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公开(公告)号：US12209924B2
公开(公告)日：2025-01-28
申请号：US18495124
申请日：2023-10-26
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：US12130155B2
公开(公告)日：2024-10-29
申请号：US18309199
申请日：2023-04-28
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：US12061096B2
公开(公告)日：2024-08-13
申请号：US17443281
申请日：2021-07-23
Applicant: NextNav, LLC
Inventor： Michael Dormody , Badrinath Nagarajan , Arun Raghupathy , Guiyuan Han
Abstract: A wholistic activity context is used to determine whether to calibrate a barometric pressure sensor of a mobile device. A pair of activity transitions are determined from three activities of the mobile device. A time relationship and a position relationship between the activity transitions is determined. An opportunity to calibrate the barometric pressure sensor occurs between the activity transitions. A calibration of the barometric pressure sensor is performed in response to determining that the time relationship and the position relationship indicate that the wholistic activity context surrounding the opportunity to calibrate the barometric pressure sensor is conducive to calibration.
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公开(公告)号：US11808608B2
公开(公告)日：2023-11-07
申请号：US17649746
申请日：2022-02-02
Applicant: NextNav, LLC
Inventor： Badrinath Nagarajan , Guiyuan Han , Michael Dormody
CPC classification number: G01C5/06 , G01C21/206
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：US11669170B2
公开(公告)日：2023-06-06
申请号：US17644918
申请日：2021-12-17
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
CPC classification number: G06F3/017 , G01P15/02 , G06F3/041 , H04M1/72403 , H04M1/72454 , H04M1/72457 , H04N21/4524 , 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 near or 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.
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Patent Agency Ranking
公开(公告)号：US11579036B2
公开(公告)日：2023-02-14
申请号：US17660011
申请日：2022-04-20
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：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：US10064017B2
公开(公告)日：2018-08-28
申请号：US15487215
申请日：2017-04-13
Applicant: NextNav, LLC
Inventor： Guiyuan Han , Michael Dormody , Thomas Wolf , Ganesh Pattabiraman
CPC classification number: G01C5/00 , F24F11/62 , F24F2110/10 , F24F2110/40 , F24F2221/50 , G01C5/06 , G01W1/06 , H04W4/30 , H04W4/33
Abstract: Determining building weather profile parameters, and correcting an estimated altitude of a receiver using the building weather profile parameters. Systems and methods for estimating an altitude of a receiver using building weather profile parameters may identify one or more weather profile parameters for a building, determine an initial estimate of a receiver's altitude at a floor inside the building, and use the initial estimate and the identified weather profile parameters to determine a corrected estimate of the receiver's altitude at the floor.
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