| 超宽带/宽波束SAR的后向投影(BP)算法 |
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| 作者姓名： | 林翊青 李景文 |
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| 作者单位： | 北京航空航天大学电子信息工程学院 北京100083
(林翊青)，北京航空航天大学电子信息工程学院 北京100083(李景文) |
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| 摘 要： | 超宽带/宽波束(UWB/WB)SAR的相参积累角很大,会引起严重的距离徙动现象,使传统窄带/窄波束成像算法(RD算法等)不再适用。后向投影(BP)算法避免了菲涅耳近似,通过计算双程时延将信号进行相干累加,从而获得方位向高分辨率。文中对SAR成像以及BP算法的原理进行推导,然后通过计算机仿真验证理论分析的正确性和算法的有效性,最后详细讨论图像的像素间隔对成像的影响。
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| 关 键 词： | 超宽带/宽波束SAR 后向投影(BP)算法 距离多普勒(RD)算法 距离徙动 |
Back-Projection (BP) Algorithm for Ultra-Wideband/Widebeam SAR |
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| Authors: | Lin Yiqing Li Jingwen |
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| Institution: | Lin Yiqing Li Jingwen |
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| Abstract: | The large integration angle,leading to severe range migration, associated with fine resolution Ultra-Wideband/Widebeam(UWB/WB)SAR poses a significant problem for the traditional image formation algorithms(RD algorithm etc).Back-Projection(BP)algorithm avoids Fresnel approximation and obtains high cross-range resolution by calculating the two-way delay time and coherently summing up the data.This paper describes the principles of SAR imaging and BP algorithm, and then approves the correctness of the theory analysis and the validity of approach via computer simulation. Finally, the pixel interval of image which has effect on image formation is discussed in detail. |
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| Keywords: | Subject terms Ultra-Wideband/Widebeam SAR(UWB/WB-SAR) Back-Projection(BP) algorithm Range-Doppler(RD)algorithm range migration |
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