【摘要】：針對(duì)活立木內(nèi)部結(jié)構(gòu)復(fù)雜,個(gè)體化差異較大,導(dǎo)致雷達(dá)波圖像難以解析的問題,提出了一種基于振幅比在線估計(jì)相對(duì)介電常數(shù)以及利用希爾伯特積進(jìn)行層位追蹤實(shí)現(xiàn)缺陷界面的相對(duì)定位,并結(jié)合活立木外輪廓點(diǎn)云數(shù)據(jù)確定其內(nèi)部缺陷絕對(duì)位置和分布表征的方法,以此開發(fā)了基于雷達(dá)波的活立木內(nèi)部結(jié)構(gòu)缺陷分析軟件。采用基于時(shí)域有限差分法的正演模擬、實(shí)驗(yàn)室原木試件檢測(cè)分析、頤和園現(xiàn)場(chǎng)活立木檢測(cè)等實(shí)驗(yàn)驗(yàn)證方法的可行性。結(jié)果表明可對(duì)檢測(cè)目標(biāo)點(diǎn)準(zhǔn)確定位,復(fù)現(xiàn)樹干內(nèi)部橫截面圖像,雷達(dá)波成像結(jié)果與古樹復(fù)壯時(shí)內(nèi)部實(shí)際結(jié)構(gòu)相符。
[Abstract]:Aiming at the problem that the internal structure of the living tree is complex and the individual difference is great, it is difficult to analyze the radar wave image. Based on amplitude ratio on-line estimation of relative dielectric constant and using Hilbert product to realize the relative localization of defect interface, a new method is proposed. Combined with the method of determining the absolute position and distribution of internal defects, a software based on radar wave is developed to analyze the defects of the inner structure of standing trees. Forward modeling based on finite-difference time-domain method (FDTD), laboratory log testing and analysis, and the Summer Palace field test were used to verify the feasibility of the method. The results show that the target points can be accurately located and the cross section images of trunk can be reproduced. The results of radar wave imaging are consistent with the actual structure of the ancient trees when they are rejuvenated.
【作者單位】： 北京林業(yè)大學(xué)工學(xué)院;北京市頤和園管理處;
【基金】：中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(2017ZY27) 國(guó)家自然科學(xué)基金項(xiàng)目(31600589)
【分類號(hào)】：TN957.52

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