适用大场景高分辨合成孔径雷达的快速BP算法

在进行大场景、高分辨合成孔径雷达(synthetic aperture radar,SAR)成像处理时,基于后向投影(back-projection,BP)的SAR成像算法由于运算量大其应用受到限制,而基于快速变换的算法是在信号的频率域进行,要求线性孔径,对运动补偿的要求太高其应用也受到限制。提出了一种快速后向投影(fast back-projection,FBP)算法,对大场景、高分辨的SAR成像处理时其计算效率比传统的BP算法有显著提高。仿真结果表明,其成像质量与传统的BP算法相近。

A Fast Back-Projection Algorithm for the SAR with Large Scene and High Resolution

In the imaging of the synthetic aperture radar( SAR) with large scene and high resolution, the application of the back-projection(BP) algorithm for SAR imaging is restricted due to its great computation load, while the application of the algorithm based on fast transform which can only be used in the frequency domain of signal is restricted too because it requires a linear aperture and its demand for motion compensation is too high. In this paper a fast back-projection algorithm for SAR with large scene and high resolution is presented. The computation efficiency of the algorithm is superior to that of the traditional back-projection algorithm. Computer simulation results show that the image quality of the fast back-projection is similar to that of the back-projection.