting,?Huang Li-jia, Hu Dong-hui,et al.. Azimuth resolution analysis in geosynchronous SAR with azimuth variance property[J]. Electronics Letters, 2014, 50(6): 464-466

Hobbs S E, Snapir B, Corstanje R, et al.. Simulation of geosynchronous radar and atmospheric phase compensation constraints[C]. Proceedings of the IET International Radar Conference, Xian, China, 2013: 1-6.

Hu Cheng, Long Teng, Liu Zhi-peng, et al.. An improved frequency domain focusing method in geosynchronous SAR[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(9): 5514-5528.

Zhao Bing-ji, Qi Xiang-yang, Song Hong-jun, et al.. An accurate range model based on the fourth-order doppler parameters for geosynchronous SAR[J]. IEEE Transactions on Geoscience and Remote Sensing Letters, 2014, 11(1): 205-209.

Bao Min and Xing Meng-dao. Chirp scaling algorithm for GEO SAR based on fourth-order range equation[J]. Electronics Letters, 2012, 48(1): 56-57.

Hu Cheng, Liu Zhi-peng, and Long Teng. An improved CS algorithm based on the curved trajectory in geosynchronous SAR[J]. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2012, 5(3): 795-808.

Wu Xiu, Zhang Shun-sheng, Li Jing. et al.. Geosynchronous SAR image formation based on advanced hyperbolic range equation[C]. Proceedings of IEEE Geoscience and Remote Sensing Symposium (IGARSS), Munich, Germany, 2012: 4042-4045.

Sun Guang-cai, Xing Meng-dao, Wang Yong, et al.. A 2-D space-variant chirp scaling algorithm based on the RCM equalization and subband synthesis to process geosynchronous SAR data[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(8): 4868-4880.

Li Zhuo, Li Chun-sheng, Yu Ze, et al.. Back projection algorithm for high resolution GEO-SAR image formation[C]. Proceedings of IEEE Geoscience and Remote Sensing Symposium (IGARSS), Vancouver, Canada, 2011: 336-339.

Hobbs S, Mitchell C, Forte B, et al.. System design for geosynchronous synthetic aperture radar missions[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(12): 7750-7763.

Ruiz-Rodon J, Broquetas A, Makhoul E, et al.. Nearly zero inclination geosynchronous SAR mission analysis with long integration time for earth observation[J]. IEEE Transactions on Geoscience and Remote Sensing, 2014, 52(10): 6379-6391.

黄丽佳, 胡东辉, 丁赤飚. 中高轨道SAR信号建模和成像方法研究[J]. 国外电子测量技术, 2011, 30(6): 21-27.

Huang Li-jia, Hu Dong-hui, and Ding Chi-biao. Study on signal modeling and imaging approach for medium- earth-orbit SAR[J]. Foreign Electronic Measurement Technology,?2011, 30(6): 21-27.

周鹏, 周松, 熊涛等. 基于级数反演的弹载SAR下降段CZT成像算法[J]. 电子与信息学报, 2010, 32(12): 2861-2867.

Zhou Peng, Zhou Song, Xiong Tao, et al.. A chirp-z transform imaging algorithm for missile-borne SAR with diving maneuver based on the method of series reversion[J]. Journal of Electronics Information Technology, 2010, 32(12): 2861-2867.

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