A parking space detection method based on geomagnetic sensor

Abstract

The invention provides a parking space detection method based on a geomagnetic sensor. The method includes the steps that geomagnetism disturbance signals are acquired, smoothing and / or filtering are / is conducted on the acquired signal data, a state model is built according to the geomagnetism disturbance signals to generate a state analysis graph, and behavior feature analysis is conducted according to the state analysis graph to judge vehicle behavior states; according to the vehicle behavior states, use states of parking spaces are judged, geomagnetic signals of a parking space area static background and the geomagnetism disturbance signals caused by target detection vehicles are acquired in real time through the geomagnetic sensor, data which are useless, invalid and capable of influencing accurate analysis of the disturbance signals are classified and eliminated, and data which are precise and can effectively reflect disturbance signal changes are left and used for subsequent building of the state model. The behavior state model can accurately reflect vehicle running states, use conditions of the parking spaces can be deduced according to the vehicle running states, the design principle is reasonable, detection precision is high, detection speed is high, and parking space detection can be well conducted.

Description

[technical field] [0001] The invention relates to the technical field of parking space detection, in particular to a geomagnetic sensor-based parking space detection method with high detection accuracy, fast detection speed and reliable design principle. [Background technique] [0002] With the continuous advancement and development of science and technology, there are more and more vehicle detection methods. Vehicle detection methods in the prior art are mainly based on infrared rays, ultrasonic waves, ground induction coils or geomagnetic sensors. Among them, the development of geomagnetic sensors is getting faster and faster, and geomagnetic sensors can be used to detect the existence of vehicles and identify vehicle types. The current geomagnetic sensor detection technology mainly uses the influence of the vehicle on the earth's magnetic field to complete vehicle detection. It has the advantages of simple installation, small space occupation, no response to non-ferromag...

AI Technical Summary

Problems solved by technology

The method for improving the accuracy of the geomagnetic parking space detector disclosed in this patent document avoids the influence of the geomagnetic sensor by the ambient temperature, but it judges whether there is a vehicle parked by the temperature difference threshold, and there will still be vibrations near the threshold. The detection state is extremely unstable, the detection accuracy is low, and the detection reliability is poor; in addition, it is also easily affected by interfering vehicles, such as bicycles, battery cars, tricycles, engineering vehicles, trucks or buses, etc., which affect the detection speed

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