公开(公告)号：US11047991B2

公开(公告)日：2021-06-29

申请号：US16703220

申请日：2019-12-04

申请人： NextNav, LLC

发明人： Arun Raghupathy ,  Norman F. Krasner

IPC分类号： G01S19/11 ,  G01S19/45 ,  H04W64/00 ,  G01S19/48 ,  H04B1/709

摘要： Embodiments describe determining position by selecting a set of digital pseudorandom sequences. The magnitudes of the cross-correlation between any two sequences of the chosen set are below a specified threshold. A subset of digital pseudorandom sequences are selected from the set such that the magnitudes of the autocorrelation function of each member of the subset, within a specified region adjacent to the peak of the autocorrelation function, are equal to or less than a prescribed value. Each transmitter transmits a positioning signal, and at least a portion of the positioning signal is modulated with at least one member of the subset. At least two transmitters of the plurality of transmitters modulate respective positioning signals with different members of the subset of digital pseudorandom sequences.

公开(公告)号：US10993204B2

公开(公告)日：2021-04-27

申请号：US16862426

申请日：2020-04-29

申请人： NextNav, LLC

发明人： Ganesh Pattabiraman ,  Deepak Joseph

IPC分类号： H04W64/00 ,  H04B7/0413 ,  H04B7/0452 ,  H04B7/06 ,  H04W52/02 ,  H04W4/029 ,  G01S5/02 ,  H04W4/021

摘要： Determining if a receiver is inside or outside a building or area. Particular systems and methods for determining if a receiver is inside or outside a building determine an estimate of a position of a receiver, and use the estimate of the position of the receiver and other data to determine if the position of the receiver is inside a first building. The other data may include locations of geo-fences inside buildings, heights of buildings, or other types of data.

公开(公告)号：US20210006951A1

公开(公告)日：2021-01-07

申请号：US15930289

申请日：2020-05-12

申请人： NextNav, LLC

发明人： MICHAEL DORMODY ,  ARUN RAGHUPATHY ,  BADRINATH NAGARAJAN ,  GUIYUAN HAN

IPC分类号： H04W4/38 ,  H04W4/029 ,  H04W4/02 ,  H04W64/00

摘要： Using a pressure sensor of a mobile device to improve the reliability of determined contexts. Particular embodiments described herein include machines that determine a context of a mobile device, and determine if the determined context is accurate using one or more measurements of pressure from a pressure sensor of the mobile device.

公开(公告)号：US10598758B2

公开(公告)日：2020-03-24

申请号：US15706076

申请日：2017-09-15

申请人： NextNav, LLC

发明人： Arun Raghupathy ,  Andrew Sendonaris ,  Norman F. Krasner

IPC分类号： G01S5/02 ,  G01S19/11 ,  G01S1/04 ,  G01S19/46 ,  H04W64/00

摘要： Devices, systems, and methods for sending positional information from transmitters/beacons. In one implementation a transmitter generates a range block including a ranging signal and a hybrid block including positioning data, and sends the range block and hybrid block at different times. A user device may receive signals from a plurality of transmitters and generates position/location information using trilateration and measured altitude information in comparison with transmitter altitude information.

公开(公告)号：US10514258B2

公开(公告)日：2019-12-24

申请号：US15692142

申请日：2017-08-31

申请人： NextNav, LLC

发明人： Michael Dormody ,  Ganesh Pattabiraman ,  Abijith Kumar ,  Thomas Wolf ,  Gary Parsons ,  Christian Gates ,  Deepak Joseph ,  Badrinath Nagarajan

