Arbitrary synthetic aperture motion compensation based on Fast Back Projection
Arbitrary synthetic aperture motion compensation based on Fast Back Projection
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发表时间：
2010-11
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通讯作者：
Yanghuan Li;Qian Song;T. Jin;Zhimin Zhou
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作者：
Yanghuan Li;Qian Song;T. Jin;Zhimin Zhou
背投影成像算法可以在高度不均匀的孔径下工作，其效率较低，限制了其在实际项目中的应用。鉴于此，许多学者提出了一些基于子孔径法的快速反投影算法。但如何补偿子孔径分割后的运动误差还有待进一步研究。研究了FBP算法在不同运动误差水平下的运动补偿方法。这里讨论三种表示不同运动误差水平的情况，即仅方位孔径不均匀、二维运动误差轨迹和高度非线性甚至曲线飞行轨迹。然后提出一种任意孔径的快速反投影成像算法，该算法需要高精度的位置信息。最后通过外部实验验证了算法的有效性。
Back Projection imaging algorithm, whose low efficiency reduces its applications in practical projects, could work with highly nonuniform apertures. According to this reason, many scholars have presented some Fast Back Projection algorithms based on sub-aperture method. But how to compensate the motion error after sub-aperture dividing is awaited for further studying. The motion compensation method for FBP algorithm at different motion error levels is studied in this paper. Three situations denoting different motion error levels, which are only non-uniform in azimuth aperture, tracks of two-dimensional motion error and highly nonlinear even curvilinear flight tracks, are discussed here. Then it comes to a fast back projection imaging algorithm for arbitrary aperture, and this algorithm needs highly precise position information. Finally, an outside experiment is made to prove the algorithm's availability.