基于GPS车辆定位信息的交叉口延误计算方法

为得到车辆在城市道路信号控制交叉口的瞬时延误，根据车辆在交叉口的运行特征，利用GPS车辆定位信息，提出了交叉口车辆延误3种指标的计算方法。为确定加速度临界点，探讨了两种车辆延误的计算方法：加速度临界值过滤法和非线性拟合～局部最优解法。这两种方法能够很好地描述车辆加速和减速等运动过程，并有效地寻找交通流特征曲线的拐点，从而计算车辆在信号控制交叉口的延误。最后，通过实际数据对两种算法进行了验证。通过比较分析，从算法的简便性、有效性和准确性层面分别得出结论，结果表明，非线性拟合一局部最优解法比加速度临界值过滤法平稳，精度相对较高。

Vehicle Delay Models by Using Real-time GPS Data

In order to get the vehicle delays at the intersec- tion , we use real-time GPS data to analyze the immanent relations among basic parameters in traffic flow, and use acceleration to propose two new models to identify the on- set of velocity. With these new models, we derive some new arithmetic for detecting delay in road section and inter- section. Finally, we validate these two models with real world data, the solution shows that the part-prepreerence method is better than critical value method in stabili...