公开(公告)号：US20190086552A1

公开(公告)日：2019-03-21

申请号：US15892442

申请日：2018-02-09

Applicant: QUALCOMM Incorporated

Inventor： David TUCK ,  Michael KOENIG

IPC: G01S19/19 ,  G01P3/80 ,  G01P5/22

Abstract: Techniques are provided for determining a moving body's position and velocity in the presence of motion of a measuring device relative to the body. For example, a swimmer's position and velocity may be determined by compensating for bias that may result from a swimmer's arm swing. This may help avoid over-estimating a swimmer's velocity that results in inaccurate position estimation along the swimmer's path. To compensate for the swimmer's arm swing, an estimate of translational velocity due to arm rotation may be removed, e.g., from pseudo-range rates (PRRs) from satellite positioning system measurements, to reduce the systematic bias errors. A scale factor is applied to an estimated velocity of the swimmer's body to estimate the velocity of a mobile device on the swimmer's wrist, e.g., while above water.