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公开(公告)号：US11418914B2
公开(公告)日：2022-08-16
申请号：US17303686
申请日：2021-06-04
Applicant: NextNav, LLC
Inventor： Michael Dormody , Badrinath Nagarajan , Guiyuan Han , Arun Raghupathy
Abstract: A method involves determining, at a mobile device or a service, an uncertainty in height above a reference altitude, an estimated 2D position of the mobile device, and an uncertainty in terrain height above the reference altitude using the estimated 2D position. An uncertainty in height above terrain, of the mobile device, is determined at the mobile device or a server using the uncertainty in height above the reference altitude and the uncertainty in terrain height above the reference altitude.
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公开(公告)号：US11215453B2
公开(公告)日：2022-01-04
申请号：US17247011
申请日：2020-11-24
Applicant: NextNav, LLC
Inventor： Badrinath Nagarajan , Arun Raghupathy , Michael Dormody , Guiyuan Han
Abstract: Methods and machines involve detecting when a mobile device is in a first area and a second area at different times, collecting pressure data from the mobile device and reference sensor(s) to estimate altitudes of the mobile device within the first area and the second area, collecting terrain altitudes associated with the first area and the second area, and using a difference between the estimated altitudes and a difference between the terrain altitudes to determine a height of a floor. The estimated floor height may be used to calibrate a pressure sensor of a mobile device.
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公开(公告)号：US11181365B2
公开(公告)日：2021-11-23
申请号：US16364741
申请日：2019-03-26
Applicant: NextNav, LLC
Inventor： Badrinath Nagarajan , Guiyuan Han , Michael Dormody
Abstract: Determining which reference-level pressures, from among a plurality of available reference-level pressures, are used when estimating an altitude of a mobile device. Different systems and methods determine isobars based on reference-level pressures of weather stations, and then use the isobars in different ways to identify particular reference-level pressures for use in estimated an altitude of a mobile device. One approach determines the smallest distance between an initial estimated position of a mobile device and a neighboring isobar, and then uses that distance to identify reference-level pressures. Another approach identifies reference-level pressures between an isobar on which an initial estimated position of a mobile device is location and a neighboring isobar. Yet another approach compares the number of identified reference-level pressures and/or locations of the identified reference-level pressures against threshold conditions before determining which reference-level pressures to use.
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公开(公告)号：US10805452B2
公开(公告)日：2020-10-13
申请号：US16721184
申请日：2019-12-19
Applicant: NextNav, LLC
Inventor： William Alberth, Jr. , Michael Dormody
Abstract: Determining one or more heights of one or more mobile devices above surfaces. Particular embodiments described herein include machines that retrieve first data (e.g., measurement value(s) determined by sensor(s) of a mobile device or estimated position(s) of the mobile device), determine a location context based on the first data, identify second data (e.g., measurement value(s) determined by sensor(s) of the mobile device or status indicator value(s) of feature(s) of the mobile device) to retrieve for use in determining an estimated height above a surface at which the mobile device is located based on the determined location context, retrieve the second data, and determine an estimated height above a surface at which the mobile device is located based on the retrieved second data.
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公开(公告)号：US10704905B2
公开(公告)日：2020-07-07
申请号：US15676454
申请日：2017-08-14
Applicant: NextNav, LLC
Inventor： Michael Dormody , Badrinath Nagarajan , Guiyuan Han
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 computed using a measurement of pressure from a first reference pressure sensor at a first location, wherein the received reference pressure specifies an estimated pressure for a reference altitude, and determine if a threshold change in measured pressure by the first reference pressure sensor is detected. If the threshold change in measured pressure is detected, the systems and methods may compute a calibration value for the first reference pressure sensor, or if the threshold change in measured pressure is not detected, the systems and methods may identify a previously-determined calibration value. The systems and methods may then compute an adjusted reference pressure using the received reference pressure and either the computed calibration value or the previously-determined calibration value, and compute an estimate of the altitude of the mobile device using the adjusted reference pressure and a measurement of pressure from the mobile device.
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Patent Agency Ranking
公开(公告)号：US10477358B1
公开(公告)日：2019-11-12
申请号：US16364676
申请日：2019-03-26
Applicant: NextNav, LLC
Inventor： Michael Dormody , Guiyuan Han , Badrinath Nagarajan
Abstract: Determining whether a mobile device is inside an environment experiencing adverse pressure variation conditions. Particular systems and methods for determining whether a mobile device is inside an environment experiencing adverse pressure variation conditions detect a change in pressure measured by a mobile device that is caused by an HVAC effect of a building or a vehicle, determine a likelihood that the mobile device is inside a building based on an estimated position of the mobile device relative to the building, and determine that the mobile device is inside the building or inside a vehicle based on the likelihood that the mobile device is inside the building.
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公开(公告)号：US12101689B2
公开(公告)日：2024-09-24
申请号：US17816306
申请日：2022-07-29
Applicant: NextNav, LLC
Inventor： Michael Dormody , Badrinath Nagarajan , Guiyuan Han , Arun Raghupathy
Abstract: A method involves determining, at a mobile device or a service, an uncertainty in height above a reference altitude, an estimated 2D position of the mobile device, and an uncertainty in terrain height above the reference altitude using the estimated 2D position. An uncertainty in height above terrain, of the mobile device, is determined at the mobile device or a server using the uncertainty in height above the reference altitude and the uncertainty in terrain height above the reference altitude.
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48.发明授权公开(公告)号：US11991605B2
公开(公告)日：2024-05-21
申请号：US17305623
申请日：2021-07-12
Applicant: NextNav, LLC
Inventor： Michael Dormody , Arun Raghupathy , Badrinath Nagarajan , Guiyuan Han
CPC classification number: H04W4/38 , H04W4/025 , H04W4/029 , H04W64/006
Abstract: Using a pressure sensor of a mobile device to improve the accuracy of determined contexts. Particular embodiments described herein include machines that determine a context of a mobile device, and determine if the determined context is accurate using multiple measurements of pressure from a pressure sensor of the mobile device.
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公开(公告)号：US11674798B2
公开(公告)日：2023-06-13
申请号：US17248913
申请日：2021-02-12
Applicant: NextNav, LLC
Inventor： Michael Dormody , Guiyuan Han , Badrinath Nagarajan
CPC classification number: G01C5/06 , G01L27/005 , H04W4/029
Abstract: Determining calibration values for atmospheric sensors that provide measured pressures used for estimating altitudes of mobile devices. Particular systems and methods determine if any uncalibrated reference-level pressure estimates associated with an unstable pressure sensor should not be used when calibrating the unstable pressure sensor, and calibrate the unstable pressure sensor using all of the uncalibrated reference-level pressure estimates except any uncalibrated reference-level pressure estimate that should not be used when calibrating the unstable pressure sensor.
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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
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.
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