Speed measuring method for vehicles on expressway

Abstract

The invention discloses a speed measuring method for vehicles on an expressway and belongs to the field of mobile communication. The speed measuring method includes the steps of recognizing users of the expressway through signaling at an A intersection of a global system for mobile communication (GSM) network covering the expressway, building a changing-over strip of the expressway according to call records of the users of the expressway, and carrying out speed measurement according to the position of the changing-over strip of the expressway and the changing-over time of the users of the expressway. Through real-time data acquisition and processing, the speed measuring method improves real-time processing capacity and accuracy. Moreover, due to the fact that the speed measuring method carries out analysis based on signaling of signals of mobile phones, the speed measuring method does not need novel equipment. Just people using the mobile phones all can carry out locating, so investment of the equipment is reduced. The mobile phones of the users just can maintain a starting state, and then the speed measuring method can carry out speed measurement through the signaling at the A intersection. Calculation of speed measurement process is carried out through a system according to the signaling at the A intersection, but not through mobile phone terminals of the users. Therefore, the speed measuring method for the vehicles on the expressway has measuring stability.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method for measuring speed of a high-speed road vehicle. Background technique [0002] With the rapid development of expressway construction and the recent implementation of freeway festivals, the number of vehicles on the expressway is increasing, which directly leads to the increasing difficulty of speed detection for expressway users. The current limited manpower alone cannot meet the regulatory requirements. , there is an urgent need for efficient automated monitoring methods. [0003] The existing vehicle speed measurement technology means are mainly as follows: [0004] 1. Coil-type speed measurement: There are two sets of induction coils buried under the road surface. When a vehicle passes by, the user divides the distance between the two sets of coils by the detection time difference to obtain the vehicle speed. [0005] 2. Radar speed measurement (microwave speed ...

AI Technical Summary

Problems solved by technology

[0008] 1. Equipment and investment: It needs to be equipped with special GPS terminal, transmission network and monitoring platform and other equipment. The battery life is short, and the continuous use without plugging in the power supply is generally only 40 minutes to 1.5 hours; the positioning is not accurate, and the GPS normal plane positioning error Within 10-30 meters; greatly affected by weather and other factors, resulting in star search not being possible or very slow

Moreover, the expressway lines are long, and if full coverage is achieved, the investment in equipment required is huge

[0009] 2. In terms of accuracy: In order for the radar to function normally, it must be on the same path as the vehicle under test. If the radar is placed at a certain angle from the vehicle’s driving path, so that it cannot always be kept parallel to the vehicle’s path, the radar detected The measured speed will be slower than the actual speed, and the measured speed is the projection of the actual speed of the vehicle in the X direction; radar speed measurement is easily limited by the physical environment, and some larger objects on the road, such as buildings, advertising boards, etc. , will affect the accuracy of radar speed measurement; the measurement method based on sampling, due to the limitation of the number of samples, it is difficult to improve the accuracy; there is a shadow effect, when using the patrol method to measure, if the patrol car is very close to the target car, The microwave reflection intensity of the target vehicle traveling in the same direction will replace the microwave reflected by the ground, making it difficult for the radar to accurately identify the patrol vehicle speed. At this time, the patrol vehicle speed may be lost, resulting in measurement errors

[0010] 3. In terms of real-time performance: the speed measurement results of the existing speed measurement methods are notified to the car owner after speeding through the form of a ticket, so that the car owner can only know after the fact. to good effect

[0011] 4. In terms of stability: Although the video-based vehicle speed measurement system can effectively identify and track vehicles in most cases, when there are many vehicles on the road or there is traffic congestion, the vehicle targets in the foreground image will stick to a large area Together, it increases the difficulty of monitoring; at the same time, the actual situation on the road is complicated, such as strong winds causing mechanical vibration of the camera, and lightning causing drastic changes in light, etc. There are many unpredictable situations that may cause the system to fail to work stably within a certain period of time

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