公开(公告)号：US10386448B2

公开(公告)日：2019-08-20

申请号：US15238302

申请日：2016-08-16

Applicant: NextNav, LLC

Inventor： Thomas Wolf ,  Michael Dormody

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：US09810788B2

公开(公告)日：2017-11-07

申请号：US14696457

申请日：2015-04-26

Applicant: NextNav, LLC

Inventor： Arun Raghupathy ,  Subramanian S. Meiyappan ,  Thomas Wolf

IPC: G01S19/06 ,  G01S5/02 ,  G01S5/14 ,  G01S19/10 ,  G01S19/46 ,  G01C5/06

CPC classification number: G01S19/06 ,  G01C5/06 ,  G01S5/021 ,  G01S5/14 ,  G01S5/145 ,  G01S19/10 ,  G01S19/46

Abstract: Positioning systems and methods for estimating an altitude of a receiver. In some embodiments, pressure and temperature information from a network of sensors is received by the receiver, and the pressure and temperature information from the network of sensors is used along with pressure information measured at a position of the receiver to estimate the altitude of the receiver.

公开(公告)号：US20150127287A1

公开(公告)日：2015-05-07

申请号：US14527041

申请日：2014-10-29

Applicant: NextNav, LLC

Inventor： Thomas Wolf ,  Michael Dormody

IPC: G01L27/00 ,  G01K19/00

CPC classification number: G01L27/005 ,  G01C5/06 ,  G01K19/00 ,  G01L27/002

Abstract: Systems and methods for calibrating individual pressure sensors using mathematical models to compensate for inaccurate measurements of pressure from those pressure sensors are described. Also described are systems and methods for applying those mathematical models to adjust measurements from those pressure sensors during position computations.

Abstract translation: 描述了使用数学模型来校准各个压力传感器的系统和方法，以补偿来自这些压力传感器的压力的不精确测量。 还描述了用于在位置计算期间应用这些数学模型来调整来自这些压力传感器的测量的系统和方法。

公开(公告)号：US11892295B2

公开(公告)日：2024-02-06

申请号：US17644029

申请日：2021-12-13

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 ,  G01C5/06 ,  G01C21/16 ,  G01S19/14 ,  G01C21/10 ,  G01S5/02 ,  G01S19/40 ,  G01S5/00

CPC classification number: G01C17/38 ,  G01C5/06 ,  G01C21/10 ,  G01C21/165 ,  G01C25/00 ,  G01C25/005 ,  G01S19/14 ,  G01S5/012 ,  G01S5/017 ,  G01S5/02 ,  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：US10551271B2

公开(公告)日：2020-02-04

申请号：US15288274

申请日：2016-10-07

Applicant: NextNav, LLC

Inventor： Michael Dormody ,  Thomas Wolf

IPC: G01L27/02 ,  G01L27/00

Abstract: Using a calibration sensor to calibrate an unstable sensor from a network of unstable sensors. Approaches for using a calibration sensor to calibrate the unstable sensor initially identify an unstable sensor in a geographic region to be calibrated by a calibration sensor using a model of environmental conditions for the geographic region, and then use the model to determine how to calibrate the unstable sensor using the calibration sensor.

公开(公告)号：US10288424B2

公开(公告)日：2019-05-14

申请号：US15466704

申请日：2017-03-22

Applicant: NextNav, LLC

Inventor： Michael Dormody ,  Thomas Wolf ,  Arun Raghupathy ,  Andrew Sendonaris

IPC: 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.

公开(公告)号：US20150233713A1

公开(公告)日：2015-08-20

申请号：US14618137

申请日：2015-02-10

Applicant: NextNav, LLC

Inventor： Thomas Wolf

IPC: G01C5/06 ,  G01K13/00 ,  G01N19/10

CPC classification number: G01C5/06 ,  G01K13/00 ,  G01N19/10

Abstract: Described are methods, systems, means and machine-readable media embodying program instructions for considering water molecules and other mixtures in air when estimating an altitude of a pressure sensor. In at least one implementation, a measurement of humidity is used to compute a gas constant value, and the computed gas constant value is used to estimate an altitude of a pressure sensor. In another embodiment, the measurement of humidity is compared to a threshold condition related to humidity. Depending on the results of the comparison, the measurement of humidity is used to determine the altitude of the pressure sensor.

Abstract translation: 描述了在估计压力传感器的高度时体现用于考虑水分子和空气中的其它混合物的程序指令的方法，系统，装置和机器可读介质。 在至少一个实施例中，使用湿度测量来计算气体常数值，并且使用所计算的气体常数值来估计压力传感器的高度。 在另一个实施例中，将湿度测量与与湿度相关的阈值条件进行比较。 根据比较结果，使用湿度测量来确定压力传感器的高度。

公开(公告)号：US20140039823A1

公开(公告)日：2014-02-06

申请号：US14029682

申请日：2013-09-17

Applicant: NextNav, LLC

Inventor： Arun Raghupathy ,  Subramanian S. Meiyappan ,  Thomas Wolf

IPC: G01C5/06

CPC classification number: G01S19/06 ,  G01C5/06 ,  G01S5/021 ,  G01S5/14 ,  G01S5/145 ,  G01S19/10 ,  G01S19/46

Abstract: Positioning systems and methods comprise a network of transmitters that broadcast positioning signals comprising ranging signals and positioning system information. A ranging signal comprises information used to measure a distance to a transmitter broadcasting the ranging signal. A reference sensor array comprising at least one reference sensor unit is positioned at a known location. A remote receiver includes an atmospheric sensor collecting atmospheric data at a position of the remote receiver. A positioning application is coupled to the remote receiver and generates a reference pressure estimate at the position of the remote receiver using the atmospheric and reference data from the reference sensor array. The positioning application computes the position of the remote receiver using the reference pressure estimate and information derived from at least one of the positioning signals and satellite signals that are signals of a satellite-based positioning system. The position includes an elevation.

Abstract translation: 定位系统和方法包括广播包括测距信号和定位系统信息的定位信号的发射机网络。 测距信号包括用于测量到广播测距信号的发射机的距离的信息。 包括至少一个参考传感器单元的参考传感器阵列位于已知位置。 远程接收器包括在远程接收器的位置处收集大气数据的大气传感器。 定位应用耦合到远程接收器，并使用来自参考传感器阵列的大气和参考数据在远程接收器的位置处产生参考压力估计。 定位应用使用参考压力估计和从作为基于卫星的定位系统的信号的定位信号和卫星信号中的至少一个导出的信息来计算远程接收机的位置。 位置包括一个高程。