A vehicle detection method based on a low-power geomagnetic sensor

Abstract

The invention provides a vehicle detection method based on a low-power-consumption geomagnetic sensor. The method comprises the following steps that: a magnetic sensor outputs a group of magnetic-field components of an axis x, an axis y and an axis z during each measurement; a data judgment module including a baseline updating task sub-module, an entrance detection task sub-module and an exit detection task sub-module opens a segment of data window for each sub-module, solves the offset of each group of new measurement data firstly after the group of data is transmitted into the data judgement module, then judges the offsets, makes tags, transmits the tags to the data windows, performs statistics to obtain the number of the same type of tags in the data window, and obtains a judgment result in conjunction with a current working state; and a result output module outputs the judgement result. According to the algorithm, only few CPU resources need to be occupied in the running process; data can be acquired at certain time intervals and transmitted to the algorithm for calculation; and a system can be in a complete hibernation state at the rest of the time. The vehicle detection method is suitable for a low-cost geomagnetic vehicle detection system.

Description

technical field [0001] The invention relates to the technical field of parking detection in parking spaces, in particular to a vehicle detection method of a geomagnetic sensor with low power consumption. Background technique [0002] At present, the detection of traffic information in China is mainly carried out by using induction coil detectors. However, due to the low integrity rate of the coil and high maintenance costs, its installation and maintenance are not satisfactory, so it is hoped to find some other new vehicle information detection technologies. A geomagnetic sensor is a sensing device that can dynamically detect changes in the geomagnetic field. Because of its small size and not easy to damage, it has the characteristics of small footprint, easy installation, and high reliability when used, which can better make up for the shortage of coil detectors. [0003] Geomagnetism detects motor vehicles through the analysis of changes in the earth's magnetic field. Wh...

AI Technical Summary

Problems solved by technology

This method has a high detection success rate, but the amount of calculation is very large, and a large number of storage devices are required to save the images of various vehicles entering and exiting parking spaces. Therefore, it is necessary to use a mid-to-high-end MCU to run these algorithms, and the cost and operating costs are high. Many, and different drivers have different parking habits, it is easy to make matching mistakes

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