發(fā)布時間：2018-03-18 05:24

  本文選題：連環(huán)碰撞　切入點：Android　出處：《北京理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著經(jīng)濟的發(fā)展，人民生活水平的提高，汽車越來越多的飛入尋常百姓家。但是汽車在給人們生活帶來便利的同時，也給不少家庭和社會帶來嚴重的影響。交通事故的發(fā)生，尤其是嚴重的交通事故，不僅僅意味著經(jīng)濟的損失，還可能帶來家破人亡的后果。因此任何避免或者緩解交通事故的方法都應取得高度的重視。 高速公路的連環(huán)碰撞是最容易產(chǎn)生特大交通事故的，但若在第一輛車發(fā)生碰撞后就向后車發(fā)送警報，，就能夠有效緩解碰撞帶來的損失。要實現(xiàn)這個功能需要有碰撞檢測裝置、GPS定位功能、發(fā)送信息的無線通訊裝置以及車聯(lián)網(wǎng)這樣的大環(huán)境。而具有高度開放性的Android系統(tǒng)的智能手機不僅具有檢測碰撞的傳感器，還具備GPS定位模塊以及無線通信模塊，且手機隨時隨地都攜帶在身邊，手機的加速度變化也能反映車輛的加速度變化。而基于這些條件，本論文提出了高速公路異常事件識別系統(tǒng)。系統(tǒng)的主要功能有數(shù)據(jù)采集、數(shù)據(jù)分析、信息的傳輸。手機終端進入路段后通過車聯(lián)網(wǎng)和中心服務器以及其他手機終端進行暫時的連接。加速度傳感器實時采集手機加速度信息，對數(shù)據(jù)進行實時保存和處理。本論文提出了的基于時間窗口和速度的閾值判別算法，通過閾值實時判斷車輛行駛狀態(tài)。若加速度過大，則直接將事件定義為嚴重碰撞，需要報警并發(fā)送求救信號。若加速度處于正常行駛于嚴重碰撞之間，則引入速度參數(shù)。加速度在該區(qū)間內(nèi)被判斷發(fā)生異常時，僅僅需要發(fā)送警報，并不需要發(fā)送求救信號。通過調(diào)試，本系統(tǒng)在異常情況時能及時發(fā)送警報，且信號延時較小，在1s之內(nèi)，取得了良好的實驗效果。本系統(tǒng)表明智能手機在智能交通應用中有著較高的可行性和實用性，具有廣泛的前景。
[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.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U495

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