公开(公告)号：US10520330B2

公开(公告)日：2019-12-31

申请号：US14595116

申请日：2015-01-12

Applicant: TATA CONSULTANCY SERVICES LIMITED

Inventor： Avik Ghose ,  Abhinav Kumar ,  Chirabrata Bhaumik ,  Arpan Pal

IPC: G01C22/00 ,  G01C21/16

Abstract: A mobile device and a method for estimation of direction of motion of a user are described. The mobile device comprises an inertial sensor to capture acceleration signals based on motion of the user and a direction estimation module. The direction estimation module determines direction of gravity based on filtering acceleration values obtained from captured the acceleration signals using a low-pass filter to identify a plane orthogonal to the direction of gravity. The plane orthogonal to the gravity comprises two orthogonal axes orthogonal to the direction of gravity. Further, displacement values are evaluated based on a user input for placement of the mobile device with respect to user's body, and integration of the acceleration values across the two orthogonal axes with respect to time. A direction of motion of the user is estimated based on a ratio of the displacement values along the two orthogonal axes.

公开(公告)号：US20150198625A1

公开(公告)日：2015-07-16

申请号：US14595116

申请日：2015-01-12

Applicant: TATA CONSULTANCY SERVICES LIMITED

Inventor： Avik Ghose ,  Abhinav Kumar ,  Chirabrata Bhaumik ,  Arpan Pal

IPC: G01P15/02

Abstract: A mobile device and a method for estimation of direction of motion of a user are described. The mobile device comprises an inertial sensor to capture acceleration signals based on motion of the user and a direction estimation module. The direction estimation module determines direction of gravity based on filtering acceleration values obtained from captured the acceleration signals using a low-pass filter to identify a plane orthogonal to the direction of gravity. The plane orthogonal to the gravity comprises two orthogonal axes orthogonal to the direction of gravity. Further, displacement values are evaluated based on a user input for placement of the mobile device with respect to user's body, and integration of the acceleration values across the two orthogonal axes with respect to time. A direction of motion of the user is estimated based on a ratio of the displacement values along the two orthogonal axes.

Abstract translation: 描述用于估计用户的运动方向的移动设备和方法。 移动设备包括惯性传感器，用于基于用户的运动和方向估计模块捕获加速度信号。 方向估计模块基于使用低通滤波器从捕获的加速度信号获得的滤波加速度值来确定重力方向，以识别与重力方向正交的平面。 与重力正交的平面包括与重力方向正交的两个正交轴。 此外，基于用于移动设备相对于用户身体的放置的用户输入以及相对于时间在两个正交轴上的加速度值的积分来评估位移值。 基于沿着两个正交轴的位移值的比率来估计用户的运动方向。