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21.发明申请公开(公告)号：US20170195984A1
公开(公告)日：2017-07-06
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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22.发明公开公开(公告)号：US20240159529A1
公开(公告)日：2024-05-16
申请号：US18421777
申请日：2024-01-24
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 are determined using measurements of pressure from the network of reference pressure sensors. A time interval and a plurality of wind speeds and corresponding wind directions are used to determine an adjusted location for each reference pressure sensor of the network. The adjusted location and the reference-level pressure for each reference pressure sensor are used to determine a pressure pattern, which is used to determine a reference-level pressure value for the estimated position of the mobile device. The reference-level pressure value is used for calibrating a pressure sensor of the mobile device, or for estimating an altitude of the mobile device for emergency response or navigation.
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23.发明公开公开(公告)号：US20240069244A1
公开(公告)日：2024-02-29
申请号：US18503561
申请日：2023-11-07
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, 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：US20240060843A1
公开(公告)日：2024-02-22
申请号：US18495124
申请日：2023-10-26
Applicant: NextNav, LLC
Inventor： Michael DORMODY , Guiyuan HAN , Badrinath NAGARAJAN , Arun RAGHUPATHY
CPC classification number: G01L27/002 , G01C5/06
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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25.发明公开公开(公告)号：US20230341286A1
公开(公告)日：2023-10-26
申请号：US18342536
申请日：2023-06-27
Applicant: NextNav, LLC
Inventor： Michael DORMODY , Guiyuan HAN , Badrinath NAGARAJAN
CPC classification number: G01L27/005 , G01L19/00 , G01C21/206
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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Patent Agency Ranking
公开(公告)号：US20230160770A1
公开(公告)日：2023-05-25
申请号：US18157406
申请日：2023-01-20
Applicant: NextNav, LLC
Inventor： Michael DORMODY , Guiyuan HAN , Badrinath NAGARAJAN , Arun RAGHUPATHY
CPC classification number: G01L27/002 , G01C5/06
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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27.发明公开公开(公告)号：US20230152490A1
公开(公告)日：2023-05-18
申请号：US18053907
申请日：2022-11-09
Applicant: NextNav, LLC
Inventor： Badrinath NAGARAJAN , Prashant DAVE , Michael DORMODY , Guiyuan HAN , Wei LIU
Abstract: A method involves determining an estimated position of a mobile device within a region. Atmospheric data measurement stations are identified within the region. A geographical anomaly is identified within the region that physically intervenes between the mobile device and a first atmospheric data measurement station. Based on a positional relationship between the mobile device, the geographical anomaly, and the first atmospheric data measurement station, it is determined that atmospheric pressure measurements collected at the first atmospheric data measurement station should be conditionally used for determining a reference pressure estimate. The reference pressure estimate is determined using a plurality of atmospheric pressure measurements collected at the atmospheric data measurement stations and conditionally using the atmospheric pressure measurements collected at the first atmospheric data measurement station. An estimated altitude of the mobile device is determined using a measurement of atmospheric pressure at the mobile device and the reference pressure estimate.
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公开(公告)号：US20220107690A1
公开(公告)日：2022-04-07
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
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：US20220082381A1
公开(公告)日：2022-03-17
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：US20210156685A1
公开(公告)日：2021-05-27
申请号：US17247011
申请日：2020-11-24
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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