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公开(公告)号：US10551271B2
公开(公告)日：2020-02-04
申请号：US15288274
申请日：2016-10-07
Applicant: NextNav, LLC
Inventor： Michael Dormody , Thomas Wolf
Abstract: Using a calibration sensor to calibrate an unstable sensor from a network of unstable sensors. Approaches for using a calibration sensor to calibrate the unstable sensor initially identify an unstable sensor in a geographic region to be calibrated by a calibration sensor using a model of environmental conditions for the geographic region, and then use the model to determine how to calibrate the unstable sensor using the calibration sensor.
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公开(公告)号：US10288424B2
公开(公告)日：2019-05-14
申请号：US15466704
申请日：2017-03-22
Applicant: NextNav, LLC
Inventor： Michael Dormody , Thomas Wolf , Arun Raghupathy , Andrew Sendonaris
Abstract: Improving an estimated altitude of a receiver by mitigating the effects of transmitter heating. Systems and methods for improving estimates of a receiver's altitude determine a reference pressure at a reference altitude using a temperature measured at a transmitter or another temperature value, an altitude of the transmitter, and a pressure measured by the transmitter or another pressure value. A local reference pressure for a receiver is determined using the reference pressure and other reference pressures from other transmitters. Reference pressures from overheating transmitters may be weighted less than reference pressures from other transmitters when determining the local reference pressure. The local reference pressure is then used to estimate the altitude of the receiver.
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23.发明授权公开(公告)号：US12298196B2
公开(公告)日：2025-05-13
申请号：US18342536
申请日：2023-06-27
Applicant: NextNav, LLC
Inventor： Michael Dormody , Guiyuan Han , Badrinath Nagarajan
Abstract: A method involves determining weighted metric values for each metric of a plurality of metrics by applying a weight for each metric to a determined value of each metric. The method further involves using the weighted metric values to determine if a pressure sensor of a mobile device should be calibrated using information associated with the first location, and if a determination is made that the pressure sensor of the mobile device should be calibrated using information associated with the first location, then using the information associated with the first location to calibrate the pressure sensor of the mobile device.
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公开(公告)号：US12130968B2
公开(公告)日：2024-10-29
申请号：US18304215
申请日：2023-04-20
Applicant: NextNav, LLC
Inventor： Michael Dormody , Arun Raghupathy , Badrinath Nagarajan , Guiyuan Han
IPC: G06F3/01 , G01P15/02 , G06F3/041 , H04M1/72403 , H04M1/72454 , H04M1/72457 , 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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公开(公告)号：US11913809B2
公开(公告)日：2024-02-27
申请号：US17938312
申请日：2022-10-05
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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Patent Agency Ranking
公开(公告)号：US11740081B2
公开(公告)日：2023-08-29
申请号：US17456008
申请日：2021-11-22
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：US11722593B2
公开(公告)日：2023-08-08
申请号：US17457340
申请日：2021-12-02
Applicant: NextNav, LLC
Inventor： William Alberth , Michael Dormody
IPC: H04M1/725 , H04W4/029 , H04W4/16 , H04M1/72454
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：US11460298B2
公开(公告)日：2022-10-04
申请号：US16364827
申请日：2019-03-26
Applicant: NextNav, LLC
Inventor： Guiyuan Han , Badrinath Nagarajan , Michael Dormody
Abstract: Estimating a difference in height between two floors in a building for use in estimating a height or an altitude of one of the two floors. Particular embodiments estimate a height difference between a first floor and a second floor based on a first outdoor temperature of a first time period, a second outdoor temperature of a second time period, a third temperature that is based on an indoor temperature of the first time period or the second time period, a first estimated difference in height between the first and second floors that is based on measurements of pressure from mobile devices when those mobile devices were on the first and second floors during the first time period, and a second estimated difference in height between the first and second floors that is based on measurements of pressure from mobile devices when those mobile devices were on the first and second floors during the second time period.
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公开(公告)号：US11204646B2
公开(公告)日：2021-12-21
申请号：US15930304
申请日：2020-05-12
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
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 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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公开(公告)号：US10677880B2
公开(公告)日：2020-06-09
申请号：US16456200
申请日：2019-06-28
Applicant: NextNav, LLC
Inventor： Michael Dormody , Thomas Wolf
Abstract: Using atmospheric data from one or more reference nodes to estimate an altitude of a receiver. Assistance data associated with a set of reference nodes within a region is identified, and the assistance data is used to identify atmospheric reference data associated with a subset of selected reference nodes. An estimate of the receiver's altitude is generated using the atmospheric reference data from the subset of reference nodes.
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