利用二维合成孔径并发射宽带信号,可以实现目标的距离-方位-方位三维成像,提出一种基于三维匹配滤波的高适应性三维成像算法.先选定成像焦点的位置,再根据场景参数计算出在该焦点处的回波数据,将其反转共轭充当整个目标回波的匹配函数,然后将该匹配函数与目标回波进行三维匹配滤波直接成像.该算法流程简单,适应性很强,对具有各种形状如矩形、圆形、三角形及不规则形状的二维合成孔径均适用,且在近场条件下具有比传统成像算法明显高的成像分辨率.通过详细的理论推导与其型示例证明了所提算法的有效性.%The range-azimuth-azimuth 3-D imaging results of targets can be obtained by using 2-D synthetic aperture and transmitting wideband signals. A high adaptability 3-D imaging algorithm based on 3-D matched filtering is proposed. Firstly, the position of imaging focus is selected and the echoes of focus are calculated. Then the 3-D matched function which equals to the inverse-conjugate echoes of imaging focus is calculated. Finally 3-D imaging by 3-D matched filtering between the target echoes and the matched function is realized. This novel imaging algorithm has simple procedure and high adaptability. It can be used in many 2-D synthetic apertures which have kinds of forms such as rectangle, circle, triangle and other anomalistic forms. And it has an obviously higher imaging resolution than that of conventional imaging algorithm. The detailed theory analysis and typical examples are given to verify its validity.
展开▼
