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研究了一种基于Lissajous图形的光纤分布式扰动传感器定位方法。光纤分布式扰动传感器基于Mach-Zehnder干涉仪,通过两路输出信号的时延得到扰动定位。在两路输出信号的Lissajous图形中构造拟合椭圆,基于实验数据的仿真研究表明:通过椭圆半短轴长可以得到时延,实现定位。对该方法进行了仿真和实验研究,在无需噪声抑制的条件下定位精度较高:在信噪比为-6~7 dB范围,最大定位误差为207 m;多次测量中,最大误差为94 m。研究结论可以为光纤分布式扰动传感器定位方法提供新的技术参考。 相似文献
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To effectively solve the traffic data problems such as data invalidation in the process of the acquisition of road traffic states, a road traffic states estimation algorithm based on matching of the regional traffic attracters was proposed in this work. First of all, the road traffic running states were divided into several different modes. The concept of the regional traffic attracters of the target link was put forward for effective matching. Then, the reference sequences of characteristics of traffic running states with the contents of the target link's traffic running states and regional traffic attracters under different modes were established. In addition, the current and historical regional traffic attracters of the target link were matched through certain matching rules, and the historical traffic running states of the target link corresponding to the optimal matching were selected as the initial recovery data, which were processed with Kalman filter to obtain the final recovery data. Finally, some typical expressways in Beijing were adopted for the verification of this road traffic states estimation algorithm. The results prove that this traffic states estimation approach based on matching of the regional traffic attracters is feasible and can achieve a high accuracy. 相似文献
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详细分析了传感器布局(SLP)的多种影响因素并给出相应的数学表达,在最大综合价值模型(MIVM)的基础上,给出了MIVM简化模型及其算法,并用于研究各因素对SLP问题的影响模式.数值实例结果表明,本简化模型能揭示SLP与影响因素之间的内在作用方式,能直观分析各因素对最优SLP问题的影响模式.通过各因素变化时最优SLP二维离散点的分布和运动趋势,揭示了各因素对最大综合价值和最优传感器个数的影响机理,从而当某影响因素变化时能给出相应的策略,使SLP时刻保持或趋向于最优状态. 相似文献
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A pre-selection space time model was proposed to estimate the traffic condition at poor-data-detector, especially non-detector
locations. The space time model is better to integrate the spatial and temporal information comprehensibly. Firstly, the influencing
factors of the “cause nodes” were studied, and then the pre-selection “cause nodes” procedure which utilizes the Pearson correlation
coefficient to evaluate the relevancy of the traffic data was introduced. Finally, only the most relevant data were collected
to compose the space time model. The experimental results with the actual data demonstrate that the model performs better
than other three models. 相似文献
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多模态的交通流量预测模型 总被引:2,自引:1,他引:1
针对交通状态的多模态性,提出了多模态的交通流量预测方法.引用道路服务水平将交通状态分为6级(类)模态,并研究了不同模态与流量之间的对应关系.多模态的交通流量预测模型根据历史数据判断交通模态的改变情况,在整合自回归移动平均模型(ARIMA)预测的基础上,利用模态修正函数动态调整ARIMA预测中产生的时滞误差.以实际交通流... 相似文献
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在分析道路交通信息空间分布特性的基础上,定义了一个描述交通信息空间关系特性的信息度函数.并利用北京二环路上的交通数据进行相关性分析,绘制散点分布图,给出信息度函数的数学表达式.基于标定的信息度函数可获得路段交通信息的空间分布,并为交通检测器布局优化及其组网优化研究提供参考. 相似文献