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1.发明公开公开(公告)号：US20230152490A1
公开(公告)日：2023-05-18
申请号：US18053907
申请日：2022-11-09
申请人： NextNav, LLC
发明人： Badrinath NAGARAJAN , Prashant DAVE , Michael DORMODY , Guiyuan HAN , Wei LIU
摘要： A method involves determining an estimated position of a mobile device within a region. Atmospheric data measurement stations are identified within the region. A geographical anomaly is identified within the region that physically intervenes between the mobile device and a first atmospheric data measurement station. Based on a positional relationship between the mobile device, the geographical anomaly, and the first atmospheric data measurement station, it is determined that atmospheric pressure measurements collected at the first atmospheric data measurement station should be conditionally used for determining a reference pressure estimate. The reference pressure estimate is determined using a plurality of atmospheric pressure measurements collected at the atmospheric data measurement stations and conditionally using the atmospheric pressure measurements collected at the first atmospheric data measurement station. An estimated altitude of the mobile device is determined using a measurement of atmospheric pressure at the mobile device and the reference pressure estimate.
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2.发明公开公开(公告)号：US20240310188A1
公开(公告)日：2024-09-19
申请号：US18599901
申请日：2024-03-08
申请人： NextNav, LLC
发明人： Michael DORMODY , Wei LIU
摘要： Estimated positions of a computing device and whether the computing device is inside a building are determined. Atmospheric pressure measurements are collected when inside the buildings using a barometric pressure sensor of the computing device. Heights of the buildings are determined. Calibration values based on the heights of the buildings and the atmospheric pressure measurements are determined. A combined calibration value is determined based on the plurality of calibration values. The combined calibration value corresponds to a numerical overlap region of the plurality of calibration values.
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公开(公告)号：US20230152489A1
公开(公告)日：2023-05-18
申请号：US18053254
申请日：2022-11-07
申请人： NextNav, LLC
发明人： Michael DORMODY , Guiyuan HAN , Badrinath NAGARAJAN , Wei LIU , Prashant DAVE , Arun RAGHUPATHY
摘要： Field calibration of a pressure device involves collecting simultaneous pressure data or pressure and temperature data at two devices for multiple time points. Pressure differences between pairs of simultaneous data points of the collected pressure data are calculated. A model is fitted to the pressure differences and the temperatures and/or pressures, and model parameters are used to correct measurements from the second device. Alternatively, a pressure gradient is estimated for a region that encompasses the two devices for each time point. A distance is determined between the two devices. A pressure gradient difference is determined between the two devices for each time point. A pressure difference offset is obtained for one of the pairs of simultaneous data points for each time point. An average pressure difference offset is determined between the two devices and is used to correct measurements from one of the devices.
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