SAS image reconstruction using Fast Polar Back Projection: comparisons with Fast Factored Back Projection and Fourier-domain imaging
SAS image reconstruction using Fast Polar Back Projection: comparisons with Fast Factored Back Projection and Fourier-domain imaging
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DOI：
10.1109/oceanse.2005.1511691
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发表时间：
2005-06
期刊：
影响因子：
--
通讯作者：
G. Shippey;S. Banks;J. Pihl
中科院分区：
文献类型：
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作者：
G. Shippey;S. Banks;J. Pihl
快速极坐标反投影（Fast Polar Back Projection，FPBP）是快速因子反投影（Fast Factored Back Projection，FFBP）算法的一种变体，最初是为超宽带机载合成孔径雷达（SAR）开发的，但后来成功应用于合成孔径声纳（Synthetic Aperture Sonar，SAS）。本文概述了FPBP和FFBP算法，比较两种方法的计算时间和内存需求。处理时间与标准的基于FFT的方法进行比较。由于FFBP和FPBP都是近似方法，计算时间也取决于预设的近似误差，这特别影响方位旁瓣电平。该文件提供了一个机会，审查速度和准确性的估计在以前的文献。然而，计算时间的减少并不是这些时域方法的决定性优势。与基于FFT的方法的不同之处在于可以处理非线性平台轨迹、宽扫描带、宽带宽和多元声纳阵列的灵活性。获得用于自动定位目的的一组中间物理孔径图像也是直接的。
Fast Polar Back-Projection (FPBP) is a variant of the Fast-Factored Back-Projection (FFBP) algorithm, originally developed for ultra-wideband airborne Synthetic Aperture Radar (SAR), but since applied with success to Synthetic Aperture Sonar (SAS). The paper outlines the FPBP and FFBP algorithms, comparing computation time and memory requirements for the two methods. Processing time comparisons with a standard FFT-based method are also given. Since FFBP and FPBP are both approximation methods, computation time also depends on the preset approximation error, which particularly affects azimuth sidelobe level. The paper provides an opportunity to review speed and accuracy estimates made in previous literature. However reduction in computation time is not the decisive advantage of these time-domain methods. The difference from the FFT-based methods lies in the flexibility with which nonlinear platform trajectories, wide swaths, wide bandwidths, and multielement sonar arrays can be handled. It is also straightforward to obtain a set of intermediate physical aperture images for autopositioning purposes.