垂直陀螺仪是无人机重要的飞行姿态传感器,其在飞行过程中实时获取无人机的飞行姿态信息,因而其故障检测对在线性有着很高的要求;最小二乘支持向量机(Least Squares Support Vector Machine,LS-SVM)相比于支持向量机的具有训练速度快、...垂直陀螺仪是无人机重要的飞行姿态传感器,其在飞行过程中实时获取无人机的飞行姿态信息,因而其故障检测对在线性有着很高的要求;最小二乘支持向量机(Least Squares Support Vector Machine,LS-SVM)相比于支持向量机的具有训练速度快、计算复杂度和需要内存少的特点,且能够扩展为自回归的形式来处理动态问题;因此文章采用基于在线增量小波LS-SVM建立无人机垂直陀螺仪动态模型,实时获得实际值与模型预测值之间的残差,并依据残差对陀螺仪进行在线故障检测;实验结果表明,该方法能够对陀螺仪实现快速精确的在线检测。展开更多
To monitor growth and predict the yield of rice over a large area, the chlorophyll contents in the rice canopy were estimated using the unmanned aerial vehicle(UAV) remote sensing technology. In this work, multi-spect...To monitor growth and predict the yield of rice over a large area, the chlorophyll contents in the rice canopy were estimated using the unmanned aerial vehicle(UAV) remote sensing technology. In this work, multi-spectral image information of the rice crop was obtained using a 6-channel multi-spectral camera mounted on a fixed wing UAV, which was flown 600 m above the ground, between 11: 00-14: 00 on a sunny day in summer. The measured chlorophyll values were collected as sample sets. The s-REP index was screened out to estimate chlorophyll contents through the analysis of six kinds of spectral indexes of chlorophyll estimated capacity. An inversion model of the chlorophyll contents was then built using the least square support vector regression(LS-SVR)algorithm, with calibration and prediction R-square values of 0.89 and 0.83, respectively. Finally, remote sensing mapping for a UAV image of the Fangzheng County Dexter Rice Planting Park was accomplished using the inversion model. The inversion and measured values were then compared using regression fitting. R-square and root-mean-square error of the fitting model were 0.79 and 2.39,respectively. The results demonstrated that accurate estimation of rice-canopy chlorophyll contents was feasible using the LS-SVR inversion model developed using the s-REP vegetation index.展开更多
文摘垂直陀螺仪是无人机重要的飞行姿态传感器,其在飞行过程中实时获取无人机的飞行姿态信息,因而其故障检测对在线性有着很高的要求;最小二乘支持向量机(Least Squares Support Vector Machine,LS-SVM)相比于支持向量机的具有训练速度快、计算复杂度和需要内存少的特点,且能够扩展为自回归的形式来处理动态问题;因此文章采用基于在线增量小波LS-SVM建立无人机垂直陀螺仪动态模型,实时获得实际值与模型预测值之间的残差,并依据残差对陀螺仪进行在线故障检测;实验结果表明,该方法能够对陀螺仪实现快速精确的在线检测。
基金Supported by the National Key R&D Program of China(2016YFD0300610)
文摘To monitor growth and predict the yield of rice over a large area, the chlorophyll contents in the rice canopy were estimated using the unmanned aerial vehicle(UAV) remote sensing technology. In this work, multi-spectral image information of the rice crop was obtained using a 6-channel multi-spectral camera mounted on a fixed wing UAV, which was flown 600 m above the ground, between 11: 00-14: 00 on a sunny day in summer. The measured chlorophyll values were collected as sample sets. The s-REP index was screened out to estimate chlorophyll contents through the analysis of six kinds of spectral indexes of chlorophyll estimated capacity. An inversion model of the chlorophyll contents was then built using the least square support vector regression(LS-SVR)algorithm, with calibration and prediction R-square values of 0.89 and 0.83, respectively. Finally, remote sensing mapping for a UAV image of the Fangzheng County Dexter Rice Planting Park was accomplished using the inversion model. The inversion and measured values were then compared using regression fitting. R-square and root-mean-square error of the fitting model were 0.79 and 2.39,respectively. The results demonstrated that accurate estimation of rice-canopy chlorophyll contents was feasible using the LS-SVR inversion model developed using the s-REP vegetation index.
