Traffic road condition estimation dynamic iteration method
A traffic condition and dynamic technology, applied in the field of intelligent transportation, can solve the problems of reducing time-varying accuracy and low accuracy of road network traffic conditions
Inactive Publication Date: 2015-10-28
信融源大数据科技(北京)有限公司 +1
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Problems solved by technology
This existing method belongs to the discrete static method, obliterates the actual speed difference between each road section on the space, uses the discrete time period on the time, has reduced the time-varying precision, also failed to accurately summarize each piece of data (vehicles) on the statistical calculation. OD) due to the spatio-temporal location points, therefore, the accuracy of estimating the road network traffic conditions using the average speed method is not high
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example 1
[0057] The advantage of the toll record data is mainly reflected in the fact that the toll record is a complete record of vehicles entering and leaving the road network. The content includes important information such as the vehicle license plate, model, time and station when the vehicle enters and leaves the road network. To put it simply, assuming that all vehicles are traveling at a constant speed in the road network, and all vehicles choose the shortest path from the start point to the end point, then the station and time when the vehicle enters and leaves the road network are known, and the speed of the vehicle and any time can be calculated. The position of the vehicle in the road network, that is, the road segment it is on. Further, the traffic and average speed of each road section can be counted. In this way, the road operation conditions can be reproduced from the toll data of vehicles entering and leaving the intersection.
[0058] image 3 It is a part of the roa...
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The invention discloses a traffic road condition estimation dynamic iteration method. According to the method, existing charging record data is utilized, the operation state of a road is reproduced through the dynamic iteration method including the step of calculating a shortest path of a vehicle driving in a road net aiming at each OD record; the driving state of the vehicle on each path section of the shortest path is inverted, and the flow and speed of each road section at each moment based on a uniform speed hypothesis are obtained; dynamic iteration inversion is carried out on all vehicle records; when a calculated variance f(x) is larger than or equal to a set variance threshold, the variance is adjusted by means of variance balancing, and dynamic iteration is carried out; and finally an inversion result is obtained. According to the invention, time is continuous, and by means of dynamic iteration, each tracing point in each time of iteration is adjusted in time and space, so that the rationality and the accuracy of the result of road operation state reproduction are ensured, and the road operation condition is monitored in real time.
Description
technical field [0001] The invention relates to the technical field of intelligent transportation, in particular to a dynamic iterative method for estimating the expressway state according to historical charging data. Background technique [0002] With the rapid development of our country's economy, the development of highway transportation technology and the improvement of management efficiency have become very important. Expressway traffic system is a typical complex system, and the complexity of the system is based on the road network structure. Effective and accurate measurement of traffic road conditions is the basis for improving the level of expressway operation management and service quality. [0003] The topology of the traffic network and the traffic parameters of the roads can reflect the performance of the traffic network to a certain extent. However, to evaluate the performance of the traffic network from a more comprehensive perspective, it is necessary to com...
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IPC IPC(8): G08G1/01
Inventor 谢昆青邢星星谢尘蒋红涛张继东谢昆良
Owner 信融源大数据科技(北京)有限公司