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由于后向投影算法可以精确补偿电磁波在介质表面发生的折射效应,因此它在机载探地雷达成像技术领域具有较强的工程实用价值。但传统后向投影成像算法存在计算量大难以实时实现的问题,针对上述问题,文中提出一种基于非均匀快速傅里叶变换(NUFFT)技术的机载探地雷达快速后向投影成像算法。通过对基于时域有限差分法产生的仿真数据进行处理,验证了所提成像算法的有效性和快速运算能力。
As the backward projection algorithm can precisely compensate the refraction effect of the electromagnetic wave on the medium surface, it has strong engineering practical value in the field of airborne GPR imaging technology. However, the traditional back-projection imaging algorithm is difficult to realize in real-time because of the computational complexity. In view of the above problems, this paper proposes a fast back-projection imaging algorithm based on Non-uniform Fast Fourier Transform (NUFFT). By processing the simulation data generated based on the finite difference time domain method, the validity and fast computing ability of the proposed algorithm are verified.