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在双站距离徙动算法的基础上,研究了三维MIMO阵列成像算法,提出了近场传播损耗补偿方法。在考虑近场电磁波衰减的基础上,严格根据驻定相位法原理详细推导了成像算法公式,得出双站距离徙动成像算法关键的幅度衰减补偿因子,补偿因子影响图像幅度一致性,近程三维成像条件下不能够忽略。为了验证成像算法性能,设计了简单的二维稀疏平面阵列,进行仿真成像及暗室环境下的实测成像实验,成像聚焦效果良好,表明该算法可用于近距离、高分辨率、三维成像系统。
Based on the double-station migration algorithm, the three-dimensional MIMO array imaging algorithm is studied and a near-field propagation loss compensation method is proposed. Based on the attenuation of near-field electromagnetic waves, the imaging algorithm formula is deduced strictly based on the principle of stationary phase method, and the key amplitude attenuation compensation factor of the bi-station distance migration imaging algorithm is obtained. The compensation factor affects the image amplitude consistency, short-range Three-dimensional imaging conditions can not be ignored. In order to validate the performance of the imaging algorithm, a simple two-dimensional sparse planar array is designed for real-time imaging experiment in simulated imaging and darkroom environment. The imaging focusing effect is good, which shows that the algorithm can be used in short-range, high-resolution and three-dimensional imaging systems.