移频键控多值传送扩频（FSK—SS）通信方式

与通常的直接序列扩频通信方式（ＤＳ－ＳＳ）相比，移频键控多值传送扩频通信方式（ＦＳＫ－ＳＳ）具有２传输效率高的特点。理论分析与计算机模拟结果表明，在设定的范围内，ＦＳＫ－ＳＳ在与ＤＳ－ＳＳ方式相同的信噪比与误码率条件下，其传输效率可提高近３倍。     

数字相敏检测的一种最大后验概率方法

本文基于最大后验概率估值原理，提出一种新的相敬检测方法。文中给出了判决量的计算公式和所提出方法的数字信号处理器实现结构。计算机模拟结果表明，所提出的方法较Ｓａｍｉｊｅ所提出的正交采样数字相敏方法有更好的检测性能。     

全自动运行信号系统设计的工程优化方案研究

城市轨道交通全自动运行系统(FAO)根据自动化等级分为GoA3有人职守的全自动运行和GoA4无人职守的全自动运行。针对全自动运行系统"中心强化管控、故障快速恢复"的功能需求特点,阐述全自动运行的核心专业——信号系统,从GoA2级向GoA4级过渡中在系统架构和功能上优化设计方案的重要性。以中心直接管控列车为出发点,重点从中央集中管控、设备安全可靠、故障快速恢复等方面,提出了采用双活中心、全电子联锁、集雷达与视频分析技术于一体的智能探测设备的优化建议,为提高全自动运行系统的可靠性、稳定性提供参考。     

基于可见光通信和接收信号强度检测的列车定位方法研究

精确的列车位置信息是CBTC(基于通信的列车控制)系统保障列车安全高效运行的关键因素。针对地铁独特的隧道环境和列车运营特点,提出一种VLC(可见光通信)和RSSI(接收信号强度检测)相结合的列车定位方法。首先,以朗伯光源模型为基础,构建LED可见光通信的CBTC系统的列车定位模型;其次,利用RSSI值计算隧道壁上LED灯与列车之间的直线距离,并使用三边定位原理和最小二乘法拟合列车定位结果;然后,引入VLC与RSSI相结合的列车定位观测模型和误差模型,对运行中的列车实时定位与误差分析;最后,以成都地铁1号线的真实线路数据和设备参数为依据,验证所提方法的可行性和有效性。研究结果表明:该列车定位方法的最大定位误差为39.23cm,平均定位误差为13.36cm,满足CBTC系统对高精度列车定位的要求,可以作为传统列车定位方法的一种全新选择。     

力平衡半球谐振陀螺的信号检测

根据半球谐振陀螺的动力学方程和闭环反馈理论,推导出离散激励器和信号检测器在壳体环向的角度配置;研究了在力平衡模式下半球谐振陀螺的信号闭环检测方法.当陀螺壳体绕中心轴旋转时,由于哥氏效应,谐振子振型相对壳体产生进动,通过控制双点激励力的幅值比,实现振型对壳体转动角度的跟踪,从而完成半球谐振陀螺在力平衡模式下的信号检测.     

Multi-objective signal control of urban junctions – Framework and a London case study

This paper presents an approach to multi-objective signal control using fuzzy logic. The signal control uses fuzzy logic where the membership functions are optimised according to the Bellman–Zadeh principle of fuzzy decision-making. This approach is both practical for the decision-maker and efficient, as it leads directly to a Pareto-optimal solution. Signal control priorities are ultimately a political decision. Therefore the tool developed in this research allows the traffic engineer to balance the objectives easily by setting acceptability and unacceptability thresholds for each objective. Particular attention is given in the example to pedestrian delays. The membership functions of the fuzzy logic are optimised by a genetic algorithm coupled to the VISSIM microscopic traffic simulator. The concept is illustrated with a case study of the Marylebone Road–Baker Street intersection in London at which pedestrians as well as vehicle flows are high. The results prove the feasibility of the framework and show the vehicle delays for a more pedestrian friendly signal control strategy.     

Potential benefits of an adaptive forward collision warning system

Forward collision warning (FCW) systems can reduce rear-end vehicle collisions. However, if the presentation of warnings is perceived as mistimed, trust in the system is diminished and drivers become less likely to respond appropriately. In this driving simulator investigation, 45 drivers experienced two FCW systems: a non-adaptive and an adaptive FCW that adjusted the timing of its alarms according to each individual driver’s reaction time. Whilst all drivers benefited in terms of improved safety from both FCW systems, non-aggressive drivers (low sensation seeking, long followers) did not display a preference to the adaptive FCW over its non-adaptive equivalent. Furthermore, there was little evidence to suggest that the non-aggressive drivers’ performance differed with either system. Benefits of the adaptive system were demonstrated for aggressive drivers (high sensation seeking, short followers). Even though both systems reduced their likelihood of a crash to a similar extent, the aggressive drivers rated each FCW more poorly than their non-aggressive contemporaries. However, this group, with their greater risk of involvement in rear-end collisions, reported a preference for the adaptive system as they found it less irritating and stress-inducing. Achieving greater acceptance and hence likely use of a real system is fundamental to good quality FCW design.     

单个交叉口模糊控制及Simulink仿真

以车辆排队长度为控制量,提出了一种交叉口模糊控制方法,并以四相位交叉口为例,建立了Simulink仿真模型,在不同交通流数据下将此模糊控制与现有的定时控制比较,对其控制效果进行仿真验证。仿真结果从车辆平均延误、信号周期和车辆的最大排队长度等方面,显示出了模糊控制的优越性。     

小波变换用于输油管道漏磁检测信号处理

采用漏磁法对输油管道进行无损检测时,采集的漏磁信号具有数据量大和附带大量噪声的特性.为了去除信号中夹杂的噪声,采用小波变换中的Mallat算法对漏磁信号进行处理,使信号便于储存和分析.通过信号处理实验,取得了良好的效果.     

基于仿真的交通信号控制优化策略研究

根据道路流量,研究了利用灵活的控制策略提高交通控制的效率问题.针对信号控制交叉口实际流量动态变化的特征,在现有传统控制方法的基础上根据交叉口交通流的变化特点,提出采用可变车道控制模式的控制方法、单边轮放控制模式的控制方法,介绍了其潜在的适用条件、优势及特点,并在交通流量调查的的基础上,建立了交叉口的相应仿真模型,利用信号控制仿真软件Synchro验证了在高峰期不同控制方法的效果.仿真结果表明,所提出的控制方法适用于具有相应流量特点的交叉口,提高了信号交叉口的控制效率.