DOI: 10.3724/SP.J.1300.2013.20073

Journal of Radars (雷达学报) 2013/2:2 PP.203-209

Data-based Parameter Estimation Method for Circular-scanning SAR Imaging

The circular-scanning Synthetic Aperture Radar (SAR) is a novel working mode, and its image quality is closely related to the accuracy of the imaging parameters, particularly considering the inaccuracy of the real speed of motion. According to the characteristics of the circular-scanning mode, a novel data-based method for estimating the velocities of the radar platform and the scanning-angle of the radar antenna is proposed in this paper. By referring to the basic concept of the Doppler navigation technique, we first improve the mathematic model and formulations for the parameter estimation. The optimal parameter approximation based on the least square criterion is then realized for solving the equations derived from the data processing. The simulation results verify the validity of the proposed scheme.

Key words:Synthetic Aperture Radar (SAR),Circular-scanning mode,Parameters estimation,Least-square approximation

ReleaseDate:2014-07-21 16:58:32

[1] Ian G C and Frank H W. Digital Processing of Synthetic Aperture Radar Data: Algorithms and Implementation[M]. Beijing: Publishing House of Electronics Industry, 2007: 20-132.

[2] 毛新华, 朱岱寅, 李勇, 等. 环视SAR几何失真校正误差分析及补偿技术研究[J]. 电子与信息学报, 2008, 30(11): 2706-2709.Mao Xin-hua, Zhu Dai-yin, Li Yong, et al.. Error analysis of geometric distortion correction and compensation techniques for circular-scanning SAR[J]. Journal of Electronics & Information Technology, 2008, 30(11): 2706-2709.

[3] Li Yong and Zhu Dai-yin. Geometric distortion correction algorithm for circular-scanning SAR imaging[J]. IEEE Geoscience and Remote Sensing Letters, 2010, 7(2): 376-380.

[4] Tao Man-yi, Li Yong, Zhu Dai-yin, et al.. Signal based parameter estimation for precise circular-scanning SAR imaging[C]. 2010 International Symposium on Signals Systems and Electronics (ISSSE), Nanjing, China, Sept. 17-20, 2010, 2: 1-4.

[5] 孙文峰, 陈安, 邓海涛, 等. 一种新的机载SAR图像几何校正和定位算法[J]. 电子学报, 2007, 35(3): 553-556.Sun Wen-feng, Chen An, Deng Hai-tao, et al.. A new algorithm of imaging geometric correction and positioning for airborne SAR[J]. Acta Electronica Sinica, 2007, 35(3): 553-556.

[6] Myron Kayton and Walter R Fried. Avionics Navigation Systems[M]. New York, John Wiley & Sons, Inc., 1997: 449-502.

[7] 禹卫东. 合成孔径雷达信号处理研究[D]. [博士论文], 南京航空航天大学, 1997.Yu Wei-dong. Synthetic aperture radar signal processing[D]. [Ph.D. dissertation], Nanjing University of Aeronautics and Astronautics, 1997.

[8] Yu M, Xu J, Peng Y-N, et al.. Joint estimation of Doppler centroid and rate for SAR with large range migration[J]. IET Radar, Sonar & Navigation, 2007, 1(3): 207-212.

[9] Li Yong, Zhu Dai-yin, Zhu Zhao-da, et al.. Study on geometric distortion correction in the subaperture processing for high squint airborne SAR imaging[J]. Chinese Journal of Electronics, 2006, 15(1): 113-116.