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。

Since back projection (BP) algorithm can conveniently compensate for the refraction phenomenon of the layered medium, BP imaging algorithm is one of the most practical imaging methods in the area of airborne ground penetrating radar (GPR) technology. However, the high computation burden and hardness of real time implementation limit the practical application of traditional BP imaging algorithm to airborne GPR system. To solve the above problem, a novel fast BP imaging algorithm for airborne GPR using nonuniform fast Fourier transform (NUFFT) technique is proposed in this paper. The effectiveness and improvement of computation efficiency of the proposed imaging algorithm have been verified by processing the synthetic data generated by the finite difference time domain (FDTD) method.

TN951

国家自然科学基金项目；辽宁省自然科学基金项目；辽宁省博士启动基金项目