摘要
由于电磁波在穿越不同介质时会出现折射现象,因此在机载条件下对地下目标成像时,电磁波信号从机载雷达到达地下目标的整个路径不是直线而是折线,此时再利用常规的自由空间中合成孔径成像方法已经不能对目标进行良好成像。基于电磁波的传播规律和地层有耗媒质的特性,文章提出了电磁波传输的三层空间模型,并将其应用到机载条件下的地下目标成像,通过仿真比较,可以明显看出,使用三层空间模型后对地下目标成像效果的改善,验证了三空间模型适用于机载条件下对分层土壤中的地下目标成像。
Because of the refraction of electromagnetic wave when traversing different medium, the route of the signal from airborne radar to underground object is not beeline but curve. Here routine SAR imaging method in free space can＇t already be used for the imaging of underground objects. Based on spread rule of electromagnetic wave and characteristic of stratum loss medium, a three - layer - space model of electromagnetic wave transmission is proposed. When the model is used for imaging of underground objects we gain the expression of echo. The imaging effects are compared before and after using three - layer - space model by simulation. It is effectively proved that the three - layer - space model is fit for imaging of underground objects in multilayer soil with airborne radar.
出处
《计算机仿真》
CSCD
2007年第8期45-48,共4页
Computer Simulation
关键词
地下目标探测
自由空间
三层空间模型
Underground objects detection
Free space
Three - layer - space model
