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公开(公告)号：US11555699B2
公开(公告)日：2023-01-17
申请号：US16364657
申请日：2019-03-26
Applicant: NextNav, LLC
Inventor： Michael Dormody , Guiyuan Han , Badrinath Nagarajan
Abstract: Determining when an estimated altitude of a mobile device can be used for calibration or location determination. Particular systems and methods determine an area in which the mobile device is expected to reside, determine an altitude value of each section of a plurality of sections in the area, determine if the altitude values meet a threshold condition, and determine that the estimated altitude of the mobile device can be used for determining the position of the mobile device or for calibrating a pressure sensor of the mobile device when the altitude values meet the threshold condition.
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公开(公告)号：US11243076B2
公开(公告)日：2022-02-08
申请号：US16380120
申请日：2019-04-10
Applicant: NextNav, LLC
Inventor： Badrinath Nagarajan , Guiyuan Han , Michael Dormody
Abstract: Extending the spatial coverage of a reference pressure network. Particular embodiments described herein include machines that initially determine that an estimated position of a mobile device resides outside a coverage area of a network of reference pressure sensors. Reference-level pressures corresponding to reference pressure sensors of the network are determined using measurements of pressure from the network of reference pressure sensors. A pressure pattern for a region that includes the estimated position and an area not included in the coverage area of the network is determined using reference-level pressures that were not determined using measurements of pressure from the network of reference pressure sensors. The reference-level pressures corresponding to reference pressure sensors of the network and the pressure pattern are used to determine a reference-level pressure value for use in calibrating a pressure sensor of the mobile device or for use in estimating an altitude of the mobile device.
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公开(公告)号：US10514258B2
公开(公告)日：2019-12-24
申请号：US15692142
申请日：2017-08-31
Applicant: NextNav, LLC
Inventor： Michael Dormody , Ganesh Pattabiraman , Abijith Kumar , Thomas Wolf , Gary Parsons , Christian Gates , Deepak Joseph , Badrinath Nagarajan
Abstract: Calibrating an unstable sensor of a mobile device. Systems and methods for calibrating a sensor of a mobile device determine a first estimated position of the mobile device without using any measurement from the sensor of the mobile device, generate a second estimated position of the mobile device using a measurement from the sensor, estimate a sensor error of the sensor using the first estimated position and the second estimated position, and use the sensor error to determine a calibration value for adjusting one or more measurements from the sensor.
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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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25.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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Patent Agency Ranking
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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公开(公告)号：US11199406B2
公开(公告)日：2021-12-14
申请号：US16684859
申请日：2019-11-15
Applicant: NextNav, LLC
Inventor： Michael Dormody , Ganesh Pattabiraman , Abijith Kumar , Thomas Wolf , Gary Parsons , Christian Gates , Deepak Joseph , Badrinath Nagarajan
Abstract: Calibrating an unstable sensor of a mobile device. Systems and methods for calibrating a sensor of a mobile device determine a first estimated position of the mobile device without using any measurement from the sensor of the mobile device, generate a second estimated position of the mobile device using a measurement from the sensor, estimate a sensor error of the sensor using the first estimated position and the second estimated position, and use the sensor error to determine a calibration value for adjusting one or more measurements from the sensor.
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29.发明授权公开(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
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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公开(公告)号：US11064320B2
公开(公告)日：2021-07-13
申请号：US15930289
申请日：2020-05-12
Applicant: NextNav, LLC
Inventor： Michael Dormody , Arun Raghupathy , Badrinath Nagarajan , Guiyuan Han
Abstract: Using a pressure sensor of a mobile device to improve the reliability 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 one or more measurements of pressure from a pressure sensor of the mobile device.
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