CN103500504A - Urban road traffic parameter estimation and road situation discrimination method based on RFID (Radio Frequency Identification) data and application system - Google Patents
Urban road traffic parameter estimation and road situation discrimination method based on RFID (Radio Frequency Identification) data and application system Download PDFInfo
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Abstract
The invention relates to an urban road traffic parameter estimation and road situation discrimination method based on RFID (Radio Frequency Identification) data and an application system and belongs to the technical field of intelligent transportation. The method comprises the steps of preprocessing the RFID data to realize identification of road network running vehicle tracks and obtain traffic parameters such as travel time, road section travel speed, road section flow and road network OD (Origin-Destination) through calculation; according to traffic parameter history data obtained through calculation, performing clustering analysis to traffic states, determining road situation discrimination thresholds and then discriminating the states according to real-time estimated traffic parameters. The urban road traffic parameter estimation and road situation discrimination method based on RFID data and the application system provided by the invention have the advantages that the traffic state discrimination accuracy is above 90 percent, the algorithm efficiency can meet the real-time demand of updating once per minute, the feasibility and the engineering applicability are better and a strong support can be provided for urban traffic state sensing.
Description
Technical field
The present invention relates to a kind of traffic parameter based on urban highway traffic real-time information collection data and estimate and the road conditions discrimination technology, belong to the intelligent transport technology field.
Background technology
In recent years, China introduces successively in a lot of cities the ITS technology and supports in traffic trip and management. along with on a large scale, comprehensive, traffic information collection infrastructure by all kinds of means complete, the means such as variable information plate, GPS navigation instrument, SMS, frequency modulation broadcasting of take are information terminal simultaneously, the Traveler Information service system offers traveler by real-time, accurate, personalized information, for its trip provides decision-making.On the other hand, the supvr can control and management urban transportation by Real-time Traffic Information.Visible, the development of intelligent transportation system, for traffic trip and management provide more decision information and selection.But still there are many deficiencies in existing traffic information collection with processing: the part traffic data has problems qualitatively at itself, the accuracy that causes extracting result is on the low side; Some disposal routes have defect on efficiency, can't the Real-time Obtaining journey time, the transport information such as road conditions; At present the System Construction deficient in stability of application with from maintenance characteristics, once the road base case changes, just can't obtain result accurately, life cycle is shorter.These problems, application and the service of differentiating to urban highway traffic parameter estimation and road conditions have brought numerous difficulties.
Through the prior art literature search is found, utilize urban highway traffic parameter estimation and the road conditions discrimination technology of radio frequency identification (Radio Frequency IDentification, RFID) data to have no open report.
Summary of the invention
The present invention is directed to thinking and the research of above problem, produced technical thought and implementation method that urban highway traffic parameter estimation based on the RFID data and road conditions are differentiated, larger promotion prospect is arranged.
The present invention is directed to the application of RFID technology under environment of internet of things, actual conditions in conjunction with the Chinese city road traffic, a kind of application method of new road Real-time Collection equipment has been proposed, with provide a kind of stable, reliable, accurately, urban highway traffic parameter estimation and the road conditions discrimination technology of efficiency.
For reaching above purpose, the present invention is achieved by the following technical solutions:
The method and technology scheme needed protection is characterized by: a kind of traffic parameter estimation and road conditions method of discrimination of obtaining data based on urban road RFID information of vehicles trackside collecting device, it is characterized in that, and comprise the steps:
(1) effectively rejected misdata and invalid data by the RFID data are carried out to pre-service, realized the identification of road network driving vehicle track, and then calculated as traffic parameters such as journey time, highway section travel speed, link flow, road network OD;
(2) according to the traffic parameter historical data calculated, the traffic parameter of remarkable sign road traffic features is analyzed, matching road traffic features model, calculate the road conditions discrimination threshold under different road traffic features;
(3) the road traffic features model obtained according to matching, judged traffic characteristic under the real-time traffic parameter of different roads, based on judged result, different roads called to different road conditions discrimination thresholds, obtains the most true and reliable road conditions result.
Based on said method; the application system technical scheme that the present invention needs protection is characterized by: it is characterized in that; whole application system comprises RFID data acquisition system (DAS) and core data disposal system, and the RFID data acquisition system (DAS) on described road network provides real-time basic data for described core data disposal system.
