基于快速傅里叶变换的扫描单发单收面阵近场成像技术

近年来,扫描单发单收面阵近场成像技术在安检、医疗等民用领域中引起了广泛关注.然而,传统的距离徙动算法在对回波进行处理的过程中无法避免多步近似和插值操作,并且忽视了信号传播衰减带来的不利影响.因此,提出了一种基于快速傅里叶变换的扫描单发单收面阵近场成像技术,该技术通过保留回波模型中的幅度衰减因子,并根据目标回波方程特性对...

Fast Fourier transform-based scanning single-input-single-output array near-field imaging technology

In recent years, the scanning SISO(single-input-single-output) array near-field imaging technology has attracted widespread attention in civilian fields, such as security inspection and medical treatment. However, during the echo processing of traditional range migration algorithm, the multi-step approximation and interpolation operation cannot be avoided, and the adverse effect caused by signal propagation attenuation is ignored. Therefore, this research proposed a FFT (fast Fourier transform)-based scanning SISO array near-field imaging technology in which the amplitude attenuation factor in the echo model was preserved. The convolution operation on azimuth and altitude dimensions was performed according to the characteristics of the target echo equation. The target image could be obtained by applying FFT and coherent accumulation steps. Simulation analysis and experimental results show that the proposed method can not only improve the target image quality while ensuring the efficiency of image reconstruction, but also effectively reduce the impact of signal spatial propagation loss on the imaging quality.