基于iOS平台的步长计算方案与实现

GPS一般不适用于室内环境定位,惯性导航是一种常用的室内定位技术。对此,提出了一种基于iOS平台的行走步长计算方法,通过iOS设备内置加速度计采集数据,计算腰部的竖直位移。行走时,人体的腰部轨迹相对于前进方向近似1个倒置单摆模型,依据此运动模型可以计算行走的步长。此外还给出了在iPhone上实现步长计算的软件实现方案,并设计了应用软件。实验表明,所提出的步长计算方案和软件可以实时显示行进的步长和总位移,测量结果较准确,误差约为5%,该方法可为开发室内定位系统提供一定理论依据。

Design and implementation of step length calculation based on iOS platform

GPS is generally not suitable for indoor environment positioning~ inertial navigation is a common indoor positioning technology. In this regard, this paper presents a step length calculation system, which is used for lOS devices. Collecting iOS devices＇ built-in accelerometer data, the displacement of waist in vertical direction can be obtained. When walking, the body＇s waist trajectory relative to the forward direction is an approximation of the inverted pendulum model. According to the motion model, the step length can be calculated. In addition, this paper gives the software implementation of step length calculation on iPhone and designs the corresponding software. The experiments show that the step length calculation programs and software can display the step length and total displacement of the moving in real-time. The measurement results indicate higher level of accuracy and the error is about 5 %. The method provides some theoretical basis for the development of indoor positioning system.