Described RFID data acquisition system (DAS) comprises RFID checkout equipment, RFID point bit data and road network GIS map, and the three provides respectively RFID real time data, RFID point position information data table, GIS spatial database.Described RFID checkout equipment, RFID point bit data, road network GIS map realize that its basic function has all belonged to prior art, therefore do not introduce in detail its structure, principle of work, should not be considered as disclosing insufficient.
Described core data disposal system mainly contains data reception module, pretreatment module, traffic parameter estimation module, highway section feature identification module, road conditions discrimination module, wherein:
(1) data reception module.The RFID real time data that RFID checkout equipment in the RFID data acquisition system (DAS) is collected sends on pretreatment module in real time, and can receive number, data receiver time, server health to data and carry out statistic record, the quality condition of monitor data in real time.
(2) pretreatment module.The RFID real time data of usining be the data of vehicle radio-frequency (RF) identification as input, carry out the data pre-service according to traffic flow theory, realize the identification of road network driving vehicle track, reflect the traffic of the whole driving of driving vehicle from the highway section starting point to terminal;
(3) traffic parameter estimation module.Thereby the driving vehicle track obtained according to pretreatment module calculates the traffic parameters such as Link Travel Time, travel speed and flow in real time, constructs the real-time data base based on oracle, result of calculation also can directly be presented in the GIS electronic chart simultaneously;
(4) highway section feature identification module.According to the historical travel speed data analysis in highway section feature, obtain road conditions speed of a motor vehicle interval, construct road conditions history feature analysis storehouse in conjunction with GIS spatial database and RFID point position information data table;
(5) road conditions discrimination module.The road conditions history feature built by highway section feature identification module is analyzed storehouse, the road network traffic characteristic is carried out to cluster analysis, delimit the road conditions discrimination threshold, then the traffic parameter calculated in real time according to the traffic parameter estimation module is differentiated the place state, transform out highway section condition discrimination result, that state is divided into is unimpeded, crowded, stop up Three Estate.
Further optimize above-mentioned application system technical scheme, the present invention can also increase design from maintenance module, be mainly manifested in the road conditions history feature is analyzed in the quality monitoring of the update mechanism in storehouse and real time data, the every weekly assembly operation of this module once, the real time data quality collected this week is estimated, then this collection of real time data and history feature storehouse are carried out to the parameter fusion, in conjunction with quality of data evaluation result, the history feature storehouse is adjusted, to guarantee that the history feature storehouse can adapt to current road network situation all the time.
Through checking on the spot, the traffic state judging precision reaches more than 90%, and efficiency of algorithm can meet one minute real-time demand of upgrading once.And, in traditional road conditions discrimination technology, even the highest road conditions method of discrimination based on GPS data from taxi of precision, it differentiates result also can only reach 85% left and right, and the algorithm computing is consuming time longer, often can only meet the real-time demand of upgrading once in 5 minutes.As can be seen here, the urban highway traffic parameter estimation based on the RFID data and road conditions method of discrimination and application system have higher technical feasibility and engineering practicability, can provide powerful support for for the urban traffic status perception provides.With the technology of based on floating car data, with the inductive coil data, carrying out the traffic differentiation commonly used, compare, this technology can be crossed the track of vehicle is identified, and overcome a large amount of tracks of vehicle from algorithm and identify ubiquitous efficiency, in the reliability and the practicality that improve when differentiating accuracy as a result the system that guaranteed.
The accompanying drawing explanation
The urban highway traffic parameter estimation techniques of Fig. 1 based on the RFID data and the comparison of conventional art;
The road conditions discrimination technology of Fig. 2 based on the RFID data and the comparison of conventional art;
Urban highway traffic parameter estimation and the road conditions judgement system logical design of Fig. 3 based on the RFID data;
Urban highway traffic parameter estimation and the road conditions judgement system structural design of Fig. 4 based on the RFID data.
Embodiment
Differentiate three parts from utilization, data pre-service and the dynamic road condition of basic data and carry out the theory and practice innovation in the use to the urban road traffic information image data, and developed reliable and stable real time processing system.
This system is based on the C/S framework, comprises altogether backstage calculation server and interface server.The backstage calculation server is responsible for the data of input are carried out to real-time processing and analysis, in conjunction with GIS spatial database and RFID point position information data table, builds road conditions history feature analysis storehouse, with this, real-time traffic parameter is converted into to road conditions and differentiates result; Interface server by with road network on the data-interface of RFID checkout equipment the testing result of each detecting device is written in the database of calculation server in real time.
