检索结果-南通市图书馆

vision-based adaptive variable rate spraying approach for unmanned aerial vehicles

International Journal of Agricultural and Biological Engineering 2019年第3期12卷 18-26页

作者： Linhui Wang Yubin Lan Xuejun Yue Kangjie Ling Zhenzhao Cen Ziyao Cheng Yongxin Liu Jian Wang International Laboratory of Agricultural Aviation Pesticide Spraying Technology(ILAAPST) Guangzhou 510642China College of Electronic Engineering South China Agricultural UniversityGuangzhou 510642China College of Engineering South China Agricultural UniversityGuangzhou 510642China School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China

The rapid developments of unmanned aerial vehicles(UAV)and vision sensor are contributing a great reformation in precision *** can fly their UAV spraying pesticides around their crop fields while staying at their remote control room or any place that is separated from their farm ***,there is a common phenomenon in rice planting management stage that some empty areas are randomly located in ***,a critical problem is that the waste of pesticides that occurs when spraying pesticides over rice fields with empty areas by using the common UAV,because it is difficult to control the flow accuracy based on the empty areas *** tackle this problem,a novel vision-based spraying system was proposed that can identify empty areas automatically while spraying a precise amount of pesticides on the target *** this approach,the image was preprocessed with the Lucy-Richardson algorithm,then the target area was split from the background with k-means and the feature parameters were extracted,finally the feature parameters were filtered out with a positive contribution which would serve as the input parameters of the support vector machine(SVM)to identify the target *** a fuzzy control model was analyzed and exerted to compensate the nonlinearity and hysteresis of the variable rate spraying *** results proved that the approach was applicable to reducing the amount of pesticides during UAV spraying,which can provide a reference for precision agriculture aviation in the future.

关键词： vision sensor UAV adaptive spray variable rate spraying fuzzy control empty area precision agriculture aviation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Second-order divided difference filter for vision-based relative navigation

引用

Journal of Harbin Institute of Technology(New Series) 2011年第3期18卷 16-20页

作者：王小刚崔乃刚郭继峰 Dept.of Astronautic Engineering Harbin Institute of Technology

A second-order divided difference filter (SDDF) is derived for integrating line of sight measurement from vision sensor with acceleration and angular rate measurements of the follower to estimate the precise relative position,velocity and attitude of two unmanned aerial vehicles (UAVs).The second-order divided difference filter which makes use of multidimensional interpolation formulations to approximate the nonlinear transformations could achieve more accurate estimation and faster convergence from inaccurate initial conditions than standard extended Kalman *** filter formulation is based on relative motion *** global attitude parameterization is given by quarternion,while a generalized three-dimensional attitude representation is used to define the local attitude *** results are shown to compare the performance of the second-order divided difference filter with a standard extended Kalman filter approach.

关键词： relative navigation second-order divided difference filter vision sensor unmanned aerial vehicle formation flight

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Terrain Data Real-Time Analysis Based on Point Cloud for Mars Rover

Terrain Data Real-Time Analysis Based on Point Cloud for Mar...

引用

2015年中国智能自动化学术会议

作者： Haoruo Zhang Yuanjie Tan Qixin Cao Institute of Robotics Shanghai Jiao Tong University

With the development of space exploration, more and more aerospace researchers pay attention to Mars and Mars rover that has a capability of autonomous navigation will gradually become the focus of the study. Above all, we need to realize a real-time modeling and analysis of unknown environment, providing necessary real-time information for Mars rover motion planning, and ultimately achieving autonomous navigation. First, the research content is briefly ***, visual sensor on Mars rover is used to acquire 3D point cloud area in realtime environment and 3D grid map is created to reduce the complexity of 3D map for real-time analysis. Third, relying on the established 3D grid map, terrain and environmental information are analyzed and identified and necessary information for Mars rover motion planning is provided.

关键词： vision sensor 3D point cloud 3D grid map Obstacle crossing possibility Obstacle feature

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：