一种弹载侧视SAR大场景成像算法
doi: 10.3724/SP.J.1146.2009.00283 cstr: 32379.14.SP.J.1146.2009.00283
A Large Scene Imaging Algorithm for Missile-borne Side-looking SAR
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摘要: 导弹的俯冲加速运动所带来的较大距离徙动使得SAR成像难度较大。该文根据弹载SAR平台的运动特点，使用高阶逼近模型建立了SAR的回波信号模型。考虑到大场景下的距离空变问题，对目标斜距随时间的变化进行了详细的分析。结合级数反演法，得到了弹载SAR回波信号的2维频域的精确表达式。基于此式，提出了一种适用于弹载SAR俯冲加速运动下的大场景成像算法。理论分析和实验结果表明，该算法对较大场景取得了较好的成像效果，距离向和方位向分辨率都达到了理论分辨率。Abstract: The large range migration produced by missile diving acceleration flight make SAR image difficult. This paper establishes the echo model of the missile-borne SAR by using the high order range model based on the characters of the missile movements. Considering the large scene, the change of the slant range is analyzed in details. Then, the two-dimensional point target spectrum is derived by the method of series reversion. A large scene imaging algorithm used for diving acceleration flight is presented. Finally, simulation results are presented to demonstrate the accuracy and validity of the proposed algorithms. The resolution of range and azimuth are identical with the theoretical values.
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Yi Yu-sheng, Zhang Lin-rang, Liu Xin, Liu Nan, and ShenDong. Study on imaging algorithm for missile-borne sidelookingSAR[C]. 1st Asian and Pacific Conference onSynthetic Aperture Radar, Huangshan, China, November.5-9, 2007: 413-417.[2]燕英, 周荫清, 李春升, 许丽香. 弹载合成孔径雷达成像处理及定位误差分析[J].电子与信息学报.2002, 24(12):1932-1938浏览[3]孙兵, 周荫清, 陈杰. 高速俯冲SAR 成像方法研究[J]. 电子与信息学报, 2004, 26(9): 173-180.Sun Bing, Zhou Yin-qing, and Chen Jie. Imaging method ofmissile-borne SAR with high diving speed[J]. Journal ofElectronics Information Technology, 2004, 26(9): 173-180.[4]俞根苗, 尚勇, 邓海涛, 张长耀, 葛家龙, 吴顺君. 弹载侧视合成孔径雷达信号分析及成像研究[J].电子学报, 2005, 33(5):778-782.Yu Gen-miao, Shang Yong, Deng Hai-tao, Zhang Chang-yao,Ge Jia-long, and Wu Shun-jun. Signal analysis and imagingprocessing of missile-borne side-looking SAR[J]. ActaElectronica Sinica, 2005, 33(5): 778-782. -
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