Inventor

NAGARAJAN BADRINATH

US48 patents

Patents

48 patents

US11199406B2Dec 14, 2021

Systems and methods for calibrating unstable sensors

NEXTNAV LLC14 citations93

US10514258B2Dec 24, 2019

Systems and methods for calibrating unstable sensors

NEXTNAV LLC18 citations93

US11555699B2Jan 17, 2023

Systems and methods for determining when an estimated altitude of a mobile device can be used for calibration or location determination

NEXTNAV LLC7 citations86

US11215453B2Jan 4, 2022

Floor height estimation and calibration of a mobile device

NEXTNAV LLC7 citations86

US11333567B2May 17, 2022

Constraining barometric pressure sensor calibration with sporadic data collection

NEXTNAV LLC5 citations84

US10704905B2Jul 7, 2020

Systems and methods for determining a reference pressure for use in estimating an altitude of a mobile device

NEXTNAV LLC6 citations84

US12130155B2Oct 29, 2024

Systems and methods for determining calibration values for atmospheric sensors that provide measured pressures used for estimating altitudes of mobile devices

NEXTNAV LLC1 citations73

US11913809B2Feb 27, 2024

Systems and methods for extending the spatial coverage of a reference pressure network

NEXTNAV LLC1 citations73

US11841285B2Dec 12, 2023

Constraining barometric pressure sensor calibration with sporadic data collection

NEXTNAV LLC2 citations73

US11808608B2Nov 7, 2023

Systems and methods for extending the spatial coverage of a reference pressure network

NEXTNAV LLC1 citations73

US11761765B2Sep 19, 2023

Calibrating a pressure sensor

NEXTNAV LLC3 citations73

US11733119B2Aug 22, 2023

Systems and methods for determining when to calibrate a pressure sensor of a mobile device

NEXTNAV LLC1 citations73

US11674798B2Jun 13, 2023

Systems and methods for determining calibration values for atmospheric sensors that provide measured pressures used for estimating altitudes of mobile devices

NEXTNAV LLC3 citations73

US11669170B2Jun 6, 2023

Systems and methods for determining contexts of mobile devices

NEXTNAV LLC2 citations73

US11579036B2Feb 14, 2023

Constraining barometric pressure sensor calibration with sporadic data collection

NEXTNAV LLC1 citations73

US11536564B2Dec 27, 2022

Systems and methods for pressure-based estimation of a mobile device altitude or calibration of a pressure sensor

NEXTNAV LLC5 citations73

US11460298B2Oct 4, 2022

Systems and methods for estimating a difference in height between two floors in a building for use in estimating a height or an altitude of one of the two floors

NEXTNAV LLC2 citations73

US11243076B2Feb 8, 2022

Systems and methods for extending the spatial coverage of a reference pressure network

NEXTNAV LLC1 citations73

US11073441B2Jul 27, 2021

Systems and methods for determining when to calibrate a pressure sensor of a mobile device

NEXTNAV LLC4 citations73

US11064320B2Jul 13, 2021

Systems and methods for using a pressure sensor of a mobile device to improve the reliability of determined contexts

NEXTNAV LLC2 citations73

US10921121B2Feb 16, 2021

Systems and methods for determining calibration values for atmospheric sensors that provide measured pressures used for estimating altitudes of mobile devices

NEXTNAV LLC4 citations73

US10602476B2Mar 24, 2020

Systems and methods for determining an indoor or outdoor location of a mobile device

NEXTNAV LLC3 citations73

US10477358B1Nov 12, 2019

Systems and methods for determining whether a mobile device is inside an environment experiencing adverse pressure variation conditions

NEXTNAV LLC6 citations73

US10378894B2Aug 13, 2019

Systems and methods for estimating and altitude of a mobile device based on detected temperature conditions

NEXTNAV LLC2 citations73

US11892295B2Feb 6, 2024

Systems and methods for calibrating unstable sensors

NEXTNAV LLC1 citations72

US12553716B2Feb 17, 2026

Systems and methods for determining when an estimated altitude of a mobile device can be used for calibration or location determination

NEXTNAV LLC0 citations62

US12498219B2Dec 16, 2025

Systems and methods for extending the spatial coverage of a reference pressure network

NEXTNAV LLC0 citations62

US12405110B2Sep 2, 2025

Systems and methods for pressure-based estimation of a mobile device altitude or calibration of a pressure sensor

NEXTNAV LLC0 citations62

US12298196B2May 13, 2025

Systems and methods for determining when to calibrate a pressure sensor of a mobile device

NEXTNAV LLC0 citations62

US12209924B2Jan 28, 2025

Constraining barometric pressure sensor calibration with sporadic data collection

NEXTNAV LLC0 citations62

US12130968B2Oct 29, 2024

Systems and methods for estimating a difference in height between two floors in a building for use in estimating a height or an altitude of one of the two floors

NEXTNAV LLC1 citations62

US11991605B2May 21, 2024

Methods for using a pressure sensor of a mobile device to improve the accuracy of determined contexts

