Parking stall detection method based on geomagnetic sensor

Abstract

The invention belongs to the Internet of Things and smart city building field, to be specific, relates to a parking stall detection method based on a geomagnetic sensor. Compared with the prior art, the parking stall detection method gives more considerations to factors affecting parking stall detection results, and therefore the accuracy of the parking stall detection is improved, and good engineering practicability is provided. An artificial neural network is combined with a comprehensive detection algorithm of a network database, and then problems such as the instable detection state of the geomagnetic sensor caused by high sensitivity, fundamental frequency drift of a detected vehicle caused by the long term installation of the geomagnetic sensor on a lane, and the compensation of the geomagnetic sensor caused by large influences of temperature on the geomagnetic sensor, and interferences of different passing vehicles are solved, and therefore the precision and the accuracy of the parking stall detection are improved.

Description

technical field [0001] The invention belongs to the field of Internet of Things and smart city construction, and in particular relates to a parking space detection method based on a geomagnetic sensor. Background technique [0002] While the Intelligent Transportation System (ITS) is getting more and more attention, the vehicle detector, which is one of the information collection front-ends of the ITS, is also getting more and more attention from people in the industry. The vehicle detector takes the motor vehicle as the detection target, detects the passage or existence of the vehicle, collects relevant information, and provides data support for the intelligent transportation system. From home and abroad, the commonly used vehicle detectors mainly include magnetic induction coil vehicle detectors, ultrasonic vehicle detectors, infrared vehicle detectors, laser vehicle detectors, and video vehicle detectors. Geomagnetic vehicle detector is a vehicle detection technology bas...

AI Technical Summary

Problems solved by technology

This patent considers the interference of various vehicles to geomagnetic signals. The disadvantage is that it does not consider the sensitivity of geomagnetism itself and the influence of temperature on geomagnetism, nor does it consider the influence of fundamental frequency drift of geomagnetism for a long time

[0006] In summary, in the actual application of geomagnetic sensors in the prior art, some false detections may still occur. To judge whether there is a vehicle parked or not, because the geomagnetic sensor itself is very sensitive, it often oscillates near the set threshold, which will lead to an unstable detection state; second, the geomagnetic sensor is installed on the driveway for a long time to detect vehicles. The geomagnetic sensor itself will have fundamental frequency drift and distortion, which will lead to false detection of parking spaces; third, the geomagnetic sensor itself is greatly affected by temperature, even at the same place and under the same conditions. However, great changes have taken place, especially when used under outdoor conditions, it is very easy to cause false detection due to temperature; fourth, the actual parking lot environment is complex, with cars coming and going in the parking lot, and different car owners have different parking modes. Parking spaces are subject to different disturbances, so there will be ever-changing detection data in this complex environment. Therefore, only a few fixed thresholds or fixed patterns are used to identify the relevant status of parking spaces, which is prone to false detection

How to solve the above four defects at the same time, improve the precision and accuracy of parking space detection, and avoid false detection, there is no definite technical solution yet

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