發(fā)布時間：2018-03-15 00:14

  本文選題：變量噴霧　切入點：激光雷達(dá)掃描　出處：《農(nóng)業(yè)機(jī)械學(xué)報》2017年11期 　論文類型：期刊論文

【摘要】：為向變量噴霧系統(tǒng)施藥量的計算提供數(shù)據(jù)基礎(chǔ),提出了靶標(biāo)噴施區(qū)域葉面積密度參數(shù)的計算方法。靶標(biāo)三維點云數(shù)據(jù)由二維激光雷達(dá)傳感器沿果樹行直線運動間接獲取。在假設(shè)各噴施子區(qū)域內(nèi)葉片面積變化相對較小的條件下,基于Matlab曲線擬合工具箱cftool分析并驗證了點云數(shù)與葉片數(shù)之間存在函數(shù)關(guān)系。曲線擬合結(jié)果表明,利用高斯函數(shù)、多項式函數(shù)與指數(shù)函數(shù)擬合點云數(shù)與葉片數(shù),決定系數(shù)分別為0.925 7、0.931 0與0.936 4,指數(shù)函數(shù)擬合效果最好。相對誤差分析結(jié)果表明,基于3種擬合函數(shù),枝葉茂密區(qū)域相對誤差最小為11.46%,枝葉中等茂密區(qū)域相對誤差最小為11.05%,枝葉稀疏區(qū)域相對誤差最小為35.50%�；诖_定的點云數(shù)與葉片數(shù)間的函數(shù)方程,經(jīng)系數(shù)變換后可計算出葉面積密度參數(shù)。
[Abstract]:To provide a data basis for the calculation of the amount of pesticide applied to a variable spray system, A method for calculating the leaf area density parameters of target sprayed area is presented. The 3D point cloud data of target are obtained indirectly by two-dimensional lidar sensor moving in a straight line along the fruit tree. The change phase of leaf area is assumed to be within each sprayed sub-region. For smaller conditions, Based on Matlab curve fitting toolbox cftool, the function relationship between point cloud number and blade number is analyzed and verified. The curve fitting results show that point cloud number and leaf number are fitted by Gao Si function, polynomial function and exponential function. The determination coefficients are 0.925 7 / 0.931 0 and 0.936 4, respectively. The results of relative error analysis show that, based on the three fitting functions, the exponential function is the best. The minimum relative error in the dense region of branches and leaves is 11.46%, the minimum relative error in the middle dense region of branches and leaves is 11.05, and the minimum relative error in sparse region of branches and leaves is 35.50.Based on the function equation between the number of point clouds and the number of leaves, The parameters of leaf area density can be calculated by coefficient transformation.
【作者單位】： 江蘇省農(nóng)業(yè)科學(xué)院農(nóng)業(yè)設(shè)施與裝備研究所;南京農(nóng)業(yè)大學(xué)工學(xué)院;江蘇省農(nóng)業(yè)科學(xué)院園藝所;
【基金】：國家梨產(chǎn)業(yè)技術(shù)體系專項(CARS-29-18) 江蘇省農(nóng)業(yè)科技自主創(chuàng)新資金項目(CX(15)1023) 江蘇省農(nóng)業(yè)科學(xué)院基本科研業(yè)務(wù)費專項(ZX(16)3006)
【分類號】：S49;TN958.98
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本文編號：1613571