公开(公告)号：US20210164779A1

公开(公告)日：2021-06-03

申请号：US17248913

申请日：2021-02-12

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Guiyuan HAN ,  Badrinath NAGARAJAN

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

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：US20240118081A1

公开(公告)日：2024-04-11

申请号：US18539991

申请日：2023-12-14

Applicant: NextNav, LLC

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

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

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

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：US20230273049A1

公开(公告)日：2023-08-31

申请号：US17823135

申请日：2022-08-30

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Arun RAGHUPATHY ,  Badrinath NAGARAJAN ,  Frank Yenshaw ,  Deepak Joseph

IPC: G01C25/00 ,  G01C5/06

CPC classification number: G01C25/00 ,  G01C5/06

Abstract: Device-based barometric pressure sensor calibration involves determining a specific location of the mobile device; determining a general location of the mobile device that encompasses and obfuscates the specific location; transmitting the general location to a server; receiving general calibration data for the general location; determining specific calibration data based on the general calibration data and the specific location; determining a calibration value based on the specific calibration data, the calibration value being for calibrating the barometric pressure sensor.

公开(公告)号：US20230113234A1

公开(公告)日：2023-04-13

申请号：US18058421

申请日：2022-11-23

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Badrinath NAGARAJAN ,  Guiyuan HAN

IPC: G01C5/06 ,  G01L27/00

Abstract: Pressure-based estimation of a mobile device altitude or calibration of a pressure sensor involves machines that determine if a reference-level pressure value based on one or more measurements of pressure from a network of weather stations should or should not be used to calibrate a pressure sensor of a mobile device or to estimate an altitude of the mobile device. If the reference-level pressure value should be used, the reference-level pressure value is used to calibrate a pressure sensor of a mobile device or to estimate an altitude of the mobile device. If the reference-level pressure value should not be used, a trend in pressure is determined, an estimated reference-level pressure value based on the trend is determined, and the estimated reference-level pressure value is used to calibrate a pressure sensor of a mobile device or to estimate an altitude of the mobile device.

公开(公告)号：US20220377499A1

公开(公告)日：2022-11-24

申请号：US17816306

申请日：2022-07-29

Applicant: NextNav, LLC

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

IPC: H04W4/02 ,  G01S19/51 ,  G01C5/00

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：US20220155067A1

公开(公告)日：2022-05-19

申请号：US17649746

申请日：2022-02-02

Applicant: NextNav, LLC

Inventor： Badrinath NAGARAJAN ,  Guiyuan HAN ,  Michael DORMODY

IPC: G01C5/06 ,  G01C21/20

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.

公开(公告)号：US20220103677A1

公开(公告)日：2022-03-31

申请号：US17457340

申请日：2021-12-02

Applicant: NextNav, LLC

Inventor： William ALBERTH ,  Michael DORMODY

IPC: H04M1/72454 ,  H04W4/029 ,  H04W4/16

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.

公开(公告)号：US20210392457A1

公开(公告)日：2021-12-16

申请号：US17303686

申请日：2021-06-04

Applicant: NextNav, LLC

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

IPC: H04W4/02 ,  G01C5/00 ,  G01S19/51

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：US20190317179A1

公开(公告)日：2019-10-17

申请号：US16456200

申请日：2019-06-28

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Thomas WOLF

IPC: G01S5/02 ,  G01C5/06 ,  G01S19/45

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.

公开(公告)号：US20190226842A1

公开(公告)日：2019-07-25

申请号：US16372638

申请日：2019-04-02

Applicant: NextNav, LLC

Inventor： Michael DORMODY ,  Thomas WOLF ,  Arun RAGHUPATHY ,  Andrew SENDONARIS

IPC: G01C5/06 ,  H04W64/00

CPC classification number: G01C5/06 ,  H04W64/00

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.