For example: 1, if the mileage equivalent to movement is installed, it should be the product of the average step size and your complement, which is actually an unbiased estimation concept;
2. Everyone's stride is different. You can only calculate a rough step size according to your age and height, and then multiply it by your steps.
3. This method, I don't know if QQ has this right, is to call the gyroscope in your mobile phone and use it to calculate your itinerary in real time. General data is processed and can be called directly. If not, write your own Kalman filter, and then calculate the numerical integration to estimate.