NEXTNAV LLC1 citations62

US11740081B2Aug 29, 2023

Systems and methods for determining which reference-level pressures are used when estimating an altitude of a mobile device

NEXTNAV LLC1 citations62

US11733038B2Aug 22, 2023

Floor height estimation and calibration of a mobile device

NEXTNAV LLC1 citations62

US11418914B2Aug 16, 2022

Characterizing height above terrain confidence

NEXTNAV LLC1 citations62

US11255665B2Feb 22, 2022

Systems and methods for determining where to place atmospheric sensors used to estimate an altitude of a mobile device in an environment

NEXTNAV LLC1 citations62

US11204646B2Dec 21, 2021

Systems and methods for determining contexts of mobile devices

NEXTNAV LLC1 citations62

US11181365B2Nov 23, 2021

Systems and methods for determining which reference-level pressures are used when estimating an altitude of a mobile device

NEXTNAV LLC1 citations62

US12228402B2Feb 18, 2025

Systems and methods for calibrating unstable sensors

NEXTNAV LLC0 citations61

US12560437B2Feb 24, 2026

Estimating floor numbers and floor labels in a structure

NEXTNAV LLC0 citations52

US12553744B2Feb 17, 2026

Identifying erroneous calibration values of barometric air pressure sensor

NEXTNAV LLC0 citations52

US11985569B2May 14, 2024

Identifying problematic 2D positions from mobile devices

NEXTNAV LLC0 citations52

US12345546B2Jul 1, 2025

Device based barometric pressure sensor calibration

NEXTNAV LLC0 citations51

US12270967B2Apr 8, 2025

Field calibration of reference weather stations

NEXTNAV LLC0 citations50

NAGARAJAN BADRINATH

Patents

Systems and methods for calibrating unstable sensors

Systems and methods for calibrating unstable sensors

Systems and methods for determining when an estimated altitude of a mobile device can be used for calibration or location determination

Floor height estimation and calibration of a mobile device

Constraining barometric pressure sensor calibration with sporadic data collection

Systems and methods for determining a reference pressure for use in estimating an altitude of a mobile device

Systems and methods for determining calibration values for atmospheric sensors that provide measured pressures used for estimating altitudes of mobile devices

Systems and methods for extending the spatial coverage of a reference pressure network

Constraining barometric pressure sensor calibration with sporadic data collection

Systems and methods for extending the spatial coverage of a reference pressure network

Calibrating a pressure sensor

Systems and methods for determining when to calibrate a pressure sensor of a mobile device

Systems and methods for determining calibration values for atmospheric sensors that provide measured pressures used for estimating altitudes of mobile devices

Systems and methods for determining contexts of mobile devices

Constraining barometric pressure sensor calibration with sporadic data collection

Systems and methods for pressure-based estimation of a mobile device altitude or calibration of a pressure sensor

Systems and methods for estimating a difference in height between two floors in a building for use in estimating a height or an altitude of one of the two floors

Systems and methods for extending the spatial coverage of a reference pressure network

Systems and methods for determining when to calibrate a pressure sensor of a mobile device

Systems and methods for using a pressure sensor of a mobile device to improve the reliability of determined contexts

Systems and methods for determining calibration values for atmospheric sensors that provide measured pressures used for estimating altitudes of mobile devices

Systems and methods for determining an indoor or outdoor location of a mobile device

Systems and methods for determining whether a mobile device is inside an environment experiencing adverse pressure variation conditions

Systems and methods for estimating and altitude of a mobile device based on detected temperature conditions

Systems and methods for calibrating unstable sensors

Systems and methods for determining when an estimated altitude of a mobile device can be used for calibration or location determination

Systems and methods for extending the spatial coverage of a reference pressure network

Systems and methods for pressure-based estimation of a mobile device altitude or calibration of a pressure sensor

Systems and methods for determining when to calibrate a pressure sensor of a mobile device

Constraining barometric pressure sensor calibration with sporadic data collection

Systems and methods for determining contexts of mobile devices

Characterizing height above terrain confidence

Barometric pressure sensor calibration based on activity context

Calibrating a pressure sensor

Systems and methods for estimating a difference in height between two floors in a building for use in estimating a height or an altitude of one of the two floors

Methods for using a pressure sensor of a mobile device to improve the accuracy of determined contexts

Systems and methods for determining which reference-level pressures are used when estimating an altitude of a mobile device

Floor height estimation and calibration of a mobile device

Characterizing height above terrain confidence

Systems and methods for determining where to place atmospheric sensors used to estimate an altitude of a mobile device in an environment

Systems and methods for determining contexts of mobile devices

Systems and methods for determining which reference-level pressures are used when estimating an altitude of a mobile device

Systems and methods for calibrating unstable sensors

Estimating floor numbers and floor labels in a structure

Identifying erroneous calibration values of barometric air pressure sensor

Identifying problematic 2D positions from mobile devices

Device based barometric pressure sensor calibration

Field calibration of reference weather stations