The invention discloses an expressway traffic flow parameter acquisition method. The method comprises the following steps: dividing an expressway into unit grids with uniform sizes; performing coordinate calibration on the expressway lane lines according to a preset interval; determining a unit grid where the vehicle is located according to the lane line coordinates and the vehicle coordinates, constructing a vehicle trajectory according to the vehicle coordinates, and estimating initial traffic flow parameters of the unit grid according to the vehicle trajectory and the unit grid where the vehicle is located; for the unit grid provided with the fixed detection equipment, section traffic flow data is obtained through the fixed detection equipment, the Beidou GPS vehicle track permeability is calculated according to the section traffic flow data, and initial traffic flow parameters of the unit grid are corrected according to the Beidou GPS vehicle track permeability; for the unit grids without fixed detection equipment, the initial traffic flow parameters of the unit grids are corrected through the unit grids which are adjacent to the unit grids and have corrected initial traffic flow parameters, the requirement for the fixed detection equipment is not high, the operation and maintenance cost is very low, and through combination with the Beidou GPS vehicle track, the traffic flow parameters of the unit grids are corrected. And high-precision highway large-range traffic flow parameter data can be obtained.
本发明公开了一种高速公路交通流参数获取方法,包括:将高速公路划分为大小均匀的单元网格;按照预设的间隔对高速公路车道线进行坐标标定;根据车道线坐标和车辆坐标确定车辆所处单元网格,根据车辆坐标构建车辆轨迹,根据车辆轨迹和车辆所处单元网格估算单元网格初步交通流参数;对于设有固定检测设备的单元网格,通过固定检测设备获取断面交通流数据,据此计算北斗GPS车辆轨迹渗透率,并根据北斗GPS车辆轨迹渗透率对单元网格初步交通流参数进行修正;对于未设有固定检测设备的单元网格,通过和其相邻且已修正过初步交通流参数的单元网格对单元网格初步交通流参数进行修正,本发明对于固定检测设备的要求不高,运营和维护成本很低,通过与北斗GPS车辆轨迹的结合,可以获取较高精度的高速公路大范围交通流参数数据。
Expressway traffic flow parameter acquisition method and system
高速公路交通流参数获取方法及系统
2023-03-14
Patent
Elektronische Ressource
Chinesisch
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