基于幾何校正的聚束SAR快速分級(jí)后投影算法
doi: 10.11999/JEIT141254
基金項(xiàng)目:
國(guó)家自然科學(xué)青年基金(61301292)和教育部博士點(diǎn)基金(20130203120007)資助課題
Geometric Correction Based Fast Factorized Back Projection Algorithm for Spotlight SAR Imaging
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摘要: 快速分級(jí)后投影(Fast Factorized Back Projection, FFBP)算法大幅減少了原始后投影算法的插值次數(shù),提升運(yùn)算效率。然而圖像合成過程中仍然需要大量的圖像域2維插值操作,龐大的計(jì)算量限制了其在實(shí)際中的應(yīng)用。該文提出一種基于幾何校正的聚束SAR快速分級(jí)后投影算法。該算法利用幾何校正的方法實(shí)現(xiàn)子圖像配準(zhǔn),即在滿足聚焦性能的前提下,通過距離維平移和角度維旋轉(zhuǎn)完成子圖像在不同坐標(biāo)系下的投影和子圖像合成。該算法避免了逐點(diǎn)插值運(yùn)算,進(jìn)一步降低了FFBP算法的計(jì)算量。仿真結(jié)果表明,該算法能高精度聚焦成像,并且其運(yùn)算效率相對(duì)于基于圖像域2維插值的FFBP算法顯著提高。
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關(guān)鍵詞:
- SAR /
- 聚束 /
- 快速分級(jí)后投影 /
- 幾何校正 /
- 逐點(diǎn)插值
Abstract: Compared with the Back Projection Algorithm (BPA), the interpolation load of the Fast Factorized Back Projection Algorithm (FFBPA) is released. However, the 2D interpolation in the image domain is essential for the FFBPA and the intensive computational burden limits its application in practice. This paper presents the geometric correction based FFBPA for the spotlight SAR imaging. In this algorithm, the sub-image registration is accomplished by the geometric correction method that the sub-image projection in the different coordinate systems and sub-image fusion are fulfilled by the shift in the range dimension and the rotation in the angle dimension. Thus the method avoids the individual interpolation and it is more efficient than the FFBPA. Simulation results validate its imaging performance and efficiency. -
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