Patent ID: 11921187
Assignee: AMAZON TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. The monitoring device of claim 1, the operations further comprising:
generating, using the data, a plot of points that represent the energy values at the respective different distances for the plurality of time frames;
calculating, from the points, a plurality of average distances for the plurality of time frames, each of the plurality of average distances being calculated using at least one point corresponding to a reflection of a first portion of the FMCW ultrasonic signals and at least one point corresponding to a reflection of a second portion of the FMCW ultrasonic signals; and
analyzing, using a Kalman filter, the plurality of average distances in a successive sequence based at least in part on which of the plurality of time frames individual ones of the average distances correspond; and
determining, based at least in part on the analyzing, distance-trajectory data that indicates distances between the object and the monitoring device during the period of time.