IPC分类号： G01C17/38 ,  G01C21/10 ,  G01C25/00 ,  G01C5/06 ,  G01C21/16 ,  G01S5/02 ,  G01S19/14 ,  G01S19/40

摘要： 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：US10444369B2

公开(公告)日：2019-10-15

申请号：US15283819

申请日：2016-10-03

申请人： NextNav, LLC

发明人： Arun Raghupathy ,  Chen Meng ,  Norman F. Krasner ,  Sameet Deshpande

IPC分类号： G01S19/11 ,  H04J13/00 ,  H04J13/14 ,  G01S19/25

摘要： Generating signals from non-GNSS transmitters, and processing the signals using a GNSS positioning module. Systems and methods identify a chipping rate, identify a PN code length, generate a PN code that has a length equal to the identified PN code length, generate a positioning signal using the identified chipping rate and the generated PN code, and transmit the positioning signal from the transmitter. The PN code length may produce, at the identified chipping rate, a PN code duration that is equal to or is a multiple of a PN code duration used in a GNSS system, the identified chipping rate may be equal to or a multiple of a chipping rate used in a GNSS system, and the identified PN code length may be equal to or a multiple of a PN code length used in a GNSS system.

公开(公告)号：US20190141635A1

公开(公告)日：2019-05-09

申请号：US16220873

申请日：2018-12-14

申请人： NextNav, LLC

发明人： ARUN RAGHUPATHY ,  SUBRAMANIAN S. MEIYAPPAN

IPC分类号： H04W52/02 ,  G01S5/10 ,  H04B17/373 ,  G01S5/02

CPC分类号： H04W52/0245 ,  G01S5/0221 ,  G01S5/0236 ,  G01S5/10 ,  G01S5/14 ,  H04B7/2643 ,  H04B17/318 ,  H04B17/373 ,  H04W52/0254 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/164 ,  Y02D70/449

摘要： Reducing power consumption of a receiver in association with estimating the receiver's position using ranging signals. Systems and methods may determine power reduction strategy information, identify a power reduction strategy using the determined power reduction strategy information, and place one or more modules of the receiver into a reduced power state using the identified power reduction strategy. The power reduction strategy may result in powering off different circuitry of the receiver at different times, and under different circumstances.

公开(公告)号：US10203397B2

公开(公告)日：2019-02-12

申请号：US14207351

申请日：2014-03-12

申请人： NextNav, LLC

发明人： Andrew Sendonaris ,  Norman F. Krasner ,  Jagadish Venkataraman ,  Chen Meng

IPC分类号： G01S1/02 ,  G01S1/04 ,  G01S5/02 ,  G01S19/22

摘要： Devices, systems, and methods for improving performance in positioning systems. Performance may be improved using disclosed signal processing methods for separating eigenvalues corresponding to noise and eigenvalues corresponding to one or more direct path signal components or multipath signal components.

公开(公告)号：US10175945B2

公开(公告)日：2019-01-08

申请号：US15491653

申请日：2017-04-19

申请人： NextNav, LLC

发明人： Vikram V. Kalkunte ,  Subramanian S. Meiyappan

IPC分类号： H04B1/00 ,  G06F7/52 ,  H04B1/7075

摘要： Systems and methods for improving correlation. In at least one system and method, a signal is received and divided into a plurality of slices. Each of the slices is divided into a plurality of sub-slices. A plurality of chips of a PN code are generated, and sub-slice correlation results are generated in parallel. Summation of the sub-slice correlation results generates a slice correlation results, and the accumulated slice correlation results provide a correlation result.

公开(公告)号：US10064017B2

公开(公告)日：2018-08-28

申请号：US15487215

申请日：2017-04-13

申请人： NextNav, LLC

发明人： Guiyuan Han ,  Michael Dormody ,  Thomas Wolf ,  Ganesh Pattabiraman

IPC分类号： H04W4/04 ,  G01W1/06 ,  G01C5/00

CPC分类号： G01C5/00 ,  F24F11/62 ,  F24F2110/10 ,  F24F2110/40 ,  F24F2221/50 ,  G01C5/06 ,  G01W1/06 ,  H04W4/30 ,  H04W4/33

摘要： Determining building weather profile parameters, and correcting an estimated altitude of a receiver using the building weather profile parameters. Systems and methods for estimating an altitude of a receiver using building weather profile parameters may identify one or more weather profile parameters for a building, determine an initial estimate of a receiver's altitude at a floor inside the building, and use the initial estimate and the identified weather profile parameters to determine a corrected estimate of the receiver's altitude at the floor.