摘要
对于介质目标微波衍射成象,本文引入了WKB近似来模拟目标内部总场。基于这种近似,我们导出了Fourier衍射公式,并采用了广义滤波逆传播方法由目标空间谱实现目标特性的重建。计算机模拟结果表明采用WKB近似重建目标特性较Born近似有明显改善。
For microwave diffraction imaging, we use the WKB approximation to estimate the total field in the dielectric object. Compared to the Born approximation, the amplitude and phase of total field in the object are modified. The Fourier Diffraction Theorem that is quite similar to the one proposed by Wolf(1969) is then derived. By using the extended filtered backpropagation algorithm the object can be reconstructed from the spatial spectrum. The computer simulations show that the quality of image reconstructed by proposed scheme is superior to the one produced by Born approximation.
出处
《电子学报》
EI
CAS
CSCD
北大核心
1996年第12期83-85,共3页
Acta Electronica Sinica
基金
博士点基金
国防科技预研基金
关键词
微波成象
WKB近似
目标空间谱
傅里叶衍射
Microwave imaging, WKB approximation, Spatial spectrum, Extended filtered backpropagation algorithm