Intersection vehicle trajectory reconstruction method based on fixed-point detection and electric police data fusion

A vehicle trajectory and data fusion technology, applied in the field of traffic information, can solve the problems of limited penetration rate of floating vehicles and low sampling frequency

Active Publication Date: 2018-09-04
连云港杰瑞电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, my country's traffic informatization has developed rapidly, and the urban road data environment has become more and more perfect; bu

Method used

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  • Intersection vehicle trajectory reconstruction method based on fixed-point detection and electric police data fusion
  • Intersection vehicle trajectory reconstruction method based on fixed-point detection and electric police data fusion
  • Intersection vehicle trajectory reconstruction method based on fixed-point detection and electric police data fusion

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Experimental program
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Embodiment 1

[0103] Embodiment 1, a method for reconstructing vehicle trajectory at an intersection based on the fusion of fixed-point detector data and electric police data,

[0104] (1) long queue recognition;

[0105] (2) Flow mapping of upstream and downstream lanes based on BP neural network;

[0106] (3) Reconstruction of vehicle trajectories at intersections.

[0107] Further refinement is as follows:

[0108] 1. Long queue recognition

[0109] When the queue length is close to the detector, the detector occupancy rate increases and the number of passing vehicles decreases. The invention starts from the change characteristics of the flow rate and occupancy rate, and identifies the long queue based on the fixed-point detection data of the road section.

[0110] The occupancy rate can be expressed as: within a certain time interval T, the ratio of the time t and T that the detector is occupied, that is:

[0111]

[0112] o cc — the time occupancy of the detector

[0113] T—d...

Embodiment 2

[0197] Embodiment 2: experiment

[0198] Taking the intersection of Fuzhou South Road-Hong Kong Middle Road in Qingdao as an example, the research object is the north entrance. The length of the road section is 210m, and the detectors in the road are arranged at a position about 140m away from the intersection stop line. The electric police equipment is deployed 30m upstream from the stop line at the intersection.

[0199] The morning peak of 7:00 to 9:00 on November 28, 2016 was selected as the research period. The collected data includes microwave detector data, electric alarm data, signal timing data and video data of corresponding time periods. The microwave detector data is the flow rate, speed, and occupancy rate collected in 60s. The format is .xlsx. There are 7,200 pieces in total, and 120 pieces are extracted as verification data; the electric police data is the time when the vehicle passes the stop line, lane ID, vehicle ID, and flow direction ID, etc., in the for...

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Abstract

The invention provides an intersection vehicle trajectory reconstruction method based on data fusion from the electric police and a fixed-point detector. The method comprises: long queuing identification is carried out, wherein the long queuing means that the queuing length exceeds the detector position; upstream-downstream lane flow mapping is carried out; and intersection vehicle trajectory reconstruction is carried out based on a traffic wave theory. When the queuing length is close to the detector, the detector occupancy rate increases and the passing vehicle number is reduced; and the long queue is identified based on fixed-point detection data of the section based on changing characteristics of the flow and occupation rate. According to the invention, the intersection vehicle trajectory reconstruction method has the following beneficial effects: the method is based on detection conditions of most of cities in the country and the 60s-aggregate flowing density and speed data and detection frequency are provided, so that the dependence on the high-frequency floating car trajectory data is eliminated.

Description

technical field [0001] The invention belongs to the field of traffic information, and in particular relates to a vehicle track reconstruction method at an intersection based on data fusion of electric police and fixed-point detectors. Background technique [0002] Vehicle trajectories are the most comprehensive and complete expression of traffic flow operation status, and contain rich traffic flow information. The vehicle trajectory at the intersection refers to the complete physical trajectory of the vehicle in the process of driving at the intersection, which can reflect the characteristics of vehicle speed and acceleration with time and space. Reconstructing vehicle trajectories near intersections can comprehensively and accurately reproduce the running rules of vehicles passing through intersections, thereby improving the accuracy of estimation and prediction of traffic state parameters (such as travel speed, travel time, queue length, delay, etc.) and traffic signals c...

Claims

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Application Information

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IPC IPC(8): G08G1/01
CPCG08G1/0116G08G1/0125
Inventor 项俊平唐克双曾晓强王龙飞张新军
Owner 连云港杰瑞电子有限公司
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