公开(公告)号：US20240085185A1

公开(公告)日：2024-03-14

申请号：US18462324

申请日：2023-09-06

Applicant: Apple Inc.

Inventor： Stephen P. Jackson ,  Ti-Yen Lan ,  Yi Wen Liao ,  Alexandru Popovici ,  Igor Tchertkov ,  Rose M. Wahlin ,  Natisa Jeyakanthan ,  Amit K. Jain ,  Kenneth M. Lee

IPC: G01C21/16

CPC classification number: G01C21/165 ,  G01C21/183

Abstract: Embodiments are disclosed for submersion detection and underwater depth and low-latency temperature estimation. In an embodiment, a method comprises: determining a first set of vertical accelerations obtained from an inertial sensor of a wearable device; determining a second set of vertical accelerations obtained from pressure data; determining a first feature associated with a correlation between the first and second sets of vertical accelerations; and determining that the wearable device is submerged or not submerged in water based on a machine learning model applied to the first feature. In another embodiment, a method comprises: determining a submersion state of a wearable device; and responsive to the submersion state being submerged, computing a forward estimate of water temperature based on measured ambient water temperature at the water surface, a temperature error lookup table, and a rate of change of the ambient water temperature.