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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
申请人： NextNav, LLC
CPC分类号： G01C5/06 , G01L27/005 , H04W4/029
摘要： 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
申请人： NextNav, LLC
摘要： 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
申请人： NextNav, LLC
CPC分类号： G01C5/06 , G01C21/206
摘要： 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：US20230221144A1
公开(公告)日：2023-07-13
申请号：US18151178
申请日：2023-01-06
申请人： NextNav, LLC
摘要： 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：US11669170B2
公开(公告)日：2023-06-06
申请号：US17644918
申请日：2021-12-17
申请人： NextNav, LLC
IPC分类号： G06F3/01 , H04M1/72457 , H04M1/72403 , H04M1/72454 , G01P15/02 , G06F3/041 , H04N21/45 , H04W4/021
CPC分类号： G06F3/017 , G01P15/02 , G06F3/041 , H04M1/72403 , H04M1/72454 , H04M1/72457 , H04N21/4524 , H04W4/021
摘要： 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：US20230075640A1
公开(公告)日：2023-03-09
申请号：US17447027
申请日：2021-09-07
申请人： NextNav, LLC
摘要： 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：US11579036B2
公开(公告)日：2023-02-14
申请号：US17660011
申请日：2022-04-20
申请人： NextNav, LLC
摘要： 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
申请人： NextNav, LLC
摘要： 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：US20230003520A1
公开(公告)日：2023-01-05
申请号：US17931714
申请日：2022-09-13
申请人： NextNav, LLC
摘要： 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：US11243076B2
公开(公告)日：2022-02-08
申请号：US16380120
申请日：2019-04-10
申请人： NextNav, LLC
摘要： 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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