车联网环境下高速公路异常事件识别系统

发布时间：2018-03-18 05:24

本文选题：连环碰撞　切入点：Android　出处：《北京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着经济的发展，人民生活水平的提高，汽车越来越多的飞入寻常百姓家。但是汽车在给人们生活带来便利的同时，也给不少家庭和社会带来严重的影响。交通事故的发生，尤其是严重的交通事故，不仅仅意味着经济的损失，还可能带来家破人亡的后果。因此任何避免或者缓解交通事故的方法都应取得高度的重视。高速公路的连环碰撞是最容易产生特大交通事故的，但若在第一辆车发生碰撞后就向后车发送警报，，就能够有效缓解碰撞带来的损失。要实现这个功能需要有碰撞检测装置、GPS定位功能、发送信息的无线通讯装置以及车联网这样的大环境。而具有高度开放性的Android系统的智能手机不仅具有检测碰撞的传感器，还具备GPS定位模块以及无线通信模块，且手机随时随地都携带在身边，手机的加速度变化也能反映车辆的加速度变化。而基于这些条件，本论文提出了高速公路异常事件识别系统。系统的主要功能有数据采集、数据分析、信息的传输。手机终端进入路段后通过车联网和中心服务器以及其他手机终端进行暂时的连接。加速度传感器实时采集手机加速度信息，对数据进行实时保存和处理。本论文提出了的基于时间窗口和速度的阈值判别算法，通过阈值实时判断车辆行驶状态。若加速度过大，则直接将事件定义为严重碰撞，需要报警并发送求救信号。若加速度处于正常行驶于严重碰撞之间，则引入速度参数。加速度在该区间内被判断发生异常时，仅仅需要发送警报，并不需要发送求救信号。通过调试，本系统在异常情况时能及时发送警报，且信号延时较小，在1s之内，取得了良好的实验效果。本系统表明智能手机在智能交通应用中有着较高的可行性和实用性，具有广泛的前景。
[Abstract]:With the development of economy and the improvement of people's living standard, more and more cars are flying into the homes of ordinary people. However, cars not only bring convenience to people's lives, but also bring serious effects to many families and society. Especially the serious traffic accident, not only means the economic loss, but also may bring about the result that the family is broken down. Therefore, any method to avoid or alleviate the traffic accident should be paid more attention. A serial collision on a highway is the most likely to cause a major traffic accident, but if an alarm is sent to the back car after the first collision, To achieve this function, a collision detection device and a GPS positioning function are required. The wireless communication device that sends the information and the environment such as the car networking. The smart phone with the highly open Android system not only has the sensor to detect the collision, but also has the GPS localization module and the wireless communication module. The mobile phone is always around, and the acceleration of the mobile phone can also reflect the acceleration change of the vehicle. Based on these conditions, this paper proposes a highway anomaly event recognition system. The main functions of the system are data acquisition. Data analysis, information transmission. Mobile phone terminal after entering the road, through the car network and central server and other mobile phone terminals for temporary connection. Acceleration sensor real-time acquisition of mobile phone acceleration information, In this paper, a threshold algorithm based on time window and velocity is proposed to determine the driving state of a vehicle in real time. If the acceleration is too large, the event is defined as a serious collision directly. Need to alarm and send a distress signal. If the acceleration is running normally between severe collisions, the velocity parameter is introduced. When the acceleration is judged to be abnormal within the range, only an alarm is sent. After debugging, the system can send alarm in time in case of abnormal condition, and the delay of signal is relatively small, within 1 s. The system shows that the smart phone has high feasibility and practicability in the application of intelligent transportation, and has a wide prospect.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U495

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