Step counting method based on 3D (three-dimensional) gravity sensor of intelligent mobile phone

Abstract

The invention relates to a step counting method based on a 3D (three-dimensional) gravity sensor of an intelligent mobile phone. The method comprises the following steps of: (1) acquiring original data of the gravity sensor; (2) filtering noise; (3) setting an initial value translation curve; (4) performing first order difference; (5) searching for zero crossing point of a first order difference curve; (6) filtering continuous zero values of the first order difference curve; (7) setting a threshold valve and filtering small-value turning points; (8) filtering with a 'fixed time window'; and (9) counting an effective step quantity. In the invention, a relatively accurate step counting mathematical model is established, so that various jitter errors are eliminated, the accuracy of a step counting result is increased, and better references are provided for healthy life of people; and the method can be implemented by using intelligent mobile phone step computer software and a special step counter, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of sensor applications, in particular to a step counting method based on a smart phone 3D gravity sensor. Background technique [0002] With the development of the mobile communication industry, the production and use of mobile phones have been greatly improved. Smartphones are no longer just a terminal of a communication network, but will also become a terminal of the Internet. In addition, smart phones are gradually entering the lives of ordinary people, which means that smart phones will become the main equipment for people to obtain information. Many kinds of sensors are integrated in some smartphones, and by using these sensors, many functions of special equipment can be realized on the mobile phone. Mobile phone pedometer service is one of them. It uses the gravity (acceleration) sensor embedded in the mobile phone to develop applications. The sports data statistics and energy consumption it provides are in li...

AI Technical Summary

Problems solved by technology

[0003] Most of the current pedometer functions are based on the gravity sensor, and the pedometer method is different in different products, resulting in different implementation efficiency and pedometer accuracy

However, due to various reasons such as different people walking in different ways, and the same person also has multiple walking styles, the law of the original data output by the gravity sensor is relatively complicated, and it is difficult to establish an accurate mathematical model, resulting in the inaccuracy of most step counting methods. high

Therefore, the existing step counting method needs to be improved, and a better method needs to be explored

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