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A Real-time Estimation Method of Expressway Traffic Parameters Based on Distributed Optical Fiber

A distributed optical fiber and expressway technology, applied in the field of intelligent transportation, can solve the problems of microwave and ultrasonic sensors affected by bad weather, susceptible to rain, snow and heavy fog, and high maintenance costs, so as to improve the utilization of road resources and realize real-time online Estimate and overcome the effects of inaccurate estimates

Active Publication Date: 2020-06-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Contact detection equipment has high detection accuracy, but it needs to damage the road surface and block traffic during maintenance, and the maintenance cost is high, so it is not suitable for expressways; microwave and ultrasonic sensors are easily affected by bad weather, and the video camera detection method collects a large amount of data. It has relatively high requirements for storage and processing, and is also vulnerable to bad weather such as rain, snow and fog

Method used

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  • A Real-time Estimation Method of Expressway Traffic Parameters Based on Distributed Optical Fiber
  • A Real-time Estimation Method of Expressway Traffic Parameters Based on Distributed Optical Fiber
  • A Real-time Estimation Method of Expressway Traffic Parameters Based on Distributed Optical Fiber

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Embodiment 1

[0071] The signal acquisition and accumulation process of the distributed optical fiber acoustic wave / vibration sensing system of expressway, as shown in the attached Figure 1-3 Shown: With the triggering of the light pulse cycle, the horizontal space signal collected in each light pulse trigger cycle (signal space collection length is N) is vertically accumulated along the time axis, and M original signal traces collected are continuously accumulated to construct A space-time signal matrix with M dimension in time and N dimension in space is obtained, that is, the space-time response signal of vehicles traveling on the whole expressway section:

[0072] {XX=x ij (i=1,2,...,M; j=1,2,...,N)} (1)

[0073] Among them, M is the time sampling length, N is the space sampling length, and the units are sampling points.

[0074] The distributed optical fiber acoustic wave / vibration sensing system collects the time-space response signals of vehicles traveling on the entire road. By d...

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Abstract

The present invention discloses a real-time estimation method of expressway traffic parameters based on distributed optical fiber. The purpose of the present invention is to provide a real-time estimation method of expressway traffic parameters based on distributed optical fiber, which can monitor the traffic operation status of the entire section of expressway online in real time , and real-time estimation of the key traffic parameters of vehicle operation in each section of the whole process, providing real-time and reliable vehicle driving and road condition information for the entire expressway for the traffic management department, providing a way for intelligent regulation, timely relief of congestion, and effective improvement of road resource utilization Important technical means; this application is applicable to the fields related to intelligent transportation.

Description

technical field [0001] The invention belongs to the field of intelligent transportation, and in particular relates to a whole-process on-line monitoring of expressway operating conditions and a method for real-time estimation of traffic parameters based on distributed optical fiber acoustic wave / vibration sensing. Background technique [0002] In recent years, my country's expressway has developed rapidly and has become the main force of road transportation. By the end of 2016, the mileage of expressways in China had reached 130,000 kilometers, ranking first in the world. The expressway is fully closed management, which reduces the interference of traffic, eliminates the cross conflict of traffic flow, and creates good conditions for the passage of motor vehicles. However, traffic accidents frequently occur due to drivers' poor awareness of laws and regulations, weak safety awareness, and insufficient driving experience, which seriously affect the traffic capacity of expres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08G1/01G08G1/015G08G1/04G08G1/052G08G1/065
Inventor 吴慧娟何佳朋陈吉平饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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