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本文介绍一种在方位(横向)和距离(纵向)上均具有高分辨率的多频微波全息成象方法。为了提高方位分辨率,本成象法引进了原先用于脉冲回波成象的脉冲雷达系统合成孔径处理。本文所述的成象技术对实际的发射信号波形不加任何约束,并能实现三维成象。本文阐明:(1)根据基尔霍夫绕射理论说明收发信号关系的一般公式。(2)试验函数,它是从接收信号产生目标图象的线性运算的核。(3)对接收信号进行脉宽压缩和旁瓣电平抑制的滤波器设计技术。数值图象重建说明,该方法具有高分辨力。
This article describes a multi-frequency microwave holographic imaging method with high resolution both in azimuth (lateral) and in distance (longitudinal). In order to improve azimuth resolution, the imaging method introduced the synthetic aperture processing of pulse radar system originally used for pulse echo imaging. The imaging technique described herein imposes no constraints on the actual transmitted signal waveform and enables three-dimensional imaging. This paper states: (1) According to Kirchhoff diffraction theory to explain the relationship between the general formula of the transceiver. (2) Test function, which is a linearly-operated kernel that produces a target image from the received signal. (3) The received signal pulse width compression and sidelobe level suppression filter design techniques. Numerical image reconstruction shows that this method has high resolution.