公开(公告)号：US20170363423A1

公开(公告)日：2017-12-21

申请号：US15692142

申请日：2017-08-31

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Ganesh PATTABIRAMAN ,  Abijith KUMAR ,  Thomas WOLF ,  Gary PARSONS ,  Christian GATES ,  Deepak JOSEPH ,  Badrinath NAGARAJAN

IPC: G01C17/38 ,  G01C25/00 ,  G01C21/10

CPC classification number: G01C17/38 ,  G01C5/06 ,  G01C21/10 ,  G01C21/165 ,  G01C25/00 ,  G01C25/005 ,  G01S5/02 ,  G01S19/14 ,  G01S19/40

Abstract: Calibrating an unstable sensor of a mobile device. Systems and methods for calibrating a sensor of a mobile device determine a first estimated position of the mobile device without using any measurement from the sensor of the mobile device, generate a second estimated position of the mobile device using a measurement from the sensor, estimate a sensor error of the sensor using the first estimated position and the second estimated position, and use the sensor error to determine a calibration value for adjusting one or more measurements from the sensor.

公开(公告)号：US20240426633A1

公开(公告)日：2024-12-26

申请号：US18742241

申请日：2024-06-13

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Wei LIU

IPC: G01C25/00 ,  G01C5/06

Abstract: A method involves measuring atmospheric pressure data using a barometric pressure sensor of a mobile device and determining an estimated position of the mobile device using positioning data. A calibration value for calibrating the barometric pressure sensor of the mobile device is determined using the atmospheric pressure data and added to a set of calibration values. If the estimated position of the mobile device corresponds to a location that has a wide distribution of possible altitudes, an aggregated calibration value overlap region and an aggregated calibration value range are generated using the set of calibration values. A set of validated calibration values are generated by validating the set of calibration values using a previously generated aggregated calibration value overlap region and a previously generated aggregated calibration value range. A combined calibration value is generated using the set of validated calibration values and used to calibrate the barometric pressure sensor.

公开(公告)号：US20240310188A1

公开(公告)日：2024-09-19

申请号：US18599901

申请日：2024-03-08

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Wei LIU

IPC: G01C25/00 ,  G01C5/06

CPC classification number: G01C25/00 ,  G01C5/06

Abstract: Estimated positions of a computing device and whether the computing device is inside a building are determined. Atmospheric pressure measurements are collected when inside the buildings using a barometric pressure sensor of the computing device. Heights of the buildings are determined. Calibration values based on the heights of the buildings and the atmospheric pressure measurements are determined. A combined calibration value is determined based on the plurality of calibration values. The combined calibration value corresponds to a numerical overlap region of the plurality of calibration values.

公开(公告)号：US20230384097A1

公开(公告)日：2023-11-30

申请号：US18363329

申请日：2023-08-01

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Deepak JOSEPH ,  Badrinath NAGARAJAN ,  Guiyuan HAN ,  Arun RAGHUPATHY

IPC: G01C17/38 ,  G01C25/00 ,  G01C5/06 ,  G01S5/02 ,  G01C21/16 ,  G01S19/14 ,  G01C21/10

CPC classification number: G01C17/38 ,  G01C25/00 ,  G01C5/06 ,  G01S5/02 ,  G01C21/165 ,  G01S19/14 ,  G01C21/10 ,  G01C25/005 ,  G01S19/40

Abstract: Calibrating a pressure sensor of a mobile device includes determining a first plurality of calibration values for a first plurality of visits to a first revisit zone to which a mobile device repeatedly returns; determining a first relative calibration adjustment value based on the first plurality of calibration values; determining an adjusted absolute calibration value based on i) an absolute calibration value used to calibrate pressure measurements made by a pressure sensor of the mobile device, and ii) the first relative calibration adjustment value; and calibrating pressure measurements made by the pressure sensor of the mobile device using the adjusted absolute calibration value.

公开(公告)号：US20230266121A1

公开(公告)日：2023-08-24

申请号：US18309199

申请日：2023-04-28

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Guiyuan HAN ,  Badrinath NAGARAJAN

IPC: G01C5/06 ,  H04W4/029 ,  G01L27/00

CPC classification number: G01C5/06 ,  H04W4/029 ,  G01L27/005

Abstract: 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.

公开(公告)号：US20230259216A1

公开(公告)日：2023-08-17

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 ,  H04M1/72457 ,  H04M1/72403 ,  H04M1/72454 ,  G01P15/02 ,  G06F3/041 ,  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.

公开(公告)号：US20230138050A1

公开(公告)日：2023-05-04

申请号：US17452862

申请日：2021-10-29

Applicant: NextNav, LLC

Inventor： Guiyuan HAN ,  Michael DORMODY ,  Badrinath NAGARAJAN ,  Arun RAGHUPATHY

IPC: H04W4/029 ,  H04W4/02 ,  G01C5/06

Abstract: A method to identify a problematic 2D position of a mobile device can include: determining a reported 2D position of the mobile device; determining a piece of information about the mobile device; and comparing the reported 2D position and the piece of information about the mobile device. Upon determining that the reported 2D position and the piece of information about the mobile device are consistent with each other, the reported 2D position of the mobile device is used as an estimate of the actual 2D position of the mobile device, or upon determining that the reported 2D position and the piece of information about the mobile device are not consistent with each other, the reported 2D position is determined to be problematic, and the reported 2D position of the mobile device is removed from a list of reported 2D positions of the mobile device.

公开(公告)号：US20230121848A1

公开(公告)日：2023-04-20

申请号：US18068295

申请日：2022-12-19

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Guiyuan HAN ,  Badrinath NAGARAJAN

IPC: G01C5/00 ,  G06F17/18 ,  G01L27/00 ,  H04W4/029 ,  G01S5/00

Abstract: 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.

公开(公告)号：US20230028950A1

公开(公告)日：2023-01-26

申请号：US17443281

申请日：2021-07-23

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Badrinath NAGARAJAN ,  Arun RAGHUPATHY ,  Guiyuan HAN

IPC: G01C25/00 ,  G01C5/06

Abstract: 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.

公开(公告)号：US20220244126A1

公开(公告)日：2022-08-04

申请号：US17660011

申请日：2022-04-20

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Guiyuan HAN ,  Badrinath NAGARAJAN ,  Arun RAGHUPATHY

IPC: G01L27/00 ,  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.