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公开(公告)号：US12270967B2
公开(公告)日：2025-04-08
申请号：US18053254
申请日：2022-11-07
Applicant: NextNav, LLC
Inventor： Michael Dormody , Guiyuan Han , Badrinath Nagarajan , Wei Liu , Prashant Dave , Arun Raghupathy
Abstract: 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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公开(公告)号：US12212706B2
公开(公告)日：2025-01-28
申请号：US18338583
申请日：2023-06-21
Applicant: NextNav, LLC
Inventor： William Alberth, Jr. , Michael Dormody
IPC: H04M1/725 , H04M1/72454 , H04W4/029 , H04W4/16
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：US12038280B2
公开(公告)日：2024-07-16
申请号：US18363329
申请日：2023-08-01
Applicant: NextNav, LLC
Inventor： Michael Dormody , Deepak Joseph , Badrinath Nagarajan , Guiyuan Han , Arun Raghupathy
CPC classification number: G01C17/38 , G01C5/06 , G01C21/10 , G01C21/165 , G01C25/00 , G01C25/005 , G01S5/02 , G01S19/14 , G01S19/40
Abstract: Calibrating a pressure sensor of a mobile device includes determining a first plurality of calibration values for a first plurality of visits to a first revisit zone to which a mobile device repeatedly returns; determining a first relative calibration adjustment value based on the first plurality of calibration values; determining an adjusted absolute calibration value based on i) an absolute calibration value used to calibrate pressure measurements made by a pressure sensor of the mobile device, and ii) the first relative calibration adjustment value; and calibrating pressure measurements made by the pressure sensor of the mobile device using the adjusted absolute calibration value.
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公开(公告)号：US11985569B2
公开(公告)日：2024-05-14
申请号：US17452862
申请日：2021-10-29
Applicant: NextNav, LLC
Inventor： Guiyuan Han , Michael Dormody , Badrinath Nagarajan , Arun Raghupathy
Abstract: A method to identify a problematic 2D position of a mobile device can include: determining a reported 2D position of the mobile device; determining a piece of information about the mobile device; and comparing the reported 2D position and the piece of information about the mobile device. Upon determining that the reported 2D position and the piece of information about the mobile device are consistent with each other, the reported 2D position of the mobile device is used as an estimate of the actual 2D position of the mobile device, or upon determining that the reported 2D position and the piece of information about the mobile device are not consistent with each other, the reported 2D position is determined to be problematic, and the reported 2D position of the mobile device is removed from a list of reported 2D positions of the mobile device.
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公开(公告)号：US11892295B2
公开(公告)日：2024-02-06
申请号：US17644029
申请日：2021-12-13
Applicant: NextNav, LLC
Inventor： Michael Dormody , Ganesh Pattabiraman , Abijith Kumar , Thomas Wolf , Gary Parsons , Christian Gates , Deepak Joseph , Badrinath Nagarajan
IPC: G01C17/38 , G01C25/00 , G01C5/06 , G01C21/16 , G01S19/14 , G01C21/10 , G01S5/02 , G01S19/40 , G01S5/00
CPC classification number: G01C17/38 , G01C5/06 , G01C21/10 , G01C21/165 , G01C25/00 , G01C25/005 , G01S19/14 , G01S5/012 , G01S5/017 , G01S5/02 , G01S19/40
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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Patent Agency Ranking
公开(公告)号：US11733038B2
公开(公告)日：2023-08-22
申请号：US17646810
申请日：2022-01-03
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：US11536564B2
公开(公告)日：2022-12-27
申请号：US16405687
申请日：2019-05-07
Applicant: NextNav, LLC
Inventor： Michael Dormody , Badrinath Nagarajan , Guiyuan Han
Abstract: Pressure-based estimation of a mobile device altitude or calibration of a pressure sensor involves machines that determine if a reference-level pressure value based on one or more measurements of pressure from a network of weather stations should or should not be used to calibrate a pressure sensor of a mobile device or to estimate an altitude of the mobile device. If reference-level pressure value should be used, the reference-level pressure value is used to calibrate a pressure sensor of a mobile device or to estimate an altitude of the mobile device. If the reference-level pressure value should not be used, a trend in pressure is determined, an estimated reference-level pressure value based on the trend is determined, and the estimated reference-level pressure value is used to calibrate a pressure sensor of a mobile device or to estimate an altitude of the mobile device.
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18.发明授权公开(公告)号：US11294099B1
公开(公告)日：2022-04-05
申请号：US16351219
申请日：2019-03-12
Applicant: NextNav, LLC
Inventor： Michael Dormody
Abstract: Calibrating weather stations using maximum allowed altitude errors. Particular embodiments described herein include machines that determine a maximum allowed pressure calibration error for a weather station in a network of weather stations, determine a temperature variation associated with an environment in which the weather station resides, determine a maximum allowed altitude error for the weather station using the maximum allowed pressure calibration error and the temperature variation, and use the maximum allowed altitude error to determine if a first maximum possible altitude error associated with a first approach for estimating an altitude of the weather station exceeds the maximum allowed altitude error. If the first maximum possible altitude error associated with the first approach does not exceed the maximum allowed altitude error, the first approach is used to estimate an altitude of the weather station for use in calibrating a pressure sensor of the weather station.
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公开(公告)号：US11255665B2
公开(公告)日：2022-02-22
申请号：US16380636
申请日：2019-04-10
Applicant: NextNav, LLC
Inventor： Badrinath Nagarajan , Guiyuan Han , Michael Dormody
Abstract: Determining where to place atmospheric sensors that provide measurements of pressure used to estimate an altitude of a mobile device in an environment. Generally, systems and methods determine where atmospheric sensors can be placed relative to each other in order to achieve a required level of accuracy when an altitude of a mobile device is estimated using pressure measurements from the atmospheric sensors in the network. Particular systems and methods determine a maximum distance for separating adjacent atmospheric sensors, or otherwise determine where to place atmospheric sensors relative to each other based on expected pressure distribution of an environment.
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公开(公告)号：US11196855B2
公开(公告)日：2021-12-07
申请号：US16944309
申请日：2020-07-31
Applicant: NextNav, LLC
Inventor： William Alberth, Jr. , Michael Dormody
IPC: H04M1/725 , H04M1/72454 , H04W4/029 , H04W4/16
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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