论文标题
探测器数据和样本量需求的流速估算
Flow Rate Estimation From Probe Vehicle Data And Sample Size Requirements
论文作者
论文摘要
使用探测车进行交通监控的兴趣正在增长。本文的重点是从探测器数据数据和样本量需求的评估中估算流量。根据有关探针p百分比和流速λ的可用信息，考虑了三种情况，而流速λ：i）p是已知的，但未知ii）λ是已知的，但p尚不清楚，iii）这两个参数尚不清楚。所有三种情况的估计方法以及这些估计的可靠性均呈现。在前两种情况下，计数数据提供了足够的信息，以估计未知参数P和λ时，当另一个参数已知时。在这两种情况下，得出简单的分析表达式以分析准确性和样本量要求。但是，当两个参数尚不清楚时，则需要超出计数数据的其他信息。在这种情况下，探针车辆在队列中的位置用作其他信息。结果表明，需要收集多长时间的数据以在可接受的置信度水平下估计参数。
The interest to use probe vehicles for traffic monitoring is growing. This paper is focused on the estimation of flow rate from probe vehicle data and the evaluation of sample size requirements. Three cases are considered depending on the available information on the percentage of probes p and the flow rate λ: i) p is known but λis unknown ii) λis known but p is unknown, and iii) both parameters are not known. Estimation methods for all three cases are presented along with the reliability of these estimates. For the first two cases, count data provide sufficient information to estimate the unknown parameters p and λindividually when the other one is known. For these two cases, simple analytical expressions are derived to analyze the accuracy and sample size requirements. However, when both parameters are unknown then additional information beyond count data is required. The position of probe vehicles in a queue at signalized intersections is used as additional information in that case. The results show for how long data need to be collected to estimate the parameters at acceptable confidence levels.
