How to calculate WeChat exercise

WeChat Sports uses an acceleration sensor to detect up and down shaking to calculate the number of steps. The algorithm distinguishes between walking and non-walking movements, and adjusts step counting based on stride frequency, stride length, acceleration mode and environmental factors. At the same time, it passes static verification and stability Checksum and historical data calibration improve accuracy. Pedometer accuracy is affected by mobile phone model, carrying method, walking style and environmental factors.

How does WeChat Sports calculate steps?

Pedometer Principle

WeChat Sports uses the built-in acceleration sensor of the mobile phone to count the number of steps. When a user walks around, the phone will feel an up-and-down movement, and the sensor will record these movements and convert them into steps.

Algorithm settings

The algorithm used by WeChat Sports has been optimized and can distinguish walking from other sports such as riding a car and running. The algorithm adjusts based on the following factors:

• Cadence: The cadence range during normal walking
• Stride length: The user’s Average stride length, calibrated by historical data
• Acceleration pattern:Acceleration pattern for phone shaking to identify walking and non-walking activities
• Environmental factors:Environmental factors such as air pressure and temperature will also affect the accuracy of step counting

Calibration mechanism

In order to improve the accuracy of step counting, WeChat Sports uses the following calibration Verification mechanism:

• Station verification: When the phone is stationary, the algorithm will filter out any shaking signals.
• Smooth verification: When the phone moves quickly (such as running or riding in a car), the algorithm will suppress step counting to prevent false step counting.
• Historical data calibration: WeChat Sports will automatically calibrate the algorithm based on the user's historical step data to adapt to different walking habits.

Influencing factors

The step counting accuracy of WeChat Sports is affected by the following factors:

• Mobile phone model and sensor Quality: The acceleration sensors of different mobile phones have different sensitivities, which will affect the accuracy of step counting.
• Carrying method: Putting your phone in a bag or pocket may cause the shaking signal to be blocked, affecting step counting.
• Walking method: Walking quickly or walking slowly will have different cadences, which will affect step counting.
• Environmental factors: Factors such as air pressure, temperature, etc. will affect the sensor sensitivity and thus the step counting accuracy.

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