公开(公告)号：US10359288B2

公开(公告)日：2019-07-23

申请号：US14375711

申请日：2013-03-26

Applicant: Google LLC

Inventor： Qingxuan Yang ,  Edward Y. Chang

IPC: G01C21/16 ,  G01C22/00 ,  H04W88/02

Abstract: Disclosed here are methods and systems that relate to determining a moving direction of a mobile device user. The methods and systems relate to using an inertial navigation system such as an accelerometer and gyroscope to aid in the determination of the moving direction of the user. The methods and systems may receive an acceleration reading associated with the mobile device, and determine a step frequency of the user based on the acceleration reading. The methods and systems may determine a theoretical model to fit the acceleration reading, and may determine the moving direction of the user based on the theoretical model.

公开(公告)号：US10228263B2

公开(公告)日：2019-03-12

申请号：US14776052

申请日：2013-03-15

Applicant: Google LLC

Inventor： Qingxuan Yang ,  Edward Chang

IPC: G01C17/38 ,  G01C25/00 ,  G01C21/16 ,  H04W4/02 ,  G01C9/02 ,  G06F1/04 ,  G06F3/0346

Abstract: A system and method for attitude correction is provided. An acceleration and an attitude of an electronic device are detected. A period of time where a velocity of the electronic device at the beginning of the period of time and a velocity of the electronic device at the end of the period of time are equal is identified. An attitude correction is calculated based on the identified period of time and the detected acceleration of the electronic device during the period of time. The detected attitude of the electronic device is corrected with the calculated attitude correction.