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公开(公告)号：US20240298950A1
公开(公告)日：2024-09-12
申请号：US18596975
申请日：2024-03-06
申请人： CloudNav Inc.
发明人： Jeffery DECH , Erik E. ANDERSON , Ben KOKES
CPC分类号： A61B5/243 , A61B5/6804 , A61B5/721 , A61B5/7221 , A61B5/726 , A61B2503/02 , A61B2562/0219 , A61B2562/0223
摘要： Devices, systems and methods for monitoring of fetal health through determination of fetal heart rate are described. In an example, beat-to-beat decelerations and accelerations are monitored to estimate fetal position and orientation within the womb using magnetometer sensors. The described embodiments enable long-term monitoring that can be remote from a clinical setting, and is sufficiently portable to be operable while the mother engages in substantial motion during daily activity. An example method includes receiving, from a magnetic sensor, a combined heart signal comprising a mixture of a maternal heart signal and the fetal heart signal, estimating, based on the combined heart signal, one or more parameters associated with a location/motion of the magnetic sensor, generating a de-noised combined heart signal by performing a de-noising operation on the combined heart signal, and tracking, based on the de-noised combined heart signal, an estimate of the fetal heart signal.
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2.发明申请公开(公告)号：US20220244074A1
公开(公告)日：2022-08-04
申请号：US17649346
申请日：2022-01-28
申请人： CloudNav Inc.
摘要： Devices and methods for automatic calibration of rate gyroscope bias are described. One example method includes receiving, while the device is in motion, a plurality of measurements from one or more sensors, including a gyroscope, in the device. In this example, the plurality of measurements is acquired over a time period. The method also includes identifying one or more time segments, within the time period, having a low motion activity of the device by comparing a computed value associated with a motion of the device to a predetermined threshold. The method further includes determining, based on one or more measurements acquired over the one or more time segments, a degree of motion metric for at least one of the one or more sensors, and determining, based on the degree of motion metric for the at least one of one or more sensors, an estimate of a bias of the gyroscope.
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