Method and device for detecting vehicle based on state machine
A vehicle detection and state machine technology, which is applied in the field of vehicle detection, can solve the problems of low detection accuracy, failure to consider the drift of environmental geomagnetic signals, and the detection device cannot work stably for a long time, and achieve high detection accuracy, strong anti-interference ability, good robustness
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[0023] Example one:
[0024] figure 1 The flow of the vehicle detection method based on the state machine provided by the first embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown.
[0025] Such as figure 1 As shown, the state machine-based vehicle detection method provided in this embodiment includes the following steps:
[0026] Step S101: Acquire the original geomagnetic signal r output by the wireless geomagnetic sensor in real time i (k), and perform sliding window filtering to obtain a smooth geomagnetic signal a i (k).
[0027] This embodiment uses a three-axis geomagnetic sensor to detect vehicles. Usually the three-axis geomagnetic sensor is installed on the road surface or embedded in the road. When a vehicle passes by on the road, the geomagnetic signal changes, and the three-axis geomagnetic sensor collects When the original geomagnetic signal changes, this embodiment...
Example Embodiment
[0053] Embodiment two:
[0054] image 3 The structure of the vehicle detection device based on the state machine provided by the second embodiment of the present invention is shown. For ease of description, only the parts related to the embodiment of the present invention are shown.
[0055] The vehicle detection device based on a state machine provided in this embodiment includes:
[0056] The signal acquisition and filtering module 301 is used to obtain the original geomagnetic signal r output by the three-axis geomagnetic sensor in real time i (k), and perform sliding window filtering to obtain a smooth geomagnetic signal a i (k);
[0057] The background environment update module 302 is used for according to the current output state of the state machine and the smooth geomagnetic signal a i (k) Update the current background environment geomagnetic signal bi(k);
[0058] Binarization processing output module 303, used to calculate the smooth geomagnetic signal a i (k) The differenc...
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