基于地磁的车辆探测系统研制

发布时间：2018-05-24 01:33

本文选题：无线扩频(LoRa) + 车辆检测　；参考：《中国科学院大学(中国科学院工程管理与信息技术学院)》2017年硕士论文

【摘要】：城市的现代化,使人民的生活水平大幅度提高,机动车持有量的激增,停车难,道路拥挤,严重影响中国经济和人民的生活质量。准确探测停车场、路边、道路车辆的通行状况等情况,并做出相应的决策,将会从根本上解决停车难和道路拥挤的问题,鉴于此,本文基于地磁设计开发一种高精度的车辆检测系统,实时监测泊车位停车和道路通行状况。本文在综合研究了地磁探测算法与无线扩频技术的基础上,设计出一套长通信距离、高准确率、低功耗的无线地磁探测系统,针对严重影响地磁车辆检测器的几个问题进行研究,本文主要工作包括:(1)基于地磁数据采集,实时探测车流量、车速和停车位状态等信息。设计加权函数修正基准,自适应算法自动实时更新基准和状态参数,滤波算法过滤相邻车辆干扰。通过实际测试,车流量准确率可达98.8%以上,车位检测率可达99.5%。(2)将最新的Lo Ra无线扩频通信技术与地磁车辆探测相结合,构建了一个基于AMR(Anisotropic Magneto Resistive)传感器的远距离通信的无线智能车探测系统及硬件设计,改善了现有地磁传感系统的通信距离短的缺点。(3)本系统以低功耗硬件设计为基础,再通过设计软件算法对各功能模块工作状态的合理切换,实现系统电源的低功耗方案,为系统长时间稳定工作奠定了基础。系统最终实现可以在极限压力状态下连续工作5~8年。系统由无线地磁传感器、中继器和数据接收网关组成。无线地磁车辆检测节点检测到车辆引起的地球磁场强度变化,算法处理后经专用网关传送到采集中心通过交通数据管理软件的分析,对提高城市道路的通行能力、缓解城市交通拥堵将会起到一定的作用。
[Abstract]:The modernization of the city has greatly improved the living standards of the people, increased the number of motor vehicle holdings, difficult parking and congested roads, seriously affecting the Chinese economy and the quality of life of the people. Accurate detection of parking lots, roadside and road traffic conditions and making corresponding decisions will fundamentally solve the problem of difficult parking and congested roads. In this paper, based on geomagnetic design, a high precision vehicle detection system is developed to monitor parking and road traffic status in real time. Based on the research of geomagnetic detection algorithm and wireless spread spectrum technology, a wireless geomagnetic detection system with long communication distance, high accuracy and low power consumption is designed in this paper. In this paper, the main work includes: 1) based on geomagnetic data acquisition, real-time detection of vehicle flow, speed and parking space status information. The weighting function is designed to modify the benchmark, the adaptive algorithm automatically updates the reference and state parameters in real time, and the filter algorithm filters the adjacent vehicle interference. Through actual test, the accuracy of vehicle flow can reach 98.8%, and the detection rate of parking space can reach 99.5%.) the latest Lo Ra wireless spread spectrum communication technology is combined with geomagnetic vehicle detection. A wireless intelligent vehicle detection system and hardware design for long-distance communication based on AMR(Anisotropic Magneto resistive sensor is constructed, which improves the shortcoming of short communication distance of the existing geomagnetic sensing system.) the system is based on the low power hardware design. By designing the software algorithm to switch the working state of each function module reasonably, the low power consumption scheme of the system power supply is realized, which lays the foundation for the system to work stably for a long time. Finally, the system can work continuously for 5 ~ 8 years under the limit pressure. The system consists of wireless geomagnetic sensor, repeater and data receiving gateway. Wireless geomagnetic vehicle detection node detects the change of geomagnetic field intensity caused by vehicle. After processing the algorithm, it is transmitted to the collection center through a special gateway and analyzed by traffic data management software, which can improve the traffic capacity of urban roads. Alleviating urban traffic congestion will play a role.
【学位授予单位】：中国科学院大学(中国科学院工程管理与信息技术学院)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U491.116

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