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车辆视频导航中道路检测方法研究进展 总被引:1,自引:0,他引:1
视频导航以其获取信息丰富、对环境影响小、成本低廉等诸多优点成为了辅助车辆自动驾驶和陆地自主车(ALV)常用的一种自动导航方式,而从视频导航图像中检测出道路区域则是实现视频导航的基础和关键。对近年来车辆视频导航过程中道路检测的实现算法进行了回顾和分析,并对道路检测算法以后的研究方向进行了探讨。 相似文献
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设计一种陆地车辆对抗演示系统,该系统主要包括图像采集单元、上位机控制处理平台单元、无线传输单元、驱动控制单元、对抗判决系统单元和敌我识别系统单元;设计中采用4辆车辆(2对2模式)进行对抗实验,实验表明设计的陆地车辆对抗演示系统可以实现对前方环境和对方对阵情况的实时图像获取和处理、显示、无线收发控制、计算、轨迹控制、特征识别、定位、文件管理、数据传输、生命值显示以及声音报警等功能;实验对抗结果:乙方两辆车4个生命值显示灯全部熄灭,甲方对抗胜利. 相似文献
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自主车辆的研制过程中,应用仿真的方法,对控制器进行分析设计是一个重要阶段。在对控制器性能进行评价时,控制对象的选择是一个关键的问题,可视化的控制对象,有形象直观,易于理解的优点,可以简化评价的过程。该文以汽车理论为基础,结合自主车辆的研制,应用虚拟现实技术,实现了一个车辆动力学模型的仿真系统,重点介绍了车辆的纵向、侧向动力学模型,在这些模型的基础上,实现了车辆动力学模型与几何模型的结合。文章最后介绍了作者利用该仿真系统进行的一些研究工作。 相似文献
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基于MVB的机车逻辑控制单元 总被引:1,自引:0,他引:1
研究基于多功能车辆总线(MVB)的机车逻辑控制单元,分析了目前国内外多功能车辆总线的发展状况及自主研制MVB总线控制器及MVB网络接口卡对于我国轨道交通的现实意义,介绍了基于MVB总线的机车逻辑控制单元的系统结构,重点研究了MVB网络接口单元的构造及功能;以自主开发的MVB总线控制器为核心,设计研制了一种MVB总线的网络接口卡,为设备与MVB总线提供通信手段,利用TMS320LF2407实现数据的处理及设备与MVB总线的通讯控制;实验证明,该方案完全可行。 相似文献
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针对在动态环境中自主车辆对于动态障碍物信息很难具有先验知识的问题,研究了动态贝叶斯网络模型对机动目标运动状态进行贝叶斯预测的推理机理,提出了一种基于贝叶斯预测进行自主车辆避障路径规划控制方法;该规划方法在VORONOI图法基础上,融合了对自主车辆和周围环境之间的位置荚系的贝叶斯预测,一旦预定任务的动态环境发生重大变化,它可以产生机动目标沿某方向前进信息的预测先验知识,通过局部多次重规划生成避障路径,直至自主车辆完成既定任务;仿真实验证明了该规划控制方法可有效帮助自主车辆在不确定环境中实施避障策略. 相似文献
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刘建 《计算机测量与控制》2011,19(12)
从现有车辆导航系统的基本原理和组成出发,结合我国自主的北斗卫星导航系统,综合应用通信、控制、GIS等多种技术,提出了一种兼容自主式和中心式车辆导航系统的设计,并重点讨论了控制中心和移动终端的实现方案,控制中心通过采集实时交通信息,进行分析处理后形成最优的路径规划,移动终端根据自身所在的位置区域获取相应的诱导信息,使城市的交通流趋向最优分布,减少车辆在道路上的逗留时间,从而有效地改善城市交通状况,减少交通拥堵. 相似文献
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Action Language is a specification language for reactive software systems. In this paper, we present the syntax and the semantics
of the Action Language and we also present an infinite-state symbolic model checker called Action Language Verifier (ALV)
that verifies (or falsifies) CTL properties of Action Language specifications. ALV is built on top of the Composite Symbolic
Library, which is a symbolic manipulator that combines multiple symbolic representations. ALV is a polymorphic model checker
that can use different combinations of the symbolic representations implemented in the Composite Symbolic Library. We describe
the heuristics implemented in ALV for computing fixpoints using the composite symbolic representation. Since Action Language
specifications allow declaration of unbounded integer variables and parameterized integer constants, verification of Action
Language specifications is undecidable. ALV uses several heuristics to conservatively approximate the fixpoint computations.
