微波强度关联图像辐射性能敏感性分析

微波强度关联成像技术通过发射时空两维随机辐射场,并与接收的目标回波强度数据进行关联以实现超天线孔径限制的微波成像。作为一种新型静止雷达成像技术,其不同模型参数对于重构图像辐射性能影响尚不明确。基于微波强度关联成像模型,通过改变模型参数设置,可以获得观测矩阵和重构图像的辐射特性变化趋势,以此分析不同参数设置下图像的辐射性能。分析结果表明:改进天线阵元数目、带宽等模型参数,能有效提高图像辐射性能,尤其是大场景高分辨率的成像区域;增大天线平台高度和网格长度,图像辐射性能有所降低;对于地物均匀的场景,系统设计要求相对较低。分析结果将有助于改善系统设计参数。

Sensitivity Analysis on Radiant Performance of Microwave Intensity Correlation Image

Microwave Intensity Correlation Imaging (MICI) breaks the limitation of antenna aperture to reconstruct image by random radiation field and echo signals.As a new type of statical imaging technique,the influence of model parameters was not clear to the image radiant performance.The MICI theory was demonstrated in the paper,and then model parameters were changed to analyze the radiant performance of measurement matrix and reconstructed image.The results showed that the image radiant performance can be improved by increasing the number of antennas and antennas’ space and bandwidth,especially for large and high resolution area.However,it drops if antennas are in a higher platform or girds are larger.The lower quality system is acceptable to well\|distributed area.This study is conducive to improve the MICI system.