Method for estimating traffic state parameter based on confidence of speed of float car

A traffic state and parameter estimation technology, which is applied in the direction of traffic flow detection, etc., can solve the problems of traffic state parameter estimation, which cannot fully reflect the road traffic state, and the traffic state cannot be started.

CN102087788BActive Publication Date: 2012-12-19上海济安交通工程咨询有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-12-19

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Abstract

The invention provides a method for estimating a traffic state parameter (speed) based on confidence optimization by analyzing data characteristic of the float car, introducing a confidence factor and mainly considering float car data sample number, the speed and time continuity of a traffic state. The average speed of the float car is estimated by confiding most of vehicles and high-speed vehicles and combining speed data of a previous time interval and historical speed data. The influence of abnormal data on a calculation result is effectively reduced, so that the calculation result is closer to an actual road situation; meanwhile, the problem of traffic state parameter estimation under the condition of sample size deficiency is solved, so that the accuracy and the stability of the traffic state parameter estimation are greatly improved.
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Description

technical field

[0001] The present invention relates to the technical field of intelligent transportation, in particular to the technical field of floating car information collection, and more specifically, to a method for estimating traffic state parameters based on the confidence degree of the speed of the floating car. Background technique

[0002] Float car, also known as "probe car", is one of the advanced technical means used in the international intelligent transportation system (ITS) to obtain road traffic information in recent years. Its basic principle is: according to the vehicle position, direction and speed information regularly recorded by the floating vehicle equipped with the vehicle-mounted global positioning system during its driving process, apply map matching, path estimation and other related calculation models and algorithms to process, so that the position of the floating vehicle The data is associated with urban roads in time and space, and finally tr...

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Embodiment Construction

[0033] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0034] The core idea of ​​the present invention is to provide a method for estimating traffic state parameters (vehicle speed) based on confidence optimization. By introducing confidence factors, it focuses on the number of floating car speed data samples, the speed of the vehicle, and the continuity of traffic state in time. To overcome the problem that the existing estimation methods of traffic state parameters cannot fully reflect the real traffic state parameters.

[0035] When judging the traffic status of urban roads, usually all the roads in the city are divided into multiple road sections, and the traffic status of each road section is judged separately, and the traffic status of all road sections is summarized to obtain the entire urban ...