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基于智能手机群的车辆事故自救系统 总被引:1,自引:0,他引:1
针对目前现有汽车事故自救系统需要装配特定的传感器、GPS及通信模块的缺点, 设计了一种基于智能手机群的自动碰撞与坠落检测及事故自救系统. 该系统以事故车内多部智能手机用户物理运动的加速度信号为输入样本,以多个加速度数据为依据计算阀值, 不但使得事故判断的准确度显著提高还降低了严重事故时单个车载装置或手机损毁无法实现呼救可能性. 当信号超过阀值后, 自动借助手机的拍照、GPS定位、3G联网功能实现向救援中心报警求救. 在Android平台实现原型系统. 实验结果表明, 该系统具有非常好的碰撞及坠落识别准确度 相似文献
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提出了一种基于无线传感器网络的监测技术,设计并实现了一套用于危险品在途监测的实时动态车载系统;该系统利用各类专业传感器检测危险品的物理状态信息,各传感器节点自主组网实现数据的采集上报;还利用陀螺仪检测车辆的运行姿态,并引入全球定位系统和地理信息系统的相关技术实现车辆的全程跟踪和轨迹绘制;最后通过无线通信实现车载系统与监控中心的数据访问与传输;车载系统向用户提供接入认证、导航、远程查询及自动报警等功能.道路测试证明系统工作可靠. 相似文献
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公交车辆的监控和调度系统 总被引:1,自引:1,他引:0
开发了一个简易多功能的公交车辆监控和调度系统,系统由多功能车载终端和监控调度软件组成;车载终端由超低功耗单片机MSP430F1611、GPS、GPRS和自动计数等模块组成,该终端以最低的硬件资源实现了远程监控、自动报站和超速报警等多项功能;监控调度软件结合GIS平台和智能调度管理,实现对车辆实时动态地监控和智能调度;TCP/IP通讯协议保证了数据交换的实时性和准确性;系统测试证明了该系统的可靠性和稳定性. 相似文献
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郭键 《计算机测量与控制》2017,25(9)
为对物流车辆进行精准定位、检测和实时跟踪,需要物流车辆智能监控系统设计。当前使用的监控系统,在物流车辆进行运输的过程中,有遮挡物出现时无法精准的对物流车辆进行定位,当物流车辆停放在室内停车场时可能出现定位不到物流车辆的情况。为此,提出一种基于GPS的物流车辆智能监控系统设计方案。该系统硬件部分包括:GPS车载终端、监控中心服务器群和控制终端三部分,同时将全球定位系统与地理道路信息相结合,利用联通网络与国际互联网传输相关信息;系统软件部分使用联通分组通信技术,通过GIS软件与管理信息系统进行无缝连接,并由单片机S3C2440A向GPS模块发送控制中心下达指令,GPS接收指令并给予反馈,通过有效的分析反馈结果来提高监控终端的运行速度、稳定性以及精准度;GPS定位功能采用TDOA算法对物流车辆进行定位。实验证明,所提系统可以对物流车辆精准定位、实时监测和有效跟踪。 相似文献
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为了减少高速公路交通事故的发生, 设计了一种能够监控高速公路上车辆行驶状况的系统. 该系统利用GPS采集车辆的行驶信息, 而后通过GPRS将数据传送至服务器, 服务器用特定预警算法对车辆自身以及周围车辆的行驶状况进行判断, 若发现有违规驾驶行为, 则向司机进行自动预警. 在实现系统的同时, 分别对服务器内存资源的调度以及车载终端异常断开的问题提出了改进处理方案. 最后, 在局域网内搭建仿真环境, 对该系统的稳定性、预警事件的处理效率以及预警的准确性进行了测试, 结果表明该系统具有较高的稳定性和预警准确性, 对高速公路监管系统的进一步实现具有很大的参考价值. 相似文献
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基于单目视觉的车辆碰撞预警系统能够发现道路前方的车辆并估算出与前方车辆之间的距离,利用预警机制及时提醒驾驶员危险状况。车道检测和车辆识别是该系统需要解决的两个主要难题,提出了利用边缘分布函数EDF检测车道标线,利用车辆底部纹理和对称性特征识别车辆,并根据图像坐标系和世界坐标系之间的几何映射关系测距。实验结果表明,提出的方法能够有效检测出车道标线,并能很好地测定与前车的距离。 相似文献
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Younés Abbassi Youcef Ait-Amirat Rachid Outbib 《International journal of systems science》2013,44(16):2873-2886
This paper mainly studies nonlinear feedback control applied to the nonlinear vehicle dynamics with varying velocity. The main objective of this study is the stabilisation of longitudinal, lateral and yaw angular vehicle velocities. To this end, a nonlinear vehicle model is developed which takes both the lateral and longitudinal vehicle dynamics into account. Based on this model, a method to build a nonlinear state feedback control is first designed by which the complexity of system structure can be simplified. The obtained system is then synthesised by the combined Lyapunov–LaSalle method. The simulation results show that the proposed control can improve stability and comfort of vehicle driving. Moreover, this paper presents a lemma which ensures the trajectory tracking and path-following problem for vehicle. It can also be exploited simultaneously to solve both the tracking and path-following control problems of the vehicle ride and driving stability. We also show how the results of the lemma can be applied to solve the path-following problem, in which the vehicle converges and follows a designed path. The effectiveness of the proposed lemma for trajectory tracking is clearly demonstrated by simulation results. 相似文献
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由于车标的背景散热器栅格形状大小不一、颜色不定、背景多样,因此导致了车标定位的困难,故精确分类散热器栅格是准确定位车标的基础。提出了一种基于散热器栅格背景精确分类的车标定位方法,首先依照车牌与车标空间位置关系确定车标粗定位,然后依据栅格纹理特征,利用霍夫变换和灰度值的梯度变化确定散热器栅格背景的类别,进而通过不同算子分别对不同种类栅格背景进行背景消融;为了保证多种光照条件下的准确定位,引入离散度,并将其与大津法进行融合,形成一种适用于车标定位的自适应二值化方法,同时结合形态学对栅格背景进一步处理,得到准确的车标定位。这种方法适用于在不同光照强度和不同类型的车标背景条件下,对车标进行定位。对10类车标、30类散热器栅格共1 200张图像进行车标定位,实验结果显示,图像总体的车标定位准确率可以达到97.67%。 相似文献
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Magnetic sensors can be applied in vehicle recognition. Most of the existing vehicle recognition algorithms use one sensor node to measure a vehicle’s signature. However, vehicle speed variation and environmental disturbances usually cause errors during such a process. In this paper we propose a method using multiple sensor nodes to accomplish vehicle recognition. Based on the matching result of one vehicle’s signature obtained by different nodes, this method determines vehicle status and corrects signature segmentation. The co-relationship between signatures is also obtained, and the time offset is corrected by such a co-relationship. The corrected signatures are fused via maximum likelihood estimation, so as to obtain more accurate vehicle signatures. Examples show that the proposed algorithm can provide input parameters with higher accuracy. It improves the av-erage accuracy of vehicle recognition from 94.0%to 96.1%, and especially the bus recognition accuracy from 77.6%to 92.8%. 相似文献
