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    Systems and methods for estimating a difference in height between two floors in a building for use in estimating a height or an altitude of one of the two floors
    11.
    发明授权
    Systems and methods for estimating a difference in height between two floors in a building for use in estimating a height or an altitude of one of the two floors 有权

    公开(公告)号：US11460298B2

    公开(公告)日：2022-10-04

    申请号：US16364827

    申请日：2019-03-26

    Applicant: NextNav, LLC

    Inventor： Guiyuan Han ,  Badrinath Nagarajan ,  Michael Dormody

    IPC: G01C5/06 ,  G01C21/20 ,  H04W64/00

    Abstract: Estimating a difference in height between two floors in a building for use in estimating a height or an altitude of one of the two floors. Particular embodiments estimate a height difference between a first floor and a second floor based on a first outdoor temperature of a first time period, a second outdoor temperature of a second time period, a third temperature that is based on an indoor temperature of the first time period or the second time period, a first estimated difference in height between the first and second floors that is based on measurements of pressure from mobile devices when those mobile devices were on the first and second floors during the first time period, and a second estimated difference in height between the first and second floors that is based on measurements of pressure from mobile devices when those mobile devices were on the first and second floors during the second time period.

    Systems and methods for determining contexts of mobile devices
    12.
    发明授权
    Systems and methods for determining contexts of mobile devices 有权

    公开(公告)号：US11204646B2

    公开(公告)日：2021-12-21

    申请号：US15930304

    申请日：2020-05-12

    Applicant: NextNav, LLC

    Inventor： Michael Dormody ,  Arun Raghupathy ,  Badrinath Nagarajan ,  Guiyuan Han

    IPC: G06F3/01 ,  H04M1/72457 ,  H04M1/72403 ,  H04M1/72454 ,  G01P15/02 ,  G06F3/041 ,  H04N21/45 ,  H04W4/021

    Abstract: Determining contexts of mobile devices. Particular embodiments described herein include machines that determine two estimated positions of a mobile device that respectively correspond to first and second locations at first and second times, acquire sets of terrain or structural information for first and second areas that respectively include the first and second estimated positions, use the acquired sets of information and the estimated positions to determine if the mobile device was within a structure at the first and second times, determine one or more values that are indicative of vertical movement by the mobile device during a period of time between the first time and the second time, compare the one or more values to one or more threshold conditions, and determine a context of the mobile device based on the comparison.

    Systems and methods for estimating and altitude of a mobile device based on detected temperature conditions
    13.
    发明授权
    Systems and methods for estimating and altitude of a mobile device based on detected temperature conditions 有权

    公开(公告)号：US10378894B2

    公开(公告)日：2019-08-13

    申请号：US15683513

    申请日：2017-08-22

    Applicant: NextNav, LLC

    Inventor： Michael Dormody ,  Badrinath Nagarajan ,  Guiyuan Han

    IPC: G01C5/06 ,  G01C25/00 ,  G01K7/00 ,  G01L7/00

    Abstract: Identifying and estimating values of atmospheric conditions for use in estimating an altitude of a mobile device. Systems and methods for monitoring one or more conditions before estimating an altitude of a mobile device may receive a reference pressure that was determined using a measurement of pressure measured by a reference pressure sensor, and determine if a temperature condition is detected. After determining that the temperature condition is not detected, the systems and methods may compute a first estimate of an altitude of a mobile device using the reference pressure. After determining that the temperature condition is detected, the systems and methods may compute an estimate of a pressure at the location of the reference pressure sensor using the reference pressure, a first measurement of temperature that was used to compute the reference pressure, an estimated altitude of the location of the reference pressure sensor, and the reference altitude, and then compute a second estimate of the altitude of the mobile device using the estimate of pressure and a second measurement of temperature that was measured at another location that is different from the location of the reference pressure sensor.

    Constraining barometric pressure sensor calibration with sporadic data collection
    17.
    发明授权
    Constraining barometric pressure sensor calibration with sporadic data collection 有权

    公开(公告)号：US11333567B2

    公开(公告)日：2022-05-17

    申请号：US17303691

    申请日：2021-06-04

    Applicant: NextNav, LLC

    Inventor： Michael Dormody ,  Guiyuan Han ,  Badrinath Nagarajan ,  Arun Raghupathy

    IPC: G01L27/00 ,  G01C5/06

    Abstract: Multiple calibration results for calibrating a barometric pressure sensor based on data received from a device containing the sensor are determined and stored in a table. The table is updated based on rules regarding a relationship between each calibration result and a current calibration value. The calibration results are weighted and combined to determine a combined calibration result. The calibration value for calibrating the sensor is selected from the calibration results, the combined calibration results, or the current calibration value based on a selection criteria.

    Systems and methods for determining when to calibrate a pressure sensor of a mobile device
    18.
    发明授权
    Systems and methods for determining when to calibrate a pressure sensor of a mobile device 有权

    公开(公告)号：US11073441B2

    公开(公告)日：2021-07-27

    申请号：US16364695

    申请日：2019-03-26

    Applicant: NextNav, LLC

    Inventor： Michael Dormody ,  Guiyuan Han ,  Badrinath Nagarajan

    IPC: G01L27/00 ,  G01L19/00 ,  G01C21/20

    Abstract: Determining when to calibrate a pressure sensor of a mobile device. Particular systems and methods determine values of a plurality of metrics based on how data collected at a first location of a mobile device relates to threshold conditions, determine weights for the metric values, determine weighted metric values by applying the weights to the metric values, use the weighted metric values to determine if a pressure sensor of the mobile device should be calibrated using information associated with the first location, and calibrate the pressure sensor of the mobile device using the information associated with the first location if a determination is made that the pressure sensor of the mobile device should be calibrated using information associated with the first location.

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