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公开(公告)号：US20230221144A1
公开(公告)日：2023-07-13
申请号：US18151178
申请日：2023-01-06
Applicant: NextNav, LLC
Inventor： Michael DORMODY , Guiyuan HAN , Badrinath NAGARAJAN , Arun RAGHUPATHY
Abstract: A method involves identifying multiple calibration values and corresponding calibration confidence values of an initial calibration dataset in which one or more calibration values were derived using an atmospheric pressure measurement from a barometric air pressure sensor of a mobile device. A calibration metric is determined for each calibration value. One or more of the calibration values are filtered out from the initial calibration dataset based on the calibration metric to generate a filtered calibration dataset. A filtered calibration value is determined using the filtered calibration dataset. The barometric air pressure sensor of the mobile device is calibrated using the filtered calibration value.
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公开(公告)号：US20230075640A1
公开(公告)日：2023-03-09
申请号：US17447027
申请日：2021-09-07
Applicant: NextNav, LLC
Inventor： Michael DORMODY , Badrinath NAGARAJAN , Arun RAGHUPATHY , Guiyuan HAN
Abstract: A calculated current lapse rate is determined for a geographical area that includes a location of a mobile device. The calculated current lapse rate provides an estimated air temperature variation with respect to altitude variation for the location of the mobile device. An altitude of the mobile device is estimated. An uncertainty of the altitude of the mobile device is estimated based on a reference pressure and a reference temperature for a reference plane that is within the geographical area, a device pressure for the mobile device, and the calculated current lapse rate.
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公开(公告)号：US20230003520A1
公开(公告)日：2023-01-05
申请号：US17931714
申请日：2022-09-13
Applicant: NextNav, LLC
Inventor： Guiyuan HAN , Badrinath NAGARAJAN , Michael DORMODY
Abstract: Estimating a difference in height between floors in a building for use in estimating a height or an altitude of one of the floors. A height difference is estimated between a first floor and a second floor based on outdoor temperatures of first and second time periods, an indoor temperature of the first or second time period, and first and second estimated differences in height between the first and second floors that is based on measurements of pressure from mobile devices when the mobile devices were on the first and second floors during the first and second time periods.
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公开(公告)号：US20250052571A1
公开(公告)日：2025-02-13
申请号：US18791640
申请日：2024-08-01
Applicant: NextNav, LLC
Inventor： Badrinath NAGARAJAN , Michael DORMODY , Guiyuan HAN
Abstract: A method involves determining an estimated position of a mobile device and determining that the estimated position of the mobile device is outside a coverage area of a first network of reference pressure sensors. For each reference pressure sensor of the first network, a distance between a respective reference pressure sensor and the estimated position of the mobile device is determined. A first reference pressure sensor that is nearest to the estimated position of the mobile device as compared to other reference pressure sensors of the first network is then identified. An assigned reference-level pressure value is determined using a first reference pressure measured at the first reference pressure sensor, and an estimated altitude of the mobile device is determined, or a pressure sensor of the mobile device is calibrated, using the assigned reference-level pressure value.
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公开(公告)号：US20230384087A1
公开(公告)日：2023-11-30
申请号：US18322874
申请日：2023-05-24
Applicant: NextNav, LLC
Inventor： Michael DORMODY , Badrinath NAGARAJAN , Guiyuan HAN , Arun RAGHUPATHY
CPC classification number: G01C5/06 , G01C21/206
Abstract: A method involves selecting a set of altitude envelope distribution constraints for a building and generating a set of altitude envelope distributions for the building in accordance with the constraints. Each altitude envelope distribution includes one or more first altitude envelopes. An aggregate altitude envelope distribution is generated for the building using the set of altitude envelope distributions and in accordance with the constraints. The aggregate altitude envelope distribution includes one or more second altitude envelopes. A reference altitude of the building is determined, and an absolute aggregate altitude envelope distribution is determined using the reference altitude and the aggregate altitude envelope distribution. The aggregate altitude envelope distribution includes one or more third altitude envelopes, each corresponding to a respective estimated floor number of the building.
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Patent Agency Ranking
公开(公告)号：US20230336656A1
公开(公告)日：2023-10-19
申请号：US18338583
申请日：2023-06-21
Applicant: NextNav, LLC
Inventor： William ALBERTH, JR. , Michael DORMODY
IPC: H04M1/72454 , H04W4/029 , H04W4/16
CPC classification number: H04M1/72454 , H04W4/029 , H04W4/16 , H04M2250/02 , H04M2250/12
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：US20230221203A1
公开(公告)日：2023-07-13
申请号：US18152228
申请日：2023-01-10
Applicant: NextNav, LLC
Inventor： Michael DORMODY , Deepak Joseph , Badrinath NAGARAJAN , Arun RAGHUPATHY , Frank Yenshaw
CPC classification number: G01L27/005 , G01S5/0295
Abstract: An alert indicates that a situation conducive to calibrating a barometric pressure sensor of the user device might have occurred. In response, calibration data is collected for calibrating the barometric pressure sensor. The calibration data is used to perform a calibration process and generate a calibration value for the barometric pressure sensor.
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公开(公告)号：US20230152489A1
公开(公告)日：2023-05-18
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：US20230026200A1
公开(公告)日：2023-01-26
申请号：US17938312
申请日：2022-10-05
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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10.发明申请公开(公告)号：US20210345073A1
公开(公告)日：2021-11-04
申请号：US17305623
申请日：2021-07-12
Applicant: NextNav, LLC
Inventor： Michael DORMODY , Arun RAGHUPATHY , Badrinath NAGARAJAN , Guiyuan HAN
Abstract: Using a pressure sensor of a mobile device to improve the 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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