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In this paper, we develop a novel framework, called Monitoring Vehicle Outliers based on a Clustering technique (MVOC), for monitoring vehicle outliers caused by complex vehicle states. The vehicle outlier monitoring is a method to continuously check the current vehicle conditions. Most of previous monitoring methods have conducted simple operations depending on uncomplicated analyses or expected lifetimes in regard to vehicle components. However, many serious vehicle outliers such as turning off during a drive result from the complex vehicle states influenced by correlated components. The proposed method monitors the current vehicle conditions based on not simple components like the previous methods but more complex and various vehicle states using a clustering technique. We perform vehicle data clustering and then analyze the generated clusters with information of vehicle outliers caused by complex correlations of vehicle components. Thus, we can learn vehicle information in more detail. To facilitate MVOC, we also propose related techniques such as sampling cluster data with representative attributes and deciding cluster characteristics on the basis of relations between vehicle data and states. Then, we demonstrate the performance of our approach in terms of monitoring vehicle outliers on the basis of real complex correlations between outliers and vehicle data through various experiments. Experimental results show that the proposed method can not only monitor the complex outliers by predicting their occurrence possibilities in advance but also outperform a standard technique. Moreover, we present statistical significance of the results through significance tests. 相似文献
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设计了一套车载终端平台,该平台利用LPC2138采集GPS模块提供的移动车辆行驶信息,通过GPRS模块与Internet建立无线通信链路进行数据传送,已连接Internet的服务器可实时获知车载终端发送的信息,实现对远近程车辆的定位与监控;介绍了车载平台的工作原理,硬件平台的构建及软件设计,最后结合跑车试验,验证了该设计的可行性。 相似文献
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《Advances in Engineering Software》2002,33(7-10):541-552
The paper describes the development of a virtual vehicle system using virtual prototyping computer tools. The virtual vehicle is used for the prediction of the structural dynamics. Since the modelling process for complete rail vehicle systems becomes increasingly more complex, time and cost can be saved by the use of a database concept and an automated assembling process for the vehicle of interest.Supported by a modular design concept, vehicle components for a metro train have been modelled and stored as substructures in a specific vehicle component database. Using this database, train configurations up to a three-car train can be assembled very quickly to perform structural dynamics analyses and to predict the ride comfort.Experimental results have been compared with simulation results of the rail vehicle to improve the modelling technique and the accuracy of the developed virtual vehicle system.The mathematical modelling of the rail vehicle system featuring elastic components, the structure of the database as well as numerical and experimental results are presented in this paper. 相似文献
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基于神经网络和颜色特征的车牌字符分割方法 总被引:3,自引:0,他引:3
论文提出了一种基于神经网络和颜色特征的车牌字符分割方法。在颜色空间中利用树型判决结构,首先由亮度信息识别出车牌区域中的白色、黑色像素,然后利用网络对车牌区域中的蓝、红、黄色以及其他颜色进行识别。根据车牌的颜色特征,在判断出车牌的类型后,对车牌区域进行二值化处理。去除车牌边框和柳钉后,综合利用投影法和字符的连通性来分割车牌字符。实验结果表明,该方法是有效的。 相似文献
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车辆群体行为态势能够准确描述车辆在车联网中的运动规律,车联网中GPS信号强的车辆可以利用通信能力、邻居位置关系,对位于一定距离范围内、出行目的地相同或相近、GPS信号弱的车辆进行实时位置计算。该方法首先提出车辆目的地伴随标签的标签簇划分算法,将有相同或相近目的地的车辆,其目的地视做标签,通过挖掘标签重叠结构与层次结构划分至同一标签簇,使之聚类成为车辆群体;然后提出基于标签划分结果的定位算法与结果修正算法,对亟待定位的车辆进行实时位置计算。实验结果表明,该方法较同类方法定位误差降低15%~35%,不同交通状况结果稳定性提高25%以上,所以提出的定位方法是有效的。 相似文献