公开(公告)号：US09086281B1

公开(公告)日：2015-07-21

申请号：US13898635

申请日：2013-05-21

Applicant: AMAZON TECHNOLOGIES, INC.

Inventor： Arvind Thiagarajan ,  James Joseph Wolfe ,  Anand Balakrishnan

IPC: G01C21/26 ,  G01C21/32 ,  G01C21/10

CPC classification number: G01C21/10 ,  G01C21/16 ,  G01C22/006

Abstract: Techniques are described for determining a direction in which a computing device is being transported by a user who is walking, running, or otherwise moving relative to a direction in which the device is being held. Acceleration data may be collected by accelerometers of the device during a time window, and transformed to determine a rotated acceleration along one or more candidate directions. The rotated acceleration is transformed to a frequency domain, and a peak power is determined within the frequency transformed acceleration data for each candidate direction. The peak powers are compared across multiple candidate directions, and the candidate direction having a higher peak power may be designated as a movement direction of the device relative to the device orientation. A gross movement direction may be determined based on magnetometer data, and may be employed for navigation or other applications.

Abstract translation: 描述了用于确定计算设备正在相对于正在保持设备的方向行进，运行或以其他方式移动的用户被传送的方向的技术。 加速度数据可以在时间窗口期间由装置的加速度计收集，并且被变换以确定沿着一个或多个候选方向的旋转加速度。 将旋转的加速度变换为频域，并且在每个候选方向的频率变换的加速度数据内确定峰值功率。 在多个候选方向上比较峰值功率，并且具有较高峰值功率的候选方向可以被指定为器件相对于器件取向的移动方向。 总移动方向可以基于磁力计数据来确定，并且可以用于导航或其他应用。