Application Of Tree Radar In Detection Of Defects In Old Trees In The Summer Palace

Due to the deterioration of ecological environment and invasion of the outside world,the trees which are growing in Summer Palace,will become decayed or empty inside,even died,and then resulting in immeasurable losses.Therefore,it is necessary to detect and evaluate the internal situation of trees effectively in the early stage of tree damage.At present,the main detection methods include stress wave,CT scanning,radar wave,etc.,the radar wave detection technology is more and more widely used because of its fast,nondestructive and other characteristics.However,due to the complex structural characteristics of trees.At the same time,the evaluation criteria of the radar detection results depend largely on the subjectivity of the technicians.So it is difficult to obtain the ideal effect in the practical application process.Therefore,it is of great practical significance to research the forward models of the internal structure of trees by computer technology.This paper,which is based on the theory of radar wave and forward modeling as well as FDTD,studies the radar wave propagation law and the imaging rule of the reflected wave in the structure of the internal defects of different shapes,different parts and different sizes using GprMax and Matlab programming to simulate the internal structure of trees,at the same time,discussed the influence of the change of a single parameter on radar wave propagation and imaging;data acquisition and processing results are obtained by using radar equipment,studies the accuracy of forward modeling through analyzing the similarities and differences between the forward results and the measured results,and then further modify the parameters,enrich the forward simulation data.Through the analysis of the results,using Myeclipse and Tomcat server,with the help of Bootstrap framework and high moral map development platform,to build the Summer Palace ancient information management system and to display the location of the ancient trees,photos,Treewin and BJFU-TGPR results and other information visually on the basis of map.The results of this study provide a basis for the extensive application of radar wave technology in the detection of trees,and provide a theoretical guidance and the protection of the ancient and famous trees.