Real-time access and the calculating of data has been considered in this invention, can realize the real time data per minute is carried out to once-through operation, comprises that track of vehicle identification, bicycle journey time are extracted, the road-section average travel speed is estimated, four parts of road section traffic volume condition discrimination.Real-time data base and historical data base based on oracle have been built, sequential operation efficiency is higher: with RFID data (more than 4000 of per minute data volume) (CPU:Intel Core i5 3230M on the family expenses notebook in whole Nanjing, internal memory 8G, hard disk 5400rpm SATA HDD) move about average 5s consuming time.Illustrate that the counting yield of this invention can be good at meeting the data computation requirement in a city, not high to the computer hardware conditional request.
Claims (3)
1. obtain the traffic parameter estimation and road conditions method of discrimination of data based on urban road RFID information of vehicles trackside collecting device, it is characterized in that:
(1) effectively rejected misdata and invalid data by the RFID data are carried out to pre-service, realized the identification of road network driving vehicle track, and then calculated as journey time, highway section travel speed, link flow, road network OD traffic parameter;
(2) according to the traffic parameter historical data calculated, the traffic parameter of remarkable sign road traffic features is analyzed, matching road traffic features model, calculate the road conditions discrimination threshold under different road traffic features;
(3) the road traffic features model obtained according to matching, judged traffic characteristic under the real-time traffic parameter of different roads, based on judged result, different roads called to different road conditions discrimination thresholds, obtains the most true and reliable road conditions result.
2. the urban highway traffic parameter estimation based on the RFID data and road conditions are differentiated application system, it is characterized in that, whole application system comprises RFID data acquisition system (DAS) and core data disposal system, described online RFID data acquisition system (DAS) provides real-time basic data for described core data disposal system
Described RFID data acquisition system (DAS) comprises RFID checkout equipment, RFID point bit data and road network GIS map, and the three provides respectively RFID real time data, RFID point position information data table, GIS spatial database;
Described core data disposal system mainly contains data reception module, pretreatment module, traffic parameter estimation module, highway section feature identification module and road conditions discrimination module, wherein:
Data reception module can send to the RFID real time data of RFID data acquisition system (DAS) on pretreatment module in real time, and can receive number, data receiver time, server health to data and carry out statistic record, in real time the quality condition of monitor data; It is that the data of vehicle radio-frequency (RF) identification are as input that pretreatment module is usingd the RFID real time data, carry out the data pre-service according to traffic flow theory, realize the identification of road network driving vehicle track, reflect the traffic of the whole driving of driving vehicle from the highway section starting point to terminal;
The traffic parameter estimation module, thereby the driving vehicle track obtained according to pretreatment module calculates the traffic parameters such as Link Travel Time, travel speed and flow in real time, construct the real-time data base based on oracle, result of calculation directly is presented in the GIS electronic chart simultaneously;
Highway section feature identification module, according to the historical travel speed data analysis in highway section feature, obtain road conditions speed of a motor vehicle interval, in conjunction with GIS spatial database and RFID point position information data table, constructs road conditions history feature analysis storehouse;
The road conditions discrimination module, the road conditions history feature built by highway section feature identification module is analyzed storehouse, the road network traffic characteristic is carried out to cluster analysis, delimit the road conditions discrimination threshold, then the traffic parameter calculated in real time according to the traffic parameter estimation module is differentiated the place state, transform out highway section condition discrimination result, that state is divided into is unimpeded, crowded, stop up Three Estate.
3. urban highway traffic parameter estimation and the road conditions judgement system based on the RFID data as claimed in claim 2, it is characterized in that, increase design from maintenance module, show the road conditions history feature is analyzed in the quality monitoring of the update mechanism in storehouse and real time data, the every weekly assembly operation of this module once, the real time data quality collected this week is estimated, then this collection of real time data and history feature storehouse are carried out to the parameter fusion, in conjunction with quality of data evaluation result, the history feature storehouse is adjusted, to guarantee that the history feature storehouse can adapt to current road network situation all the time.
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| CN103871239A (en) * | 2014-03-17 | 2014-06-18 | 同济大学 | Taxi and bus GPS (global position system) data-based bus running state discriminating method and application system |
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