基于电磁波的散粒体粮堆储量探测关键技术研究

粮食库存数量的准确统计是国家粮食宏观调控的基础。为了解决目前粮仓储量人工清查效率低、开销大的缺点，基于电磁波理论的雷达储量检测方法以其穿透力强、设备轻便、检测快速等优点而备受重视。探地雷达以往多应用在土壤、混凝土等紧凑结构介质背景中的目标检测，而粮堆是具有流动性的散粒体介质，粮食颗粒对电磁波有明显的散射效应。本课题拟针对散粒体粮食颗粒的电磁波散射特性进行建模分析，研究散射回波对电磁探测图像的影响以及颗粒间散射波的杂波抑制技术；建立电磁波在异物填充粮堆中传播的正演模型，反演异物电磁参数，进行异物类型的识别判断；研究粮食密度-介电常数模型的水分校正方法，以及由重力作用所造成的散粒体密度分布不均匀的校正方法。拟通过对上述问题的研究，解决探地雷达在粮仓储量探测过程中出现的回波图像解释困难、粮面下异物无法准确识别以及粮食密度估计不准确等瓶颈问题，同时为探地雷达在散粒体背景介质中的应用提供理论支持。

The accurate statistics of the grain reserve number is the basic of macroeconomic regulation and control. Now, the verification method of real grain reserve number is still depend on manual weighing. This work is inefficient and costs a lot.The project is trying to deal with this problem. Recently,ground penetrating radae(GPR) based on electromegnetic thory has a widly used in many areas. It has many advantages as penetrating power, portable equipment, rapid detection and so on. The detection environmental of GPR is almost in compact structure like soil and concrete. Now, it was expected to be used in grain which is granular mixtures media with mobility. But the grain granula has obviously scatter effect of electromegnetic wave. So, firstly, the electromagnetic scattering model of granular grain will be set up and the clutter suppression method of barn should be found out. Secondly, the forward model of electromagnetic wave in the barn will be built and the kind of abnormal objects will be judged through parameters inverse. And then find out the method to correct the relationship model between permittivity and bulk density. This project is expected to solve the grain reserve detection problem by deal with the issues mentioned above and provide theoretical support for the application of ground penetrating radar in granular mixtures medium.