Method and device for speed measurement based on geomagnetic sensing

Abstract

The invention discloses a method and a device for speed measurement based on geomagnetic sensing. The method comprises the following steps of: arranging multiple groups of geomagnetic sensor nodes on a same lane of a road, each group comprising two geomagnetic sensors with a fixed distance and in the same direction; detecting, by the geomagnetic sensors, a passing situation of vehicles by using a fixed threshold value method: setting a fixed geomagnetic strength as a threshold value, and determining the arrival of a vehicle when detecting that the magnetic field strength is changed and continuously exceeds the threshold value; determining the departure of the vehicle when the magnetic field strength is changed and is continuously smaller than the threshold value; and according to the distance between two geomagnetic sensors in each group of the geomagnetic sensor nodes, and the times of the arrival and departure of the vehicle, calculating the driving speed of the vehicle in this period of time, wherein the average value of the driving speeds of the vehicle, calculated by the multiple groups of geomagnetic sensor nodes, is a finally measured driving speed of the vehicle. By use of the method and the device disclosed by the invention, overspeed phenomena on a common road or an expressway can be effectively detected and corrected in time, so that the method and the device have the characteristics of strong function, low price, convenience, flexibility and the like.

Description

technical field [0001] The invention relates to the technical field of vehicle speed measurement, in particular to a speed measurement method and device based on geomagnetic sensing. Background technique [0002] In recent decades, due to the rapid development of the automobile industry, the number of automobiles has increased sharply, the traffic flow has increased, the ratio between the growth rate of vehicles and the development speed of road construction has been seriously out of balance, and traffic management has caused frequent traffic accidents. a major public hazard. The economic loss caused by road traffic accidents in many countries is about 1% of their national economic output. Therefore, people call road traffic accidents "disease of modern civilization" and "endless war". [0003] There are many reasons for road traffic accidents, mainly including driver factors, pedestrian factors, road factors and management factors, among which speeding is one of the most ...

AI Technical Summary

Problems solved by technology

These speed measurement technologies are relatively mature and have been widely used, but there are still many problems, such as radar speed measurement needs to be manned, laser speed measurement is expensive, coil speed measurement is difficult to carry, and video speed measurement is easy to be detected by drivers, etc.

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