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进行穿透扫描探测实验时,在回波图像中发现了由于介质具有倾斜角度产生的周期性干涉条纹,这种干涉条纹对介质后或者介质中的目标成像有严重影响.研究表明,这种干涉条纹主要由介质表面反射波及透射后的层面反射波引起.文中建立点源辐射模型分析干涉条纹现象的形成机理,推导出薄层介质的干涉条纹间距表达式.考虑到天线的影响,建立了角锥喇叭天线近场模型,并且基于该模型进行精确的电磁仿真.商用软件Computer SimulationTechnology的电磁仿真结果与MATLAB程序的数字计算结果进一步验证了干涉条纹的成因分析及其与介质倾斜角度的关系.从推导的薄层介质干涉条纹间距表达式可以看出,干涉条纹间距与介质倾斜角度有关,控制影响条纹间距的因素,可以抑制干涉条纹现象,从而达到提高目标分辨率和成像质量的效果.
In penetrating scan detection experiments, periodic interference fringes are found in the echo images due to the slant angle of the medium, and such interference fringes have a serious impact on the target imaging in the medium or in the medium. Studies have shown that such interference The fringe is mainly caused by the reflection of the medium surface and the reflected layer after the transmission. The point source radiation model is established to analyze the formation mechanism of the fringe pattern and the expression of the interference fringe spacing is deduced. Considering the influence of the antenna, Cone horn antenna near-field model, and based on the model for accurate electromagnetic simulation.Microsoft Computer SimulationTechnology electromagnetic simulation results and MATLAB program numerical results further verify the formation of interference fringes and its relationship with the media tilt angle. It can be seen that the distance between interference fringes is related to the tilt angle of the medium. Controlling the factors that affect the fringe spacing can suppress the interference fringes and improve the target resolution and imaging quality.