基于斜侧视圆周扫描的近场微波成像算法

Near-Field Microwave Imaging Method Based on Side-Looking Circular Scanning

针对传统小角度转台成像对大转角目标不能很好聚焦这一问题,研究了基于斜侧视圆周扫描的近场转台成像系统,提出了一种近场大转角成像算法,采用角度域卷积运算,可以快速得到目标的散射点分布,并能够进行很好的聚焦。本文根据点扩散函数给出了圆周扫描成像系统的分辨率计算公式,并推导了频率域和角度域的采样间隔。最后通过仿真和实验结果对该算法进行验证,结果表明该算法具有近场成像的能力,且能够得到高质量高分辨率的目标图像。

A near-field microwave imaging system based on side-looking circular scanning is studied. It can solve the problem that the traditional turntable imaging system cannot focus the targets with large angular rotation well. The proposed system introduces the sparse sampling technique in frequency domain, and the fast convolution algorithm in angular domain. The advantage of the proposed method is that it can obtain images with high resolution quickly. And the resolution of the proposed method is deduced according to point spreading function. The sampling criterion is then presented in both frequency domain and angular domain. The pro- posed method is testified by both simulation results and experimental ones. Results show that it can be used to acquire high quality and high resolution image.