ALV also implements an automated abstraction technique that enables parameterized verification of a concurrent system with
an arbitrary number of identical processes. 相似文献
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A knowledge-based navigation system for autonomous land vehicles (ALVs) has been developed which can successfully negotiate an obstacle and threat-laden terrain, even if nothing is known beforehand about the terrain. The ALV stores new information in its memory as it travels, has the ability to backtrack out of unexpected dead ends, and performs spontaneous decision making in the field based on local sensor readings. The optimal global route of the ALV journey is obtained using dynamic programming, and decision making is accomplished via a production rule-based system. Execution examples demonstrate the power of the prototype system to solve navigation problems. This establishes the feasibility of constructing a valid ALV by combining search techniques with artificial intelligence tools such as production rule-based systems. 相似文献
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A vision-based approach to unsupervised learning of the indoor environment for autonomous land vehicle (ALV) navigation is proposed. The ALV may, without human's involvement, self-navigate systematically in an unexplored closed environment, collect the information of the environment features, and then build a top-view map of the environment for later planned navigation or other applications. The learning system consists of three subsystems: a feature location subsystem, a model management subsystem, and an environment exploration subsystem. The feature location subsystem processes input images, and calculates the locations of the local features and the ALV by model matching techniques. To facilitate feature collection, two laser markers are mounted on the vehicle which project laser light on the corridor walls to form easily detectable line and corner features. The model management subsystem attaches the local model into a global one by merging matched corner pairs as well as line segment pairs. The environment exploration subsystem guides the ALV to explore the entire navigation environment by using the information of the learned model and the current ALV location. The guidance scheme is based on the use of a pushdown transducer derived from automata theory. A prototype learning system was implemented on a real vehicle, and simulations and experimental results in real environments show the feasibility of the proposed approach. 相似文献
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VITS-a vision system for autonomous land vehicle navigation 总被引:11,自引:0,他引:11
Turk M.A. Morgenthaler D.G. Gremban K.D. Marra M. 《IEEE transactions on pattern analysis and machine intelligence》1988,10(3):342-361
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非完整自主车基于圆轨迹的道路避障 总被引:2,自引:0,他引:2
本文就四轮非完整自主车提出了一种基于圆轨迹的道路避障策略.先将道路上
的障碍按照障碍距离自主车的远近划分层次,使一个层次的障碍能在自主车视场中全部出现
.然后给出基于圆轨迹的避障算法,即自主车沿由自主车出发位姿和子目标点确定的圆弧轨
迹走行.在此之前推导四轮非完整车的运动模型为提出避障策略的基础准备.尽量减小自主
车在走行过程中运动状态的改变,基于圆轨迹避障策略能够很好地满足这一要求.最后引入
代价函数,给出对于此方法的评价,体现了本方法的优越性. 相似文献
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Ching-Heng Ku Wen-Hsiang Tsai 《IEEE transactions on systems, man, and cybernetics. Part B, Cybernetics》1999,29(3):416-426
A vision-based approach to obstacle avoidance for autonomous land vehicle (ALV) navigation in indoor environments is proposed. The approach is based on the use of a pattern recognition scheme, the quadratic classifier, to find collision-free paths in unknown indoor corridor environments. Obstacles treated in this study include the walls of the corridor and the objects that appear in the way of ALV navigation in the corridor. Detected obstacles as well as the two sides of the ALV body are considered as patterns. A systematic method for separating these patterns into two classes is proposed. The two pattern classes are used as the input data to design a quadratic classifier. Finally, the two-dimensional decision boundary of the classifier, which goes through the middle point between the two front vehicle wheels, is taken as a local collision-free path. This approach is implemented on a real ALV and successful navigations confirm the feasibility of the approach. 相似文献