Method for acquiring transportation traffic speed based on geomagnetic sensing technology

The invention discloses a method for acquiring transportation traffic speed based on a geomagnetic sensing technology in the technical filed of transportation state detection sensors, which is used for accurately acquiring speed information of transportation vehicles. The method comprises the following steps: pre-processing geomagnetic waveform data received by a geomagnetic sensor; determining whether a vehicle is close to the geomagnetic sensor or not according to the processed geomagnetic waveform data; determining whether the vehicle is in a halted state or not according to the processed geomagnetic waveform data; selecting a starting point when the vehicle is close to the sensor and a terminal point when the vehicle leaves the sensor from the geomagnetic waveform data when the vehicle passes by the geomagnetic sensor; calculating the vehicle speed by using different algorithms; and fusing the vehicle speed calculated by different algorithms to acquire the final vehicle speed. The method solves different vehicle speeds, and calculates the fusion speed by a fusion algorithm according to the geomagnetic waveform data and different algorithms.