-
公开(公告)号：US11841285B2
公开(公告)日：2023-12-12
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.
-
公开(公告)号：US11761765B2
公开(公告)日：2023-09-19
申请号：US17647826
申请日：2022-01-12
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 incudes determining an absolute calibration value used to calibrate pressure measurements by a pressure sensor of a mobile device; determining a first revisit zone as a first location to which the mobile device repeatedly returns; determining first and second calibrations for first and second visits to the first revisit zone; determining a first relative calibration adjustment value based on a difference between the first and second calibrations; determining an adjusted absolute calibration value based on a sum of the absolute calibration value and the first relative calibration adjustment value; and estimating an altitude of the mobile device based on a pressure measurement by the pressure sensor and the adjusted absolute calibration value.
-
33.发明授权公开(公告)号：US11733119B2
公开(公告)日：2023-08-22
申请号：US17443135
申请日：2021-07-21
Applicant: NextNav, LLC
Inventor： Michael Dormody , Guiyuan Han , Badrinath Nagarajan
CPC classification number: G01L27/005 , G01L19/00 , G01C21/206
Abstract: Determining when to calibrate a pressure sensor of a mobile device. Particular systems and methods determine values of a plurality of metrics, determine weights for the metric values, determine weighted metric values by applying the weights to the metric values, use the weighted metric values to determine if a pressure sensor of the mobile device should be calibrated using information associated with the first location, and calibrate the pressure sensor of the mobile device using the information associated with the first location if a determination is made that the pressure sensor of the mobile device should be calibrated using information associated with the first location.
-
Patent Agency Ranking
公开(公告)号：US11418914B2
公开(公告)日：2022-08-16
申请号：US17303686
申请日：2021-06-04
Applicant: NextNav, LLC
Inventor： Michael Dormody , Badrinath Nagarajan , Guiyuan Han , Arun Raghupathy
Abstract: A method involves determining, at a mobile device or a service, an uncertainty in height above a reference altitude, an estimated 2D position of the mobile device, and an uncertainty in terrain height above the reference altitude using the estimated 2D position. An uncertainty in height above terrain, of the mobile device, is determined at the mobile device or a server using the uncertainty in height above the reference altitude and the uncertainty in terrain height above the reference altitude.
-
公开(公告)号：US11215453B2
公开(公告)日：2022-01-04
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.
-
公开(公告)号：US11181365B2
公开(公告)日：2021-11-23
申请号：US16364741
申请日：2019-03-26
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.
-
公开(公告)号：US10704905B2
公开(公告)日：2020-07-07
申请号：US15676454
申请日：2017-08-14
Applicant: NextNav, LLC
Inventor： Michael Dormody , Badrinath Nagarajan , Guiyuan Han
Abstract: Identifying and estimating values of atmospheric conditions for use in estimating an altitude of a mobile device. Systems and methods for monitoring one or more conditions before estimating an altitude of a mobile device may receive a reference pressure that was computed using a measurement of pressure from a first reference pressure sensor at a first location, wherein the received reference pressure specifies an estimated pressure for a reference altitude, and determine if a threshold change in measured pressure by the first reference pressure sensor is detected. If the threshold change in measured pressure is detected, the systems and methods may compute a calibration value for the first reference pressure sensor, or if the threshold change in measured pressure is not detected, the systems and methods may identify a previously-determined calibration value. The systems and methods may then compute an adjusted reference pressure using the received reference pressure and either the computed calibration value or the previously-determined calibration value, and compute an estimate of the altitude of the mobile device using the adjusted reference pressure and a measurement of pressure from the mobile device.
-
公开(公告)号：US10477358B1
公开(公告)日：2019-11-12
申请号：US16364676
申请日：2019-03-26
Applicant: NextNav, LLC
Inventor： Michael Dormody , Guiyuan Han , Badrinath Nagarajan
Abstract: Determining whether a mobile device is inside an environment experiencing adverse pressure variation conditions. Particular systems and methods for determining whether a mobile device is inside an environment experiencing adverse pressure variation conditions detect a change in pressure measured by a mobile device that is caused by an HVAC effect of a building or a vehicle, determine a likelihood that the mobile device is inside a building based on an estimated position of the mobile device relative to the building, and determine that the mobile device is inside the building or inside a vehicle based on the likelihood that the mobile device is inside the building.
-
-
-
-
-
-
-
Search Results
38
records
(took 0.019 seconds)
